14 Ligia Bernardet 123 Mrinal Biswas 14 Craig Hartsough 123 Testing Hurricane WRF with Alternate Radiation and Partial Cloudiness Schemes Developmental Testbed Center NOAA ESRL GSD ID: 1046165
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1. Christina R. Holt1,2,3, Greg Thompson1,4, Ligia Bernardet1,2,3,Mrinal Biswas1,4, Craig Hartsough1,2,3Testing Hurricane WRF with Alternate Radiation and Partial Cloudiness SchemesDevelopmental Testbed CenterNOAA ESRL GSDCIRES/University of ColoradoNational Center for Atmospheric Research
2. OutlineBackgroundExperiment configurationVerification of track and intensityVerification of large scale fieldsConclusions
3. DTC’s role in HWRF development: connecting the pieces3
4. BackgroundThe investigation of DTC tests revealed two important deficiencies of the configuration of the RRTMG radiation scheme used in those experimentsOnly explicit clouds from the mp scheme are visible to the RRTMG – subgrid cumulus clouds (from SAS) are transparentUnder representation of stratus clouds in coarse resolution (horizontal and vertical) outer domainDTC worked to implement a scale-aware partial cloudiness scheme for RRTMGBy Sundqvist et al. (1989 ), tested by Mocko and Cotton (1995)Simulates liquid- and ice-water content based on humidity and temperature to represent a “cloud” with radiative properties
5. Addressing issues in RRTMG-cloud connectionFerrier/GFDL radiationFerrier/RRTMG radiationFerrier/RRTMG/part cloudReasonable SW attenuation with partial cloudiness scheme implemented by DTCExcessive SW radiation reaching surface: SAS clouds transparent to RRTMG radiation and lack of stratus representationControl: Reasonable SW attenuation but documented problems in LW
6. ConfigurationHDGFHDRFMicrophysicsFerrierFerrierRadiationGFDLRRTMGRad. Δt1 hour15 minsPartial CloudsnoyesConvectionSASSASPBL/Sfc Layer PhysGFS/GFDLGFS/GFS27 km9 km3 km1/16°EP Ocean DomainATL Ocean DomainOps Suite9 ATL Storms101 Cases9 EP Storms97 Cases
7. AL Track ErrorEP Track ErrorHDRF-HDGF 101 96 85 84 82 76 74 70 64 62 5897 96 95 94 89 86 80 73 69 63 56Neutral track impact for both basinsDistance (km)HDGF HDRF + better HDGF- better HDRF
8. AL Intensity ErrorEP Intensity ErrorMax Wind (kt)Max Wind (kt)AL Intensity BiasEP Intensity BiasMax Wind (kt)Max Wind (kt)+ stronger HDRF- stronger HDGF+ better HDGF- better HDRF101 96 85 84 82 76 74 70 64 62 5897 96 95 94 89 86 80 73 69 63 56101 96 85 84 82 76 74 70 64 62 5897 96 95 94 89 86 80 73 69 63 56HDGF HDRF
9. Mega DomainVerification against GFS Analysis0.25°× 0.25°
10. Mega DomainHDGF BiasPressure Level (hPa)Forecast HourPressure Level (hPa)Pressure Level (hPa)Mega DomainForecast HourHDRF –HDGF BiasToo low at upper levels and too high at low levelsToo cold and humid in lower troposphereExperiment is warmerExperiment has higher heights aloft, lower heights a low levelsLess warm, more humid at 850HGTRHTMP
11. RMSE Percent ErrorControl Error – Experiment ErrorControl ErrorHeight is improved at upper levels and 1000 hPa, but degraded in mid trop.Mega DomainHGTRHTMPMid tropospheric Temp is degradedLow-level heat and moisture are improved
12. ATL AreaEP AreaHGTRHTMPPercent ErrorMore improvement, or less degradation in EP than ATL
13. HDGF BIASHDRF BIASDIFF RMSE(HDGF-HDRF)HDGF RMSE
14. HDRF improves low-level tempHDGF BIASHDRF BIASHDGF RMSEDIFF RMSEHDRF Degrades HDRF Improves1000 hPa Temp (K)
15. HDGF BIASHDRF BIASHDGF RMSEDIFF RMSEHDRF Degrades HDRF Improves850 hPa Temp (K)
16. HDRF improves low level RH nearly everywhere by decreasing RHImprovementHDGF BIASHDRF BIASHDGF RMSEDIFF RMSEHDRF Degrades HDRF Improves1000 hPa RH (%)
17. HDRF Improves moisture in EPHDGF BIASHDRF BIASHDGF RMSEDIFF RMSEHDRF Degrades HDRF Improves850 hPa RH (%)
18. ConclusionHWRF was tested with an alternate radiation package, exchanging the GFDL radiation scheme for the RRTMG scheme, partial cloudiness, and a more frequent physics time stepTC intensity forecasts improved very slightly in HDRF at longer lead times in the EP, and had mixed results for ATL stormsTC track forecasts were left virtually unchanged from the control experiment
19. ConclusionLarge scale verification shows the greatest sensitivity in low level heat and moisture fields, which may play a major role in the improved intensity forecastsThe experiment had fairly neutral impacts except in the lowest levels for temperature and RH, while height at most levels was better in the controlWe expect that the HDRF cloud structure is more realistic and will continue with further diagnostic…RRTMG with partial cloudiness was delivered to EMC and is being tested for 2015 implementation