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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Observed subseasonal variability of heat flux and the SST response of the tropical Indian Ocean
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Observed subseasonal variability of heat flux and the SST response of the tropical Indian Ocean

机译：观测到的热带印度洋热通量的亚季节变化和海表温度响应

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摘要

We develop an experimental daily surface heat flux data set based on satellite observations to study subseasonal variability (periods shorter than 90 days) in the tropical Indian Ocean. We use incoming shortwave and longwave radiation from the International Satellite Cloud Climatology Project, and sea surface temperature (SST) from microwave sensors, to estimate net radiative flux. Latent and sensible heat fluxes are estimated from scatterometer winds and near-surface air temperature and specific humidity from Atmospheric Infrared Sounder (AIRS) observations calibrated to buoy data. Seasonal biases in net heat flux are generally within 10 W m~(-2) of estimates from moorings, and the phases and amplitudes of subseasonal variability of heat fluxes are realistic. We find that the contribution of subseasonal changes in air-sea humidity gradients to latent heat flux equals or exceeds the contribution of subseasonal changes in wind speed in all seasons. SST responds coherently to subseasonal oscillations of net heat flux associated with active and suppressed phases of atmospheric convection in the summer hemisphere. Thus, subseasonal SST changes are mainly forced by heat flux in the northeast Indian Ocean in northern summer, and in the 158S–58N latitude belt in southern summer. In the winter hemisphere, subseasonal SST changes are not a onedimensional response to heat flux, implying that they are mainly due to oceanic advection, entrainment, or vertical mixing. The coherent evolution of subseasonal SST variability and surface heat flux suggests active coupling between SST and large-scale, organized tropical convection in the summer season.
机译：我们根据卫星观测结果开发了一个实验性的每日表面热通量数据集，以研究热带印度洋的亚季节变化（短于90天的时间）。我们使用来自国际卫星云气候学项目的短波和长波辐射以及微波传感器的海面温度（SST）来估算净辐射通量。潜热通量和感热通量是根据散射仪的风，近地表空气温度和比湿度（根据校准为浮标数据的大气红外测深仪（AIRS）观测值）估算的。净热通量的季节性偏差通常在系泊设备估计值的10 W m〜（-2）以内，并且热通量的亚季节变化的相位和幅度是现实的。我们发现，在所有季节中，海-气湿度梯度的亚季节变化对潜热通量的贡献等于或超过风速的亚季节变化的贡献。在夏季半球，SST对净热通量的亚季节振荡做出了连贯的响应，而净热通量与大气对流的活跃和受抑制阶段有关。因此，夏季北半球海温的季节变化主要是由北部夏季印度洋东北部的热通量和南部夏季158S–58N纬度带的热通量引起的。在冬季半球，季节下海温的变化不是对热通量的一维响应，这表明它们主要是由于海洋平流，夹带或垂直混合造成的。夏季海温变化和表面热通量的连贯变化表明，夏季海温与大规模，有组织的热带对流之间存在主动耦合。

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