气候变化领域集成服务门户(CCPortal): The MJO’s impact on rainfall trends over the Congo rainforest

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DOI	10.1007/s00382-020-05133-5
	The MJO’s impact on rainfall trends over the Congo rainforest
	Raghavendra A.; Zhou L.; Roundy P.E.; Jiang Y.; Milrad S.M.; Hua W.; Xia G.
发表日期	2020
ISSN	0930-7575
起始页码	2683
结束页码	2695
卷号	54
英文摘要	A significant declining trend in rainfall over the Congo basin has been observed over the past three decades. Since the Madden–Julian oscillation (MJO) is a major forcing mechanism for tropical convection and rainfall, the interannual variability and trend in rainfall over the Congo may be partly attributable to variability or changes in the MJO. This study explores the long-term (1979–2018) relationship between the active MJO diagnosed by the real-time multivariate (RMM) MJO phase index data and observed rainfall and cloud data over the Congo during October–March. Since the MJO may significantly enhance rainfall during the wet phases or suppress rainfall during the dry phases, the crux of this paper includes how trends in MJO activity may impact the overall observed precipitation trend over the Congo. The relationship between MJO activity and rainfall over the Congo was documented using statistical techniques and composite analysis. A new, yet simple approach was developed to partition seasonal rainfall depending on the MJO phase (i.e., wet, dry, inactive, and other). Results show a significant correlation between the number of wet and dry MJO days, and rainfall enhancement and suppression over the Congo. While there exists considerable interannual variability in MJO activity and rainfall over the Congo, there is a significant increase in the number of dry MJO days (3.47 days decade−1) which tends to intensify the large-scale drying trend over the Congo during October–March. The increasing trend in the number of dry MJO days is likely enhancing the net drying trend by 13.6% over the Congo. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Congo rainforest; Madden–Julian oscillation (MJO); Rainfall trend; Tropical rainbelt
语种	英语
scopus关键词	annual variation; atmospheric convection; atmospheric forcing; Madden-Julian oscillation; rainfall; rainforest; trend analysis; tropical forest; Congo
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/145568
作者单位	Department of Atmospheric and Environmental Sciences, University at Albany, Albany, NY, United States; Meteorology Program, Applied Aviation Sciences Department, Embry-Riddle Aeronautical University, Daytona Beach, FL, United States; Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, 210044, China; National Renewable Energy Laboratory, National Wind Technology Center, Golden, CO, United States
推荐引用方式 GB/T 7714	Raghavendra A.,Zhou L.,Roundy P.E.,等. The MJO’s impact on rainfall trends over the Congo rainforest[J],2020,54.
APA	Raghavendra A..,Zhou L..,Roundy P.E..,Jiang Y..,Milrad S.M..,...&Xia G..(2020).The MJO’s impact on rainfall trends over the Congo rainforest.Climate Dynamics,54.
MLA	Raghavendra A.,et al."The MJO’s impact on rainfall trends over the Congo rainforest".Climate Dynamics 54(2020).