气候变化领域集成服务门户(CCPortal): Climatology and variability of air mass transport from the boundary layer to the Asian monsoon anticyclone

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DOI	10.5194/acp-22-15659-2022
	Climatology and variability of air mass transport from the boundary layer to the Asian monsoon anticyclone
	Nuetzel, Matthias; Brinkop, Sabine; Dameris, Martin; Garny, Hella; Joeckel, Patrick; Pan, Laura L.; Park, Mijeong
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	15659
结束页码	15683
卷号	22 期号:24 页码:25
英文摘要	Air masses within the Asian monsoon anticyclone (AMA) show anomalous signatures in various trace gases. In this study, we investigate how air masses are transported from the planetary boundary layer (PBL) to the AMA based on multiannual trajectory analyses. In particular, we focus on the climatological perspective and on the intraseasonal and interannual variability. Further, we also discuss the relation of the interannual east-west displacements of the AMA with the transport from the PBL to the AMA. To this end we employ backward trajectories, which were computed for 14 northern summer (June-August) seasons using reanalysis data. Further, we backtrack forward trajectories from a free-running chemistry-climate model (CCM) simulation, which includes parametrized Lagrangian convection. The analysis of 30 monsoon seasons of this additional model data set helps us to carve out robust or sensitive features of transport from the PBL to the AMA with respect to the employed model. Results from both the trajectory model and the Lagrangian CCM emphasize the robustness of the three-dimensional transport pathways from the top of the PBL to the AMA. Air masses are transported upwards on the south-eastern side of the AMA and subsequently recirculate within the full AMA domain, where they are lifted upwards on the eastern side and transported downwards on the western side of the AMA. The contributions of different PBL source regions to AMA air are robust across the two models for the Tibetan Plateau (TP; 17 % vs. 15 %) and the West Pacific (around 12 %). However, the contributions from the Indian subcontinent and Southeast Asia are considerably larger in the Lagrangian CCM data, which might indicate an important role of convective transport in PBL-to-AMA transport for these regions. The analysis of both model data sets highlights the interannual and intraseasonal variability of the PBL source regions of the AMA. Although there are differences in the transport pathways, the interannual east-west displacement of the AMA - which we find to be related to the monsoon Hadley index - is not connected to considerable differences in the overall transport characteristics. Our results from the trajectory model data reveal a strong intraseasonal signal in the transport from the PBL over the TP to the AMA: there is a weak contribution of TP air masses in early June (less than 4 % of the AMA air masses), whereas in August the contribution is considerable (roughly 24 %).The evolution of the contribution from the TP is consistent across the two modelling approaches and is related to the northward shift of the subtropical jet and the AMA during this period. This finding may help to reconcile previous results and further highlights the need of taking the subseasonal (and interannual) variability of the AMA and associated transport into account.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000898187100001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273806
作者单位	Helmholtz Association; German Aerospace Centre (DLR); University of Munich; National Center Atmospheric Research (NCAR) - USA
推荐引用方式 GB/T 7714	Nuetzel, Matthias,Brinkop, Sabine,Dameris, Martin,et al. Climatology and variability of air mass transport from the boundary layer to the Asian monsoon anticyclone[J],2022,22(24):25.
APA	Nuetzel, Matthias.,Brinkop, Sabine.,Dameris, Martin.,Garny, Hella.,Joeckel, Patrick.,...&Park, Mijeong.(2022).Climatology and variability of air mass transport from the boundary layer to the Asian monsoon anticyclone.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(24),25.
MLA	Nuetzel, Matthias,et al."Climatology and variability of air mass transport from the boundary layer to the Asian monsoon anticyclone".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.24(2022):25.