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首页> 外文期刊>Journal of oceanography >Temporal Trends in Apparent Oxygen Utilization in the Upper Pycnocline of the North Pacific: 1980-2000
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Temporal Trends in Apparent Oxygen Utilization in the Upper Pycnocline of the North Pacific: 1980-2000

机译：北太平洋上碧萝y的表观氧气利用的时间趋势：1980-2000

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摘要

We present a compilation of apparent oxygen utilization (AOU) changes observed in the upper pycnocline of the North Pacific Ocean over the last several decades. The goal here is to place previously-published data in a common format, and assess the causes of the observed changes. The general trend along repeat cross sections of the eastern and western subtropical ocean and the subarctic ocean is an increase in AOU from the mid 1980s to the mid 1990s. AOU has also been increasing in a time-series study in the northwest subarctic Ocean off of Japan since the late 1960s. Observed AOU changes south of 35°N in the subtropical ocean are 10-20 μmol kg~(-1), with much greater changes, reaching 60-80 μmol kg~(-1) in isolated areas, in the subtropical/ subarctic boundary and the subarctic ocean. Analysis of changes in both AOU and salinity on isopycnals suggests that there are significant salinity-normalized increases that must be due to alteration in the rate of ventilation or organic matter degradation. A common feature in the data is that the maximum increase in AOU is centered near the density horizon σ_θ = 26.6. Time series results from the Oyashio Current region near the winter outcrop area of this density horizon indicate that surface waters there have become fresher with time, which may mean this density surface has ceased to outcrop in the latter decades of the 20th century. Whether this is due to natural decadal-scale changes or anthropogenic influences can be decided by determining future trends in AOU on these density surfaces.
机译：我们提供了过去几十年来在北太平洋上环比诺克林中观察到的表观氧气利用率（AOU）变化的汇编。此处的目标是将以前发布的数据以通用格式放置，并评估观察到的变化的原因。东部和西部亚热带海洋和北极的重复剖面的总体趋势是，从1980年代中期到1990年代中期，AOU有所增加。自1960年代后期以来，在日本以外的西北北极海域的时间序列研究中，AOU也一直在增加。亚热带海洋在35°N以南的观测到的AOU变化为10-20μmolkg〜（-1），在亚热带/亚北极边界的偏远地区，变化更大，达到60-80μmolkg〜（-1）。和北极海洋。对等渗物的AOU和盐度变化的分析表明，盐度标准化显着增加必须归因于通气速率或有机物降解速率的变化。数据的一个共同特征是AOU的最大增加集中在密度水平σ_θ= 26.6附近。 Oyashio Current地区靠近该密度层的冬季露头区域的时间序列结果表明，随着时间的推移，那里的地表水变得更新鲜，这可能意味着该密度地表在20世纪后期才停止露头。可以通过确定这些密度表面上AOU的未来趋势来确定这是由于自然年代尺度变化还是人为影响。

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