Robust global ocean cooling trend for the pre-industrial Common Era

Decide if inferred material is surface or subsurface seawater. LJ: done 30/11/2018

; archiveType changed - was originally Marine sediment (MS)

updated LiPD file 20/02/2019. LJ. Isotope data have depth

d18O of seawater inferred from d18O carbonate and alkenone-derived temperature

Since d18Ow is linearly related to salinity, it is possible to reconstruct paleosalinity if an independent estimate of temperature is available [Duplessy et al., 1991; Rostek et al., 1993]. Here we use the d18O of the planktic foraminifer Neogloboquadrina pachyderma (dextral) and the alkenone temperature record for estimating paleosalinity variations.

PRA1988: T(cultures) = (Uk37-0.039)/(0.034), (Prahl et al., (1988); cultures E. huxleyi, 8-25i¿½C, n=22; R2=0.994); paleoData_units changed - was originally deg C; climateInterpretation_seasonality changed - was originally Annual; archiveType changed - was originally Marine sediment (MS)

SST data from author not placed on age-depth scale, so I had to generate a control point-to-point linear interpolation using authors reported age control. All O2K-LR records have been quality-controlled according to protocols published in Nature Geoscience supplement; climateInterpretation_seasonality changed - was originally Annual; archiveType changed - was originally Marine sediment (MS)

These are the original, not quality controlled data. O2kLR recommends only using the Quality controlled data.Inadequate chronological constraints, final record that was entered contained an updated age model and dating constraints;

Alkenone concentration calibration to SST

WARNING: no d18Osw in data set. Need to recalculate. Authors adjusted SST by -0.5 deg to correct for depth difference. SSS estimated with d18Osw, d18sw estimated using alkenones, NOT Mg/Ca, N pachy (d) used

temperature (LPD7e8e8eaae): paleoData_isPrimary: '' has been replaced by 'FALSE'
temperature (LPD7e8e8eaae): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (MAT10029c676e): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MAT10029c676e): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
depth (MAT307b063e6e): paleoData_isPrimary: '' has been replaced by 'FALSE'
depth (MAT307b063e6e): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (MAT50c3767672): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MAT50c3767672): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
year (MATf3c78f2a61): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MATf3c78f2a61): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
d18O (MS02FLPC01a): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (MS02FLPC01a): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
d18O (MS02FLPC01b): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (MS02FLPC01b): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
temperature (O2kLR_187): paleoData_isPrimary: '' has been replaced by 'FALSE'
temperature (O2kLR_187): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
temperature (O2kLR_189): paleoData_isPrimary: '' has been replaced by 'FALSE'
temperature (O2kLR_189): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'