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Widespread six degrees Celsius cooling on land during the Last Glacial Maximum.
Seltzer, Alan M; Ng, Jessica; Aeschbach, Werner; Kipfer, Rolf; Kulongoski, Justin T; Severinghaus, Jeffrey P; Stute, Martin.
Afiliación
  • Seltzer AM; Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA. aseltzer@whoi.edu.
  • Ng J; Geosciences Research Division, Scripps Institution of Oceanography, La Jolla, CA, USA.
  • Aeschbach W; Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany.
  • Kipfer R; Department of Water Resources and Drinking Water, Swiss Federal Institute of Aquatic Science and Technology, Eawag, Dübendorf, Switzerland.
  • Kulongoski JT; Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, Swiss Federal Institute Technology, ETHZ, Zurich, Switzerland.
  • Severinghaus JP; Institute of Geochemistry and Petrology, Department of Earth Sciences, Swiss Federal Institute Technology, ETHZ, Zurich, Switzerland.
  • Stute M; Geosciences Research Division, Scripps Institution of Oceanography, La Jolla, CA, USA.
Nature ; 593(7858): 228-232, 2021 05.
Article en En | MEDLINE | ID: mdl-33981051
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 sensitivity1,2. Reliable LGM temperatures come from high-latitude ice cores3,4, but substantial disagreement exists between proxy records in the low latitudes1,5-8, 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 water9,10. 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 globe11,12. However, although several individual noble gas studies have found substantial tropical LGM cooling13-16, 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 assimilation1 that suggested greater climate sensitivity than previous estimates5-7.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Cambio Climático / Clima / Frío / Cubierta de Hielo Idioma: En Revista: Nature Año: 2021 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Cambio Climático / Clima / Frío / Cubierta de Hielo Idioma: En Revista: Nature Año: 2021 Tipo del documento: Article País de afiliación: Estados Unidos