skip to main content

DOE PAGESDOE PAGES

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

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.
Authors:
; ; ; ; ; ;
Publication Date:
OSTI Identifier:
1332379
Grant/Contract Number:
SciDac
Type:
Published Article
Journal Name:
Climate of the Past
Additional Journal Information:
Journal Volume: 12; Journal Issue: 11; Related Information: CHORUS Timestamp: 2016-11-16 08:04:40; Journal ID: ISSN 1814-9332
Publisher:
Copernicus GmbH
Sponsoring Org:
USDOE
Country of Publication:
Country unknown/Code not available
Language:
English