Tropical Intraseasonal Variability in 14 IPCC AR4 Climate Models. Part I: Convective Signals
Tropical Intraseasonal Variability in 14 IPCC AR4 Climate Models. Part I: Convective Signals
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DOI：
10.1175/jcli3735.1
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发表时间：
2006-06
影响因子：
4.9
通讯作者：
Jialin Lin;G. Kiladis;B. Mapes;K. Weickmann;K. Sperber;Wuyin Lin;M. Wheeler;S. Schubert;A. Geni
中科院分区：
文献类型：
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作者：
Jialin Lin;G. Kiladis;B. Mapes;K. Weickmann;K. Sperber;Wuyin Lin;M. Wheeler;S. Schubert;A. Geni
摘要本研究评估了参加政府间气候变化专门委员会（IPCC）第四次评估报告（AR 4）的14个耦合大气环流模式（GCMs）的热带季节内变率，特别是Madden-Julian振荡（MJO）模拟的保真度。分析了每个模式20世纪气候模拟的8年日降水量，并与卫星反演的日降水量进行了比较。时空谱分析用于获得主要对流耦合赤道波的方差和相速度，包括MJO，开尔文，赤道Rossby（ER），混合Rossby重力（MRG），和东向惯性重力（EIG）和向西向惯性重力（WIG）波。本文详细分析了MJO的变化和传播，MJO定义为向东波数1-6，30-70天模态。结果表明，目前最先进的大气环流模式在模拟热带季节内变化方面仍存在明显的问题，并显示出广泛的技能。
Abstract This study evaluates the tropical intraseasonal variability, especially the fidelity of Madden–Julian oscillation (MJO) simulations, in 14 coupled general circulation models (GCMs) participating in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4). Eight years of daily precipitation from each model’s twentieth-century climate simulation are analyzed and compared with daily satellite-retrieved precipitation. Space–time spectral analysis is used to obtain the variance and phase speed of dominant convectively coupled equatorial waves, including the MJO, Kelvin, equatorial Rossby (ER), mixed Rossby–gravity (MRG), and eastward inertio–gravity (EIG) and westward inertio–gravity (WIG) waves. The variance and propagation of the MJO, defined as the eastward wavenumbers 1–6, 30–70-day mode, are examined in detail. The results show that current state-of-the-art GCMs still have significant problems and display a wide range of skill in simulating the tropical intraseasonal va...