DOI: 10.1002/2016JD026011
论文题名: Climate reconstruction using data assimilation of water isotope ratios from ice cores
作者: Steiger N.J. ; Steig E.J. ; Dee S.G. ; Roe G.H. ; Hakim G.J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 3 起始页码: 1545
结束页码: 1568
语种: 英语
英文关键词: climate reconstruction
; data assimilation
; ice cores
; paleoclimate
; water isotopes
Scopus关键词: atmospheric circulation
; climate conditions
; climate modeling
; data assimilation
; geopotential
; ice core
; isotopic ratio
; oxygen isotope
; paleoclimate
; proxy climate record
; reconstruction
; spatiotemporal analysis
; surface temperature
英文摘要: Water isotope data from ice cores, particularly δ18O, have long been used in paleoclimatology. Although δ18O has been primarily interpreted as a proxy for local air temperature, isotope-enabled climate models have established that there are many nonlocal and nontemperature-related climatic influences on isotopic signals at coring locations. Moreover, recent observational studies have linked ice core isotopes to nonlocal patterns of climate variability, particularly to midlatitude atmospheric circulation patterns and to variations in tropical climate. Therefore, paleoclimate reconstructions may better utilize ice core isotope proxies by combining them with isotope-enabled climate models. Here we employ a data assimilation-based technique that fuses isotopic proxy information with the dynamical constraints of climate models. Through several idealized and real proxy experiments we assess the spatial and temporal extent to which isotope records can reconstruct surface temperature, 500 hPa geopotential height, and precipitation. We find local reconstruction skill to be most robust across the reconstructions, particularly for temperature and geopotential height, as well as limited nonlocal skill in the tropics. These results are in agreement with long-held views that isotopes in ice cores have clear value as local climate proxies, particularly for temperature and atmospheric circulation. These results also show that in principle nonlocal climate information may also be inferred from ice cores. However, the spatial range of this information is nonuniform and depends on skillful modeling of the proxy data within the reconstruction process. ©2017. American Geophysical Union. All Rights Reserved.
资助项目: 1304263
; 1503281
; 1504267
; NA14OAR4310176
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62692
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Steiger N.J.,Steig E.J.,Dee S.G.,et al. Climate reconstruction using data assimilation of water isotope ratios from ice cores[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(3)