1 / 26

GOES Sounders: Past and Present

GOES Sounders: Past and Present. Applications - Nowcasting - Short-range weather forecasting - Longer-range numerical weather prediction. NESDIS/ORA/ASPT. 12 Infrared Channels (1 Visible Channel) Filter Wheel Radiometer. GOES VAS. Venetian Blinding Not Operational (RISOP)

hien
Download Presentation

GOES Sounders: Past and Present

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GOES Sounders: Past and Present • Applications- Nowcasting - Short-range weather forecasting - Longer-range numerical weather prediction NESDIS/ORA/ASPT

  2. 12 Infrared Channels (1 Visible Channel) Filter Wheel Radiometer GOES VAS Venetian Blinding Not Operational (RISOP) Noisy (due to reduced spin budget)

  3. GOES-8/M Sounder 18 Infrared Channels (1 Visible Channel) Filter Wheel Radiometer • Operational • Higher Signal-to-Noise

  4. GOES Sounder Spectral Bands: 14.7 to 3.7 um & Vis

  5. GOES Sounder Spectral Coverage Current instrument has 18 infrared bands.

  6. Numerical Model Impact Resolutions: Vertical Horizontal Temporal Moisture Ozone Radiances Winds Geostationary Interferometer Cloud Information SST Surface Emissivity

  7. Eta model with and without GOES Sounder Clouds Note that the high clouds off the East Coast were correctly removed when GOES Sounder cloud data were assimilated. Data Assimilation -- Clouds Verifying GOES-8 Imager Infrared Image

  8. The Atmospheric Land Exchange Inverse (ALEXI) model. • The ALEXI models energy exchange between the land surface and the atmospheric boundary layer, driven by remotely sensed inputs. Data Assimilation -- uses GOES Sounder skin temperatures Major ALEXI Inputs Include: 1) Weather Data from CRAS model 2) Radiometric Temperatures from GOES 3) Fraction Vegetation Cover from AVHRR 4) Land Surface Cover Characteristics TRAD(f) = f(f) Tc + [1 - f(f)] Ts z H LE zT Ta Ra TAERO Rx Tc d + z0 Rs T Ts Ta TAERO G Surface component of ALEXI model

  9. Eta Data Assimilation System Satellite Data Impact Study for 3 Seasons Positive Impact due to GOES sounder PW (marine) Positive Impact due to Radiosonde (T and moisture) Ratio = A Ratio greater than 1 means the satellite improved the forecast more than the radiosondes over the entire domain (land and marine) 24-hr forecast for Temperature 24-hr forecast for Relative Humidity In 80 km Eta Data Assimilation System (EDAS), impact of GOES Sounder marine products versus conventional RAOB information was tested. In summer, Sounder has larger positive impact on temperature and moisture forecasts than conventional RAOB. Data Assimilation -- Data Denial

  10. 32 km results using a November 2001 version of the EDAS: • Provide a comparison of the total forecast impact of GOES-vs-POES • data types in the EDAS for late October/early November 2001 • Deny all GOES data types at once. • Deny all POES data types at once. The Diagnostics

  11. GOES in NWP, routine andexperimental: ModelGOES Data NCEP Global Sounder Radiance, Imager Winds, Imager Radiances Eta Model Sounder Radiance, Sounder PW, Imager Winds, Data for LandDataAssimilationScheme, Sounder Clouds FSL’s RUC Sounder TPW, Sounder Clouds (March 2002) GWINDEX rapid-scan winds CIMSS CRAS Sounder PW, Sounder Clouds Australia (LAPS) Imager Winds ECMWF Imager Winds, Imager Radiances GFDL (experimental) Imager Winds NOGAPS Imager Winds, Sounder Winds NAAPS Imager Biomass Fire Product CSU RAMS Imager Biomass Fire Product UW ALEXI Change of Sounder Skin Temperature, Imager insolation Data Assimilation -- GOES radiances and products have a major role

  12. ABS Prime (ABS’) -- consider using the shortwave side of the water vapor band.

  13. GOES Sounder-Derived Cloud Product in the RUC 00 UTC 23 March 1999 GOES Sounder-Derived plus Model-Derived Cloud Top Pressure Impact of the GOES Sounder-Derived Cloud Product (Gray to Black indicate cloud added; Yellow to Red indicate cloud removed by GOES data)

  14. GOES Sounder-Derived Cloud Product in the RUC 00 UTC 23 March 1999 GOES Sounder- Derived Cloud Top Pressure 900 mb 600 300 Model-Derived Cloud Top Pressure

  15. Comparison of GOES-11 PW with microwave retrievals August 6, 2000 Co-located total precipitable water (TPW) values retrieved from the GOES-11 Sounder compare well with integrated moisture measured by a microwave radiometer at the CART site (Lamont, OK). Note “flat” first-guess trace. GOES retrievals show ability to capture the trend and range of total moisture. GOES-11 Post-Launch Test (NOAA Technical #103)

  16. GOES Sounder Uses (non-NWP) • Radiances/Images • Moisture Profiles • Derived Quantities from the retrieved profiles • 3-layers of Precipitable Water • Derived Products Images • Cloud Top Information • Mid-Level Winds • 12 micrometer channel (GOES-12 and beyond) • Possible test-bed for additional imager channels

  17. 12 UTC Sounder LI Zoomed in view: With Eta forecast and watch boxes EXCESSIVE RAINFALL POTENTIAL OUTLOOK HYDROMETEOROLOGICAL PREDICTION CENTER...NWS...CAMP SPRINGS MD GOES SOUNDER DATA SHOWS THAT PWS SOUTH OF THE OUTFLOW BOUNDARY ARE IN THE 1.60 TO 1.70 INCH RANGE. THE SOUNDER DATA ALSO INDICATES THAT THE AIRMASS TO THE WEST ACROSS IL IS CONTINUING TO DESTABILIZE. ALL THE ABOVE ARGUE FOR THE POTENTIAL FOR ISOLD 3 TO 5 INCH RAINFALL BEFORE THE SYSTEM STARTS SHIFTING EWD. Janesville, WI received 4 inches of rain; Sullivan, WI had 3 inches.

  18. NWS Forecast Office Assessment ofGOES Sounder Total Precipitable Water Summer 99 Forecaster assessment of usefulness of changes in hourly TPW product for precipitation forecast Out of 207 weather cases. - Significant Positive Impact (21.3%) - Slight Positive Impact (50.2%) - No Discernible Impact (27%) - Slight Negative Impact (1%) - Significant Negative Impact (<1%) Figure from the National Weather Service, Office of Services

  19. NWS Forecast Office Assessment ofGOES Sounder Atmospheric Instability Summer 99 Forecaster assessment of usefulness of changes in hourly LI, CAPE, & CINH product for predicting location/timing of thunderstorms There were 248 valid weather cases. - Significant Positive Impact (30%) - Slight Positive Impact (49%) - No Discernible Impact (19%) - Slight Negative Impact (2%) - Significant Negative Impact (0) Figure from the National Weather Service, Office of Services

  20. A Derived Product Image of CAPE from the GOES-8 Sounder 00 UTC on 10 August 1999 Stable NOAA NESDIS ORA ARAD ASPT Unstable F-2 Tornado Stable Radiosonde values Geostationary Operational Environmental Satellite (GOES)-8 Sounder Convective Available Potential Energy (CAPE) values. The axis of CAPE values greater than 2500 J/kg extended from eastern Nebraska into southern Minnesota. CAPE values calculated from the 00 UTC radiosondes were too sparse to capture this feature. The two counties outlined in northern Iowa show the location of an F-2 tornado that occurred just over two hours later. A NWS forecaster used Sounder data to help correctly forecast this event.

  21. Example of trends in GOES DPI (time series plots) from 08 August 2000 - a web tool Afternoon destabilization in far W KY Sites selected from GOES Sounder PW DPI at 20 UTC on 08 Aug 2000 Monsoon moisture re-surging in SW AZ

  22. Comparing experimental GOES Sounder and TOMS satellite estimates of Total Ozone (O3) at ground-based sites GOES and TOMS Dobson Units (DU) UW/CIMSS GOES and TOMS (Total Ozone Mapping Spectrometer) show similar accuracies.

  23. GOES Sounder Total Ozone determinations UW/CIMSS

  24. One month average emissivity for 05/11/00 - 06/12/00 at 10 UTC dark blue areas (sfc < 0.80) - missing data 0.98 LW Latitude 0.80 0.98 SW Latitude Current Product Improvement -- improved retrievals with a more rigorous surface emissivity 0.80 Longitude

  25. (~1600) Geostationary Sounders (# of channels) Advanced Baseline Sounder (operational) (~1600) GIFTS (experimental) (18) GOES Sounder (operational) The ABS is the next logical step from experimental low spectral resolution to finally operational high-spectral resolution sounders. (12) VAS (experimental) time

More Related