DOI: 10.1038/s41561-020-00648-2
论文题名: Spatial pattern of super-greenhouse warmth controlled by elevated specific humidity
作者: van Dijk J. ; Fernandez A. ; Bernasconi S.M. ; Caves Rugenstein J.K. ; Passey S.R. ; White T.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 11 起始页码: 739
结束页码: 744
语种: 英语
英文关键词: amplification
; atmospheric moisture
; carbon dioxide
; concentration (composition)
; evaporation
; greenhouse ecosystem
; humidity
; isotopic composition
; oxygen isotope
; Paleocene-Eocene boundary
; partial pressure
; precipitation (climatology)
; reconstruction
; spatial analysis
; Arctic
英文摘要: Earth’s climate sensitivity, defined as the temperature increase for a doubling of partial pressure of carbon dioxide (pCO2), and the mechanisms responsible for amplification of high-latitude warming remain controversial. The latest Palaeocene/earliest Eocene (LPEE; 57–55 million years ago) is a time when atmospheric CO2 concentrations peaked between 1,400 and 4,000 ppm, which allows us to evaluate the climatic response to high pCO2. Here we present a reconstruction of continental temperatures and oxygen isotope compositions of precipitation (reflective of specific humidity) based on clumped and oxygen isotope analysis of pedogenic siderites. We show that continental mean annual temperatures reached 41 °C in the equatorial tropics, and summer temperatures reached 23 °C in the Arctic. The oxygen isotope compositions of precipitation reveal that compared with the present day the hot LPEE climate was characterized by an increase in specific humidity and the average residence time of atmospheric moisture and by a decrease in the subtropical-to-polar specific humidity gradient. The global increase in specific humidity reflects the fact that atmospheric vapour content is more sensitive to changes in pCO2 than evaporation and precipitation, resulting in an increase in the residence time of moisture in the atmosphere. Pedogenic siderite data from other super-greenhouse periods support the evidence that the spatial patterns of specific humidity and warmth are related, providing a new means to evaluate Earth’s climate sensitivity. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169692
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth Sciences, Geological Institute, ETH Zürich, Zürich, Switzerland; Max Planck Institute for Meteorology, Hamburg, Germany; Seckenberg Biodiversity and Climate Research Center, Frankfurt, Germany; CASP, Cambridge, United Kingdom; Earth and Environmental Systems Institute, Pennsylvania State University, State College, PA, United States; Bjerknes Centre for Climate Research and Department of Earth Science, University of Bergen, Bergen, Norway; Department of Geosciences, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
van Dijk J.,Fernandez A.,Bernasconi S.M.,et al. Spatial pattern of super-greenhouse warmth controlled by elevated specific humidity[J]. Nature Geoscience,2020-01-01,13(11)