An estimation of water origins in the vicinity of a tropical cyclone’s center and associated dynamic processes
An estimation of water origins in the vicinity of a tropical cyclone’s center and associated dynamic processes
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DOI：
10.1007/s00382-017-3626-9
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发表时间：
2017
期刊：
影响因子：
4.6
通讯作者：
Toshinari Takakura;R. Kawamura;T. Kawano;K. Ichiyanagi;M. Tanoue;K. Yoshimura
中科院分区：
文献类型：
--
作者：
Toshinari Takakura;R. Kawamura;T. Kawano;K. Ichiyanagi;M. Tanoue;K. Yoshimura
为了阐明热带气旋中心附近水源的时间演变，我们在我们的案例研究中，使用同位素区域谱模式模拟了台风曼怡（2007年7月）。模式结果证实，随着热带气旋的发展和向北迁移，在西北太平洋上的水资源发生了连续的替换。结果表明，在这种情况下，气旋中心周围的总可降水量的一个显着的比例来自外部区域，而不是下垫面的海洋在成熟阶段的TC。类似的特征也可以在每种海洋成因占总凝结的比例中看到。印度洋、南海和海洋大陆水汽开始在发展阶段逐渐增加，并在TC接近日本西南部时达到最大值。这些遥远的海洋蒸汽通过水分输送带输送到气旋的东部，该输送带的特征在于从印度洋延伸到TC的独特的低层水分通量，并通过与次级环流相关的边界层内的流入进一步供应到TC的内部区域。由于这两个动力过程都需要时间，因此，在成熟阶段，远程海洋水汽对TC的延迟影响似乎变得明显。
To clarify the time evolution of water origins in the vicinity of a tropical cyclone (TC)’s center, we have simulated Typhoon Man-yi (July 2007) in our case study, using an isotopic regional spectral model. The model results confirm that the replacement of water origins occurs successively as the TC develops and migrates northward over the western North Pacific. It is confirmed that, in this case, a significant proportion of total precipitable water around the cyclone center comes from external regions rather than the underlying ocean during the mature stage of a TC. Similar features can also be seen in the proportion of each oceanic origin to total condensation. Indian Ocean, South China Sea, and Maritime Continent water vapors begin to increase gradually at the developing stage and reach their peak at the decay stage when the TC approaches southwestern Japan. These remote ocean vapors are transported to the east of the cyclone via the moisture conveyor belt, a zone characterized by distinct low-level moisture flux that stretches from the Indian Ocean to the TC, and are further supplied into the inner region of the TC by inflow within the boundary layer associated with its secondary circulation. Since it takes time to undergo these two dynamic processes, the delayed influence of remote ocean vapors on the TC appears to become evident during the mature stage.