Scopus记录号: 2-s2.0-85046020931
论文题名: Tropical cyclogenesis in warm climates simulated by a cloud-system resolving model
作者: Fedorov A.V. ; Muir L. ; Boos W.R. ; Studholme J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2019
卷: 52, 期: 2019-01-02 起始页码: 107
结束页码: 127
语种: 英语
英文关键词: Atmospheric modeling
; Climate change
; Paleoclimate
; Tropical cyclones
英文摘要: Here we investigate tropical cyclogenesis in warm climates, focusing on the effect of reduced equator-to-pole temperature gradient relevant to past equable climates and, potentially, to future climate change. Using a cloud-system resolving model that explicitly represents moist convection, we conduct idealized experiments on a zonally periodic equatorial β-plane stretching from nearly pole-to-pole and covering roughly one-fifth of Earth’s circumference. To improve the representation of tropical cyclogenesis and mean climate at a horizontal resolution that would otherwise be too coarse for a cloud-system resolving model (15 km), we use the hypohydrostatic rescaling of the equations of motion, also called reduced acceleration in the vertical. The simulations simultaneously represent the Hadley circulation and the intertropical convergence zone, baroclinic waves in mid-latitudes, and a realistic distribution of tropical cyclones (TCs), all without use of a convective parameterization. Using this model, we study the dependence of TCs on the meridional sea surface temperature gradient. When this gradient is significantly reduced, we find a substantial increase in the number of TCs, including a several-fold increase in the strongest storms of Saffir–Simpson categories 4 and 5. This increase occurs as the mid-latitudes become a new active region of TC formation and growth. When the climate warms we also see convergence between the physical properties and genesis locations of tropical and warm-core extra-tropical cyclones. While end-members of these types of storms remain very distinct, a large distribution of cyclones forming in the subtropics and mid-latitudes share properties of the two. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature. 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122428
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geology and Geophysics, Yale University, 210 Whitney Ave, New Haven, CT 06511, United States; Department of Earth & Planetary Science, University of California Berkeley, 307 McCone Hall, Berkeley, CA 94720, United States; Department of Physics, Shirshov Institute of Oceanology, Russian Academy of Sciences, 36 Nakhimovsky Ave, Moscow, 117997, Russian Federation
Recommended Citation:
Fedorov A.V.,Muir L.,Boos W.R.,et al. Tropical cyclogenesis in warm climates simulated by a cloud-system resolving model[J]. Climate Dynamics,2019-01-01,52(2019-01-02)