globalchange  > 气候减缓与适应
DOI: 10.1029/2018JD028424
Scopus记录号: 2-s2.0-85048984477
论文题名:
Interpreting Precession-Driven δ18O Variability in the South Asian Monsoon Region
作者: Tabor C.R.; Otto-Bliesner B.L.; Brady E.C.; Nusbaumer J.; Zhu J.; Erb M.P.; Wong T.E.; Liu Z.; Noone D.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期:11
起始页码: 5927
结束页码: 5946
语种: 英语
英文关键词: Earth system model ; orbital variability ; paleoclimate ; South Asian monsoon ; speleothems ; water isotopes
Scopus关键词: calcium carbonate ; eccentricity ; evaporation ; monsoon ; Northern Hemisphere ; oxygen isotope ; paleoclimate ; precession ; soil water ; speleothem ; summer ; temperature ; tracer ; South Asia
英文摘要: Speleothem records from the South Asian summer monsoon (SASM) region display variability in the ratio of 18O and 16O (δ18O) in calcium carbonate at orbital frequencies. The dominant mode of variability in many of these records reflects cycles of precession. There are several potential explanations for why SASM speleothem records show a strong precession signal, including changes in temperature, precipitation, and circulation. Here we use an Earth system model with water isotope tracers and water-tagging capability to deconstruct the precession signal found in SASM speleothem records. Our results show that cycles of precession-eccentricity produce changes in SASM intensity that correlate with local temperature, precipitation, and δ18O. However, neither the amount effect nor temperature differences are responsible for the majority of the SASM δ18O variability. Instead, changes in the relative moisture contributions from different source regions drive much of the SASM δ18O signal, with more nearby moisture sources during Northern Hemisphere summer at aphelion and more distant moisture sources during Northern Hemisphere summer at perihelion. Further, we find that evaporation amplifies the δ18O signal of soil water relative to that of precipitation, providing a better match with the SASM speleothem records. This work helps explain a significant portion of the long-term variability found in SASM speleothem records. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113708
Appears in Collections:气候减缓与适应

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作者单位: Center for Integrative Geosciences, University of Connecticut, Storrs, CT, United States; Climate and Global Dynamics Lab, National Center for Atmospheric Research, Boulder, CO, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, United States; Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, AZ, United States; Department of Computer Science, University of Colorado Boulder, Boulder, CO, United States; Atmospheric Science Program, Department of Geography, Ohio State University, Columbus, OH, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States

Recommended Citation:
Tabor C.R.,Otto-Bliesner B.L.,Brady E.C.,et al. Interpreting Precession-Driven δ18O Variability in the South Asian Monsoon Region[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(11)
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