气候变化领域集成服务门户(CCPortal): The fidelity of a regional coupled model in capturing the relationship between intraseasonal variability and the onset/demise of the Indian summer monsoon

CCPortal

DOI	10.1007/s00382-020-05252-z
	The fidelity of a regional coupled model in capturing the relationship between intraseasonal variability and the onset/demise of the Indian summer monsoon
	Karmakar N.; Misra V.
发表日期	2020
ISSN	0930-7575
起始页码	4693
结束页码	4710
卷号	54
英文摘要	Onset and demise of the Indian summer monsoon (ISM) and intraseasonal variability (ISV) embedded within the ISM are dominant climatological phenomena observed over the Indian region. In this study, a quantitative relationship between these two phenomena is assessed and the performance of a regional coupled model in simulating the relationship in the ISM is examined. An objective definition of the local onset and demise of the ISM is used based on more than a century-long India Meteorological Department rain-gauge observation and 10-year-long model simulated precipitation. Two distinct modes of intraseasonal oscillations (ISOs), northwestward propagating 10–20-day periodic high-frequency ISO and northward moving 20–70-day periodic low-frequency ISOs are extracted using Multichannel Singular Spectrum Analysis (MSSA). It is found that nearly 60% of the local onset of the ISM occurs during the positive developing phases of the ISO; whereas, a similar fraction of local demise occurs during positive decaying phases of the ISO across almost entire India. Essentially, the phase-locking of two ISOs creates the most conducive environment for onset or demise of the ISM to occur. In this study we found that the model not only captures the overall structure of the ISO modes, but also simulates the observed distribution of the onset and demise dates of ISM in different ISO phases. The diagnostics described here, with the ability of the model to produce the observed phenomena, provide an essential tool to improve our understanding of the monsoon system and its predictability. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Indian monsoon; Intraseasonal oscillation; Onset and demise of Indian Monsoon; Regional coupled model
语种	英语
scopus关键词	air-sea interaction; atmosphere-ocean coupling; climate modeling; climate oscillation; climate prediction; climatology; computer simulation; monsoon; numerical model; precipitation assessment; regional climate; seasonal variation; summer; India
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145442
作者单位	Earth, Ocean and Atmospheric Science Department, Florida State University, Tallahassee, FL 32306, United States; Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, United States; Florida Climate Institute, Florida State University, Tallahassee, FL, United States
推荐引用方式 GB/T 7714	Karmakar N.,Misra V.. The fidelity of a regional coupled model in capturing the relationship between intraseasonal variability and the onset/demise of the Indian summer monsoon[J],2020,54.
APA	Karmakar N.,&Misra V..(2020).The fidelity of a regional coupled model in capturing the relationship between intraseasonal variability and the onset/demise of the Indian summer monsoon.Climate Dynamics,54.
MLA	Karmakar N.,et al."The fidelity of a regional coupled model in capturing the relationship between intraseasonal variability and the onset/demise of the Indian summer monsoon".Climate Dynamics 54(2020).