| Transportation conditions of water vapor and water vapor Play a very important role in the precipitation process of water vapor as well as in the first rainy season in Southern China. Before and after the water vapor transport differences of South China Sea summer monsoon rainfall, Southern China become the important influence factor of juvenile. With climate change, the onset of summer monsoon, the evolvement and the water vapor transport channel, will affect the rainfall in Southern China for many years and partial juvenile characteristics which has the characteristics of response to climate change. Therefore, in-depth study on temporal and spatial variation of the rainfall in Southern China how important water vapor partial youth system delivery channels, with particular attention to the difference between before and after the onset of the South China Sea Monsoon and the change rule. At the same time, to time some corresponding physical quantities field evolution, as well as to the rainstorm in Southern China directly or indirectly influence also makes a detailed analysis, in order to meet in Southern China to build more water vapor distribution environment system,as the first rainy season in Southern China rainstorm climate research to provide a useful reference.In this paper, using NCEP/NCAR global objective reanalysis data, provided by the National Climate Center’s1961-2010Chinese753stations daily observation data of Southern China firstly (72stations) of precipitation, water vapor content, each layer of the SCS summer monsoon onset date for a variety of statistical analysis, the preliminary draw the following conclusions:(1) according to the analysis of the precipitation A index1961-2010, Southern China area in recent50years,7years and5precipitation rainfall years.(2) according to the REOF analysis, Southern China area can be divided into three climate regions, respectively is the Fujian area, Guangxi and Hainan, and Guangdong area, Southern China in the water vapor content in the atmosphere below85%700hPa;(3) the onset of the SCS summer monsoon period exist obvious annual variation but outbreak dates are generally concentrated in May, when the onset date is with other methods in this paper to determine the basic line, before and after the onset of circulation situation changed obviously, especially the water vapor transport.(4) NCEP/NCAR reanalysis data wet power based on a statistical analysis, obtained in Southern China area where three water vapor flow, the three water vapor transportation channel are respectively from the Western Pacific Ocean southeast of the South China Sea water vapor by the airflow conveying airflow, the bay of Bengal south peninsula in the southwest water vapor, air transportation around the Qinghai Tibet Plateau on the south side of the northeast and mid latitude water vapor (weak). Before the onset of the SCS summer monsoon from the South China Sea, southwest Pacific Ocean southeast direction of the water vapor transport flow more obvious. After the onset of the SCS summer monsoon confluence, southwest water vapor transportation from the bay of Bengal and west pacific air from the southeast sea water vapor of the airflow, intensity are larger.(5) cycle three vapor channel analysis shows, from the bay of Bengal through the Indochina Peninsula southwest water vapor transportation flow (southwest) strength is about14years and periodic change of5years; from the Pacific Northwest to south of the South China Sea by water vapor transport stream (southeast) had12-14and cycle5years of change in strength; strength from the mid latitude around the southern rim of the Qinghai Tibet Plateau westerly water vapor transport stream (northwest) is about15years and period of6-7years.(6) a further analysis of the precipitation for many years before and after partial juvenile in the South China Sea summer monsoon water vapor flux, water vapor flux divergence, and difference, precipitation that caused the first rainy season in Southern China:how much rain precipitation differences, have a direct relationship with low-level moisture convergence in rainy years of stronger, more from the Western Pacific by the South China Sea southeast direction of the impact of water vapor transport over the bay of Bengal; and the Indo China Peninsula southwest water vapor transportation change in Southern China abnormal precipitation effect of.(7) of three water vapor channel separately in the first flood season, the South China Sea summer monsoon related analysis of wind broke out and Southern China area, South China Sea summer precipitation before the display of water vapor channel in before the summer monsoon onset effect on Guangdong precipitation area obviously, after the outbreak of the whole of Southern China, including Guangxi, Guangdong and Northern Fujian precipitation area more significantly; the south water vapor channel before the summer monsoon onset over Guangxi and Fujian significantly, after monsoon onset and southern Guangdong and Eastern Guangxi are considered to be closely related to. Northwest water vapor channel before and after monsoon onset over the effect was weak.(8) the precipitation years and juvenile onset of the SCS summer monsoon precipitation and precipitation days in synthetic water vapor channel and environment elements analysis showed that, after the onset of the SCS summer monsoon, Southern China is mainly affected by a strong westerly wind jet, and Southern China in the gas flow velocity of strong convergence zone. After the monsoon onset, lower layer convergence region of Southern China are stronger than that before the summer monsoon onset. The latent heat flux analysis showed that after the summer monsoon onset latent heat flux in the pre monsoon. The sensible heat flux is weaker than before the outbreak, which broke out more water vapor condensation latent heat release, strong, and precipitation caused the bottom temperature, sensible heat flux, low. At the same time the rainy years feeling less rain year high heat value, value range about20-40W m-2. |
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