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An Assessment of the Seasonal Salinity Budget for the Upper Bay of Bengal

机译：孟加拉上海湾的季节性盐度预算评估

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摘要

During each summer monsoon, the Bay of Bengal is inundated by a large amount of rain and river discharge. The effects of this freshening are gradually reversed over the course of the year, with near-surface salinities typically returning to their presummer monsoon levels before the start of the next rainy season. While the forcing responsible for the summertime freshening is clear, the processes that act to restore the bay's salinity are not well understood. To examine these processes, the authors construct a basin-integrated, near-surface, seasonal salinity budget using data-assimilated output from the Hybrid Coordinate Ocean Model (HYCOM). From this salinity budget, it is deduced that vertical salt fluxes are primarily responsible for counterbalancing the near-surface freshening caused by the summertime freshwater fluxes. These vertical salt fluxes are largest during the months that immediately follow the summer monsoon, when the near-surface halocline is strongest. These results must be tempered with the knowledge that HYCOM misrepresents some key features of the bay's salinity field. In particular, the model tends to overestimate salinity along the East Indian Coastal Current during its equatorward phase. Notwithstanding these biases, these results still suggest that vertical processes have a prominent role in the bay's near-surface salinity budget.
机译：在每个夏季风期间，孟加拉湾被大量的雨水和河水淹没。在一年的过程中，这种新鲜感的影响逐渐消失，近地表盐度通常在下一个雨季开始之前恢复到其夏季季风水平。尽管造成夏季清新的强迫因素很明显，但恢复海湾盐度的过程仍未得到很好的理解。为了研究这些过程，作者使用混合坐标海洋模型（HYCOM）的数据辅助输出构造了一个盆地综合的近地表季节性盐度预算。从盐度预算中可以推断出，垂直盐通量主要用于平衡由夏季淡水通量引起的近地表新鲜化。这些垂直盐通量在夏季季风之后的几个月中最大，这时近地表卤水最强。这些结果必须在认识到HYCOM误解了海湾盐度领域的一些关键特征的前提下加以调整。特别是，该模型倾向于在赤道阶段高估东印度洋沿岸的盐度。尽管存在这些偏见，但这些结果仍然表明，垂直过程在海湾近地表盐度预算中起着重要作用。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第5期|1361-1376|共16页
  • 作者

    Wilson Earle A.; Riser Stephen C.;

  • 作者单位

    Univ Washington, Sch Oceanog, Box 357940, Seattle, WA 98195 USA;

    Univ Washington, Sch Oceanog, Box 357940, Seattle, WA 98195 USA;

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