d18O (LS06TIST): interpretation3_scope: '' has been replaced by 'isotope'
d18O (LS06TIST): interpretation4_scope: '' has been replaced by 'isotope'

Tian, Jian , Nelson, David M. , Hu, Feng Sheng

Tian, J., Nelson, D. M. and Hu, F. S.: Possible linkages of late-Holocene drought in the North American midcontinent to Pacific Decadal Oscillation and solar activity, Geophysical Research Letters, 33(23), doi:10.1029/2006gl028169, 2006.

Possible linkages of late-Holocene drought in the North American midcontinent to Pacific Decadal Oscillation and solar activity

Kiel automated device for isotope ratio mass spectrometry on a Finnigan Delta XL mass ratio spectrometer.

Chara encrustations, ostracodes, gastropod and mollusk shell fragments and the <125-mm fraction of marl sediment from selected intervals of the core

Bulk sediment samples were taken from core C/E for isotope analyses at 0.5-cm increments for the uppermost 16.5 cm (32 field-extruded samples; Glew, 1988; Glew et al., 2001), at 1-cm increments from 16.5-cm depth to the White River Ash at 64-cm depth, and at 2-cm increments from 64- to 144-cm depth for a total of 121 samples. The bulk sediment samples were wet sieved through nested screens (63, 125, 250-mm), collected separately and freeze dried. At least five individual Chara stem encrustations (1?3 mm each in length) were picked from the dried fractions, examined for purity, homogenized and sub- sampled for CO2 extraction

18O-enrichment in Marcella Lake water caused by summer effective moisture conditions; These prominent late Holocene changes in effective moisture occurred simultaneously with changes in Aleutian Low circulation patterns over the Gulf of Alaska indicated by Jellybean Lake. The reconstructed climate patterns are consistent with the topographically controlled climatic heterogeneity observed in the coastal mountains and interior valleys of the region today

effective moisture occurred simultaneously with changes in Aleutian Low circulation

Temperature fractionations between calcite and lake water were considered and are thought to be minor (0.25%/1C).