Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0014.1 |
Effects of Rotation Rate and Seasonal Forcing on the ITCZ Extent in Planetary Atmospheres | |
Faulk, Sean1; Mitchell, Jonathan1,2; Bordoni, Simona3 | |
2017-03-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The authors study a wide range of atmospheric circulations with an idealized moist general circulation model to evaluate the mechanisms controlling intertropical convergence zone (ITCZ) migrations. They employ a zonally symmetric aquaplanet slab ocean of fixed depth and force top-of-atmosphere insolation to remain fixed at the pole for an "eternal solstice'' simulation and also vary seasonally for a range of rotation rates, keeping all other parameters Earth-like. For rotation rates VE/8 and slower, a transient maximum in zonal-mean precipitation appears at the summer pole; however, the ITCZ associated with the ascending branch of the Hadley circulation lies at; 608. The authors assess how widely used predictors of the ITCZ position perform in this wide parameter space. Standard predictors based on different estimates of the Hadley cell's poleward extent are correlated with but overestimate off-equatorial ITCZ locations. Interestingly, in the eternal-solstice case for Earth's rotation rate, the ITCZ remains at subtropical latitudes even though the lower-level moist static energy maximizes at the summer pole. While seemingly at odds with convective quasiequilibrium arguments, this can happen because at Earth's rotation rates, the thermal stratification set in convective regions can only be communicated within the tropics, where temperature gradients are constrained to be weak. The authors therefore develop an understanding of the ITCZ's position based on top-of atmosphere energetics and the boundary layer momentum budget and argue that friction and pressure gradient forces determine the region of maximum convergence, offering a modified dynamical perspective on the monsoon-like seasonal weather patterns of terrestrial planets. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394344800002 |
WOS关键词 | INTERTROPICAL CONVERGENCE ZONE ; MEDIATED REGIME TRANSITIONS ; NEAR-EQUATORIAL CONVECTION ; GENERAL-CIRCULATION MODEL ; MULTIPLE QUASI EQUILIBRIA ; PART I ; HADLEY CIRCULATIONS ; IDEALIZED GCM ; SYMMETRICAL ATMOSPHERE ; TROPICAL CIRCULATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29739 |
专题 | 地球科学 |
作者单位 | 1.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA; 2.Univ Calif Los Angeles, Atmospher & Ocean Sci, Los Angeles, CA USA; 3.CALTECH, Pasadena, CA 91125 USA |
推荐引用方式 GB/T 7714 | Faulk, Sean,Mitchell, Jonathan,Bordoni, Simona. Effects of Rotation Rate and Seasonal Forcing on the ITCZ Extent in Planetary Atmospheres[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(3). |
APA | Faulk, Sean,Mitchell, Jonathan,&Bordoni, Simona.(2017).Effects of Rotation Rate and Seasonal Forcing on the ITCZ Extent in Planetary Atmospheres.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(3). |
MLA | Faulk, Sean,et al."Effects of Rotation Rate and Seasonal Forcing on the ITCZ Extent in Planetary Atmospheres".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.3(2017). |
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