Intra-seasonal contrasting trends in clouds due to warming induced circulation changes

Abstract Quantification of long term changes in cloud distribution and properties is critical for the proper assessment of future climate. We show contrasting trends in cloud properties and cloud radiative effects over Northwest Indian Ocean (NWIO) in south Asian summer monsoon. Cloud top height (CT...

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Autores principales:	S. S. Prijith, C. B. Lima, M. V. Ramana, M. V. R. Sesha Sai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3cc09769bcd9463b88c6f070fd9865ce
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spelling	oai:doaj.org-article:3cc09769bcd9463b88c6f070fd9865ce2021-12-02T15:10:54ZIntra-seasonal contrasting trends in clouds due to warming induced circulation changes10.1038/s41598-021-96246-22045-2322https://doaj.org/article/3cc09769bcd9463b88c6f070fd9865ce2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96246-2https://doaj.org/toc/2045-2322Abstract Quantification of long term changes in cloud distribution and properties is critical for the proper assessment of future climate. We show contrasting trends in cloud properties and cloud radiative effects over Northwest Indian Ocean (NWIO) in south Asian summer monsoon. Cloud top height (CTH) decreases in June (− 69 ± 3 myr−1) and July (− 44 ± 3 myr−1), whereas it increases in August (106 ± 2 myr−1) and September (37 ± 1 myr−1). These contrasting trends are investigated to be due to the changes in upper tropospheric winds and atmospheric circulation pattern. Strengthening of upper tropospheric easterlies and changes in vertical wind dampen the vertical development of clouds in June and July. In contrast, weakening of upper tropospheric winds over NWIO and strengthening of updraft favour the vertical growth of clouds in August. Further, changes in horizontal winds at 450–350 hPa and strengthening of Indian Ocean Walker cell favour the westward spread of high level clouds, contributing to the increase in CTH over NWIO in August. Decrease of cloud cover and altitude in June and July and increase of the same in subsequent months would affect the monsoon rainfall over the Indian region. Proper representation of these intra-seasonal contrasting trends of clouds in climate models is important for the better prediction of regional weather.S. S. PrijithC. B. LimaM. V. RamanaM. V. R. Sesha SaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. S. Prijith C. B. Lima M. V. Ramana M. V. R. Sesha Sai Intra-seasonal contrasting trends in clouds due to warming induced circulation changes
description	Abstract Quantification of long term changes in cloud distribution and properties is critical for the proper assessment of future climate. We show contrasting trends in cloud properties and cloud radiative effects over Northwest Indian Ocean (NWIO) in south Asian summer monsoon. Cloud top height (CTH) decreases in June (− 69 ± 3 myr−1) and July (− 44 ± 3 myr−1), whereas it increases in August (106 ± 2 myr−1) and September (37 ± 1 myr−1). These contrasting trends are investigated to be due to the changes in upper tropospheric winds and atmospheric circulation pattern. Strengthening of upper tropospheric easterlies and changes in vertical wind dampen the vertical development of clouds in June and July. In contrast, weakening of upper tropospheric winds over NWIO and strengthening of updraft favour the vertical growth of clouds in August. Further, changes in horizontal winds at 450–350 hPa and strengthening of Indian Ocean Walker cell favour the westward spread of high level clouds, contributing to the increase in CTH over NWIO in August. Decrease of cloud cover and altitude in June and July and increase of the same in subsequent months would affect the monsoon rainfall over the Indian region. Proper representation of these intra-seasonal contrasting trends of clouds in climate models is important for the better prediction of regional weather.
format	article
author	S. S. Prijith C. B. Lima M. V. Ramana M. V. R. Sesha Sai
author_facet	S. S. Prijith C. B. Lima M. V. Ramana M. V. R. Sesha Sai
author_sort	S. S. Prijith
title	Intra-seasonal contrasting trends in clouds due to warming induced circulation changes
title_short	Intra-seasonal contrasting trends in clouds due to warming induced circulation changes
title_full	Intra-seasonal contrasting trends in clouds due to warming induced circulation changes
title_fullStr	Intra-seasonal contrasting trends in clouds due to warming induced circulation changes
title_full_unstemmed	Intra-seasonal contrasting trends in clouds due to warming induced circulation changes
title_sort	intra-seasonal contrasting trends in clouds due to warming induced circulation changes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3cc09769bcd9463b88c6f070fd9865ce
work_keys_str_mv	AT ssprijith intraseasonalcontrastingtrendsincloudsduetowarminginducedcirculationchanges AT cblima intraseasonalcontrastingtrendsincloudsduetowarminginducedcirculationchanges AT mvramana intraseasonalcontrastingtrendsincloudsduetowarminginducedcirculationchanges AT mvrseshasai intraseasonalcontrastingtrendsincloudsduetowarminginducedcirculationchanges
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Intra-seasonal contrasting trends in clouds due to warming induced circulation changes

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