Xingang Fan

WKU_logo 


Mesoscale Numerical Modeling/

Weather Prediction

Using WRF in Polar Regions

The new release of WRF 2.2 model is used in the Arctic coast to simulate extreme wind events along the Beaufort Sea coast. Bugs have been found in the new WRF WPS when dealing with sea ice, soil temperature and moisture. Also, the use of reanalysis datasets (e.g., NARR, ERA-40, NNRP) to drive the model has been practiced:

(Click on the images for higher resolution)

WRF model is used to simulate the wind events in Beaufort Sea region. The model is setup to be driven by NARR and ERA-40 reanalysis datasets. Similar setup is configured for MM5 model to compare with the WRF model results. Nudging scheme is tested too.

Map of Beaufort Sea region

The extreme wind event of August 09-13, 2000, caused by a strong low pressure system (cyclone):

SLP low system

Wind speed and wind vectors:

wind field

Four-day simulation of 10-m wind speed at Deadhorse, AK, from different model runs.

Deadhorse winds

More informaiton on model setup and experiment description are in this presentation at the Great Alaska Weather Modeling Symposium (GAWMS) held March 13-15, 2007 in Fairbanks, Alaska. More presentations of this conference can be found here.

Arctic Reanalysis

An experimental Arctic reanalysis system (EARS) has been setup and run for a full year 1998. Comparisons have been conducted among the EARS, NNRP, and ERA-40. Encouraging results are shown from this mesoscale high-resolution (30-km) Arctic regional reanalysis. Independent tests with SHEBA data is undergoing. Results shown here are from the EARS/MM5 system.

(Click on the images for higher resolution)

The pan-Arctic domain for the Arctic Reanalysis:

Pan-Arctic domain for Arctic Reanalysis

Verification against surface observations, and comparisons with ERA-40 and NNRP:

surface variables

ETS and BIAS scores of 6-hour accumulated precipitation from 3 reanalysis:

precipitation_ETS_BIAS

Verification with upper-air soundings:

upper air variables

Summer (JJA) and winter (DJF) total precipitation from observations, ERA-40, and EARS:

seasonal precipitation distribution

For more results, see the presentation in the special session Arctic System Modeling at the 7th International Conference on Global Change: Connection to the Arctic (GCCA-7) held February 19-20, 2007 in Fairbansk, Alaksa.

Data ?

If you would be interested in verifying this experimental data, please Email me.

 
Copyrightę2008-2013       Updated 2013-01-10