Enriched East Asian oxygen isotope of precipitation indicates reduced summer seasonality in regional climate and westerlies.

ABSTRACT: Speleothem oxygen isotope records over East Asia reveal apparently large and rapid paleoclimate changes over the last several hundred thousand years. However, what the isotopic variation actually represent in terms of the regional climate and circulation is debated. We present an answer that emerges from an analysis of the interannual variation in amount-weighted annual δ¹⁸O of precipitation over East Asia as simulated by an isotope-enabled model constrained by large-scale atmospheric reanalysis fields. ¹⁸O-enriched years have reduced summer seasonality both in terms of precipitation isotopes and in the large-scale circulation. Changes occur between June and October, where the δ¹⁸O of precipitation (δ¹⁸O_p) transitions from the isotopic

SUBMITTER: Chiang JCH 

PROVIDER: S-EPMC7334498 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature