Recent Enhanced Deep Troposphere-to-Stratosphere Air Mass Transport Accompanying the Weakening Asian Monsoon

IF 2.8 3区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Bin Chen, Jianzhong Ma, Wei Zhang, Jianchun Bian, Tianliang Zhao, Xiangde Xu
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Abstract

The Asian monsoon (AM) region is a well-known region with prevailing stratosphere–troposphere exchange (STE). However, how the STE across this region changes with the weakening AM remains unclear. Here, we particularly diagnose the air mass transport between the planetary boundary layer (PBL) and the stratosphere over the AM region during 1992–2017 using the Lagrangian particle dispersion model FLEXPART based on the ERA-Interim reanalysis data. The results show that both the downward and upward deep STEs exhibit a detectable increasing trend, while the latter, namely, the deep troposphere-to-stratosphere transport (DTST), is relatively more significant. Further analysis reveals that the long-term trend of DTST over the AM region could be partly attributed to changes in the Pacific Walker circulation and the air temperature (especially at upper levels). Additionally, it is found that DTST increases markedly over the tropical oceanic regions, while the increasing DTST into the stratosphere can be attributed to the enhanced air masses originated from the PBL over the terrestrial regions, where large amounts of pollutant emissions occur. The results imply that the influence of the DTST on the chemical composition and the climate of the stratosphere over the AM region is expected to become increasingly important, and is thereby of relevance to climate projection in an evolving climate.

近期伴随亚洲季风减弱而增强的深对流层-平流层气团输送
亚洲季风区是众所周知的平流层-对流层交换(STE)盛行的地区。然而,该地区的平流层-对流层交换是如何随着季风的减弱而变化的仍不清楚。在此,我们利用基于ERA-Interim再分析数据的拉格朗日粒子扩散模式FLEXPART,特别诊断了1992-2017年间AM地区行星边界层与平流层之间的气团输送。结果表明,向下和向上的深层 STE 都呈现出可检测到的上升趋势,而后者,即对流层至平流层的深层传输(DTST),相对更为显著。进一步的分析表明,AM 地区的 DTST 长期趋势可部分归因于太平洋沃克环流和气温(尤其是高层气温)的变化。此外,研究还发现,热带海洋区域上空的 DTST 显著增加,而进入平流层的 DTST 增加则可能是由于来自陆地区域上空 PBL 的气团增强所致,因为陆地区域上空有大量污染物排放。这些结果表明,DTST 对 AM 地区平流层的化学成分和气候的影响预计将变得越来越重要,从而与不断变化的气候中的气候预测有关。
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来源期刊
Journal of Meteorological Research
Journal of Meteorological Research METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
6.20
自引率
6.20%
发文量
54
期刊介绍: Journal of Meteorological Research (previously known as Acta Meteorologica Sinica) publishes the latest achievements and developments in the field of atmospheric sciences. Coverage is broad, including topics such as pure and applied meteorology; climatology and climate change; marine meteorology; atmospheric physics and chemistry; cloud physics and weather modification; numerical weather prediction; data assimilation; atmospheric sounding and remote sensing; atmospheric environment and air pollution; radar and satellite meteorology; agricultural and forest meteorology and more.
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