scholarly journals Effects of seasonal variability of accumulation on yearly mean δ18O values in Antarctic snow

1999 ◽  
Vol 45 (151) ◽  
pp. 463-468 ◽  
Author(s):  
Elisabeth Schlosser
Keyword(s):  
Oxygen Isotope ◽  
Seasonal Variability ◽  
Ice Cores ◽  
Circulation Pattern ◽  
Temperature Record ◽  
Oxygen Isotope Record ◽  
Antarctic Snow ◽  
Isotope Record ◽  
Isotope Content

AbstractThe annual mean oxygen-isotope content of Antarctic snow is strongly influenced by the seasonal variability of accumulation. Since the annual mean δ18O value is frequently used to derive mean annual temperatures from ice cores, changes in atmospheric circulation pattern can lead to large errors in the deduced temperature record. At the German Antarctic wintering base, Neumayer, accumulation measurements have been carried out continuously over the last 16 years. Weekly readings of accumulation stakes combined with snow pits and shallow firn cores are used to investigate the influence of the seasonal variability of accumulation on the annual mean δ18O values and to estimate the possible error in the determination of annual mean temperatures from ice cores by using the oxygen-isotope record.

scholarly journals Effects of seasonal variability of accumulation on yearly mean δ18O values in Antarctic snow

1999 ◽  
Vol 45 (151) ◽  
pp. 463-468 ◽  
Author(s):  
Elisabeth Schlosser
Keyword(s):  
Oxygen Isotope ◽  
Seasonal Variability ◽  
Ice Cores ◽  
Circulation Pattern ◽  
Temperature Record ◽  
Oxygen Isotope Record ◽  
Antarctic Snow ◽  
Isotope Record ◽  
Isotope Content

AbstractThe annual mean oxygen-isotope content of Antarctic snow is strongly influenced by the seasonal variability of accumulation. Since the annual mean δ18O value is frequently used to derive mean annual temperatures from ice cores, changes in atmospheric circulation pattern can lead to large errors in the deduced temperature record. At the German Antarctic wintering base, Neumayer, accumulation measurements have been carried out continuously over the last 16 years. Weekly readings of accumulation stakes combined with snow pits and shallow firn cores are used to investigate the influence of the seasonal variability of accumulation on the annual mean δ18O values and to estimate the possible error in the determination of annual mean temperatures from ice cores by using the oxygen-isotope record.

A Detailed 31,000-Year Record of Climate and Vegetation Change, from the Isotope Geochemistry of Two New Zealand Speleothems

1998 ◽  
Vol 50 (2) ◽  
pp. 167-178 ◽  
Author(s):  
John Hellstrom ◽  
Malcolm McCulloch ◽  
John Stone
Keyword(s):  
New Zealand ◽  
Oxygen Isotope ◽  
Vegetation Change ◽  
Younger Dryas ◽  
Ice Cores ◽  
Subtropical Front ◽  
Oxygen Isotope Stage ◽  
Oxygen Isotope Record ◽  
Isotope Record ◽  
Glacier Advance

Uranium-series dating and stable isotope analyses of two speleothems from northwest Nelson, New Zealand, record changes in regional climate and local forest extent over the past 31,000 years. Oxygen isotope variation in these speleothems primarily represents changes in the meteoric waters falling above the caves, possibly responding to latitudinal changes in the position of the Subtropical Front in the Tasman Sea. Seven positive excursions can be identified in the oxygen isotope record, which coincide with periods of glacier advance, known to be sensitive to northward movement of the Subtropical Front. Four glacier advances occurred during oxygen isotope stage 2, with the most extreme glacial conditions centered on 19,000 cal yr B.P. An excursion in the oxygen isotope record from 13,800 to 11,700 cal yr B.P. provides support for a previously identified New Zealand glacier advance at the time of the Younger Dryas Stade, but suggests it began slightly before the Younger Dryas as recorded in Greenland ice cores. Carbon isotope variations in the speleothems record changes in forest productivity, closely matching existing paleovegetation records. On the basis of vegetation changes, stage 2 glacial climate conditions terminated abruptly in central New Zealand, from 15,700 to 14,200 cal yr B.P. Evidence of continuous speleothem growth at one site suggests that depression of the local treeline was limited to 600–700 m below its present altitude, throughout the last 31,000 years.

A revised seawater sulfate oxygen isotope record for the last 4 Myr

2016 ◽  
Vol 175 ◽  
pp. 239-251 ◽  
Author(s):  
Stefan Markovic ◽  
Adina Paytan ◽  
Hong Li ◽  
Ulrich G. Wortmann
Keyword(s):  
Oxygen Isotope ◽  
Seawater Sulfate ◽  
Oxygen Isotope Record ◽  
Isotope Record

Temperature sensitivity of planktic foraminifera and its influence on the oxygen isotope record

1998 ◽  
Vol 33 (3-4) ◽  
pp. 223-240 ◽  
Author(s):  
Stefan Mulitza ◽  
Tobias Wolff ◽  
Jürgen Pätzold ◽  
Walter Hale ◽  
Gerold Wefer
Keyword(s):  
Oxygen Isotope ◽  
Temperature Sensitivity ◽  
Planktic Foraminifera ◽  
Oxygen Isotope Record ◽  
Isotope Record

A 5000-year lacustrine sediment oxygen isotope record of late Holocene climate change in Newfoundland, Canada

2022 ◽  
Vol 278 ◽  
pp. 107376
Author(s):  
Matthew S. Finkenbinder ◽  
Byron A. Steinman ◽  
Broxton W. Bird ◽  
Ellen C. Heilman ◽  
Alexandria R. Aspey ◽  
...  
Keyword(s):  
Climate Change ◽  
Oxygen Isotope ◽  
Late Holocene ◽  
Lacustrine Sediment ◽  
Holocene Climate ◽  
Holocene Climate Change ◽  
Oxygen Isotope Record ◽  
Isotope Record

Speleothems, Travertines, and Paleoclimates

1983 ◽  
Vol 20 (1) ◽  
pp. 1-29 ◽  
Author(s):  
G. J. Hennig ◽  
R. Grün ◽  
K. Brunnacker
Keyword(s):  
Oxygen Isotope ◽  
Deep Sea ◽  
Clear Relationship ◽  
Sufficient Data ◽  
Geographic Position ◽  
Oxygen Isotope Record ◽  
Isotope Record ◽  
Age Range ◽  
Stimulation Of ◽  
Frequency Curves

AbstractAge data for about 660 speleothems and about 140 spring-deposited travertines were collected, including many unpublished results. These data were plotted as histograms and also as error-weighted frequency curves on a 350,000-yr scale. These plots clearly show periods of increased speleothem/travertine growth as well as times of cessation. The periods of most frequent speleothem growth were between approximately 130,000 and 90,000 yr ago and since about 15,000 yr ago. Such periods before 150,000 yr ago, however, cannot be yet recognized because of a lack of sufficient data and the associated uncertainties of dates in this age range. A comparison with the oxygen-isotope record of deep-sea core V28–:238 shows a clear relationship, indicating that terrestrial calcite formation is controlled by paleoclimatic fluctuations. The evident climatic stimulation of Quaternary calcite formation is readily explained geochemically and is substantiated by the obvious difference in speleothem/travertine growth as a function of geographic position.

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