Control Run Precipitation Comparison John D. McMillen.

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Presentation transcript:

Control Run Precipitation Comparison John D. McMillen

27 Oct 2010 GSLE Case TERRA ~1030L

Trevor’s Total Accum. Precip.

My Total Accum. Precip. WRF 3.4 Includes updates to Thompson

Trevor’s GSLE Total Accum. Precip UTC

My GSLE Total Accum. Precip UTC

Total Accumulated Precipitation Analysis UTC GSLE Domain RunMax Precip (mm) Mean Precip (mm) Percent Change Area GTE 10 mm Precip (km 2 ) Area GTE 15 mm Precip (km 2 ) Area GTE 20 mm Precip (km 2 ) Trevor’s Thesis N/A731 Trevor’s Control (From Thesis) 0.42 (From My Control) My Control N/A

Trevor’s GSLE Total Accum. Graupel UTC

My GSLE Total Accum. Graupel UTC

Total Accumulated Graupel Analysis UTC GSLE Domain RunMax Precip (mm) Mean Precip (mm) Percent Change Area GTE 2 mm Precip (km 2 ) Area GTE 10 mm Precip (km 2 ) Area GTE 15 mm Precip (km 2 ) Area GTE 20 mm Precip (km 2 ) Trevor’s Control My Control N/A

Trevor’s GSLE Total Accum. Snow UTC

My GSLE Total Accum. Snow UTC

Total Accumulated Snow Analysis UTC GSLE Domain RunMax Precip (mm) Mean Precip (mm) Percent Change Area GTE 10 mm Precip (km 2 ) Trevor’s Control My Control N/A357

Trevor’s GSLE Total Accum. Rain UTC

My GSLE Total Accum. Rain UTC

Total Accumulated Rain Analysis UTC GSLE Domain RunMax Precip (mm) Mean Precip (mm) Percent Change Area GTE 3 mm Precip (km 2 ) Trevor’s Control My Control N/A169

Changes in Thompson Scheme Graupel Density Increased Changes Size Distribution More smaller graupel 1-3mm and less larger graupel >8mm Increases mass especially of larger graupel Causes more small graupel accumulation in my control Snow fall velocity parameter in the fall speed power law Increased snow fall speed Reduced accumulated snow in my control Thompson 2008 noted increased precipitation accumulation with decreased fall speed Cloud Ice mass/number balance adjusted Rain processes slightly changed

Conclusions Differences between controls are small Changes in Thompson appear to correlate with differences in controls I expanded my RIP abilities I performed analytical comparisons of wrfout data I examined the Thompson scheme on the code level to find what had changed between versions I need to do more…

Way Ahead I think I need to further test the differences in Thompson Unsure how Analytically I need to get the correct equations out of the code. I have found two different equations for Graupel Gamma Intercept in the literature Average the mixing ratios/num of species over time and over the domain and over depth Vertically integrated mixing ratios

Way Ahead Present domain and time averages as profiles Model Level Graupel Mixing Ratio kg/kg Trevor’s Mine Each model level is domain averaged at Each 30 minute time step from This values are averaged across the time period