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

Journal Article · · Climate of the Past (Online)

Water isotopes in precipitation have played a key role in the reconstruction of past climate on millennial timescales and longer. However, 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. Our work helps shed light on the interpretation of the proxy record of δ18O from a modeling point of view.

Research Organization:
Peking Univ., Beijing (China). Dept. of Atmospheric and Oceanic Sciences
Sponsoring Organization:
USDOE
Grant/Contract Number:
41130105; 41130962; 41005035; YETP0005
OSTI ID:
1332379
Alternate ID(s):
OSTI ID: 1375433
Journal Information:
Climate of the Past (Online), Journal Name: Climate of the Past (Online) Vol. 12 Journal Issue: 11; ISSN 1814-9332
Publisher:
Copernicus Publications, EGUCopyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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