气候变化领域集成服务门户(CCPortal): Fidelity of Regional Climate Model v4.6 in capturing seasonal and subseasonal variability of Indian summer monsoon

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DOI	10.1016/j.dynatmoce.2021.101203
	Fidelity of Regional Climate Model v4.6 in capturing seasonal and subseasonal variability of Indian summer monsoon
	Agrawal N.; Singh B.B.; Pandey V.K.
发表日期	2021
ISSN	03770265
卷号	94
英文摘要	Climate modeling studies in the context of Indian summer monsoon (ISM) variability have usually been performed on the seasonal and interannual timescales. The present study assesses the fidelity of the Regional Climate Model (RegCM v4.6) in capturing the subseasonal active and break spells along with the seasonal mean rainfall during the ISM season. The model fields are obtained from 24 years (1982–2005) of simulation and validated against the observations and latest reanalyzed ERA5 data products. Our analysis indicates that RegCM v4.6 fairly captures the large scale features of ISM and improvement in seasonal rainfall is noted as compared to its precedent RegCM v4.4. At subseasonal timescales, though the model captures the active and break spells of ISM, the length and frequency of these events seem inconsistent as compared to the observations. Occurrences of breaks and associated circulation features are mostly consistent but the active spells are significantly misconstrued in the model. The dry air intrusion from the western region and lack of monsoon low over the mainland and Bay of Bengal seem to suppress the precipitation in the model. This subseasonal bias might persist due to systematic errors linked to the lack of ocean coupling, inefficiency of land surface and cumulus parameterization schemes in the model. Overall, RegCM v4.6 offers improvements at seasonal timescale but needs further improvements to realistically represent the subseasonal variability of ISM. © 2021 Elsevier B.V.
英文关键词	Active and break spells; Indian summer monsoon; RegCM
语种	英语
scopus关键词	Atmospheric thermodynamics; Rain; Systematic errors; Cumulus parameterization schemes; Dry-air intrusions; Indian summer monsoon; Regional climate modeling; Seasonal mean rainfall; Seasonal rainfall; Subseasonal variability; Western region; Climate models; annual variation; climate modeling; monsoon; parameterization; regional climate; seasonality; summer; timescale; Bay of Bengal; Indian Ocean
来源期刊	Dynamics of Atmospheres and Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178242
作者单位	K. Banerjee Centre of Atmospheric and Ocean Studies (KBCAOS), Institute of Interdisciplinary Studies, Nehru Science Centre, University of Allahabad, Prayagraj, 211 002, India; Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, 411 008, India
推荐引用方式 GB/T 7714	Agrawal N.,Singh B.B.,Pandey V.K.. Fidelity of Regional Climate Model v4.6 in capturing seasonal and subseasonal variability of Indian summer monsoon[J],2021,94.
APA	Agrawal N.,Singh B.B.,&Pandey V.K..(2021).Fidelity of Regional Climate Model v4.6 in capturing seasonal and subseasonal variability of Indian summer monsoon.Dynamics of Atmospheres and Oceans,94.
MLA	Agrawal N.,et al."Fidelity of Regional Climate Model v4.6 in capturing seasonal and subseasonal variability of Indian summer monsoon".Dynamics of Atmospheres and Oceans 94(2021).