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001021478 1001_ $$0P:(DE-Juel1)180256$$aClemens, Jan$$b0$$eCorresponding author
001021478 245__ $$aA multi-scenario Lagrangian trajectory analysis to identify source regions of the Asian tropopause aerosol layer on the Indian subcontinent in August 2016
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001021478 520__ $$aThe Asian tropopause aerosol layer (ATAL) is present during the Asian summer monsoon season affecting the radiative balance of the atmosphere. However, the source regions and transport pathways of ATAL particles are still uncertain. Here, we investigate transport pathways from different regions at the model boundary layer (MBL) to the ATAL by combining two Lagrangian transport models (CLaMS, Chemical Lagrangian Model of the Stratosphere; MPTRAC, Massive-Parallel Trajectory Calculations) with balloon-borne measurements of the ATAL performed by the Compact Optical Backscatter Aerosol Detector (COBALD) above Nainital (India) in August 2016. Trajectories are initialised at the measured location of the ATAL and calculated 90 d backwards in time to investigate the relation between the measured, daily averaged, aerosol backscatter ratio and source regions at the MBL. Different simulation scenarios are performed to find differences and robust patterns when the reanalysis data (ERA5 or ERA-Interim), the trajectory model, the vertical coordinate (kinematic and diabatic approach) or the convective parameterisation are varied. The robust finding among all scenarios is that the largest continental air mass contributions originate from the Tibetan Plateau and the Indian subcontinent (mostly the Indo-Gangetic Plain), and the largest maritime air mass contributions in Asia come from the western Pacific (e.g. related to tropical cyclones). Additionally, all simulation scenarios indicate that the transport of maritime air from the tropical western Pacific to the region of the ATAL lowers the backscatter ratio (BSR) of the ATAL, while most scenarios indicate that the transport of polluted air from the Indo-Gangetic Plain increases the BSR. While the results corroborate key findings from previous ERA-Interim-based studies, they also highlight the variability in the contributions of different MBL regions to the ATAL depending on different simulation scenarios.
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001021478 7001_ $$0P:(DE-Juel1)129164$$aVogel, Bärbel$$b1
001021478 7001_ $$0P:(DE-Juel1)129125$$aHoffmann, Lars$$b2
001021478 7001_ $$0P:(DE-Juel1)129121$$aGriessbach, Sabine$$b3
001021478 7001_ $$0P:(DE-Juel1)129162$$aThomas, Nicole$$b4
001021478 7001_ $$00000-0003-4442-0755$$aFadnavis, Suvarna$$b5
001021478 7001_ $$0P:(DE-Juel1)129138$$aMüller, Rolf$$b6
001021478 7001_ $$0P:(DE-HGF)0$$aPeter, Thomas$$b7
001021478 7001_ $$0P:(DE-Juel1)129141$$aPloeger, Felix$$b8
001021478 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-24-763-2024$$gVol. 24, no. 1, p. 763 - 787$$n1$$p763 - 787$$tAtmospheric chemistry and physics$$v24$$x1680-7316$$y2024
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