气候变化领域集成服务门户(CCPortal): Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden-Julian Oscillation and Maritime Continent

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DOI	10.1029/2020JD032382
	Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden-Julian Oscillation and Maritime Continent
	Hagos S.; Zhang C.; Leung L.R.; Garuba O.; Burleyson C.D.; Balaguru K.
发表日期	2020
ISSN	2169897X
卷号	125 期号:13
英文摘要	This study investigates the seasonality of the interaction of the Madden-Julian Oscillation (MJO) with the Maritime Continent (MC). Beside their seasonal east-west migration with the monsoons, observations show that the MJO amplitude and precipitation over the MC islands exhibit semiannual variability, with apparent strengthening of MJO signal during March and September, when solar insolation is strongest over the MC region. Furthermore, during the high-insolation months, soil moisture shows wetter conditions during the early phases of the MJO. Motivated by these results, a series of regional convection permitting simulations are performed for the November 2014 MJO event as a case study under the following conditions: (i) increased solar insolation to mimic the local summer, (ii) reduced initial soil moisture, and (iii) the two conditions combined to isolate their local effects from their impacts on the large-scale circulation. Results show that increased insolation increases precipitation including that associated with MJO moisture convergence over the MC region. On the other hand, decreased initial soil moisture slightly increases precipitation over the MC islands and reduces it over the surrounding waters, but such effect is short lived as the increased precipitation gradually restores the soil moisture to wetter conditions. Using a moisture budget analysis that isolates the MJO and non-MJO signals and additional idealized simulations, the MJO response to high insolation is demonstrated to be related to an increase in the basic state moisture over the MC region rather than a direct response of the MJO to the insolation. ©2020. The Authors.
英文关键词	insolation; maritime continent; MJO; seasonality; soil moisture; WRF
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185923
作者单位	Pacific Northwest National Laboratory, Richland, WA, United States; NOAA Pacific Marine Environmental Laboratory, Seattle, WA, United States
推荐引用方式 GB/T 7714	Hagos S.,Zhang C.,Leung L.R.,et al. Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden-Julian Oscillation and Maritime Continent[J],2020,125(13).
APA	Hagos S.,Zhang C.,Leung L.R.,Garuba O.,Burleyson C.D.,&Balaguru K..(2020).Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden-Julian Oscillation and Maritime Continent.Journal of Geophysical Research: Atmospheres,125(13).
MLA	Hagos S.,et al."Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden-Julian Oscillation and Maritime Continent".Journal of Geophysical Research: Atmospheres 125.13(2020).