LS12THAY - v1.0.6

Dataset Id: r86BjdY5rD9VLWWNw0Tm

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L <- lipdR::readLipd("https://lipdverse.org/data/r86BjdY5rD9VLWWNw0Tm/1_0_6/LS12THAY.lpd")

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iso2k-1_1_2

root

archiveType: LakeSediment

originalDataUrl: https://www.ncdc.noaa.gov/paleo/study/13114

lipdVersion: 1.3

dataContributor: EKT

pub
pub1

author: list(name = "Thomas")

doi: 10.1007/s10933-012-9584-7

geo

latitude: 70.459

longitude: -70.086

elevation: 68

siteName: Ayr Lake

PaleoData columns
year (yr AD)

TSid: MAT1f2a2beb33

variableName: year

units: yr AD

description: Year AD

depth (cm)

TSid: LPD32931661

variableName: depth

units: cm

description: bottom depth (mm)

depth (cm)

TSid: MATbc6c134f26

variableName: depth

units: cm

description: depth

d2H (permil)

TSid: LS12THAY01E

variableName: d2H

units: permil

description: terrestrial biomarker

interpretation
1

basis: The remarkable similarity between d2Hwax and regional temperature indicates that d2Hwax is a useful proxy to reconstruct temper- ature at decadal- to sub-centennial-resolution.

direction: positive

interpDirection: positive

scope: climate

seasonality: Summer

seasonalityOriginal: summer

variable: temperature

variableDetail: air@surface

variableDetailOriginal: air

variableGroup: Temperature

variableGroupDirection: negative

variableGroupOriginal: T

2

scope: climate

3

scope: climate

4

basis: The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake.

coefficient: NA

direction: positive

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 1

scope: isotope

seasonality: Growing Season

variable: precipitationIsotope

variableGroup: P_isotope

variableGroupDirection: positive

5

basis: Bottom line: more snowmelt providing source water to plants causes pool of plant source water to be more 2H-depleted. "The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake."

coefficient: NA

direction: negative

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 2

scope: isotope

seasonality: Winter

variable: meltwater

variableGroup: winter snow melting during growing season

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

d2H (permil)

TSid: LS12THAY01B

variableName: d2H

units: permil

description: terrestrial biomarker

interpretation
1

basis: The remarkable similarity between d2Hwax and regional temperature indicates that d2Hwax is a useful proxy to reconstruct temper- ature at decadal- to sub-centennial-resolution.

direction: positive

interpDirection: positive

scope: climate

seasonality: Summer

seasonalityOriginal: summer

variable: temperature

variableDetail: air@surface

variableDetailOriginal: air

variableGroup: Temperature

variableGroupDirection: negative

variableGroupOriginal: T

2

scope: climate

3

scope: climate

4

basis: The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake.

coefficient: NA

direction: positive

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 1

scope: isotope

seasonality: Growing Season

variable: precipitationIsotope

variableGroup: P_isotope

variableGroupDirection: positive

5

basis: Bottom line: more snowmelt providing source water to plants causes pool of plant source water to be more 2H-depleted. "The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake."

coefficient: NA

direction: negative

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 2

scope: isotope

seasonality: Winter

variable: meltwater

variableGroup: winter snow melting during growing season

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

d2H (permil)

TSid: LS12THAY01C

variableName: d2H

units: permil

description: terrestrial biomarker

interpretation
1

basis: The remarkable similarity between d2Hwax and regional temperature indicates that d2Hwax is a useful proxy to reconstruct temper- ature at decadal- to sub-centennial-resolution.

direction: positive

interpDirection: positive

scope: climate

seasonality: Summer

seasonalityOriginal: summer

variable: temperature

variableDetail: air@surface

variableDetailOriginal: air

variableGroup: Temperature

variableGroupDirection: negative

variableGroupOriginal: T

2

scope: climate

3

scope: climate

4

basis: The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake.

coefficient: NA

direction: positive

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 1

scope: isotope

seasonality: Jun-Aug

variable: precipitationIsotope

variableGroup: P_isotope

variableGroupDirection: positive

5

basis: Bottom line: more snowmelt providing source water to plants causes pool of plant source water to be more 2H-depleted. "The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake."

coefficient: NA

direction: negative

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 2

scope: isotope

seasonality: Winter

variable: meltwater

variableGroup: winter snow melting during growing season

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

d2H (permil)

TSid: LS12THAY01D

variableName: d2H

units: permil

description: terrestrial biomarker

interpretation
1

basis: The remarkable similarity between d2Hwax and regional temperature indicates that d2Hwax is a useful proxy to reconstruct temper- ature at decadal- to sub-centennial-resolution.

direction: positive

interpDirection: positive

scope: climate

seasonality: Summer

seasonalityOriginal: summer

variable: temperature

variableDetail: air@surface

variableDetailOriginal: air

variableGroup: Temperature

variableGroupDirection: negative

variableGroupOriginal: T

2

scope: climate

3

scope: climate

4

basis: The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake.

coefficient: NA

direction: positive

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 1

scope: isotope

seasonality: Growing Season

variable: precipitationIsotope

variableGroup: P_isotope

variableGroupDirection: positive

5

basis: Bottom line: more snowmelt providing source water to plants causes pool of plant source water to be more 2H-depleted. "The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake."

coefficient: NA

direction: negative

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 2

scope: isotope

seasonality: Winter

variable: meltwater

variableGroup: winter snow melting during growing season

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

uncertainty (permil)

TSid: LS12THAY0130s

variableName: uncertainty

units: permil

description: stdev of dD of terrestrial biomarker

interpretation
1

scope: climate

2

scope: climate

3

scope: climate

4

coefficient: NA

fraction: NA

rank: NA

scope: isotope

5

coefficient: NA

fraction: NA

rank: NA

scope: isotope

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

uncertainty (permil)

TSid: LS12THAY0124s

variableName: uncertainty

units: permil

description: stdev of dD of terrestrial biomarker

interpretation
1

scope: climate

2

scope: climate

3

scope: climate

4

coefficient: NA

fraction: NA

rank: NA

scope: isotope

5

coefficient: NA

fraction: NA

rank: NA

scope: isotope

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

uncertainty (permil)

TSid: LS12THAY0126s

variableName: uncertainty

units: permil

description: stdev of dD of terrestrial biomarker

interpretation
1

scope: climate

2

scope: climate

3

scope: climate

4

coefficient: NA

fraction: NA

rank: NA

scope: isotope

5

coefficient: NA

fraction: NA

rank: NA

scope: isotope

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

uncertainty (permil)

TSid: LS12THAY0128s

variableName: uncertainty

units: permil

description: stdev of dD of terrestrial biomarker

interpretation
1

scope: climate

2

scope: climate

3

scope: climate

4

coefficient: NA

fraction: NA

rank: NA

scope: isotope

5

coefficient: NA

fraction: NA

rank: NA

scope: isotope

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

d2H (permil)

TSid: LS12THAY01A

variableName: d2H

units: permil

description: terrestrial biomarker

interpretation
1

basis: The remarkable similarity between d2Hwax and regional temperature indicates that d2Hwax is a useful proxy to reconstruct temper- ature at decadal- to sub-centennial-resolution.

interpDirection: positive

scope: climate

seasonality: Summer

seasonalityOriginal: summer

variable: temperature

variableDetail: air@surface

variableDetailOriginal: air

variableGroup: Temperature

variableGroupDirection: negative

variableGroupOriginal: T

2

scope: climate

3

scope: climate

4

basis: The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake.

coefficient: NA

direction: positive

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 1

scope: isotope

seasonality: Growing Season

variable: precipitationIsotope

variableGroup: P_isotope

variableGroupDirection: positive

5

basis: Bottom line: more snowmelt providing source water to plants causes pool of plant source water to be more 2H-depleted. "The major source of water for plants in the Arctic, where permafrost precludes extensive groundwater systems, is precipitation, either as snowmelt or summer rain (Elberling et al. 2008). Thus, we hypothesize that d2Hwax in the Arctic is likely closely related to d2Hprecip. Leaf wax synthesis occurs during the summer months when plants are neither temper- ature- nor light-limited. The apparent fractionation (e) between leaf waxes and source waters varies with relative humidity (RH) and with potential evapotrans- piration (Sachse et al. 2012). Long-term average growing season (June, July, August) RH at Clyde River is 80% (Environment Canada, 2011). The eleven-month dataset from Silasiutitalik at the head of Clyde Inlet suggests that growing season RH is slightly lower inland, around 75% (Kangiqtugaapik (Clyde River) Weather Station Network, 2011). The n-alkanoic acids synthesized by plants that grow at 70?80% RH have an e of -100 to -120% relative to annual mean precipitation (Hou et al. 2008). The d2Hwax values from Ayr Lake sediments (-240 to -265 %) therefore suggest that source water d2H should range between -140 to -165% (assuming an e of -100%) and -120 to -145% (assuming an e of -120%). These calculated source water d2H values are within the range of measured summer d2Hprecip values for both Pond Inlet and Hall Beach, although the values obtained with the larger e are close to the maximum summer d2Hprecip values for Pond Inlet. We therefore hypothesize that plants in this catchment utilize summer precipitation as their main water source (Fig. 2). Variability in summer d2Hprecip, or utilization of small but varying amounts of winter precipitation, is likely driving variability in d2Hwax at Ayr Lake."

coefficient: NA

direction: negative

fraction: NA

inferredMaterial: soil water

integrationTime: 1 to 10

integrationTimeBasis: Leaf wax hydrogen isotopes exhibit a surprising amount of variability at the sub-decadal scale (Fig. 6). This high degree of variability indicates that leaf waxes are likely produced, transported and deposited in a relatively short period of time.

integrationTimeUncertainty: 10

integrationTimeUnits: years

mathematicalRelation: linear

rank: 2

scope: isotope

seasonality: Winter

variable: meltwater

variableGroup: winter snow melting during growing season

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

uncertainty (permil)

TSid: LS12THAY0122s

variableName: uncertainty

units: permil

interpretation
1

scope: climate

2

scope: climate

3

scope: climate

4

coefficient: NA

fraction: NA

rank: NA

scope: isotope

5

coefficient: NA

fraction: NA

rank: NA

scope: isotope

6

coefficient: NA

fraction: NA

rank: NA

scope: isotope

ChronData columns
depth (cm)

TSid: chron1

variableName: depth

units: cm

description: mid-point depth

age14C (yr14C BP)

TSid: chron2

variableName: age14C

units: yr14C BP

description: 14C years before 1950

SD (yr14C BP)

TSid: chron3

variableName: SD

units: yr14C BP

description: 14C years uncertainty

fractionModern ()

TSid: chron4

variableName: fractionModern

description: fraction of modern 14C activity

fractionModernUncertainty ()

TSid: chron5

variableName: fractionModernUncertainty

description: fraction of modern 14C activity uncertainty

delta13C (permil)

TSid: chron6

variableName: delta13C

units: permil

description: delta13C of material analyzed for 14C

delta13Cuncertainty (permil)

TSid: chron7

variableName: delta13Cuncertainty

units: permil

description: delta13C uncertainty

thickness (cm)

TSid: chron8

variableName: thickness

units: cm

description: thickness of sample (along depth axis)

labID ()

TSid: chron9

variableName: labID

description: laboratory ID from radiocarbon facility

materialDated ()

TSid: chron10

variableName: materialDated

description: material analyzed

activity (Bq g-1)

TSid: chron11

variableName: activity

units: Bq g-1

description: 210Pb, 239+240Pu or 137Cs activity

activityUncertainty (Bq g-1)

TSid: chron12

variableName: activityUncertainty

units: Bq g-1

description: 210Pb, 239+240Pu or 137Cs activity uncertainty

supportedActivity ()

TSid: chron13

variableName: supportedActivity

description: Y if supported 210Pb activity, N if unsupported 210Pb activity

x210PbModel ()

TSid: chron14

variableName: x210PbModel

description: model used to convert 210Pb activity to age (e.g., constant rate of supply)

age (yr BP)

TSid: chron15

variableName: age

units: yr BP

description: years before 1950 (calibrated age, or ages that dont need calibration)

SD (yr BP)

TSid: chron16

variableName: SD

units: yr BP

description: uncertainty in age

reservoirAge14C (yr14C BP)

TSid: chron17

variableName: reservoirAge14C

units: yr14C BP

description: 14C reservoir age

reservoirAge14CUncertainty (yr14C BP)

TSid: chron18

variableName: reservoirAge14CUncertainty

units: yr14C BP

description: 14C reservoir age uncertainty

useInAgeModel ()

TSid: chron19

variableName: useInAgeModel

description: was this date used in the age model?