剪切方向和热带气旋的形成之间的关系——地球科学堆栈交换江南电子竞技平台江南体育网页版 最近30从www.hoelymoley.com 2023 - 07 - 07 - t14:05:54z //www.hoelymoley.com/feeds/question/2803 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/2803 12 剪切方向和热带气旋的形成之间的关系 gansub //www.hoelymoley.com/users/1066 2014 - 11 - 15 - t07:37:58z 2019 - 02 - 25 - t05:22:17z < p >在前面的问题/答案< a href = " //www.hoelymoley.com/questions/2790/why-are-there-no-hurricanes-in-the-southern-atlantic-basin " >为什么没有飓风在南大西洋流域< / >有一点提高剪切方向(教唆/减速)气旋的形成。似乎西风剪切阻碍了热带气旋的形成和东风切变起到了促进的作用。这应该意味着气旋的形成是在季风区域只允许。这是准确的吗?从本文——< a href = " http://www.cwb.gov.tw/V7/climate/climate_info/information/lectures/14/Lecture_1_Wave_and_Response.pdf " rel = " nofollow noreferrer " >热带波动态和Heatinduced稳定响应< / >。< / p > < p >似乎在西风剪切罗斯比波大的振幅在对流层上部而在东风切变罗斯比波振幅低对流层。考虑到赤道热带气旋的前驱波可以在这方面提供了一个澄清吗?< / p > //www.hoelymoley.com/questions/2803/-/3159 # 3159 7 答案为等密度线振荡剪切方向和热带气旋的形成之间的关系 等密度线振荡 //www.hoelymoley.com/users/200 2014 - 12 - 30 - t06:48:07z 2014 - 12 - 30 - t06:48:07z < p >的方向垂直剪切在风暴之发展形成中起着很大的作用,在东风切变加强赛昂的形成和西风剪切会抑制它(< a href = " http://tinyurl.com/lbn7t65 " rel = " nofollow noreferrer " > Tuleya两和栗原市,1981 < / >)。< / p > < p >内波负责大型的超远距离传输的能量。因此,他们扮演了一个重要的角色在一个广泛的空气的(和海洋)的过程,如热带气旋生成(TC)。这些波能够沉积能量在一个已经创建活跃的地区。这种能量可能体现在东风切变的形式。根据波的类型,有证据表明,一些波引发风暴之发展形成中发挥重要作用。< / p >

It has been known for decades that about half of the hurricanes in the North Atlantic form from African waves (e.g., Frank and Clark 1980), and there have been many studies of this type of genesis (e.g., Carlson, 1969; Landsea, 1993; Thorncroft and Hodges, 2001; and others). Molinari and Vollaro (2000), Mal- oney and Hartmann (2001), Liebmann et al. (1994).

There are three main classes of equatorial internal waves to consider when it comes to TC. Namely, the MJO, equatorial Rossby (ER) waves and other large wavenumber, high frequency waves that propagate towards the west (mixed Rossby gravity waves). Note that equatorial Kelvin waves are thought to have little effect on cyclogenesis. This animation from NOAA shows the internal waves (as OLR anomalies) over a period of 40 days: internal waves

Specifically:

  • the MJO and ER waves produce easterly shear anomaly at the generation location, while the MJO tends to reduce westerly shear over the atlantic.

the MJO enhances both the convergence and the low-level rotation at the genesis location. [...] shows a tendency for the MJO to cause easterly vertical shear anomalies at the genesis location in most basins, and this would tend to be favorable for storm formation. [...] The ER waves also appear to enhance genesis by increasing both the large-scale rotation and convection, as in this band the storms form within the low-level cyclonic gyre and about two days after the wave’s convective anomaly first reaches the genesis point. The ER waves also cause significant easterly shear anomalies at the genesis locations in about half of the basins.

Basically, internal waves enhance the formation of cyclones by increasing the vorticity of the local flow.

References:

Anantha R. Aiyyer and Chris Thorncroft, 2006: Climatology of Vertical Wind Shear over the Tropical Atlantic. J. Climate, 19, 2969–2983.

Tuleya, Robert E., and Yoshio Kurihara. "A numerical study on the effects of environmental flow on tropical storm genesis." Monthly Weather Review 109.12 (1981): 2487-2506.

William M. Frank and Paul E. Roundy, 2006: The Role of Tropical Waves in Tropical Cyclogenesis. Mon. Wea. Rev., 134, 2397–2417.

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