Characteristics of a pre-monsoon dryline atmospheric boundary layer over the rain shadow region: A case study
A dryline is the zone of distinct moisture gradient separating warm, moist, and hot, dry air masses. It is usually associated with mesoscale phenomena and plays a significant role in atmospheric boundary layer (ABL) dynamics including initiation of convection/thunderstorms. In the tropical Indian re...
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Frontiers Media S.A.
2022-10-01
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Series: | Frontiers in Remote Sensing |
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Online Access: | https://www.frontiersin.org/articles/10.3389/frsen.2022.1028587/full |
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author | Raman Solanki Neelam Malap K. Gayatri Y. Jaya Rao Thara Prabhakaran |
author_facet | Raman Solanki Neelam Malap K. Gayatri Y. Jaya Rao Thara Prabhakaran |
author_sort | Raman Solanki |
collection | DOAJ |
description | A dryline is the zone of distinct moisture gradient separating warm, moist, and hot, dry air masses. It is usually associated with mesoscale phenomena and plays a significant role in atmospheric boundary layer (ABL) dynamics including initiation of convection/thunderstorms. In the tropical Indian region, these dryline conditions are normally associated with the pre-monsoon season. In the present study, dryline characteristics over a rain shadow region in the Indian subcontinent were investigated utilizing observations and Weather Research and Forecasting (WRF) model from 28 to 30 May 2019. Based upon Wind Profiler Radar and MicroWave Radiometer Profiler measurements, the ABL characteristics were investigated. Interestingly, the ABL height was found to evolve up to 5 km with the horizontal wind vectors oscillating between north-westerly and north-easterly flow. During the intense ABL deepening, stronger downdraft cores were observed in comparison with the updraft cores. The stronger downdrafts entrained free-tropospheric dry air thereby further deepening the ABL. Based upon the entrainment velocity estimates at the ABL top and the variations in potential temperature, the dynamic entrainment fluxes were estimated and further implemented for evaluating two slab models to recreate the ABL growth. With this analysis, we demonstrate the significant contribution of entrainment fluxes on ABL growth during dryline conditions. |
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language | English |
last_indexed | 2024-04-11T02:11:10Z |
publishDate | 2022-10-01 |
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spelling | doaj.art-dbf47fe000a24549bf75a391b9f0452c2023-01-03T02:10:32ZengFrontiers Media S.A.Frontiers in Remote Sensing2673-61872022-10-01310.3389/frsen.2022.10285871028587Characteristics of a pre-monsoon dryline atmospheric boundary layer over the rain shadow region: A case studyRaman SolankiNeelam MalapK. GayatriY. Jaya RaoThara PrabhakaranA dryline is the zone of distinct moisture gradient separating warm, moist, and hot, dry air masses. It is usually associated with mesoscale phenomena and plays a significant role in atmospheric boundary layer (ABL) dynamics including initiation of convection/thunderstorms. In the tropical Indian region, these dryline conditions are normally associated with the pre-monsoon season. In the present study, dryline characteristics over a rain shadow region in the Indian subcontinent were investigated utilizing observations and Weather Research and Forecasting (WRF) model from 28 to 30 May 2019. Based upon Wind Profiler Radar and MicroWave Radiometer Profiler measurements, the ABL characteristics were investigated. Interestingly, the ABL height was found to evolve up to 5 km with the horizontal wind vectors oscillating between north-westerly and north-easterly flow. During the intense ABL deepening, stronger downdraft cores were observed in comparison with the updraft cores. The stronger downdrafts entrained free-tropospheric dry air thereby further deepening the ABL. Based upon the entrainment velocity estimates at the ABL top and the variations in potential temperature, the dynamic entrainment fluxes were estimated and further implemented for evaluating two slab models to recreate the ABL growth. With this analysis, we demonstrate the significant contribution of entrainment fluxes on ABL growth during dryline conditions.https://www.frontiersin.org/articles/10.3389/frsen.2022.1028587/fullCAIPEEXatmospheric boundary layer (ABL) heightdrylineentrainmentslab modelvertical wind |
spellingShingle | Raman Solanki Neelam Malap K. Gayatri Y. Jaya Rao Thara Prabhakaran Characteristics of a pre-monsoon dryline atmospheric boundary layer over the rain shadow region: A case study Frontiers in Remote Sensing CAIPEEX atmospheric boundary layer (ABL) height dryline entrainment slab model vertical wind |
title | Characteristics of a pre-monsoon dryline atmospheric boundary layer over the rain shadow region: A case study |
title_full | Characteristics of a pre-monsoon dryline atmospheric boundary layer over the rain shadow region: A case study |
title_fullStr | Characteristics of a pre-monsoon dryline atmospheric boundary layer over the rain shadow region: A case study |
title_full_unstemmed | Characteristics of a pre-monsoon dryline atmospheric boundary layer over the rain shadow region: A case study |
title_short | Characteristics of a pre-monsoon dryline atmospheric boundary layer over the rain shadow region: A case study |
title_sort | characteristics of a pre monsoon dryline atmospheric boundary layer over the rain shadow region a case study |
topic | CAIPEEX atmospheric boundary layer (ABL) height dryline entrainment slab model vertical wind |
url | https://www.frontiersin.org/articles/10.3389/frsen.2022.1028587/full |
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