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Interannual and Interdecadal Variabilities of Spring Rainfall over Northeast China and Their Associated Sea Surface Temperature Anomaly Forcings

Journal of climate, 2020-02, Vol.33 (4), p.1423-1435 [Peer Reviewed Journal]

2020 American Meteorological Society ;Copyright American Meteorological Society Feb 2020 ;ISSN: 0894-8755 ;EISSN: 1520-0442 ;DOI: 10.1175/JCLI-D-19-0302.1

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Title:
Interannual and Interdecadal Variabilities of Spring Rainfall over Northeast China and Their Associated Sea Surface Temperature Anomaly Forcings
Author: Lu, Rui ; Zhu, Zhiwei ; Li, Tim ; Zhang, Haiyang
Subjects: Anomalies ; Anticyclonic circulation ; Atmospheric precipitations ; Barotropic mode ; Circulation pattern anomalies ; Circulation patterns ; Convection ; Convection patterns ; Convective heating ; Datasets ; Dipoles ; Empirical analysis ; General circulation models ; Heating ; Hydrologic data ; Numerical experiments ; Oceanic convection ; Oceans ; Orthogonal functions ; Planetary waves ; Precipitation ; Precipitation gauges ; Rain ; Rainfall ; Rainfall anomalies ; Rainfall patterns ; Rainfall variability ; Rossby waves ; Sea surface ; Sea surface temperature ; Sea surface temperature anomalies ; Snow ; Spring ; Spring precipitation ; Summer ; Surface temperature ; Temperature anomalies ; Time ; Tropical climate ; Wave packets ; Wave trains ; Wind
Is Part Of: Journal of climate, 2020-02, Vol.33 (4), p.1423-1435
Description: 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.
Publisher: Boston: American Meteorological Society
Language: English
Identifier: ISSN: 0894-8755
EISSN: 1520-0442
DOI: 10.1175/JCLI-D-19-0302.1
Source: Alma/SFX Local Collection
ProQuest Central

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Interannual and Interdecadal Variabilities of Spring Rainfall over Northeast China and Their Associated Sea Surface Temperature Anomaly Forcings

2020 American Meteorological Society ;Copyright American Meteorological Society Feb 2020 ;ISSN: 0894-8755 ;EISSN: 1520-0442 ;DOI: 10.1175/JCLI-D-19-0302.1

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