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DOI10.1175/JAS-D-19-0169.1
Axisymmetric Hadley Cell Theory with a Fixed Tropopause Temperature Rather than Height
Hill, Spencer A.1,2; Bordoni, Simona1,3; Mitchell, Jonathan L.2,4
2020-04-01
发表期刊JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN0022-4928
EISSN1520-0469
出版年2020
卷号77期号:4页码:1279-1294
文章类型Article
语种英语
国家USA; Italy
英文摘要

Axisymmetric Hadley cell theory has traditionally assumed that the tropopause height (H-t) is uniform and unchanged from its radiative-convective equilibrium (RCE) value by the cells' emergence. Recent studies suggest that the tropopause temperature (T-t), not height, is nearly invariant in RCE, which would require appreciable meridional variations in H-t. Here, we derive modified expressions of axisymmetric theory by assuming a fixed T-t and compare the results to their fixed-H-t counterparts. If T-t and the depth-averaged lapse rate are meridionally uniform, then at each latitude H-t varies linearly with the local surface temperature, altering the diagnosed gradient-balanced zonal wind at the tropopause appreciably (up to tens of meters per second) but the minimal Hadley cell extent predicted by Hide's theorem only weakly (less than or similar to 1 degrees) under standard annual-mean and solsticial forcings. A uniform T-t alters the thermal field required to generate an angular-momentum-conserving Hadley circulation, but these changes and the resulting changes to the equal-area model solutions for the cell edges again are modest (<10%). In numerical simulations of latitude-by-latitude RCE under annual-mean forcing using a single-column model, assuming a uniform T-t is reasonably accurate up to the midlatitudes, and the Hide's theorem metrics are again qualitatively insensitive to the tropopause definition. However imperfectly axisymmetric theory portrays the Hadley cells in Earth's macroturbulent atmosphere, evidently its treatment of the tropopause is not an important error source.


英文关键词Atmosphere Tropics Atmospheric circulation Hadley circulation Momentum
领域地球科学
收录类别SCI-E
WOS记录号WOS:000528754800003
WOS关键词GENERAL-CIRCULATION ; ANVIL CLOUDS ; MODEL ; CONSTRAINT ; CLIMATE ; LAYER ; ATMOSPHERES ; SURFACE ; SCALE
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/280316
专题地球科学
作者单位1.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA;
2.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA;
3.Univ Trento, Dept Civil Environm & Mech Engn DICAM, Trento, Italy;
4.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA
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Hill, Spencer A.,Bordoni, Simona,Mitchell, Jonathan L.. Axisymmetric Hadley Cell Theory with a Fixed Tropopause Temperature Rather than Height[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(4):1279-1294.
APA Hill, Spencer A.,Bordoni, Simona,&Mitchell, Jonathan L..(2020).Axisymmetric Hadley Cell Theory with a Fixed Tropopause Temperature Rather than Height.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(4),1279-1294.
MLA Hill, Spencer A.,et al."Axisymmetric Hadley Cell Theory with a Fixed Tropopause Temperature Rather than Height".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.4(2020):1279-1294.
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