【求问】wrfout中RAINC和RAINNC两个变量有什么区别

葡萄不是哭包

这是用ncl_filedump命令输出的两个变量的信息，但我看不出这两个变量具体有什么区别

float RAINC ( Time, south_north, west_east )
         FieldType :        104
         MemoryOrder :        XY
         description :        ACCUMULATED TOTAL CUMULUS PRECIPITATION
         units :        mm
         stagger :       
         coordinates :        XLONG XLAT

float RAINNC ( Time, south_north, west_east )
         FieldType :        104
         MemoryOrder :        XY
         description :        ACCUMULATED TOTAL GRID SCALE PRECIPITATION
         units :        mm
         stagger :       
         coordinates :        XLONG XLAT

tbag

Some of these questions have no simple answer.

RAINC is produced by the cumulus parameterization. There are several cumulus schemes available in WRF, so you need to know which one is being used. Each scheme is described in one or more papers, but these may be difficult to understand for those not familiar with cloud dynamics.

RAINNC is produced by the cloud microphysics scheme and any other processes that generate precipitation on the grid scale. On scales > 10 km, this is mostly from stratiform clouds. At high resolution < 5 km, grid scale may resolve some cumulus clouds and their precipitation will be included in RAINNC. For domains with resolution < 2-5 km, you should not use any cumulus scheme because most or all convection will be resolved at the grid scale. In this case, RAINC=0. The microphysics schemes are also described in the literature but you need a good understanding of cloud physics.

Gary.

楼主弄明白了吗？同问