The Role of Tropical–Extratropical Interaction and Synoptic Variability in Maintaining the South Pacific Convergence Zone in CMIP5 Models
The Role of Tropical–Extratropical Interaction and Synoptic Variability in Maintaining the South Pacific Convergence Zone in CMIP5 Models
复制标题
热带-温带相互作用和天气变化在 CMIP5 模型中维持南太平洋辐合带中的作用
DOI：
10.1175/jcli-d-14-00527.1
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发表时间：
2015
影响因子：
4.9
通讯作者：
M. Widlansky
中科院分区：
文献类型：
--
作者：
M. J. Niznik;B. Lintner;A. Matthews;M. Widlansky
摘要在包括耦合模式比对项目（CMIP5）第5阶段气候模式在内的当代气候模式中，南太平洋辐合带（SPCZ）被模拟为太区域性的一个特征。这种纬向偏压引起热带对流加热的误差，对全球环流产生后续影响。spccz结构，特别是在亚热带地区，是由瞬变天气系统和平均背景态之间的热带-温带相互作用所控制的。本研究对模拟的亚热带SPCZ的天气变率分析表明，热带-温带相互作用的基本机制通常被很好地模拟，风暴沿着与观测相似的轨迹接近SPCZ。然而，平均降水及其变率在CMIP5整体中存在广泛的分布。模式间传播似乎与天气波传播的偏背景状态有关。特别是，平均负向拉伸区域。
AbstractThe South Pacific convergence zone (SPCZ) is simulated as too zonal a feature in the current generation of climate models, including those in phase 5 of the Coupled Model Intercomparison Project (CMIP5). This zonal bias induces errors in tropical convective heating, with subsequent effects on global circulation. The SPCZ structure, particularly in the subtropics, is governed by the tropical–extratropical interaction between transient synoptic systems and the mean background state. In this study, analysis of synoptic variability in the simulated subtropical SPCZ reveals that the basic mechanism of tropical–extratropical interaction is generally well simulated, with storms approaching the SPCZ along comparable trajectories to observations. However, there is a broad spread in mean precipitation and its variability across the CMIP5 ensemble. Intermodel spread appears to relate to a biased background state in which the synoptic waves propagate. In particular, the region of mean negative zonal stretchin...
影响因子：
5.2
作者：
S. Borlace;A. Santoso;W. Cai;M. Collins
通讯作者：
S. Borlace;A. Santoso;W. Cai;M. Collins
影响因子：
4.4
作者：
Sillmann, J.;Kharin, V. V.;Bronaugh, D.
通讯作者：
Bronaugh, D.