请教T639R细网格数据grib2解码的问题？

wheelar

国家气象局下发的T639R细网格原始资料文件名为Z_NAFP_C_BABJ_20160322120000_P_CNPC-T639-GMFS-HNEHE-02400.grib2，我用wgrib2解码：
wgrib -V Z_NAFP_C_BABJ_20160322120000_P_CNPC-T639-GMFS-HNEHE-02400.grib2 >T639R.V，结果文件里的内容没有指出具体是什么要素：

T639R.V内容如下：
1:0:vt=2016032312:10 mb:24 hour fcst:var discipline=0 master_table=4 parmcat=3 parm=5:
    ndata=205761:undef=0:mean=30756.8:min=30089.8:max=31159.7
    grid_template=0:
lat-lon grid:(641 x 321) units 1e-06 input WE:NS output WE:SN res 48
lat 90.000000 to 0.000000 by 0.281250
lon 0.000000 to 180.000000 by 0.281250 #points=205761
2:69202:vt=2016032312:20 mb:24 hour fcst:var discipline=0 master_table=4 parmcat=3 parm=5:
    ndata=205761:undef=0:mean=26220.6:min=25451.2:max=26530.1
    grid_template=0:
lat-lon grid:(641 x 321) units 1e-06 input WE:NS output WE:SN res 48
lat 90.000000 to 0.000000 by 0.281250
lon 0.000000 to 180.000000 by 0.281250 #points=205761
3:130490:vt=2016032312:30 mb:24 hour fcst:var discipline=0 master_table=4 parmcat=3 parm=5:
    ndata=205761:undef=0:mean=23611.4:min=22821.8:max=23850.6
    grid_template=0:
lat-lon grid:(641 x 321) units 1e-06 input WE:NS output WE:SN res 48
lat 90.000000 to 0.000000 by 0.281250
lon 0.000000 to 180.000000 by 0.281250 #points=205761
4:191031:vt=2016032312:50 mb:24 hour fcst:var discipline=0 master_table=4 parmcat=3 parm=5:
    ndata=205761:undef=0:mean=20367.7:min=19597.8:max=20664.3
    grid_template=0:
lat-lon grid:(641 x 321) units 1e-06 input WE:NS output WE:SN res 48
lat 90.000000 to 0.000000 by 0.281250
lon 0.000000 to 180.000000 by 0.281250 #points=205761
5:248791:vt=2016032312:70 mb:24 hour fcst:var discipline=0 master_table=4 parmcat=3 parm=5:
    ndata=205761:undef=0:mean=18272.3:min=17505.5:max=18750.2
    grid_template=0:
lat-lon grid:(641 x 321) units 1e-06 input WE:NS output WE:SN res 48
lat 90.000000 to 0.000000 by 0.281250
lon 0.000000 to 180.000000 by 0.281250 #points=205761
6:309745:vt=2016032312:100 mb:24 hour fcst:var discipline=0 master_table=4 parmcat=3 parm=5:

。。。。。。
我怎么才能知道红色区域是50mb的什么要素呢？
   

ybhldl

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