Using the ERA-Interim reanalysis data provided by the European Centre for Medium-range Weather Forecasts (ECMWF) and the atmospheric composition data provided by the Microwave Limb Sounder (MLS)， the impacts of the south-north displacement in the South Asia High (SAH) on the distribution of water vapor， ozone (O3) and carbon monoxide (CO) in the Upper Troposphere Lower Stratosphere (UTLS) of the Asian monsoon region are analyzed.The results show that： (1) Water vapor and CO at 200 hPa are higher over the Iranian plateau， northeastern Tibetan Plateau and northeastern China during northward displaced SAH (NSAH) than those during southward displaced SAH (SSAH)， except in the north of the Bay of Bengal and in the northern part of the Indochina Peninsula.At 100 hPa， the water vapor in the SAH range during NSAH is higher than those during SSAH， while the CO is higher during SSAH than those during NSAH.At 68 hPa， CO in the SAH range during NSAH are weaker than those during SSAH.The distribution of ozone at different heights is roughly opposite to those of CO.(2) During NSAH the convection activities in the west and north side of SAH is stronger than those during SSAH and the intensity of SAH north of the 30°N is also stronger than those during SSAH.Stronger convection during NSAH leads to more lower-tropospheric air transporting upwards， resulting in the higher (lower) values of water vapor and CO (O3) at 215 hPa over the Iranian plateau and Qinghai-Tibet Plateau to the northeastern China than those during SSAH.(3) At 100 hPa， the geopotential height in the south of the anticyclonic circulation is higher and the vertical ascending motion is stronger during SSAH than those during NSAH.Thus， tropospheric air with high concentration water vapor and CO and low concentration ozone are transported upward.As a result， the concentration of 100-hPa CO (O3) at 100 hPa is stronger (lower) during SSAH than that during NSAH.For the water vapor， the tropopause temperature in the SAH area is lower during SSAH.Effected of “condensation and dehydration”， the 100-hPa water vapor in the SSAH is lower than that in the SSAH.(4) The “trapping” effect during SSAH is weaker than those during NSAH， causing the stronger ascending motion and transporting more air with higher (lower) concentrated CO (O3) to 68 hPa.
Houwang TU
,
Hongying TIAN
,
Xiran XU
,
Ruhua ZHANG
. Influence of the South-North Displacement of South Asia High on the Distribution of Atmospheric Composition in the Upper Troposphere-Lower Stratosphere over the Asian Monsoon Region[J]. Plateau Meteorology, 2020
, 39(2)
: 333
-346
.
DOI: 10.7522/j.issn.1000-0534.2019.00054
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