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DOI	10.5194/bg-17-6051-2020
	Reviews and syntheses: Present, past, and future of the oxygen minimum zone in the northern Indian Ocean
	Rixen, Tim; Cowie, Greg; Gaye, Birgit; Goes, Joaquim; Gomes, Helga do Rosario; Hood, Raleigh R.; Lachkar, Zouhair; Schmidt, Henrike; Segschneider, Joachim; Singh, Arvind
通讯作者	Rixen, T
来源期刊	BIOGEOSCIENCES
ISSN	1726-4170
EISSN	1726-4189
出版年	2020
卷号	17 期号:23 页码:6051-6080
英文摘要	Decreasing concentrations of dissolved oxygen in the ocean are considered one of the main threats to marine ecosystems as they jeopardize the growth of higher organisms. They also alter the marine nitrogen cycle, which is strongly bound to the carbon cycle and climate. While higher organisms in general start to suffer from oxygen concentrations < similar to 63 mu M (hypoxia), the marine nitrogen cycle responds to oxygen concentration below a threshold of about 20 mu M (microbial hypoxia), whereas anoxic processes dominate the nitrogen cycle at oxygen concentrations of < similar to 0.05 mu M (functional anoxia). The Arabian Sea and the Bay of Bengal are home to approximately 21 % of the total volume of ocean waters revealing microbial hypoxia. While in the Arabian Sea this oxygen minimum zone (OMZ) is also functionally anoxic, the Bay of Bengal OMZ seems to be on the verge of becoming so. Even though there are a few isolated reports on the occurrence of anoxia prior to 1960, anoxic events have so far not been reported from the open northern Indian Ocean (i.e., other than on shelves) during the last 60 years. Maintenance of functional anoxia in the Arabian Sea OMZ with oxygen concentrations ranging between > 0 and similar to 0.05 mu M is highly extraordinary considering that the monsoon reverses the surface ocean circulation twice a year and turns vast areas of the Arabian Sea from an oligotrophic oceanic desert into one of the most productive regions of the oceans within a few weeks. Thus, the comparably low variability of oxygen concentration in the OMZ implies stable balances between the physical oxygen supply and the biological oxygen consumption, which includes negative feedback mechanisms such as reducing oxygen consumption at decreasing oxygen concentrations (e.g., reduced respiration). Lower biological oxygen consumption is also assumed to be responsible for a less intense OMZ in the Bay of Bengal. According to numerical model results, a decreasing physical oxygen supply via the inflow of water masses from the south intensified the Arabian Sea OMZ during the last 6000 years, whereas a reduced oxygen supply via the inflow of Persian Gulf Water from the north intensifies the OMZ today in response to global warming. The first is supported by data derived from the sedimentary records, and the latter concurs with observations of decreasing oxygen concentrations and a spreading of functional anoxia during the last decades in the Arabian Sea. In the Arabian Sea decreasing oxygen concentrations seem to have initiated a regime shift within the pelagic ecosystem structure, and this trend is also seen in benthic ecosystems. Consequences for biogeochemical cycles are as yet unknown, which, in addition to the poor representation of mesoscale features in global Earth system models, reduces the reliability of estimates of the future OMZ development in the northern Indian Ocean.
类型	Review
语种	英语
开放获取类型	gold, Green Accepted, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000598098000001
WOS关键词	PARTICULATE ORGANIC-CARBON ; ARABIAN SEA DENITRIFICATION ; DRIVEN BIOLOGICAL PUMP ; HARMFUL ALGAL BLOOMS ; SOUTHWEST MONSOON ; TROPICAL PACIFIC ; SURFACE-TEMPERATURE ; COMMUNITY STRUCTURE ; ATMOSPHERIC CO2 ; NITROGEN LOSS
WOS类目	Ecology ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327889
作者单位	[Rixen, Tim] Leibniz Ctr Trop Marine Res ZMT, Fahrenheitstr 6, D-28359 Bremen, Germany; [Cowie, Greg] Univ Edinburgh, Sch Geosci, James Hutton Rd, Edinburgh EH9 3FE, Midlothian, Scotland; [Gaye, Birgit] Univ Hamburg, Inst Geol, Bundesstr 55, D-20146 Hamburg, Germany; [Goes, Joaquim; Gomes, Helga do Rosario] Columbia Univ, Dept Marine Biol & Paleoenvironm, Lamont Doherty Earth Observ, Marine Biol, 61 Route 9W, Palisades, NY 10964 USA; [Hood, Raleigh R.] Univ Maryland, Horn Point Lab, Ctr Environm Sci, POB 775, Cambridge, MD 21613 USA; [Lachkar, Zouhair] NYU, Ctr Prototype Climate Modeling CPCM, Abu Dhabi, U Arab Emirates; [Schmidt, Henrike] GEOMAR Helmholtz Zentrum Ozeanforsch Kiel, Duesternbrooker Weg 20, D-24105 Kiel, Germany; [Segschneider, Joachim] Christian Albrechts Univ Kiel CAU, Inst Geosci, Ludewig Meyn Str 10, D-24118 Kiel, Germany; [Singh, Arvind] Phys Res Lab PRL Navrangpura, Geosci Div, Ahmadabad 380009, Gujarat, India
推荐引用方式 GB/T 7714	Rixen, Tim,Cowie, Greg,Gaye, Birgit,et al. Reviews and syntheses: Present, past, and future of the oxygen minimum zone in the northern Indian Ocean[J],2020,17(23):6051-6080.
APA	Rixen, Tim.,Cowie, Greg.,Gaye, Birgit.,Goes, Joaquim.,Gomes, Helga do Rosario.,...&Singh, Arvind.(2020).Reviews and syntheses: Present, past, and future of the oxygen minimum zone in the northern Indian Ocean.BIOGEOSCIENCES,17(23),6051-6080.
MLA	Rixen, Tim,et al."Reviews and syntheses: Present, past, and future of the oxygen minimum zone in the northern Indian Ocean".BIOGEOSCIENCES 17.23(2020):6051-6080.