A Survey of Statistical Relationships between Tropical Cyclone Genesis and Convectively Coupled Equatorial Rossby Waves
A Survey of Statistical Relationships between Tropical Cyclone Genesis and Convectively Coupled Equatorial Rossby Waves
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热带气旋成因与对流耦合赤道罗斯贝波之间统计关系的调查
DOI：
10.1007/s00376-021-1089-8
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发表时间：
2022-01
影响因子：
5.8
通讯作者：
Tan Zhemin
中科院分区：
文献类型：
--
作者：
Wang Shuguang;Fang Juan;Tang Xiaodong;Tan Zhemin
对流耦合的赤道Rossby波（ERW）调制热带海洋上的热带气旋活动。本研究使用长达40年的长波辐射（OLR）和TC最佳路径数据集，对全球主要TC盆地的季节内ERW和热带气旋生成（TCG）之间的统计关系进行了调查。利用经验正交函数分析方法，在不施加赤道对称性的情况下，从OLR异常中识别出季节内ERW。我们发现，向西传播的ERW是最显着的四个热带海洋盆地在夏季半球和ERW表现出类似的东北-西南（东南-西北）倾斜的相位线在北方（南）半球，与一个明显的极前进的波能量在大多数TC盆地。基于EOF的战争遗留爆炸物指数定量表明，战争遗留爆炸物显著调节TC的生成。战争遗留爆炸物的对流活跃（抑制）阶段与TCG发生的增加（减少）相一致。当战争遗留爆炸物传播经过气候TCG热点时，其对TCG的调制作用达到最大。因此，在热带气旋盆地中，热带气旋生成的总数量因战争遗留爆炸物阶段的不同而有很大差异。在北方夏季，西北太平洋、东北太平洋和北方印度洋的ERW-TCG关系显著。在南半球夏季，在南印度洋、澳大利亚-澳大利亚海盆和西南太平洋，ERW-TCG关系显著。然而，在大西洋主要的热带气候变化发展区，战争遗留爆炸物活动很弱;对大西洋热带气候变化的影响似乎不大。
Convectively coupled equatorial Rossby waves (ERW) modulate tropical cyclone activities over tropical oceans. This study presents a survey of the statistical relationship between intraseasonal ERWs and tropical cyclone genesis (TCG) over major global TC basins using four-decade-long outgoing longwave radiation (OLR) and TC best-track datasets. Intraseasonal ERWs are identified from the OLR anomalies using an empirical orthogonal function (EOF) analysis method without imposing equatorial symmetry. We find that westward-propagating ERWs are most significant in four tropical ocean basins over the summer hemisphere and that ERWs exhibit similar northeast-southwest (southeast-northwest) tilted phase lines in the northern (southern) hemisphere, with an appreciable poleward advance of wave energy in most TC basins. The EOF-based ERW indices quantitatively show that ERWs significantly modulate TC genesis. The convectively active (suppressed) phases of ERWs coincide with increased (reduced) TCG occurrences. The TCG modulation by ERWs achieves the maximum where the ERWs propagate through the climatological TCG hotspots. As a result, the total number of TCG occurrences in the TC basins varies significantly according to the ERW phase. The ERW-TCG relationship is significant over the northwestern Pacific Ocean, northeastern Pacific Ocean, and the northern Indian Ocean during the northern summer seasons. In the southern summer season, the ERW-TCG relationship is significant over the southern Indian Ocean, Indonesian-Australia basin, and the southwestern Pacific Ocean. However, ERW activities are weak in the main TC development region of the Atlantic Ocean; and the impact on Atlantic TCG appears to be insignificant.
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