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Global Ograpaphy With 30” USGS TOPO PowerPoint PPT Presentation


Global Ograpaphy With 30” USGS TOPO. Jordan Alpert. [email protected] 20070830 EMC brjiefing mtnlm7_briefing_30aug . USGS 30” Topography GFS Operations. Mountain elevation, sea-land mask, mtnvar _ 14 file for Gravity wave drag and Mountain Blocking.

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Global Ograpaphy With 30” USGS TOPO

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Global Ograpaphy

With 30” USGS TOPO

Jordan Alpert

[email protected] EMC brjiefing mtnlm7_briefing_30aug


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


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

Yellow > Green


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.


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….


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

  • 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.


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