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首页> 外文期刊>Journal of the Atmospheric Sciences >The tropical dynamical response to latent heating estimates derived from the TRMM precipitation radar
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The tropical dynamical response to latent heating estimates derived from the TRMM precipitation radar

机译：TRMM降水雷达对潜热估算的热带动力响应

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摘要

A 3-yr (1998-2000) climatology of near-surface rainfall and stratiform rain fraction observed by the Tropical Rainfall Measuring Mission (TRMM) precipitation radar ( PR) was used to calculate the four-dimensional distribution of tropical latent heating on seasonal-to-annual time scales. The TRMM-derived latent heating was then used to force an idealized primitive equation model using an initial value approach in order to obtain the quasi-steady-state, nonlinear, zonally asymmetric atmospheric response to precipitating tropical cloud systems. In agreement with previous studies, an increase in stratiform rain fraction elevates circulation centers and strengthens the upper-level response. Furthermore, horizontal variations in the vertical heating profile implied by the PR stratiform rain fraction pattern lead to circulation anomalies of varying height and vertical extent that are not present when the model is forced with a vertically uniform heating field. During El Nino, the trans-Pacific gradient in stratiform rain fraction that is normally present becomes more pronounced and the model response becomes even more sensitive to the horizontal variability of the latent heating vertical structure. When the heating field is modified to take into account the effects of nonprecipitating cumulus and cloud radiative forcing within the regions of tropical precipitating cloud systems, the overall pattern of the model response to the TRMM-derived latent heating is reinforced, as is the model's sensitivity to the variability in the latent heating vertical structure.
机译：使用热带雨量测量任务（TRMM）降水雷达（PR）观测到的近3年（1998-2000年）近地表气候和层状雨分数的气候来计算季节性潜伏期热带潜热的三维分布。年度时间尺度。然后，使用TRMM衍生的潜热使用初始值方法来强制理想化的原始方程模型，以获得对降水热带云系统的准稳态，非线性，区域不对称的大气响应。与之前的研究一致，层状降雨分数的增加提高了循环中心并增强了高层响应。此外，PR层状雨分数模式所隐含的垂直加热剖面中的水平变化会导致高度和垂直范围变化的循环异常，而当模型在垂直方向上均匀加热时，则不会出现这种异常。在厄尔尼诺现象期间，通常存在的层状降雨分数的跨太平洋梯度变得更加明显，并且模型响应对潜热垂直结构的水平变化变得更加敏感。当修改加热场以考虑热带降水云系统区域内非降水积云和云辐射强迫的影响时，模型对TRMM衍生潜热的响应的整体模式将得到增强，模型的敏感性也会得到增强潜热垂直结构的可变性。

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