TITLE

Observation Sensitivity Calculations Using the Adjoint of the Gridpoint Statistical Interpolation (GSI) Analysis System

AUTHOR(S)
Zhu, Yanqiu; Gelaro, Ronald
PUB. DATE
January 2008
SOURCE
Monthly Weather Review;Jan2008, Vol. 136 Issue 1, p335
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The adjoint of a data assimilation system provides an efficient way of estimating sensitivities of analysis or forecast measures with respect to observations. The NASA Global Modeling and Assimilation Office (GMAO) has developed an exact adjoint of the Gridpoint Statistical Interpolation (GSI) analysis scheme developed at the National Centers for Environmental Prediction (NCEP). The development approach is unique in that the adjoint is derived from a line-by-line tangent linear version of the GSI. Availability of the tangent linear scheme provides an explicit means of assessing not only the fidelity of the adjoint, but also the effects of nonlinear processes in the GSI itself. In this paper, the development of the tangent linear and adjoint versions of the GSI are discussed and observation sensitivity results for a near-operational version of the system are shown. Results indicate that the GSI adjoint provides accurate assessments of the sensitivities with respect to observations of wind, temperature, satellite radiances, and, to a lesser extent, moisture. Sensitivities with respect to ozone observations are quite linear for the ozone fields themselves, but highly nonlinear for other variables. The sensitivity information provided by the adjoint is used to estimate the contribution, or impact, of various observing systems on locally defined response functions based on the analyzed increments of temperature and zonal wind. It is shown, for example, that satellite radiances have the largest impact of all observing systems on the temperature increments over the eastern North Pacific, while conventional observations from rawinsondes and aircraft dominate the impact on the zonal wind increments over the continental United States. The observation impact calculations also provide an additional means of validating the observation sensitivities produced by the GSI adjoint.
ACCESSION #
28791526

 

Related Articles

  • Comparison of Snow Cover from Satellite and Numerical Weather Prediction Models in the Northern Hemisphere and Northern Europe. Hyvärinen, Otto; Eerola, Kalle; Siljamo, Niilo; Koskinen, Jarkko // Journal of Applied Meteorology & Climatology;Jun2009, Vol. 48 Issue 6, p1199 

    Snow cover has a strong effect on the surface and lower atmosphere in NWP models. Because the progress of in situ observations has stalled, satellite-based snow analyses are becoming increasingly important. Currently, there exist several products that operationally map global or continental snow...

  • The role of model and initial condition error in numerical weather forecasting investigated with an observing system simulation experiment. Privé, Nikki C.; Errico, Ronald M. // Tellus: Series A;2013, Vol. 65, p1 

    A series of experiments that explore the roles of model and initial condition error in numerical weather prediction are performed using an observing system simulation experiment (OSSE) framework developed at the National Aeronautics and Space Administration Global Modeling and Assimilation...

  • Impacts of High-Resolution Land Surface Initialization on Regional Sensible Weather Forecasts from the WRF Model. Case, Jonathan L.; Crosson, William L.; Kumar, Sujay V.; Lapenta, William M.; Peters-Lidard, Christa D. // Journal of Hydrometeorology;Dec2008, Vol. 9 Issue 6, p1249 

    This manuscript presents an assessment of daily regional simulations of the Weather Research and Forecasting (WRF) numerical weather prediction (NWP) model initialized with high-resolution land surface data from the NASA Land Information System (LIS) software versus a control WRF configuration...

  • Impacts of Satellite-Observed Winds and Total Precipitable Water on WRF Short-Range Forecasts over the Indian Region during the 2006 Summer Monsoon. Rakesh, V.; Singh, Randhir; Pal, P. K.; Joshi, P. C. // Weather & Forecasting;Dec2009, Vol. 24 Issue 6, p1706 

    Assimilation experiments have been performed with the Weather Research and Forecasting (WRF) model’s three-dimensional variational data assimilation (3DVAR) scheme to assess the impacts of NASA’s Quick Scatterometer (QuikSCAT) near-surface winds, and Special Sensor Microwave Imager...

  • Vertical Moist Thermodynamic Structure and Spatial–Temporal Evolution of the MJO in AIRS Observations. Tian, Baijun; Waliser, Duane E.; Fetzer, Eric J.; Lambrigtsen, Bjorn H.; Yung, Yuk L.; Wang, Bin // Journal of the Atmospheric Sciences;Oct2006, Vol. 63 Issue 10, p2462 

    The atmospheric moisture and temperature profiles from the Atmospheric Infrared Sounder (AIRS)/Advanced Microwave Sounding Unit on the NASA Aqua mission, in combination with the precipitation from the Tropical Rainfall Measuring Mission (TRMM), are employed to study the vertical moist...

  • Local Data Integration over East-Central Florida Using the ARPS Data Analysis System. Case, Jonathan L.; Manobianco, John; Oram, Timothy D.; Garner, Tim; Blottman, Peter F.; Spratt, Scott M. // Weather & Forecasting;Feb2002, Vol. 17 Issue 1, p3 

    The Applied Meteorology Unit has configured the Advanced Regional Prediction System (ARPS) Data Analysis System (ADAS) to support operational short-range weather forecasting over east-central Florida, including the Kennedy Space Center and Cape Canaveral Air Force Station. The ADAS was modified...

  • Cockpit weather system.  // Presidents & Prime Ministers;Sep/Oct96, Vol. 5 Issue 5, p32 

    Reports on the evaluation of a US National Aeronautics and Space Administration-developed DC-10 equipped with a cockpit weather system and other technologies. Provision of up-to-date graphical weather data to flight crews; Ability to construct color graphic and moving and textual displays.

  • Operation: Ontario storm watch. Stuart, Ryan // Ski Canada;Fall2012, Vol. 41 Issue 2, p10 

    The article informs about a flying mission in Ontario undertaken by the U.S. National Aeronautics and Space Administration (NASA) with Environment Canada to calibrate and test radar and satellite technology to improve snowfall forecasting.

  • Spotty, strong convection seen in NASA imagery helps Irwin regain tropical storm status.  // Biomedical Market Newsletter;10/17/2011, Vol. 21, p521 

    The article reports that tropical storm Irwin has regained its storm status, as seen in National Aeronautics & Space Administration (NASA) imagery.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics