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wrf小白,第一次发帖求鼓励。
CFSR再分析资料分辨率不高。而且在我下载唯一可用的surface数据文件之后发现,变量只有气压,wrf需要的其他surface变量都是从pressure level最底层近似得到的,效果不好,不建议使用。
CFSR预报场的使用方法和ERA-Interim的数据类似,数据需要分开下载。若已熟练掌握ERA-Interim背景场的使用,可轻松上手CFSR预报场。若不会使用ERA-Interim,请先学习ERA-Interim,之后上手CFSR,因为ERA-Interim的经验贴很多,英文分享贴也有很多,方便自学。
CFSR最坑爹的是提供可选的文件非常多,如果没有经验很可能找不到需要下载的数据。
本人经过多次尝试,surface数据要选择后缀为sfluxgrbf.tar中的cdas1.t00z.sfluxgrbf06.grib2 pressure level的数据要选择后缀为pgrbh.tar中的pgrbh06.grib2(此句为本帖的核心内容)
其他的步骤和ERA-Interim如出一辙,不再赘述。
还有一个问题比较坑,举个例子:cdas1.20180501.pgrbh.tar中cdas1.t00z.pgrbh06.grib2的数据应直接看成2018年5月1日6时的背景场,而不是看成0时的背景场,namelist.wps设置时要格外留意这一点,一不小心就会出问题。
最后附CFSR的下载网址和数据文件命名规则:
下载网址:https://rda.ucar.edu/datasets/ds094.0/#!access
命令规则:
CFSV2 file types:XXXXX | Levels | Product Type | Grid Resolution | ipvgrbanl | Isentropic | Analyses | 1-degree | ipvgrbf | Isentropic | 1- through 9-hour Forecasts | 1-degree | ipvgrbh | Isentropic | 1- through 9-hour Forecasts | 0.5-degree | ipvgrbl | Isentropic levels | 1- through 9-hour Forecasts | 2.5-degree | ocngrbf | Ocean | 1 hour Averages for hours 1 through 9 | 1-degree | ocngrbh | Ocean | 1 hour Averages for hours 1 through 9 | 0.5-degree | ocngrbl | Ocean | 1 hour Averages for hours 1 through 9 | 2.5-degree | pgrbanl | Atmospheric Pressure | Analyses | 1-degree | pgrbf | Atmospheric Pressure, Surface and Flux Fields | 1- through 9-hour Forecasts | 1-degree | pgrbh | Atmospheric Pressure, Surface* and Flux* Fields | Analyses and 1- through 9-hour Forecasts | 0.5-degree | pgrbl | Atmospheric Pressure, Surface and Flux Fields | 1- through 9-hour Forecasts | 2.5-degree | sfluxgrbf | Surface and Flux Fields | 1 through 9 hours | 0.2-degree | sfluxgrbl | Surface and Flux Fields | 1 through 9 hours | 1.9-degree | splgrbanl | Selected Surface/Near-Surface Parameters | Analyses | 0.2-degree | splgrbf | Selected Surface/Near-Surface Parameters | 6-hour Forecasts | 0.2-degree | splgrbl | Selected Surface/Near-Surface Parameters | Analyses and 6-hour Forecasts | 1.9-degree | * Parameters not analyzed by CFS will only be available as forecasts
Inside of each tar file will be the model output files from the individual CFSV2 model initializations (the model is initialized four times per day). The file names will have the form cdas1.tHHz.XXXXXFF.grib2, where:
XXXXX is a file type (see above),
HH is the initialization time (00, 06, 12, or 18 UTC),
FF is the forecast hour (the time at which the data are valid)
Forecast hours*:FF | Description | anl | Analysis | 01-09 | Number of hours after initialization time at which the data are valid | * For file types ipvgrbanl, pgrbanl, and splgrbanl, which already contain the forecast hour for analysis in the type, the forecast hour is NOT repeated in the file name
命名规则引自:https://rda.ucar.edu/datasets/ds094.0/#docs/cfsv2_filenames.html
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