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Abstract
Based on the ERA-40 and NCEP/NCAR reanalysis data, the NOAA Climate Prediction Center's merged
analysis of precipitation (CMAP), and the fifth-generation PSU/NCAR Mesoscale Model version 3 (MM5v3),
we defined a monsoon intensity index over the East Asian tropical region and analyzed the impacts of summer
(JuneJuly) South China Sea (SCS) monsoon anomaly on monsoon precipitation over the middle-lower
reaches of the Yangtze River (MLRYR) using both observational data analysis and numerical simulation
methods. The results from the data analysis show that the interannual variations of the tropical monsoon
over the SCS are negatively correlated with the southwesterly winds and precipitation over the MLRYR
during JuneJuly. Corresponding to stronger (weaker) tropical monsoon and precipitation, the southwesterly
winds are weaker (stronger) over the MLRYR, with less (more) local precipitation. The simulation results
further exhibit that when changing the SCS monsoon intensity, there are significant variations of monsoon
and precipitation over the MLRYR. The simulated anomalies generally consist with the observations, which
verifies the impact of the tropical monsoon on the monsoon precipitation over the MLRYR. This impact
might be supported by certain physical processes. Moreover, when the tropical summer monsoon is stronger,
the tropical anomalous westerly winds and positive precipitation anomalies usually maintain in the tropics
and do not move northward into the MLRYR, hence the transport of water vapor toward southern China is
weakened and the southwest flow and precipitation over southern China are also attenuated. On the other
hand, the strengthened tropical monsoon may result in the weakening and southward shift of the western
Pacific subtropical high through self-adjustment of the atmospheric circulation, leading to the weakening of
the monsoon flows and precipitation over the MLRYR.
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Citation
JIN Lijun, ZHAO Ping. 2012: Observational and Modeling Studies of Impacts of the South China Sea Monsoon on the Monsoon Rainfall in the Middle-Lower Reaches of the Yangtze River During Summer. Journal of Meteorological Research, 26(2): 176-188. DOI: 10.1007/s13351-012-0204-2
JIN Lijun, ZHAO Ping. 2012: Observational and Modeling Studies of Impacts of the South China Sea Monsoon on the Monsoon Rainfall in the Middle-Lower Reaches of the Yangtze River During Summer. Journal of Meteorological Research, 26(2): 176-188. DOI: 10.1007/s13351-012-0204-2
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JIN Lijun, ZHAO Ping. 2012: Observational and Modeling Studies of Impacts of the South China Sea Monsoon on the Monsoon Rainfall in the Middle-Lower Reaches of the Yangtze River During Summer. Journal of Meteorological Research, 26(2): 176-188. DOI: 10.1007/s13351-012-0204-2
JIN Lijun, ZHAO Ping. 2012: Observational and Modeling Studies of Impacts of the South China Sea Monsoon on the Monsoon Rainfall in the Middle-Lower Reaches of the Yangtze River During Summer. Journal of Meteorological Research, 26(2): 176-188. DOI: 10.1007/s13351-012-0204-2
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