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Data Assimilation Cycling with GSI and AIRS. Sixth Meeting of the Science Advisory Committee 28 February – 1 March, 2012. National Space Science and Technology Center, Huntsville, AL. transitioning unique NASA data and research technologies to operations. Relevance to SPoRT.

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data assimilation cycling with gsi and airs

Data Assimilation Cycling with GSI and AIRS

Sixth Meeting of the Science Advisory Committee

28 February – 1 March, 2012

National Space Science and Technology Center, Huntsville, AL

transitioning unique NASA data and research technologies to operations

relevance to sport
Relevance to SPoRT
  • SPoRT focuses on improvements to short-term, regional weather forecasts using unique satellite products and capabilities
  • Assimilation of satellite observations to produce improved initial conditions for model simulations
    • AIRS radiances and profiles have shown improvements on the global scale
    • Limited work to show utility on regional scale forecasts
  • GSI provides opportunity to more closely collaborate with operational forecasting, data assimilation, and modeling groups
  • Lessons learned can be applied to other hyperspectral sounders such as IASI (EUMETSAT) or CrIS (NOAA/NASA)

transitioning unique NASA data and research technologies to operations

accomplishments since previous sac
Accomplishments Since Previous SAC
  • “SPoRT should migrate [to] GSI or something more mainstream”
    • GSI adopted as SPoRT system for data assimilation projects
    • Ongoing collaborations to use GSI to improve operational forecasts
  • “SPoRT should evaluate work being done by EMC with IASI for application in regional and local WRF models in preparation for CrIS applications”
    • Modular AIRS (from LANCE) and IASI (from NESDIS) pre-processing for PrepBUFR format to support near-future assimilation within GSI (easy transition to CrIS)
    • All of the projects described herein will eventually use IASI and CrIS profiles within the cycling methodology to produce a more robust system of assimilating
  • Two publications to wrap up work assimilating AIRS in WRF-Var
    • Vertical levels (NWA Journal of Operational Meteorology)
    • AIRS profile assimilation (IEEE TGRS)

transitioning unique NASA data and research technologies to operations

final wrap up of wrf var work
Final Wrap-Up of WRF-Var Work
  • WRF-Var users should select model vertical levels that are representative of the initial conditions and observations to reduce unexpected changes that propagate through the vertical column
  • Evaluation of 37-day case study and single case reveal AIRS profiles increase instability and improve heavy precipitation forecasts

NAM ICs

WRF BKGD

RAOB

37 Levels

50 Levels

transitioning unique NASA data and research technologies to operations

transition to cycled gsi
Transition to Cycled GSI

t00z

tm12

tm12

tm12

tm09

tm09

tm09

tm06

tm06

tm06

tm03

tm03

tm03

tm00

tm00

tm00

84-h fcst

84-h fcst

  • Using Developmental Testbed Center (DTC) GSI code with Chou and Zavodsky attending multi-day tutorial in summer 2010
  • Preprocess profiles into PrepBUFR format using specific QIs
  • Worked with EMC to develop scripts to create a cycled GSI system similar to operational NAM
  • Worked with EMC to make NDAS observation files available in real-time to develop research archive

t06z

t12z

Schematic for GSI scripts (DiMego, personal communication, 2011)

12

18

00

06

12

18

Time (UTC)

transitioning unique NASA data and research technologies to operations

atmospheric rivers
Atmospheric Rivers
  • Only TPW satellite observations available over Pacific to track moisture features; models provide some additional guidance
  • AIRS T and Q AIRS add detail around clouds resulting in more favorable moisture analysis over Pacific than real-time GFS
  • Evaluate integrated WV in specific layers
  • Produce daily real-time, layered moisture analysis products using AIRS, IASI, and CrIS

Total Precipitable Water valid at ~0000 UTC on 2009 October 14

CIRA Blended

GFS

T and Q AIRS

transitioning unique NASA data and research technologies to operations

operational hrrrak
Operational HRRRAK
  • SPoRT approached to assimilate AIRS profile data in Alaska’s High-Resolution Rapid Refresh (HRRRAK) used by WFOs
  • Collaboration with Alaska Region Supercomputing Center (ARSC)
  • Ongoing work to show improved initialization for HRRRAK using AIRS profiles and GSI
  • SPoRT provided near-real-time AIRS profile PREPBUFR files, and guidance on GSI setup and experiment design
  • Eventual project goal is to provide real-time model output to AK WFOs

6h WRF forecast w/ AIRS profiles

GSI analysis w/ AIRS profiles

1000 hPa Temperature Differences (AIRS–CNTL)

transitioning unique NASA data and research technologies to operations

slide8

Limited Impact from AIRS Radiances

Operational

  • Funded by ROSES10 proposal
  • Small percentage of total radiances observed are assimilated
    • Cloud-free radiances only
    • Data reduction
  • Focuses on cloud and surface emissivity checking, quality control, and data reduction
  • Determine which channels are being assimilated in each observation using diagnostics

Clear

Cloudy

Lower levels

impacted by

emissivity

Clear channels

above cloud

Additional

channels

available

above cloud

Proposed

transitioning unique NASA data and research technologies to operations

11

collaborations with jcsda emc
Collaborations with JCSDA/EMC
  • Through previously mentioned proposal, SPoRT has increased collaborations with JCSDA and NCEP/EMC
    • JCSDA works closely with EMC to transition satellite observations into the GFS
    • SPoRT focuses on regional data assimilation and is working to collaborate on a more serious level with EMC’s regional DA group
    • NAM Launcher: offline version of operational NAM available by EMC to select collaborators
    • Goal is to coordinate with EMC to better understand their research challenges and provide R2O support for satellite data sets and capabilities in the NAM

transitioning unique NASA data and research technologies to operations

summary conclusions
Summary/Conclusions
  • SPoRT uses profiles and radiances from hyperspectral sounders to determine the impact of these instruments on sensible weather parameters
    • Research with AIRS retrieved profiles has shown improvements to short-term, regional forecasts
  • Ongoing research projects
    • AIRS 3D moisture product
    • Collaboration with ARSC to bring hyperspectral profile data into HRRRAK
    • Investigation into impact of AIRS radiances using AIRS profiles
  • Lessons learned from AIRS assimilation studies can be used for the assimilation of IASI and CrIS profiles
  • Collaboration with EMC to test NAM Launcher to perform research on impact of other NASA/SPoRT data sets

transitioning unique NASA data and research technologies to operations

future work
Future Work

Suomi NPP launch on October 28, 2011

Vandenberg Air Force Base

  • Short-term plans:
    • Transition 3D moisture analysis product to local and national partners with matching forecast challenges
    • Continue collaborations with ARSC to transition hyperspectral sounder profiles to WFO operations in Alaska
    • Perform targeted research using NAM Launcher in collaboration with JCSDA/EMC
  • Long-term plans (SAC Recommendations requested):
    • Precipitation and land cover (GPM, SMAP)
    • Remotely-sensed winds (WindSat, HIRAD)
    • Lightning data (NALMA; GLM)
    • Dual-polarization radar (collaborate with UAH)

Suomi NPP

transitioning unique NASA data and research technologies to operations