Widespread six degrees Celsius cooling on land during the Last Glacial Maximum
Widespread six degrees Celsius cooling on land during the Last Glacial Maximum
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末次盛冰期陆地上普遍降温六摄氏度
DOI:
10.1038/s41586-021-03467-6
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发表时间:
2021
期刊:
影响因子:
64.8
通讯作者:
Stute, Martin
中科院分区:
文献类型:
--
作者:
Seltzer, Alan M.;Ng, Jessica;Aeschbach, Werner;Kipfer, Rolf;Kulongoski, Justin T.;Severinghaus, Jeffrey P.;Stute, Martin
The magnitude of global cooling during the Last Glacial Maximum (LGM, the coldest multimillennial interval of the last glacial period) is an important constraint for evaluating estimates of Earth’s climate sensitivity,. Reliable LGM temperatures come from high-latitude ice cores,, but substantial disagreement exists between proxy records in the low latitudes,, , –, where quantitative low-elevation records on land are scarce. Filling this data gap, noble gases in ancient groundwater record past land surface temperatures through a direct physical relationship that is rooted in their temperature-dependent solubility in water,. Dissolved noble gases are suitable tracers of LGM temperature because of their complete insensitivity to biological and chemical processes and the ubiquity of LGM-aged groundwater around the globe,. However, although several individual noble gas studies have found substantial tropical LGM cooling, , –, they have used different methodologies and provide limited spatial coverage. Here we use noble gases in groundwater to show that the low-altitude, low-to-mid-latitude land surface (45 degrees south to 35 degrees north) cooled by 5.8 ± 0.6 degrees Celsius (mean ± 95% confidence interval) during the LGM. Our analysis includes four decades of groundwater noble gas data from six continents, along with new records from the tropics, all of which were interpreted using the same physical framework. Our land-based result broadly supports a recent reconstruction based on marine proxy data assimilation that suggested greater climate sensitivity than previous estimates, –.
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影响因子:
2.3
作者:
M. Stute;J. Clark;P. Schlosser;W. Broecker;G. Bonani
通讯作者:
G. Bonani
影响因子:
3
作者:
J. Saraceno;J. Kulongoski;Timothy M. Mathany
通讯作者:
Timothy M. Mathany
影响因子:
9.8
作者:
Anja Sundal;M. Brennwald;P. Aagaard;R. Kipfer
通讯作者:
R. Kipfer
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
J. C. Corcho Alvarado;F. Barbecot;R. Purtschert;M. Gillon;W. Aeschbach–Hertig;R. Kipfer
通讯作者:
R. Kipfer
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
M. Castro;C. Hall;D. Patriarche;P. Goblet;B. Ellis
通讯作者:
B. Ellis