IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
Location and variation of the summertime upper‑tropospheretemperature maximum over South Asia
Wu,GX(Wu,Guoxiong)[1]; He,B(He,Bian)[1,2]; Liu,YM(Liu,Yimin)[1]; Bao,Q(Bao,Qing)[1]; Ren,RC(Ren,Rongcai)[1]
2015-03-03
Source PublicationClimate Dynamics
Volume45Issue:2015Pages:2757-2774
Subtype期刊论文
Abstract

The upper-troposphere-temperature-maximum (UTTM) over South Asia is a pronounced feature in the Northern Hemisphere summer. Its formation mechanism is still unclear. This study shows that the latitude location of the upper-tropospheric warm-center (T) coincides with the subtropical anticyclone, and its longitude location is determined by the zonal distribution of vertical gradient of heating/cooling (Qz = ∂Q/∂z), which is different from the Gill’s model. Since both convective heating and radiation cooling decrease with height in the upper troposphere, the heating/ cooling generates vertical northerly/southerly shear, leading to a warm/cold center being developed between heating in the east/west and cooling in the west/east. The location of the UTTM coincides with the South Asian High (SAH) and is between a radiation cooling in the west and the Asian-monsoon convection heating source in the east. The UTTM is sensitive to this convective heating: increased heating in the source region in a general circulation model causes intensifcation of both the SAH and UTTM, and imposing periodic convective heating there results in oscillations in the SAH, UTTM, and vertical motion to the west with the same period. Diagnoses of reanalysis indicate that such an inherent subtropical T–QZ relation is signifcant at interannual timescale. During the end of the twentieth century, rainfall increase over South China is accompanied by an increasing northerly flow aloft and intensifcation in the SAH and UTTM to the west. Results demonstrate that the feedback of atmospheric circulation to rainfall anomalies is an important contributor to the regional climate anomaly pattern.

KeywordUpper-troposphere Temperature Maximum(Uttm) Feedback Between Rainfall And Circulation Temperature–vertical Heating Gradient (T–qz) Relation
DOI10.1007/s00382-015-2506-4
Indexed BySCI
Language英语
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9484
Collection黄土与第四纪地质国家重点实验室(2010~)
Affiliation1.State Key Lab of Atmospheric Sciences and Geophysical FluidDynamics (LASG), Institute of Atmospheric Physics, ChineseAcademy of Sciences, Beijing 100029, China;
2.State Key Laboratory of Loess and Quaternary Geology, Instituteof Earth Environment, Chinese Academy of Sciences, Xi’an,China
Recommended Citation
GB/T 7714
Wu,GX(Wu,Guoxiong)[1],He,B(He,Bian)[1,2],Liu,YM(Liu,Yimin)[1],等. Location and variation of the summertime upper‑tropospheretemperature maximum over South Asia[J]. Climate Dynamics,2015,45(2015):2757-2774.
APA Wu,GX,He,B,Liu,YM,Bao,Q,&Ren,RC.(2015).Location and variation of the summertime upper‑tropospheretemperature maximum over South Asia.Climate Dynamics,45(2015),2757-2774.
MLA Wu,GX,et al."Location and variation of the summertime upper‑tropospheretemperature maximum over South Asia".Climate Dynamics 45.2015(2015):2757-2774.
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