During the early summer rainy season (April to June) of China, frequency and intensity of torrential-rain in South China increase after the onset of South China Sea (SCS) Monsoon in late May, being a serious threat to people’s lives and properties and causing great economic losses. To expedite our understanding of processes key to the torrential rain formation and our efforts to improve simulation and prediction of the torrential rain, the China Meteorological Administration initiated and are organizing Southern China Monsoon Rainfall Experiment (SCMREX). SCMREX consists of four integrated components: field campaign, data collection/processing/sharing, numerical modeling study, and physical mechanism study.
The field campaign of SCMREX aims to obtain unique and composite observations of the fine-scale structures of the convective systems and of their atmospheric environment during the early summer rainy season. The field experiments will be launched in a region mainly covering Guangdong, Guangxi, Hainan, Hong Kong and the offshore of SCS during mid-April to mid-June of 2013-2014. The experiments will capture the thermodynamic and dynamic properties of the atmosphere, the boundary-layer wind field in particular which is of significant importance to convection initiation, by utilizing the wind profilers, rawinsondes, GPS/MET stations, and dropsondes. Dynamic and microphysical structures of precipitating systems will be detected not only by the Doppler weather radars and lightning location system, but also multiple advanced remote sensing equipments in two enhanced observing areas: 2 C-band dual-polarization radars, 1 X-band dual-polarization radar, 1 micro-rain radar, 4 raindrop distrometers, and 2 millimeter-wave cloud radars.
The numerical modeling study of SCMREX aims to reduce initial errors of numerical weather prediction, improve physical schemes in numerical model, and conduct/evaluate meso-scale ensemble prediction experiments. The physical mechanism studies are mainly about (a) the roles of low-level jet, planetary boundary layer, and underlying surface on initiation and development of the rainy storms; (b) the microphysical features and processes of the convective systems. A scientific database and a website will be setup to share the data sets from the field campaign and modeling study.
SCMREX has been ratified as a Research and Development Project (RDP) of WMO/WWRP, and has attracted widespread participation and cooperation from many countries such as Japan, Korea, Australia, and Philippines.
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