Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL082971 |
Is the Noble Gas-Based Rate of Ocean Warming During the Younger Dryas Overestimated? | |
Shackleton, S.1; Bereiter, B.2,3,4; Baggenstos, D.2,3; Bauska, T. K.5; Brook, E. J.6; Marcott, S. A.7; Severinghaus, J. P.1 | |
2019-06-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:11页码:5928-5936 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Switzerland; England |
英文摘要 | Noble gases in ice cores enable reconstructions of past mean ocean temperature. A recent result from the clathrate-containing WAIS Divide Ice Core showed tight covariation between ocean and Antarctic temperatures throughout the last deglaciation, except for the Younger Dryas interval. In the beginning of this interval, oceans warmed at 2.5 degrees C/kyr-three times greater than estimates of modern warming. If valid, this challenges our understanding of the mechanisms controlling ocean heat uptake. Here we reconstruct mean ocean temperature with clathrate-free ice samples from Taylor Glacier to test these findings. The two records agree in net temperature change over the Younger Dryas, but the Taylor Glacier record suggests sustained warming at the more modest rate of 1.1 +/- 0.2 degrees C/kyr. We explore mechanisms to explain differences between records and suggest that the noble gas content for the Younger Dryas interval of WAIS Divide may have been altered by a decimeter-scale fractionation during bubble-clathrate transformation. Plain Language Summary Oceans have taken up most of the additional heat trapped by greenhouse gases, mitigating the current rate of surface warming. In order to understand changes in ocean heat uptake over time, we use atmospheric noble gases measured in ice cores to estimate past ocean temperature change. This method works because the amount of noble gases dissolved in seawater changes with temperature. A recent ocean temperature reconstruction identified a 700-year interval during the transition from the last ice age to the current warm period when oceans warmed three times faster than they are currently warming. This result challenged our understanding of how oceans warm as an ice age ends. We tested this finding with a new ice core record and found that ocean warming during this interval occurred at a rate that is comparable to today, which is more consistent with our understanding of ocean heat uptake. We suggest that the noble gas record in the original ice core was altered by a process that affects how atmospheric gases are distributed in ice and is unrelated to ocean temperature change. From these findings we suggest caution in interpreting noble gas records in ice cores where this process may occur. |
英文关键词 | ice cores ocean heat uptake Younger Dryas bubble-to-clathrate transformation paleoclimate |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000477616200033 |
WOS关键词 | CORE WD2014 CHRONOLOGY ; ICE-CORE ; ATMOSPHERIC CO2 ; CLIMATE ; ISOTOPES ; RECORDS ; AIR ; TRANSFORMATION ; TEMPERATURE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184097 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif San Diego, Scripps Inst Oceanog, San Diego, CA 92103 USA; 2.Univ Bern, Climate & Environm Phys, Inst Phys, Bern, Switzerland; 3.Univ Bern, Oeschger Ctr Climate Res, Bern, Switzerland; 4.Empa, Lab Air Pollut Environm Technol, Dubendorf, Switzerland; 5.Northumbria Univ, Dept Geog & Environm Sci, Newcastle, England; 6.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA; 7.Univ Wisconsin, Dept Geosci, Madison, WI USA |
推荐引用方式 GB/T 7714 | Shackleton, S.,Bereiter, B.,Baggenstos, D.,et al. Is the Noble Gas-Based Rate of Ocean Warming During the Younger Dryas Overestimated?[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(11):5928-5936. |
APA | Shackleton, S..,Bereiter, B..,Baggenstos, D..,Bauska, T. K..,Brook, E. J..,...&Severinghaus, J. P..(2019).Is the Noble Gas-Based Rate of Ocean Warming During the Younger Dryas Overestimated?.GEOPHYSICAL RESEARCH LETTERS,46(11),5928-5936. |
MLA | Shackleton, S.,et al."Is the Noble Gas-Based Rate of Ocean Warming During the Younger Dryas Overestimated?".GEOPHYSICAL RESEARCH LETTERS 46.11(2019):5928-5936. |
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