Reorganization of tropical climate during El Niño : A weak temperature gradient approach
Reorganization of tropical climate during El Niño : A weak temperature gradient approach
复制标题
厄尔尼诺期间热带气候的重组：弱温度梯度方法
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Chiang
中科院分区：
文献类型：
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作者：
B. Lintner;J. Chiang
摘要 研究了弱温度梯度（WTG）公式在厄尔尼诺-南方涛动（ENSO）事件期间热带气候重组中的适用性。这种理想化的动力学框架通过假设空间均匀的扰动温度分布和应用于热带带的质量平衡约束来解决热带环流的发散部分。采用WTG假设配置的中等复杂性模型[准平衡热带环流模型（QTCM）]用于模拟厄尔尼诺条件，并发现可以产生适当水平的对流层变暖、厄尔尼诺热带太平洋源区降水异常的合理模式以及太平洋以外热带地区（以下简称“偏远热带地区”）的总降水赤字。在拉尼娜强迫条件和增强的温室气体浓度下对风力发电机组框架进行的额外测试支持了其适用性。然而，ENSO 回应...
Abstract The applicability of a weak temperature gradient (WTG) formulation for the reorganization of tropical climate during El Nino–Southern Oscillation (ENSO) events is investigated. This idealized dynamical framework solves for the divergent portion of the tropical circulation by assuming a spatially homogeneous perturbation temperature profile and a mass balance constraint applied over the tropical belt. An intermediate-level complexity model [the Quasi-Equilibrium Tropical Circulation Model (QTCM)] configured with the WTG assumptions is used to simulate El Nino conditions and is found to yield an appropriate level of tropospheric warming, a plausible pattern of precipitation anomalies in the tropical Pacific source region of El Nino, and a gross precipitation deficit over the Tropics outside the Pacific (hereafter the “remote Tropics”). Additional tests of the WTG framework with La Nina forcing conditions and enhanced greenhouse gas concentrations support its applicability. However, the ENSO respons...