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Title: Modeling precipitation δ 18O variability in East Asia since the Last Glacial Maximum: temperature and amount effects across different timescales

Water isotopes in precipitation have played a key role in the reconstruction of past climate on millennial timescales and longer. But, for midlatitude regions like East Asia with complex terrain, the reliability behind the basic assumptions of the temperature effect and amount effect is based on modern observational data and still remains unclear for past climate. In the present work, we reexamine the two basic effects on seasonal, interannual, and millennial timescales in a set of time slice experiments for the period 22–0 ka using an isotope-enabled atmospheric general circulation model (AGCM). Our study confirms the robustness of the temperature and amount effects on the seasonal cycle over China in the present climatic conditions, with the temperature effect dominating in northern China and the amount effect dominating in the far south of China but no distinct effect in the transition region of central China. However, our analysis shows that neither temperature nor amount effect is significantly dominant over China on millennial and interannual timescales, which is a challenge to those classic assumptions in past climate reconstruction. This work helps shed light on the interpretation of the proxy record of δ 18O from a modeling point of view.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [1]
  1. Peking Univ., Beijing (China). Dept. of Atmospheric and Oceanic Sciences
  2. Univ. of Wisconsin, Madison, WI (United States). Nelson Inst. of Environmental Studies
  3. Nanjing Univ. of Information Science and Technology (China)
  4. National Center for Atmospheric Research, Boulder, CO (United States). Earth System Lab.
  5. Univ. of Colorado, Boulder, CO (United States). Cooperative Inst. for Research in Environmental Sciences
Publication Date:
Grant/Contract Number:
41130105; 41130962; 41005035; YETP0005
Type:
Published Article
Journal Name:
Climate of the Past
Additional Journal Information:
Journal Volume: 12; Journal Issue: 11; Journal ID: ISSN 1814-9332
Publisher:
European Geophysical Union - Copernicus
Research Org:
Peking Univ., Beijing (China). Dept. of Atmospheric and Oceanic Sciences
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1332379
Alternate Identifier(s):
OSTI ID: 1375433