A 3500-Year Ice Chemistry Record From The Dominion Range, Antarctica: Linkages Between Climatic Variations and Precipitation Chemistry

In 1984 a 200-m ice core was collected from a local accumulation basin in the Dominion Range, Transantarctic Mountains, Antarctica. A complete oxygen isotope record has been obtained and a considerable portion of the core has been analyzed in detail for chloride, nitrate, sulfate, and sodium. About half of the chloride is due to sea salt with the remainder originating as gaseous HCl. Nitrate levels have increased markedly over the last 1000 years whereas the levels of the other constituents have remained fairly constant.The oxygen isotope results suggest that this region of Antarctica is responding to long-term global climate forcing as well as to shorter-term climatic variations. This data will be compared with the anion and sodium records in order to determine the effects of climatic forcing on these other records. In particular, nitrate appears to vary in concert with fluctuations in long-term climate. Additionally, variations in each constituent over the 3500 year period will be examined in detail to determine the influence of other processes which affect their concentrations.

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A 3500-Year Ice Chemistry Record From The Dominion Range, Antarctica: Linkages Between Climatic Variations and Precipitation Chemistry

Annals of Glaciology ◽

10.1017/s0260305500009356 ◽

1990 ◽

Vol 14 ◽

pp. 358

Author(s):

Mary Jo Spencer ◽

Paul A. Mayewski ◽

W. Berry Lyons ◽

Mark S. Twickler ◽

Pieter Grootes

Keyword(s):

Oxygen Isotope ◽

Global Climate ◽

Ice Core ◽

Precipitation Chemistry ◽

Climate Forcing ◽

Climatic Forcing ◽

Climatic Variations ◽

Oxygen Isotope Record ◽

Isotope Record

In 1984 a 200-m ice core was collected from a local accumulation basin in the Dominion Range, Transantarctic Mountains, Antarctica. A complete oxygen isotope record has been obtained and a considerable portion of the core has been analyzed in detail for chloride, nitrate, sulfate, and sodium. About half of the chloride is due to sea salt with the remainder originating as gaseous HCl. Nitrate levels have increased markedly over the last 1000 years whereas the levels of the other constituents have remained fairly constant. The oxygen isotope results suggest that this region of Antarctica is responding to long-term global climate forcing as well as to shorter-term climatic variations. This data will be compared with the anion and sodium records in order to determine the effects of climatic forcing on these other records. In particular, nitrate appears to vary in concert with fluctuations in long-term climate. Additionally, variations in each constituent over the 3500 year period will be examined in detail to determine the influence of other processes which affect their concentrations.

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An oxygen isotope record from the Foscagno rock-glacier ice core, Upper Valtellina, Italian Central Alps

The Holocene ◽

10.1177/0959683607082438 ◽

2007 ◽

Vol 17 (7) ◽

pp. 1033-1039 ◽

Cited By ~ 10

Author(s):

Barbara Stenni ◽

Laura Genoni ◽

Onelio Flora ◽

Mauro Guglielmin

Keyword(s):

Oxygen Isotope ◽

Ice Core ◽

Central Alps ◽

Rock Glacier ◽

Oxygen Isotope Record ◽

Isotope Record ◽

Glacier Ice

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Is There Evidence for Solar Forcing of Climate in the GISP2 Oxygen Isotope Record?

Quaternary Research ◽

10.1006/qres.1997.1931 ◽

1997 ◽

Vol 48 (3) ◽

pp. 259-266 ◽

Cited By ~ 115

Author(s):

M. Stuiver ◽

T. F. Braziunas ◽

P. M. Grootes ◽

G. A. Zielinski

Keyword(s):

Oxygen Isotope ◽

Ice Core ◽

Greenland Ice Sheet ◽

Ice Age ◽

Phase Lag ◽

Solar Forcing ◽

Solar Constant ◽

Oxygen Isotope Record ◽

Isotope Record ◽

Isotope Profile

Changes in solar constant over an 11 yr cycle suggest a certain, but limited, degree of solar forcing of climate. The high-resolution climate (oxygen isotope) record of the Greenland GISP2 (Greenland Ice Sheet Project 2) ice core has been analyzed for solar (and volcanic) influences. The atmospheric 14C record is used as a proxy of solar change and compared to the oxygen isotope profile in the GISP2 ice core. An annual oxygen isotope profile is derived from centimeter-scale isotope measurements available for the post-A.D. 818 interval. Associated extreme summer and winter isotope ratios were found to yield similar climate information over the last millennium. The detailed record of volcanic aerosols, converted to optical depth and volcanic explosivity change, was also compared to the isotope record and the oxygen isotope response calibrated to short-term volcanic influences on climate. This calibration shows that century-scale volcanic modulation of the GISP2 oxygen isotope record can be neglected in our analysis of solar forcing. The timing, estimated order of temperature change, and phase lag of several maxima in 14C and minima in18O are suggestive of a solar component to the forcing of Greenland climate over the current millennium. The fractional climate response of the cold interval associated with the Maunder sunspot minimum (and 14C maximum), as well as the Medieval Warm Period and Little Ice Age temperature trend of the past millennium, are compatible with solar climate forcing, with an order of magnitude of solar constant change of ∼0.3%. Even though solar forcing of climate for the current millennium is a reasonable hypothesis, for the rest of the Holocene the century-scale events are more frequent in the oxygen isotope record than in the 14C record and a significant correlation is absent. For this interval, oceanic/atmospheric circulation forcing of climate may dominate. Solar forcing during the surprisingly strong 1470 yr climate cycle of the 11,000–75,000 yr B.P. interval is rather hypothetical.

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Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene

Climate of the Past ◽

10.5194/cp-7-869-2011 ◽

2011 ◽

Vol 7 (3) ◽

pp. 869-880 ◽

Cited By ~ 60

Author(s):

D. Liebrand ◽

L. J. Lourens ◽

D. A. Hodell ◽

B. de Boer ◽

R. S. W. van de Wal ◽

...

Keyword(s):

Global Climate ◽

Ice Sheet ◽

Early Miocene ◽

High Temporal Resolution ◽

Short Term ◽

Antarctic Ice Sheet ◽

Oxygen Isotope Record ◽

Isotope Record ◽

The Antarctic

Abstract. Stable isotope records of benthic foraminifera from ODP Site 1264 in the southeastern Atlantic Ocean are presented which resolve the latest Oligocene to early Miocene (~24–19 Ma) climate changes at high temporal resolution (<3 kyr). Using an inverse modelling technique, we decomposed the oxygen isotope record into temperature and ice volume and found that the Antarctic ice sheet expanded episodically during the declining phase of the long-term (~400 kyr) eccentricity cycle and subsequent low short-term (~100 kyr) eccentricity cycle. The largest glaciations are separated by multiple long-term eccentricity cycles, indicating the involvement of a non-linear response mechanism. Our modelling results suggest that during the largest (Mi-1) event, Antarctic ice sheet volume expanded up to its present-day configuration. In addition, we found that distinct ~100 kyr variability occurs during the termination phases of the major Antarctic glaciations, suggesting that climate and ice-sheet response was more susceptible to short-term eccentricity forcing at these times. During two of these termination-phases, δ18O bottom water gradients in the Atlantic ceased to exist, indicating a direct link between global climate, enhanced ice-sheet instability and major oceanographic reorganisations.

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No substantial long-term bias in the Cenozoic benthic foraminifera oxygen-isotope record

Nature Communications ◽

10.1038/s41467-018-05303-4 ◽

2018 ◽

Vol 9 (1) ◽

Cited By ~ 2

Author(s):

David Evans ◽

Marcus P. S. Badger ◽

Gavin L. Foster ◽

Michael J. Henehan ◽

Caroline H. Lear ◽

...

Keyword(s):

Oxygen Isotope ◽

Benthic Foraminifera ◽

Oxygen Isotope Record ◽

Isotope Record

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14C Ages of a Varved Last Glacial Maximum Section Off Pakistan

Radiocarbon ◽

10.1017/s0033822200032811 ◽

2003 ◽

Vol 45 (3) ◽

pp. 467-477 ◽

Cited By ~ 2

Author(s):

Ulrich von Rad ◽

Michael Sarnthein ◽

Pieter M Grootes ◽

Heidi Doose-Rolinski ◽

Jochen Erbacher

Keyword(s):

Mass Spectrometry ◽

Oxygen Isotope ◽

Last Glacial Maximum ◽

Accelerator Mass Spectrometry ◽

Ice Core ◽

Glacial Maximum ◽

Last Glacial ◽

Oxygen Isotope Record ◽

Isotope Record

In a core off Pakistan, we obtained 38 14C analyses by accelerator mass spectrometry (AMS) from a 4.4-m-thick, expanded, annually-laminated Last Glacial Maximum (LGM) section, bracketed by bioturbated intervals ascribed to the Heinrich-1 (H1) and Heinrich-2 (H2) equivalent events (52 14C analyses between 24–15 kyr BP). A floating varve age scale, anchored to the oxygen isotope record of the layer-counted GISP2 ice core at the H2/LGM boundary, results in an annually dated record for the LGM from 23,450–17,900 cal BP. The floating varve scale of the LGM provides us with a tentative calibration of local marine AMS 14C age dates to calendar years.

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