DOI: 10.1002/2015GL064829
论文题名: A mechanistic analysis of early Eocene latitudinal gradients of isotopes in precipitation
作者: Winnick M.J. ; Caves J.K. ; Chamberlain C.P.
刊名: Geophysical Research Letters
ISSN: 0094-8548
EISSN: 1944-8279
出版年: 2015
卷: 42, 期: 19 起始页码: 8216
结束页码: 8224
语种: 英语
英文关键词: Eocene climate
; isotope gradients
; oxygen isotopes
; precipitation
Scopus关键词: Humidity control
; Precipitation (chemical)
; Eocene climate
; General circulation model simulations
; Latitudinal gradients
; Mechanistic analysis
; Meridional gradients
; Oxygen isotopes
; Polar amplifications
; Reactive transport modeling
; Isotopes
; carbon dioxide
; Eocene
; general circulation model
; humidity
; latitudinal gradient
; meridional circulation
; one-dimensional modeling
; oxygen isotope
; precipitation (climatology)
; proxy climate record
; reactive transport
; reconstruction
英文摘要: We use a one-dimensional reactive transport model of isotopes in precipitation (δ18O) to investigate the physical mechanisms controlling global meridional isotope profiles under early Eocene hothouse conditions. Simulations of early Eocene precipitation isotopes display reduced meridional gradients relative to the modern climate with the largest increases in δ18O occurring at high latitudes, matching proxy data. These reduced gradients are controlled primarily by polar amplification that increases high-latitude length scales of specific humidity and match our compilation of proxy-based reconstructions. Comparing Eocene general circulation model simulations run with pCO2 of 2240 and 4480 ppm, we find that meridional isotopic profiles are insensitive to the associated 5°C change in global temperatures due to the relative lack of polar amplification. Finally, we hypothesize that observed negative δD anomalies in precipitation during peak warming of early Eocene hyperthermal events are the result of a theorized reduction in the strength of midlatitude transient eddies. Key Points Data-model comparison of latitudinal gradients of early Eocene precipitation isotopes Gradients in hothouse climates controlled by degree of polar amplification and transport Gradients are insensitive to warming/cooling within hothouse climates © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84947045994&doi=10.1002%2f2015GL064829&partnerID=40&md5=52c34c598291d3ee6d15bda03fc52e17
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8164
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth System Science, Stanford University, Stanford, CA, United States
Recommended Citation:
Winnick M.J.,Caves J.K.,Chamberlain C.P.. A mechanistic analysis of early Eocene latitudinal gradients of isotopes in precipitation[J]. Geophysical Research Letters,2015-01-01,42(19).