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Comparing initial large-scale fields from two HWRF runs with GFS analysis PowerPoint Presentation

Comparing initial large-scale fields from two HWRF runs with GFS analysis

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Comparing initial large-scale fields from two HWRF runs with GFS analysis

--Two HWRF configurations

❶ H14C : GSI is used on Domain 1

❷ T14C: GSI is not used Domain 1

--GFS analysis 0.5X0.5 grib2 data are used

H14C GFS analysis vs T14C

From Mingjing Tong

Procedure GFS analysis

Get data of both HWRF runs from hpss for all cycles in EPAC and ATL in Aug of 2012 and 2013. Total 447 cycles.

2. Use “copygb” to map HWRF domain 1 to the same grid of GFS data (0.5X0.5),

hr_grid="255 0 720 361 90000 000000 136 -90000 -500 500 500 0"

3. Calculate bias ( mean differences (HWRF – GFS), RMS difference for a given point.

SPFH not available in HWRF but available in GFS. Calculated both for consistent comparison.

Distribution of the number of available data points GFS analysis

# of Cycles in Aug 2012: 296 = 77E + 219L

# of Cycles in Aug 2013: 151 = 108E + 43L

Total: 447

HWRF analysis GFS analysis vs GFS analysis

- HGT (850mb, 500mb)
- TMP (850mb, 500mb)
- RH (850mb, 500mb)
- SPFH (850mb, 500mb)
- Wind speed (850mb, 500mb)
- U (850mb, 500mb)
- V (850mb, 500mb)

Why wind speed close, but wind components different ? GFS analysis

- Select one cycle to take a closer look

HWRF F72 GFS analysis vs GFS analysis

- HGT (850mb)
- TMP
- RH
- SPFH
- Wind speed
- U
- V

HWRF F72 GFS analysis vs GFS F72

- HGT (850mb)
- TMP
- RH
- SPFH
- Wind Speed
- U
- V

Summary GFS analysis

1. HWRF analysis vs GFS analysis

T14C (without GSI) is better than H14C (with GSI) in terms of scalar fields (HGT, TMP, RH, SPFH). U/V differences are large for both. POST is very likely the error source.

2. HWRF F72 vs GFS analysis

Largest difference is temperature over land. Both colder/wetter than GFS analysis. Spatial patterns of other differences somewhat correlate with TMP. Difference between T14C and H14C after 72hr integration not obvious, with T14C slightly better.

3. HWRF F72 vs GFS F72

Very similar, except temperature over land. Seem that spatial patterns of other variables ~ tmp. Better LSM will make comparison better.

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