Oxygen declines and the shoaling of the hypoxic boundary in the California Current
Oxygen declines and the shoaling of the hypoxic boundary in the California Current
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DOI：
10.1029/2008gl034185
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发表时间：
2008-06-28
影响因子：
5.2
通讯作者：
Chavez, Francisco P.
中科院分区：
文献类型：
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作者：
Bograd, Steven J.;Castro, Carmen G.;Chavez, Francisco P.
我们使用加州合作海洋渔业调查计划的水文数据来探索1984-2006年期间南加州洋流系统(CCS)中溶解氧(DO)的空间和时间变化。DO在整个区域都有较大的下降(最高可达2.1mU/kg/年)，最大的相对DO下降发生在温跃层以下(300m处平均下降21%)。在500米以下的大多数测站有显著的线性趋势(p<；0.05)。在CCS南部的部分区域内，低氧边界(类似于60µmol/kg)已经缩小到90m。观察到的趋势与低DO水进入该区域的平流以及在近地表变暖和层化增加后垂直氧气输送减少相一致。氧最低层的扩大可能导致对海底和远洋生态系统的级联影响，包括栖息地压缩和群落重组。
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.