Oxygen declines and the shoaling of the hypoxic boundary in the California Current

被引：316

作者：

Bograd, Steven J. ^{[1
]}

Castro, Carmen G. ^{[2
]}

Di Lorenzo, Emanuele ^{[4
]}

Palacios, Daniel M. ^{[1
,6
]}

Bailey, Helen ^{[1
]}

Gilly, William ^{[5
]}

Chavez, Francisco P. ^{[3
]}

机构：

[1] NOAA, SW Fisheries Sci Ctr, Div Environm Res, Pacific Grove, CA 93950 USA

[2] CSIC, Inst Invest Marinas, E-36208 Vigo, Spain

[3] Monterey Bay Aquarium Res Inst, Moss Landing, CA 95039 USA

[4] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[5] Stanford Univ, Hopkins Marine Stn, Pacific Grove, CA 93950 USA

[6] Univ Hawaii, Joint Inst Marine & Atmospher Res, Honolulu, HI 96822 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 12期

关键词：

D O I：

10.1029/2008GL034185

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We use hydrographic data from the California Cooperative Oceanic Fisheries Investigations program to explore the spatial and temporal variability of dissolved oxygen (DO) in the southern California Current System (CCS) over the period 1984-2006. Large declines in DO (up to 2.1 mu mol/kg/y) have been observed throughout the domain, with the largest relative DO declines occurring below the thermocline (mean decrease of 21% at 300 m). Linear trends were significant (p < 0.05) at the majority of stations down to 500 m. The hypoxic boundary (similar to 60 mu mol/kg) has shoaled by up to 90 m within portions of the southern CCS. The observed trends are consistent with advection of low-DO waters into the region, as well as decreased vertical oxygen transport following near-surface warming and increased stratification. Expansion of the oxygen minimum layer could lead to cascading effects on benthic and pelagic ecosystems, including habitat compression and community reorganization.

引用

页数：6

共 34 条

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