Chlorophyll Control of Surface Temperature in the Arabian Sea 

作成者 Frouin, R., Nakamoto, S.
日本十進分類法 (NDC) 452, 468
内容 研究概要:A general ocean circulation model is used to investigate the effect of solar radiation absorption by phytoplankton on surface temperature. The model, an updated version of Oberhuber's (1993) OPYC model, solves primitive equations, uses isopycnals as Lagrangian vertical coordinates, and includes a fully coupled mixed layer. The vertical profile of heating rate is parameterized as a function of remotely-sensed chlorophyll concentration. The model is run for 50 years without chlorophyll (control run) and an additional 10 years with chlorophyll (experimental run). The difference between experimental and control runs gives the biological effect. In January, sea surface temperature anomalies are positive in the northern hemisphere and negative in the southern hemisphere. In July, the opposite result is obtained. This suggests that, on a global scale, phytoplankton acts at moderating meridional temperature gradients. In the Arabian Sea, along a zonal strip centered at 20N, positive anomalies reaching 0.6K appear twice a year, from March through June and from September through November, and are associated with the two maxima of solar radiation over the annual cycle. The anomalies are smaller by 0.2K during the fall inter-monsoon season despite a 5-fold increase in chlorophyll abundance, because of reduced solar radiation. Increased chlorophyll during the southwest monsoon causes surface warming and sub-surface cooling consistent with JGOFS observations during the 1994-1995 Arabian Sea experiment.
コンテンツの種類 研究報告書 Research Paper
DCMI資源タイプ text
掲載誌情報 Proceedings of the international symposium on Ocean Color Remote Sensing and Carbon Flux page.72-72 (1999)
言語 英語

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