# Presentation: 350230

**With 30” USGS TOPO**

- 	NOAA/NWS/EMC	jordan.alpert@noaa.gov	20070830  EMC brjiefing mtnlm7_briefing_30aug

- Jordan Alpert

## USGS 30” Topography GFS Operations

- Mountain elevation, sea-land mask, mtnvar_14 file for Gravity wave drag and Mountain Blocking.
- USGS 30” interpolated to 8’ (S-Y.).
- Navy 10’ used for lakes and Antarctic
- Spectral filter applied.
- 8’ radar sat GICE.

## USGS Topography New 30”

- GFS Gaussian grid directly interpolated from 30” to all GFS grids (next slide).
- 30” radar sat GICE (Grumbine)
- Lakes from 30” UMD (regional, Gayno) but 8’ can still be used.
- Spectral filter can be applied or not.

## jcap     lonb          latb         filt1         filt2

-  62       192            94           42              96
- 126       384          190           84            128
- 170       512          256          128            172
- 190       576          288          174            192
- 254       768          384          192            256
- 382      1152          576          256           384
- 510      1152          576          to be decided
- 510
- 576

## Slide 5

## Slide 6

## Slide 7

## Slide 8

## Higher peaks in 30” cause new mtns to be higher than 8’ .

- Yellow > Green

## Slide 10

## Slide 11

## Slide 12

## Slide 13

## 

jcap     lonb          latb         filt1         filt2

 62       192            94           42              96

126       384          190           84            128

170       512          256          128            172

190       576          288          174            192

254       768          384          192            256

382      1152          576          256           384

510      1152          576          to be decided

510

576

- jcap     lonb          latb         filt1         filt2
-  62       192            94           42              96
- 126       384          190           84            128
- 170       512          256          128            172
- 190       576          288          174            192
- 254       768          384          192            256
- 382      1152          576          256           384
- 510      1152          576          to be decided
- 510
- 576

##  Interpolating from 30” directly fixes problem in Kim’s GWD OA Asymmetry parameter. 

## Slide 16

## Slide 17

## Runs

- Fanglin ran t126 from IC, forecast only.
- July 1-22.
- Score is close but worse and one drop out.
- The difference could be because higher resolution makes higher peaks available that are not smoothed in 8’.
- Then with lower surface pressure, days (skin T) should be hotter and nights colder.
- If model is already warm at surface then new mountains will make it worse and warmer surfaces could have irreversible effects with convection/cloud/radiation.

## ...Less than a point difference if 19th removed....

- ...Less than a point difference if 19th removed....

## Slide 20

## Slide 21

## Slide 22

## NB: over land hgt increase, f12, f24 diurnal enhancement

## Exec

- export jcap=382
- export latb=576
- export lonb=1152
- export filt1=256
- export filt2=384
- /global/save/wx23ja/terr07/mtnlm7/ml7_slm10g.sh    \
-  slmgb${jcap} orogb${jcap} mtnvar14_${jcap} $lonb \ $latb ${jcap} 1 $filt1 $filt2 1

## Summary

- See _[http://www.emc.ncep.noaa.gov/gmb/wd23ja/mb/mtn07/[ml${jcap}]_[30sl,10sl,8]_${var}....gif](http://www.emc.ncep.noaa.gov/gmb/wd23ja/mb/mtn07/%5Bml$%7Bjcap%7D%5D_%5B30sl,10sl,8%5D_$%7Bvar%7D_5days.gif)_
- For more plots as well as Fanglin’s web site
- http://www.emc.ncep.noaa.gov/gmb/wx24fy/vsdb_exp/neworg382/www/maps/

## Summary

- New Orography based on 30” with 30” lake/sea-land mask, GICE, and mtnvar_14 GWD and Mtn Blocking fixed fields.
- Need to run with cycling for high and low resolution to see if cycling analysis adjusts.
- Testing continues at T126.
- Other changes to GWD/Mtn Blocking done.