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DOI | 10.1175/JAS-D-17-0208.1 |
A Two-Dimensional Dynamical Model for the Subseasonal Variability of the Asian Monsoon Anticyclone | |
Amemiya, Arata; Sato, Kaoru | |
2018-10-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:10页码:3597-3612 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | The Asian monsoon anticyclone, which develops in the upper troposphere and lower stratosphere during boreal summer, exhibits significant subseasonal variability with a characteristic spatial structure. The dynamics of this variability is investigated using a nonlinear -plane shallow-water model. The equivalent depth is estimated using reanalysis data to relate the three-dimensional dynamics in isentropic coordinates to the shallow-water model. Composite analysis reveals the resemblance of the horizontal structures between the Montgomery streamfunction and thickness on the 360-K level. However, the coefficients of the linear regressions between those two variables are strongly dependent on latitude. The estimated equivalent depths of the northern region are more than 2 times greater than those of the southern region. This is attributable to the background thermal structure around the tropopause. Based on this, a latitude-dependent mean depth is incorporated into the shallow-water model to numerically investigate responses to a steady localized forcing in the subtropics. With the inclusion of the latitudinal dependence of the mean depth, the vortex shedding state is able to have a longitudinally confined structure, which differs from the conventional case of constant mean depth. The spatial structure of this numerical solution corresponds to the observed structure, in which low-PV air is largely confined to finite longitudes within the Asian monsoon anticyclone. This suggests the possible role of dynamical instability and the interaction with the subtropical jet in determining the characteristic structure of the Asian monsoon anticyclone. |
英文关键词 | Atmospheric circulation Dynamics Shallow-water equations Monsoons Stratosphere-troposphere coupling Intraseasonal variability |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445058800001 |
WOS关键词 | BOUNDARY-LAYER SOURCES ; SUMMER MONSOON ; LOWER STRATOSPHERE ; TRANSPORT PATHWAYS ; UPPER TROPOSPHERE ; TIBETAN PLATEAU ; CIRCULATION ; BIMODALITY ; OSCILLATIONS ; OROGRAPHY |
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/29415 |
专题 | 地球科学 |
作者单位 | Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan |
推荐引用方式 GB/T 7714 | Amemiya, Arata,Sato, Kaoru. A Two-Dimensional Dynamical Model for the Subseasonal Variability of the Asian Monsoon Anticyclone[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(10):3597-3612. |
APA | Amemiya, Arata,&Sato, Kaoru.(2018).A Two-Dimensional Dynamical Model for the Subseasonal Variability of the Asian Monsoon Anticyclone.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(10),3597-3612. |
MLA | Amemiya, Arata,et al."A Two-Dimensional Dynamical Model for the Subseasonal Variability of the Asian Monsoon Anticyclone".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.10(2018):3597-3612. |
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