Experiment designcasename Bc method Control

variableStart time Crashed time

gsi227 GFS 0800 1521

gsiupbc227 GFS upbc 0800 complete

enkfst0800ppert227 GFS pertbc P,U,V,T,Q 0800 1218

enkfst0803ppert227 GFS pertbc P,U,V,T,Q 0803 1218

enkfst0803pspert227 GFS pertbc Ps,U,V,T,Q 0803 1218

enkfst0803psup227 GFS upbc Ps,U,V,T,Q 0803 1218

enkfst0815psup227 GFS upbc Ps,U,V,T,Q 0815 1218

enkfst1200psup227 GFS upbc Ps,U,V,T,Q 1200 1215

enkfst0800psup207 GFS upbc Ps,U,V,T,Q 0800 complete

wrf GFS/without data assimilation

1200 1220

Terrain height

WRF NUMBER OF TILES = 1 d01 2010-05-12_20:09:00 2 points exceeded cfl=2 in domain d01 at tim e 2010-05-12_20:09:00 hours d01 2010-05-12_20:09:00 MAX AT i,j,k: 188 3 3 ver t_cfl,w,d(eta)= 2.464560 1.330656 7.0000291E-03 d01 2010-05-12_20:09:00 1 points exceeded cfl=2 in domain d01 at tim e 2010-05-12_20:09:00 hours d01 2010-05-12_20:09:00 MAX AT i,j,k: 188 3 2 ver t_cfl,w,d(eta)= 2.685481 -0.9787120 4.0000081E-03

2 2 2 2

2 2

2 2

; -1 , 1 1

( 2.0*ln( ) / );

2.0*ln( )*

r x y where x y x y

coeff sqrt r r

x yz coeff x x

x y

，且

00;lim

xy z

The innovation vector

Q Sprd randomcv (up) / EnKF final analysis(down)

T Sprd randomcv (up) / EnKF final analysis(down)

U Sprd randomcv (up) / EnKF final analysis(down)

V Sprd randomcv (up) / EnKF final analysis(down)