气候变化领域集成服务门户(CCPortal): Interannual and interdecadal variabilities of spring rainfall over Northeast China and their associated sea surface temperature anomaly forcings

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DOI	10.1175/JCLI-D-19-0302.1
	Interannual and interdecadal variabilities of spring rainfall over Northeast China and their associated sea surface temperature anomaly forcings
	Lu R.; Zhu Z.; Li T.; Zhang H.
发表日期	2020
ISSN	0894-8755
起始页码	1423
结束页码	1435
卷号	33 期号:4
英文摘要	An empirical orthogonal function (EOF) analysis was conducted for spring precipitation gauge data over northeast China (NEC). The first EOF mode is characterized by a homogenous rainfall pattern throughout NEC. The corresponding principal component has both significant interannual and interdecadal variations. This leading mode explains a large portion of the total NEC spring rainfall (NECSR) variances and is statistically independent from other higher modes. The physical processes responsible for the interannual and interdecadal variabilities were investigated via observational diagnoses and numerical experiments. On the interannual time scale, NECSR is mainly affected by the SST anomalies (SSTAs) in the northern tropical Atlantic Ocean. When the SSTAs are positive, the subsequently induced positive precipitation and convection can stimulate two quasi-barotropic Rossby wave trains over the mid- to high latitudes. A cyclonic anomaly center of the Rossby wave train appears over northeastern Asia, leading to a positive rainfall anomaly in the region. On the interdecadal time scale, NECSR is mainly influenced by the SSTAs over the warm-pool region. Positive SSTAs in the warm-pool region result in enhanced convection (ascending motion) around the Maritime Continent and suppressed convection (descending motion) over the central equatorial Pacific Ocean. This zonal dipole convection pattern stimulates a quasi-barotropic circulation pattern with an anticyclonic anomaly over the Tibetan Plateau and a cyclonic anomaly over northeastern Asia. The cyclonic anomaly over northeastern Asia enhances the NECSR. Numerical experiments further suggested that the convective heating anomaly over the Maritime Continent, rather than cooling over the central equatorial Pacific, plays a more essential role in driving the interdecadal rainfall variability of NECSR. Ó 2020 American Meteorological Society.
英文关键词	Mechanical waves; Meteorological instruments; Oceanography; Orthogonal functions; Surface waters; American meteorological societies; Barotropic circulation; Empirical orthogonal function analysis; Equatorial Pacific Ocean; Inter-decadal variability; Inter-decadal variations; Positive rainfall anomalies; Sea surface temperature anomalies; Rain; air-sea interaction; annual variation; climate forcing; decadal variation; empirical orthogonal function analysis; rainfall; raingauge; Rossby wave; sea surface temperature; temperature anomaly; Atlantic Ocean; Atlantic Ocean (Tropical); China; Qinghai-Xizang Plateau
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/171446
作者单位	Yichun Meteorological Bureau, Heilongjiang, China; Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; International Pacific Research Center, Department of Atmospheric Sciences, University of Hawai‘i at Manoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Lu R.,Zhu Z.,Li T.,et al. Interannual and interdecadal variabilities of spring rainfall over Northeast China and their associated sea surface temperature anomaly forcings[J],2020,33(4).
APA	Lu R.,Zhu Z.,Li T.,&Zhang H..(2020).Interannual and interdecadal variabilities of spring rainfall over Northeast China and their associated sea surface temperature anomaly forcings.Journal of Climate,33(4).
MLA	Lu R.,et al."Interannual and interdecadal variabilities of spring rainfall over Northeast China and their associated sea surface temperature anomaly forcings".Journal of Climate 33.4(2020).