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Ongoing Major contributions to GSI development All-sky satellite radiance assimilation

NASA/GMAO Activities in Support of JCSDA S. Akella , A. da Silva, C. Draper, R. Errico , D. Holdaway , R. Mahajan , N. Prive , B. Putman , R . Riechle , M. Sienkiewicz, M. Suarez, R. Todling , R.Gelaro. Ongoing Major contributions to GSI development

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Ongoing Major contributions to GSI development All-sky satellite radiance assimilation

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  1. NASA/GMAO Activities in Support of JCSDAS. Akella, A. da Silva, C. Draper, R. Errico, D. Holdaway, R. Mahajan, N. Prive, B. Putman, R. Riechle, M. Sienkiewicz, M. Suarez, R. Todling, R.Gelaro Ongoing • Major contributions to GSI development • All-sky satellite radiance assimilation • Integration of NASA satellite data (TRMM, GPM, MLS, OMPS-LP) • Observation impact studies • Production of new nature run for OSSEs • Staging of data on JIBB machine, hosted by NCCS • Aerosol modules in GFS, for air quality, etc. Possible near-future • SMAP information • Air quality – modified aerosols, reactive chemistry

  2. All-Sky Satellite Radiance AssimilationWill McCarty, Min-Jeong Kim, Dan Holdaway, Ron Errico Status and near-term plans • AMSU-A and MHS cloud-affected MW radiances being assimilated in research mode. • Linearized GEOS-5 microphysics incorporated. • Background and observation errors included for cloud-ice and -liquid control variables. • GSI expanded to assimilate cloud-affected IR radiances using a gray-body assumption. • Current efforts targeted to assimilation of GPM/GMI all-sky radiances. • Use GMAO OSSE framework to examine/refine all-sky methodology and results (observation errors, increment characteristics, ...).

  3. Results for Microwave All-Sky Radiance Assimilation (AMSU-A) 30 June2013 00Z GEOS-5 Background Clouds Observed (GSI-Retrieved) Clouds Cloud Analysis Increments • Increments of vertically integrated cloud water move GEOS-5 background closer to observations Min-Jeong Kim

  4. Will McCarty Used Cloudy Obs for AIRS Ch. 123 (12 m) Expand GSI to include cloud-affected infrared radiances • Essential to expanding the number of observations considered from infrared instruments (~80% of observations at the surface are rejected) • CRTM expanded to incorporate clouds under a gray-body assumption (single, fractionally-covered cloud) • GSI extended to include a flexible cloud height in the analysis: allows adjustment of initial guess • First results suggest errors in GSI cloud detection require further investigation StdDev (Tcloudy – Tclear) at 850 hPa Temperature (K)

  5. Will McCarty Improved Handling of Clouds in the Infrared in GEOS-5/GSI • First assess cloud screening methods used to separate observations affected and unaffected by clouds • Relate errors in cloud detection to analysis statistics and adjointbased observation impacts • Cloud contamination entering the analysis is readily apparent both in terms of the observation departures (cold cloud signal) and adjoint-based observation impacts (degrades 24hr forecast) Obs Departure (O-F, K) Impact per Ob (J/kg) Low Clouds AIRS Channel

  6. Assimilation of TRMM/TMI and GPM/GMI RadiancesJianjun Jin, Will McCarty, Min-Jeong Kim Status and near-term plans • In preparation for assimilating GPM/GMI radiances, GSI has been extended to assimilate TRMM Microwave Imager (TMI) level-1 clear-sky radiances (9 channels: 10.7 - 89 GHz). • GPM is providing GMI radiances in real-time for early development. efforts; scientifically usable data started in mid-April 2014. • GSI has been extended to assimilate GMI clear-sky radiances. • Extension to GMI all-sky radiance assimilation is underway.

  7. Jianjun Jin Assimilation of TMI Radiances in GEOS-5 RMS Obs Departure (K) Mean Obs Departure (K) • TMI clear-sky radiances assimilated in GEOS-5 for the period 15 Mar – 31 May 2012 • Channels 3 – 9 (19 – 89 GHz) • TMI radiance assimilation acts to lessen model precipitation, moving it towards the GPCP retrieved product. Mean Rain Rate 40oN – 40oS (mm/day)

  8. Jianjun Jin TMI and GMI Channel 3 Clear-Sky O-F (K) Assimilation of GMI Radiances in GEOS-5“Plumbing Tests” GPM Orbits TMI and GMI Channel 7 Clear-Sky O-F (K) TRMM Orbits GMI observation departures (O-F) comparable to those for TMI 4 Apr 2014 00z

  9. Adjoint-based Observation ImpactsDan Holdaway, Rahul Mahajan, Ricardo Todling, Jong Kim, Ron Gelaro Status and near-term plans • Routine monitoring in near real time continues... • January 2014 trials include updated physics (cloud scheme, boundary layer, gravity wave drag, radiation) and additional data types (SSMI/S, MetOp-B, S-NPP). • Exploring extension of impact lead time to 48 hrs using Gaussian quadrature (translates to using a single average trajectory, versus two separate trajectories, for model adjoint integration).

  10. GEOS-5 Adjoint-Based 24-h Observation Impacts ALL DATA TYPES Total Impact Observation Count Fraction of Obs that Improve the Forecast

  11. GEOS-5 Adjoint-Based 24-h Observation Impacts SATELLITE RADIANCE PLATFORMS IR MW Total Impact Observation Count Fraction of Obs that Improve the Forecast

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