气候变化领域集成服务门户(CCPortal): Monsoon-influenced variations in plankton community structure and upper-water column stratification in the western Bay of Bengal during the past 80 ky

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DOI	10.1016/j.palaeo.2019.02.020
	Monsoon-influenced variations in plankton community structure and upper-water column stratification in the western Bay of Bengal during the past 80 ky
	Ota Y.; Kuroda J.; Yamaguchi A.; Suzuki A.; Araoka D.; Ishimura T.; Kawahata H.; NGHP Expedition 02 JAMSTEC Science Team
发表日期	2019
ISSN	0031-0182
起始页码	138
结束页码	150
卷号	521
英文摘要	To enhance our understanding of the forcing factors of marine biological community structure in the Bay of Bengal, we studied proxies for biogenic carbonate and silicate production in the western Bay of Bengal and compared them with proxies for upper-ocean stratification and strength of the Indian summer monsoon (ISM). Specifically, we investigated the record in a sediment core from the western Bay of Bengal that extended to approximately 80 ky before the present (BP). The records of Globigerinoides ruber sensu stricto δ 18 O minus Neogloboquadrina dutertrei δ 18 O (Δδ 18 O r–d ) were used to investigate changes in upper-ocean stratification. We reconstructed variations in mass accumulation rates (MARs) of CaCO 3 and biogenic silica (BSi) to discuss plankton community structure. Greater difference between Globigerinoides ruber sensu stricto δ 18 O and Neogloboquadrina dutertrei δ 18 O during the marine isotope stage (MIS) 1 and 5a indicate intervals with less saline and more stratified conditions. In contrast, the relatively small difference between both planktic foraminiferal δ 18 O during MIS 2 and 4 indicates diminished stratification during these periods. Elevated carbonate production during MIS 2 and 4, demonstrated by the increase in CaCO 3 MAR, could have been driven by lower freshwater influx to the western Bay of Bengal resulting from lower ISM precipitation, and thus the increased mixing and upwelling of deep nitrate into the photic zone. The relative increase in BSi MAR during periods of high ISM precipitation and decreased salinity of surface waters suggests a limited recovery in biological siliceous production under interglacial conditions, possibly due to enhanced fluvial SiO 4 delivery to the ocean. Fluctuations of Δδ 18 O r–d during MIS 3 indicate that freshwater stratification was moderate and insufficient to restrict upwelling. This might have induced moderate biogenic silica and carbonate productions during this period. © 2019 Elsevier B.V.
英文关键词	Bay of Bengal; Biogeochemical data; Planktonic δ 18 O; Sediment record
语种	英语
scopus关键词	biogenic deposit; biogeochemistry; biological production; community structure; interglacial; marine isotope stage; marine sediment; monsoon; oxygen isotope; plankton; planktonic foraminifera; reconstruction; sediment core; stratification; temporal variation; upwelling; water column; Bay of Bengal; India; Indian Ocean; Globigerinoides ruber; Neogloboquadrina dutertrei
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151004
作者单位	Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8564, Japan; Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Tokyo, 113-0033, Japan; Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan; Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima, Yokosuka, Kanagwawa 237-0061, Japan; National Institute of Technology, Ibaraki College, 866 Nakane, Hitachinaka, Ibaraki 312-8508, Japan; Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan
推荐引用方式 GB/T 7714	Ota Y.,Kuroda J.,Yamaguchi A.,等. Monsoon-influenced variations in plankton community structure and upper-water column stratification in the western Bay of Bengal during the past 80 ky[J],2019,521.
APA	Ota Y..,Kuroda J..,Yamaguchi A..,Suzuki A..,Araoka D..,...&NGHP Expedition 02 JAMSTEC Science Team.(2019).Monsoon-influenced variations in plankton community structure and upper-water column stratification in the western Bay of Bengal during the past 80 ky.Palaeogeography, Palaeoclimatology, Palaeoecology,521.
MLA	Ota Y.,et al."Monsoon-influenced variations in plankton community structure and upper-water column stratification in the western Bay of Bengal during the past 80 ky".Palaeogeography, Palaeoclimatology, Palaeoecology 521(2019).