期刊
GLOBAL AND PLANETARY CHANGE
卷 217, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.gloplacha.2022.103952
关键词
Tropical hydroclimate; High-latitude forcing; Sea-surface salinity; Diatom blooms; Model simulation; Tropical West Pacific
资金
- National Natural Science Foundation of China (NSFC) [41830539]
- Evaluation and Effect of Paleoclimatic Evolution [GASI-04-QYQH-04]
- Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) [2022QNLM050203]
- NSFC [41576051, U1606401]
- Taishan Scholars Project Funding [ts20190963]
- Basic Scientific Fund for National Public Research Institutes of China [2019S04, 2017Y07]
- Chinese Academy of Sciences [XDB42000000]
This study investigated the precipitation changes in the Indo-Pacific Warm Pool (IPWP) during the Last Glacial Maximum (LGM) using a sediment core from the eastern Philippine Sea. The results showed an overall drying trend in the IPWP during the LGM. Comparison with modeling results suggested that extra-tropical factors controlled the precipitation variability in the IPWP during the LGM.
The magnitude, direction and cause of precipitation changes across the Indo-Pacific Warm Pool (IPWP) during the Last Glacial Maximum (LGM) remain elusive. In particular, it is still inconclusive whether tropical or extra -tropical factors controlled such precipitation changes. Determining the spatio-temporal distribution of precipi-tation in the IPWP during the LGM is a valid strategy to address this issue, but the existing precipitation records are dominantly from maritime continents and marginal seas, with few data from pelagic oceans. In order to fill this gap, we analyzed the oxygen isotopic compositions of single Ethmodiscus rex diatom frustules (delta 18OE. rex) from a sediment core (WPD-03) consisting of laminated diatom mats (LDMs) in the eastern Philippine Sea (EPS). delta 18OE. rex was controlled mainly by sea-surface salinity variation and, thus, can reflect open-ocean precipitation changes across the IPWP. Our precipitation proxy records, in combination with existing published data, reveal spatial patterns of precipitation change that indicate overall drying across the IPWP during the LGM. Based on a comparison of paleoclimatic records with modeling results, we propose that extra-tropical factors (ice-sheet size) controlled precipitation variability in the IPWP during the LGM through a combination of zonal shifts of ENSO and meridional migration of the ITCZ. Strong aridity during the LGM prevented formation of a subsurface barrier layer and, hence, allowed accessing of sufficient nutrients to surface waters, stimulating blooms of E. rex and subsequent formation of LDMs in the IPWP. These findings suggest an important role for high-latitude climate in the tropical hydrological cycle during the LGM.
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