IMPACT OF CYGNSS DATA ON HURRICANE ANALYSES AND FORECASTS IN A REGIONAL OSSE FRAMEWORK

Abstract:

The Cyclone Global Navigation Satellite System, or CYGNSS, is a planned constellation of micro-satellites that utilizes existing GPS satellites to retrieve surface wind speed near the satellites' ground tracks. The orbits are designed such that there is excellent coverage of the tropics and subtropics, resulting in better sampling intervals over tropical cyclones than is possible with current scatterometers. Furthermore, CYGNSS will be able to retrieve winds under all precipitation conditions, and over a large range of wind speeds in a tropical cyclone. Using model output from a high-resolution tropical cyclone nature run as truth, synthetic CYGNSS and aircraft surface wind speed data have been created. The tropical cyclone nature run spans 13 days and is based on European Center for Medium range Weather Forecasting's (ECMWF) joint Observing System Simulation Experiment (OSSE) global nature run. The impact of synthetic CYGNSS wind speed data on Gridpoint Statistical Interpolation (GSI) analyses, and Hurricane Weather Research and Forecast system forecasts (HWRF) will be shown.