NDLI: The role of β-effect and a uniform current on tropical cyclone intensity

Content Provider	Springer Nature Link
Author	Duan, Yihong Wu, Rongsheng Yu, Hui Liang, Xudong Chan, Johnny C. L.
Copyright Year	2004
Abstract	A limited-area primitive equation model is used to study the role of the β-effect and a uniform current on tropical cyclone (TC) intensity. It is found that TC intensity is reduced in a non-quiescent environment compared with the case of no uniform current. On anf-plane, the rate of intensification of a tropical cyclone is larger than that of the uniform flow. A TC on a β-plane intensifies slower than one on anf-plane. The main physical characteristic that distinguishes the experiments is the asymmetric thermodynamic (including convective) and dynamic structures present when either a uniform flow or β-effect is introduced. But a fairly symmetric TC structure is simulated on anf-plane. The magnitude of the warm core and the associated subsidence are found to be responsible for such simulated intensity changes. On anf-plane, the convection tends to be symmetric, which results in strong upper-level convergence near the center and hence strong forced subsidence and a very warm core. On the other hand, horizontal advection of temperature cancels part of the adiabatic heating and results in less warming of the core, and hence the TC is not as intense. This advective process is due to the tilt of the vortex as a result of the β-effect. A similar situation occurs in the presence of a uniform flow. Thus, the asymmetric horizontal advection of temperature plays an important role in the temperature distribution. Dynamically, the asymmetric angular momentum (AM) flux is very small on anf-plane throughout the troposphere. However, the total AM exports at the upper levels for a TC either on a β-plane or with a uniform flow environment are larger because of an increase of the asymmetric as well as symmetric AM export on the plane at radii >450 km, and hence there is a lesser intensification.
Starting Page	75
Ending Page	86
Page Count	12
File Format	PDF
ISSN	02561530
Journal	Advances in Atmospheric Sciences
Volume Number	21
Issue Number	1
e-ISSN	18619533
Language	English
Publisher	Science Press
Publisher Date	2004-02-01
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	β-effect uniform current asymmetric structure tropical cyclone intensity change Atmospheric Sciences Meteorology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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