The role of surface heat fluxes in tropical intraseasonal oscillations
The role of surface heat fluxes in tropical intraseasonal oscillations
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DOI：
10.1038/ngeo312
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发表时间：
2008-10-01
影响因子：
18.3
通讯作者：
Frierson, Dargan M.
中科院分区：
文献类型：
--
作者：
Sobel, Adam H.;Maloney, Eric D.;Frierson, Dargan M.
在季节内（30-60天）时间尺度上，热带地区的风和降水持续强烈、连贯的变化。在其活跃阶段，这些季节内振荡的特点是缓慢向东移动的强于平均水平的降水和西风。在北方夏季，降雨和风异常也在印度、东南亚和东亚以及邻近海洋的季节内时间尺度上向北传播，调节季风的活跃和中断周期，从而直接控制依赖雨养农业的大量人口的生计。我们认为，从海洋到大气的热通量在驱动季节内振荡中起着根本性的作用。我们还建议，目前这一代的数值模式，使我们能够测试这一点和其他假设的动力学的季节内振荡更令人信服的比过去已经做了。
The tropics sustain strong, coherent variations in wind and precipitation on the intraseasonal (30-60 day) timescale. In their active phases, these intraseasonal oscillations are characterized by the slow eastward movement of stronger-than-average precipitation and westerly winds. In northern summer, rainfall and wind anomalies also propagate northward on the intraseasonal timescale over India, southeast and east Asia and the adjacent oceans, pacing the active and break cycles of the monsoons and thus exerting a direct control on the livelihoods of large populations dependent on rain-fed agriculture. We argue that heat fluxes from ocean to atmosphere play a fundamental role in driving the intraseasonal oscillations. We also propose that the current generation of numerical models may enable us to test this and other hypotheses about the dynamics of intraseasonal oscillations more convincingly than has been done in the past.