An anoxic Sea of Japan by the year 2200?
An anoxic Sea of Japan by the year 2200?
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DOI：
10.1016/s0304-4203(99)00074-2
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发表时间：
1999-11-01
期刊：
影响因子：
3
通讯作者：
Pavlova, GY
中科院分区：
文献类型：
--
作者：
Chen, CTA;Bychkov, AS;Pavlova, GY
日本海在许多时间尺度上都经历了底层水特性的波动。这些包括温度的升高和底部边界层厚度和氧浓度的降低。这种时间变化被认为是短暂的，可能是最近日本海北方新的底层水形成减少或停止造成的。这样的事件确实发生在末次冰期，当时日本海变得缺氧，直到全新世早期才再次变得好氧。这项研究表明，一个明显的停滞至少早在1950年就开始了，它仍然在继续。温度的上升与热流数据是一致的。计算结果还表明，自表观停滞开始以来的耗氧速率、磷酸盐和硝酸盐的再生速率与一维对流扩散模型和质量平衡模型计算的速率基本一致。这些速率平均为0.8 +/- 0.4 μ mol kg（-1）年（-1）的氧气，0.007 +/- 0.003 μ mol kg（-1）年（-1）的磷酸盐和0.10 +/- 0.04 μ mol kg（-1）年（-1）的硝酸盐。如果氧气消耗继续超过补充，日本海2000米以下很可能在180-530年后再次缺氧。(C)1999 Elsevier Science B. V.保留所有权利。
The Sea of Japan has experienced fluctuations in bottom-water properties over many time scales. These include increases in temperature and decreases in thickness of the bottom boundary layer and oxygen concentrations. Such temporal variations were thought to be transient and probably caused by a recent reduction or cessation of new bottom-water formation in the northern Sea of Japan. Such an event indeed occurred during the last glacial period when the Sea of Japan became anoxic, and it did not become oxic again until early in the Holocene. This study shows that an apparent stagnation started at least as early as 1950 and that it is still going on. The temperature increase is consistent with heat flow data. It also demonstrates that the estimated oxygen consumption rate and the phosphate and nitrate regeneration rates since the apparent stagnation began are in agreement with the rates calculated from one dimensional advection-diffusion and mass balance models. These rates average 0.8 +/- 0.4 mu mol kg(-1) year(-1) for oxygen, 0.007 +/- 0.003 mu mol kg(-1) year(-1) for phosphate and 0.10 +/- 0.04 mu mol kg(-1) year(-1) for nitrate. It is concluded that if the oxygen consumption continues to outpace replenishment, the Sea of Japan below 2000 m could very well become anoxic again 180-530 years from now. (C) 1999 Elsevier Science B.V. All rights reserved.