DOI: 10.1029/2018JG004447
Scopus记录号: 2-s2.0-85050478804
论文题名: Ventilation of Oxygen to Oxygen Minimum Zone Due to Anticyclonic Eddies in the Bay of Bengal
作者: Sarma V.V.S.S. ; Udaya Bhaskar T.V.S.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 7 起始页码: 2145
结束页码: 2153
语种: 英语
英文关键词: anticyclonic eddy
; Bay of Bengal
; dissolved oxygen
; oxygen minimum zone
; ventilation
Scopus关键词: Bacteria (microorganisms)
英文摘要: Intense oxygen minimum zone (OMZ) occurs in the middepth of the Eastern Tropical Pacific (ETP), Arabian Sea (AS), and Bay of Bengal (BoB). However, the occurrence of anammox/denitrification was reported only in the ETP and AS and its absence in the BoB is attributed to presence of traces of dissolved oxygen (DO). Anticyclonic eddies (ACEs) supply high-nutrient, organic-rich, and oxygen-poor waters from the coastal upwelling regions leading to strengthening of OMZ in the offshore of AS and ETP. In the absence of western boundary upwelling, we hypothesize that the ACEs supply DO-rich water leading to weakening of OMZ in the BoB. Six ACEs were sampled by bio-argo floats and measured in situ hydrography and DO. All sampled eddies were formed in the eastern BoB, close to Andaman Sea, and moved toward west. Warm and DO-rich waters were observed in the core of OMZ (150–300 m), influenced by ACEs, by 0.5–1.46°C and 3.2–6.5 μM, respectively, than no eddy region in the BoB. Based on the mean lifetime of ACE, the rate of ventilation in the 100–300 m was estimated to be 0.07 ± 0.02 μmol/L/day, which is 3 to 4 times higher than bacterial respiration rates (0.02 μmol/L/day). Concerns of OMZ intensification leading to denitrification/anammox conditions in the BoB have been expressed, but with several ACEs forming in time and space in the BoB the denitrification occurrence is unlikely. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113652
Appears in Collections: 气候减缓与适应
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作者单位: National Institute of Oceanography, Regional Centre, Visakhapatnam, India; Indian National Center for Ocean Information Services, Ministry of Earth Sciences, Pragathi Nagar, India
Recommended Citation:
Sarma V.V.S.S.,Udaya Bhaskar T.V.S.. Ventilation of Oxygen to Oxygen Minimum Zone Due to Anticyclonic Eddies in the Bay of Bengal[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(7)