气候变化领域集成服务门户(CCPortal): Dynamics of primary productivity in the northeastern Bay of Bengal over the last 26000 years

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DOI	10.5194/cp-16-1969-2020
	Dynamics of primary productivity in the northeastern Bay of Bengal over the last 26000 years
	Zhou X.; Duchamp-Alphonse S.; Kageyama M.; Bassinot F.; Beaufort L.; Colin C.
发表日期	2020
ISSN	18149324
起始页码	1969
结束页码	1986
卷号	16 期号:5
英文摘要	At present, variations of primary productivity (PP) in the Bay of Bengal (BoB) are driven by salinity-related stratification, which is controlled by the Indian summer monsoon (ISM). The relationships between PP, precipitation, and more generally climate in the past are not clearly understood. Here, we present a new record of PP based on the examination of coccolithophore assemblages in a 26000-year sedimentary series retrieved in the northeastern BoB (core MD77-176). We compare our PP records to published climate and monsoon records, as well as outputs from numerical experiments obtained with the Earth system model IPSL-CM5A-LR, including the marine biogeochemical component PISCES, and with the transient climate simulation TraCE-21. Our results show that PP was most probably controlled by nutrient contents and distribution within the upper water column, which were predominantly influenced by (i) regional river systems between 26 and 19ka, i.e. when sea level was relatively low and climate was relatively dry, and (ii) salinity-related stratification over the last 19kyr, i.e. when sea level rose and more humid conditions prevailed. During that period, salinity and stratification were directly related to monsoon precipitation dynamics, which were chiefly forced by both insolation and Atlantic meridional overturning circulation (AMOC) strength. During Heinrich Stadial 1 and the Younger Dryas, i.e. when the AMOC collapsed, weaker South Asian precipitation diminished stratification and enhanced PP. During Bølling-Allerød, i.e. when the AMOC recovered, stronger South Asian precipitation increased stratification and subdued PP. Similarly, the precipitation peak recorded around the middle-early Holocene is consistent with a stronger stratification that drives PP minima. © 2020 Author(s).
语种	英语
scopus关键词	climate variation; empirical analysis; numerical model; primary production; sediment core; Bay of Bengal; Indian Ocean
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146659
作者单位	Université Paris-Saclay, Géosciences Paris Sud, UMR 8148, CNRS, Rue du Belvédère, Orsay, 91405, France; Laboratoire des Sciences du Climat et de l'Environnement, UMR 8112, CEA/CNRS/UVSQ, Université Paris-Saclay, Centre CEA-Saclay, Orme des Merisiers, Gif-sur-Yvette, 91191, France; Centre de Recherche et d'Enseignement de Géosciences de l'Environnement, UMR 7330, CNRS/IRD/Aix-Marseille Université, Av. Louis Philibert, Aix-en-Provence, 13545, France
推荐引用方式 GB/T 7714	Zhou X.,Duchamp-Alphonse S.,Kageyama M.,et al. Dynamics of primary productivity in the northeastern Bay of Bengal over the last 26000 years[J],2020,16(5).
APA	Zhou X.,Duchamp-Alphonse S.,Kageyama M.,Bassinot F.,Beaufort L.,&Colin C..(2020).Dynamics of primary productivity in the northeastern Bay of Bengal over the last 26000 years.Climate of the Past,16(5).
MLA	Zhou X.,et al."Dynamics of primary productivity in the northeastern Bay of Bengal over the last 26000 years".Climate of the Past 16.5(2020).