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首页> 外文期刊>Journal of oceanography >Influence of Coupled Rossby Waves on Primary Productivity and Tuna Abundance in the Indian Ocean
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Influence of Coupled Rossby Waves on Primary Productivity and Tuna Abundance in the Indian Ocean

机译：Rossby波耦合对印度洋初级生产力和金枪鱼丰度的影响

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Interannual coupled Rossby waves in the extratropical Indian Ocean propagate westward in covarying pycnocline depth, sea surface temperature, and meridional surface wind anomalies from the west coast of Australia between 15°S and 35°S, taking 3-4 years to transit the interior ocean to Madagascar. In the interior subtropical gyre, where the tuna longline catch (TLC) mainly concerns two species (albacore and bigeye), these waves have been observed to affect year-to-year changes in catch, with wave crests (troughs) in the main pycnocline associated with high (low) TLC anomalies. This suggested that tuna longline catch is associated with the entrainment of nutrient-rich pycnocline water into the photic zone and a subsequent increase in primary productivity there. Here, this hypothesis is examined within the context of SeaWiFS chlorophyll concentration (CC). We find the situation the opposite of that expected, with wave crests (troughs) in the main pycnocline associated with low (high) CC anomalies averaged over the photic zone. These results are shown to be consistent with a model relating the anomalous CC tendency to upper-layer divergence in the wave, not unlike that relating surface slicks to upper-layer divergence in internal gravity waves. Thus, the connection between interannual coupled Rossby waves and TLC in the interior subtropical gyre does not appear to derive from wave-induced modulation of the pelagic food web.
机译：来自温带印度洋的年际耦合Rossby波在15°S到35°S之间的澳大利亚西海岸，在变温线深，海面温度和子午面风向异常的情况下向西传播，需要3-4年的时间才能穿越内部海洋去马达加斯加。在内部亚热带回旋区中，金枪鱼延绳钓渔获主要涉及两种物种（长鳍金枪鱼和大眼金枪鱼），据观察，这些波浪影响渔获量的逐年变化，主要比索克林具有波峰（波谷）。与高（低）TLC异常相关。这表明金枪鱼延绳钓捕捞与将营养丰富的比可可林水夹带到光合作用区以及随后该地区初级生产力的提高有关。在此，在SeaWiFS叶绿素浓度（CC）的背景下检验了这一假设。我们发现这种情况与预期的相反，主要比诺克星中的波峰（波谷）与在光区的平均低（高）CC异常相关。这些结果显示与将异常CC趋势与波浪中的上层发散相关的模型相一致，这与将表面浮油与内部重力波中的上层发散相关的模型不同。因此，年内耦合的Rossby波与内部亚热带回旋中的TLC之间的联系似乎并非源于中上层食物网的波致调制。

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