气候变化领域集成服务门户(CCPortal): Reexamining the moisture mode theories of the madden-julian oscillation based on observational analyses

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DOI	10.1175/JCLI-D-20-0441.1
	Reexamining the moisture mode theories of the madden-julian oscillation based on observational analyses
	Hu F.; Li T.; Gao J.; Hao L.
发表日期	2021
ISSN	0894-8755
起始页码	839
结束页码	853
卷号	34 期号:2
英文摘要	Two existing moisture mode theories of the MJO, one emphasizing boundary layer moisture asymmetry (MA) and the other emphasizing column-integrated moist static energy (MSE) tendency asymmetry (TA), were validated with the diagnosis of observational data during 1979-2012. A total of 2343 MJO days are selected. While all these days show a clear phase leading of the boundary layer moisture, 20% of these days do not show a positive column-integrated MSE tendency in front of MJO convection (non-TA). A further MSE budget analysis indicates that the difference between the non-TA composite and the TA composite lies in the zonal extent of anomalously vertical overturning circulation in front of the MJO convection. A background mean precipitation modulation mechanism is proposed to explain the distinctive circulation responses. Dependent on the MJO location, an anomalous Gill response to the heating is greatly modulated by the seasonal mean and ENSO induced precipitation fields. Despite the negative MSE tendency in front of MJO convection in the non-TA group, the system continues moving eastward due to the effect of the boundary layer moistening, which promotes a convectively unstable stratification ahead of MJO convection. The analysis result suggests that the first type of moisture mode theories, the moisture asymmetry mechanism, appears more robust, particularly over the eastern Maritime Continent and western Pacific. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Boundary layers; Budget control; Moisture; Madden-Julian oscillation; Maritime Continent; Mean precipitation; Moist static energy; Observational analysis; Observational data; Overturning circulation; Western Pacific; Climatology; atmospheric moisture; boundary layer; composite; convection; El Nino-Southern Oscillation; Madden-Julian oscillation; overturn; precipitation assessment; Canada; Maritime Provinces; Pacific Ocean; Pacific Ocean (West)
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170960
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environmental Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; Department of Atmospheric Sciences, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI, United States; Fujian Key Laboratory of Severe Weather, Fujian Meteorological Bureau, China Meteorological Administration, Fuzhou, Fujian, China; Tianjin Climate Center, Tianjin, China
推荐引用方式 GB/T 7714	Hu F.,Li T.,Gao J.,et al. Reexamining the moisture mode theories of the madden-julian oscillation based on observational analyses[J],2021,34(2).
APA	Hu F.,Li T.,Gao J.,&Hao L..(2021).Reexamining the moisture mode theories of the madden-julian oscillation based on observational analyses.Journal of Climate,34(2).
MLA	Hu F.,et al."Reexamining the moisture mode theories of the madden-julian oscillation based on observational analyses".Journal of Climate 34.2(2021).