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Provedor de dados:  ArchiMer
País:  France
Título:  East Asian monsoon history and paleoceanography of the Japan Sea over the last 460,000 years
Autores:  Gallagher, Stephen J
Sagawa, Takuya
Henderson, Andrew C. G.
Saavedra-pellitero, Mariem
De Vleeschouwe, David
Black, Heather
Itaki, Takuya
Toucanne, Samuel
Bassetti, Maria-angela
Clemens, Steve
Anderson, William
Alvarez-zarikian, Carlos
Tada, Ryuji
Data:  2018-07
Ano:  2018
Palavras-chave:  Tsushima Warm Current
East Asian summer monsoon
East Asian winter monsoon
Resumo:  The Japan Sea is directly influenced by the Asian monsoon, a system that transports moisture and heat across southeast Asia during the boreal summer, and is a major driver of the Earth's ocean‐atmospheric circulation. Foraminiferal and facies analyses of a 460 kyr record from IODP Expedition 346 Site U1427 in the Japan Sea reveal a record of nutrient flux and oxygenation that varied due to sea level and East Asian monsoon intensity. The East Asian summer monsoon (EASM) was most intense during MIS (Marine Isotope Stage) 5e, 7e, 9e and 11c when the Tsushima Warm Current flowed into an unrestricted well mixed normal salinity Japan Sea. Whereas East Asian winter monsoon (EAWM) conditions dominated MIS 2, 4, 6 and 8 when sea level minima restricted the Japan Sea resulting in low salinity and oxygen conditions in the absence of Tsushima flow. Reduced oxygen stratified, low salinity, higher productivity oceanic conditions characterise terminations TV, TIII, TII and TI when East China Sea Coastal Waters breached the Tsushima Strait. Chinese loess, cave and Lake Biwa (Japan) and U1427 proxy records suggests EASM intensification during low to high insolation transitions whereas the strongest EAWM prevailed during lowest insolation periods or high to low insolation transitions. Icesheet/CO2 forcing lead to the strongest EAWM events in glacials and enhanced EASM in interglacials. Mismatches between proxy patterns suggests latitudinal and land/sea thermal contrasts played a role in East Asian monsoon variability suggesting a complex interplay between ice sheet dynamics, insolation and thermal gradients controls monsoonal intensity.
Tipo:  Text
Idioma:  Inglês

Editor:  Amer Geophysical Union
Formato:  application/pdf
Fonte:  Paleoceanography And Paleoclimatology (2572-4517) (Amer Geophysical Union), 2018-07 , Vol. 33 , N. 7 , P. 683-702
Direitos:  2018 American Geophysical Union. All rights reserved.


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