West Pacific Marginal Seas during Last Glacial Maximum: Amplification of Environmental Signals and Its Impact on Monsoon Climate*
2020; Informa; Linguagem: Inglês
10.1201/9780429070884-5
AutoresPinxian Wang, M. Bradshaw, S.S. Ganzei, S. Tsukawaki, Kamaludin Hassan, Wahyoe S. Hantoro, S. Poobrasert, Robert V. Burne, Quanhong Zhao, Hiroshi KAGAMI,
Tópico(s)Geology and Paleoclimatology Research
ResumoA paleogeographic map has been compiled for the time slice of the last glacial maximum (15–20 kaBP) covering the Western Pacific region with emphasis laid on the marginal seas. This UNESCO/IOC map (1:20,000,000) is based on paleogeographic and paleoenvironmental data from 779 offshore and onshore sites, and about five hundred publications have been collected for this purpose. As seen from the Paleogeographic Map, the emergence of extensive continental shelves was the most outstanding geographic feature of the last glacial maximum in the West Pacific region. The sea-level induced environmental signal has been amplified in the marginal seas, giving rise to drastic changes in sea areas and configurations, and to reorganization of sea water circulation in seas of enclosed basin type. Since most of the Western Pacific marginal seas are influenced by monsoon circulation and some of these are located within the Western Pacific Warm Pool, the glacial geographic changes have produced a profound impact on regional and global climate. For example, the decrease of sea area and sea surface temperature (SST) in the marginal seas was one of factors responsible for the enhanced aridity of inland China during the glaciation. Glacial intensification of the winter monsoon and increased seasonality of SST in marginal seas might explain, at least partly, the apparent discrepancy between the tropical paleotemperature estimations based on terrestrial and open-ocean records in this region.
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