Boundary Blend

• 2100/10/2008~2200/10/2008• 5 dtg every 6h full update cycle• 3 domain (45/15/5km)• WRFVAR/WRF_V2.1.1• NCEP BD• Two experiment

– Boundary blend (BD) on domain 15/5 km– No boundary blend (NBD)

• 500hPa vorticity

Code Verify-500 Vor Diff

2100 ana

2106 ana

2112 ana

2100 06f

2106 06f

2112 06f

500hPa Vor2008/10/2100

NBD BD

500 hPa Vor_Diff2008/10/2100

500hPa Vor2008/10/2106

NBD BD

500 hPa Vor_Diff2008/10/2106

500hPa Vor2008/10/2112

NBD BD

500 hPa Vor_Diff2008/10/2112

500hPa Vor2008/10/2118

NBD BD

500 hPa Vor_Diff2008/10/2118

500hPa Vor2008/10/2200

NBD BD

500 hPa Vor_Diff2008/10/2200

21/1811h f

21/1812h f

NBD

BD

21/1811h f

21/1812h f

BD is better

BD

2200 6h f 2200 9h f 2200 12h f

2200 6h f 2200 9h f 2200 12h f

NBD

• After 5 dtg full update cycle run, difference at end date is obviously.

• Unknown the reason to cause this difference by the effect of integration or by the BD big forcing

• Redo the experiment to do extend to 7 dtg full update cycle run