The Impact of Assimilating SSM/I and QuikSCAT Satellite Winds on Hurricane Isidore Simulations

Chen, Shu-Hua
February 2007
Monthly Weather Review;Feb2007, Vol. 135 Issue 2, p549
Academic Journal
Three observational datasets of Hurricane Isidore (in 2002) were analyzed and compared: the Special Sensor Microwave Imager (SSM/I), the Quick Scatterometer (QuikSCAT) winds, and dropsonde winds. SSM/I and QuikSCAT winds were on average about 1.9 and 0.3 m s-1 stronger, respectively, than dropsonde winds. With more than 20 000 points of data, SSM/I wind speed was about 2.2 m s-1 stronger than QuikSCAT. Comparison of the wind direction observed by QuikSCAT with those from the dropsondes showed that the quality of QuikSCAT data is good. The effect of assimilating SSM/I wind speeds and/or QuikSCAT wind vectors for the analysis of Hurricane Isidore was assessed using the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5) and its three-dimensional variational data assimilation system. For the Hurricane Isidore case study, it was found that the assimilation of either satellite winds strengthened the cyclonic circulation in the analysis. However, the increment of the QuikSCAT wind analysis is more complicated than that from the SSM/I analysis due to the correction of the storm location, a positive result from the assimilation of wind vectors. The increase in low-level wind speeds enhanced the air–sea interaction processes and improved the simulated intensity for Isidore. In addition, the storm structure was better simulated. Assimilation of QuikSCAT wind vectors clearly improved simulation of the storm track, in particular during the later period of the simulation, but lack of information about the wind direction from SSM/I data prevented it from having much of an effect. Assessing the assimilation of QuikSCAT wind speed versus wind vector data confirmed this hypothesis. The track improvement partially resulted from the relocation of the storm’s initial position after assimilation of the wind vectors. For this case study, it was found that the assimilation of SSM/I or QuikSCAT data had the greatest impact on the Hurricane Isidore simulation during the first 2 days.


Related Articles

  • The Impact of Multisatellite Data on the Initialization and Simulation of Hurricane Lili’s (2002) Rapid Weakening Phase. Zhang, Xiaoyan; Xiao, Qingnong; Fitzpatrick, Patrick J. // Monthly Weather Review;Feb2007, Vol. 135 Issue 2, p526 

    Numerical experiments have been conducted to examine the impact of multisatellite data on the initialization and forecast of the rapid weakening of Hurricane Lili (in 2002) from 0000 UTC to landfall in Louisiana on 1300 UTC 3 October 2002. Fifth-generation Pennsylvania State...

  • First-Year Operation of a New Water Vapor Raman Lidar at the JPL Table Mountain Facility, California. Leblanc, Thierry; McDermid, I. Stuart; Aspey, Robin A. // Journal of Atmospheric & Oceanic Technology;Aug2008, Vol. 25 Issue 8, p1454 

    A new water vapor Raman lidar was recently built at the Table Mountain Facility (TMF) of the Jet Propulsion Laboratory (JPL) in California and more than a year of routine 2-h-long nighttime measurements 4–5 times per week have been completed. The lidar was designed to reach accuracies...

  • On the Differences in Storm Rainfall from Hurricanes Isidore and Lili. Part II: Water Budget. Jiang, Haiyan; Halverson, Jeffrey B.; Simpson, Joanne; Zipser, Edward J. // Weather & Forecasting;Feb2008, Vol. 23 Issue 1, p44 

    Part I of this two-part paper examined the satellite-derived rainfall accumulation and rain potential history of Hurricanes Isidore and Lili (2002). This paper (Part II) uses analyses from the Navy Operational Global Atmospheric Prediction System (NOGAPS) to examine the water budget and...

  • On the Differences in Storm Rainfall from Hurricanes Isidore and Lili. Part I: Satellite Observations and Rain Potential. Jiang, Haiyan; Halverson, Jeffrey B.; Simpson, Joanne // Weather & Forecasting;Feb2008, Vol. 23 Issue 1, p29 

    It has been well known for years that the heavy rain and flooding of tropical cyclones over land bear a weak relationship to the maximum wind intensity. The rainfall accumulation history and rainfall potential history of two North Atlantic hurricanes during 2002 (Isidore and Lili) are examined...

  • A CLIMATOLOGY OF DEEP CONVECTION OVER SOUTH CHINA AND THE ADJACENT WATERS DURING SUMMER. ZHENG Yong-guang; CHEN Jiong // Journal of Tropical Meteorology;Mar2013, Vol. 19 Issue 1, p1 

    Due to the higher temporal and spatial resolution and the better integrality of long-term satellite infrared (IR) Brightness Temperature (TBB) data, a climatology of deep convection during summer over South China and the adjacent waters is presented in this paper based on the 1-hourly infrared...

  • Atmospheric science: Blow by blow.  // Nature;6/5/2008, Vol. 453 Issue 7196, p700 

    The article reports on the increasing rate of heat in the tropical upper troposphere. The atmospheric condition was verified by wind measurements which suggested an increase of warmth below the meeting point of the troposphere and the stratosphere. Meanwhile, it notes that researchers Robert...

  • Trade-Offs between Measurement Accuracy and Resolutions in Configuring Phased-Array Radar Velocity Scans for Ensemble-Based Storm-Scale Data Assimilation. Lu, Huijuan; Xu, Qin // Journal of Applied Meteorology & Climatology;Jun2009, Vol. 48 Issue 6, p1230 

    Assimilation experiments are carried out with simulated radar radial-velocity observations to examine the impacts of observation accuracy and resolutions on storm-scale wind assimilation with an ensemble square root filter (EnSRF) on a storm-resolving grid (Δx = 2 km). In this EnSRF, the...

  • Improved Detection of Severe Storms Using Experimental Fine-Resolution WSR-88D Measurements. Brown, Rodger A.; Flickinger, Bradley A.; Forren, Eddie; Schultz, David M.; Sirmans, Dale; Spencer, Phillip L.; Wood, Vincent T.; Ziegler, Conrad L. // Weather & Forecasting;Feb2005, Vol. 20 Issue 1, p3 

    Doppler velocity and reflectivity measurements from Weather Surveillance Radar-1988 Doppler (WSR-88D) radars provide important input to forecasters as they prepare to issue short-term severe storm and tornado warnings. Current-resolution data collected by the radars have an azimuthal spacing of...

  • Aircraft Observations of the 12-15 July 2004 Moisture Surge Event during the North American Monsoon Experiment. Mejia, John F.; Douglas, Michael W.; Lamb, Peter J. // Monthly Weather Review;Sep2010, Vol. 138 Issue 9, p3498 

    This paper describes aspects of a strong moisture surge over the Gulf of California that was observed during the 2004 North American Monsoon Experiment. Although a variety of special observation platforms aid the analyses, the authors focus on observations collected during two NOAA research...


Read the Article


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

Try another library?
Sign out of this library

Other Topics