Improved Hurricane Wind Speed Algorithm for the SeaWinds Satellite Scatterometer
نویسندگان
چکیده
Abszracl-Satellite microwave scatterometer wind retrievals, given in the standard product (e.g., QuikSCAT LZB), badly underestimate the peak wind speed in tropical cyclones. One important reason is that the effects of precipitation on the normalized radar cross section sigma-0 are neglected in the processing algorithms. This paper presents results of a first attempt to provide sigma-0 corrections, which account for the atmospheric attenuation of the rain. Atmospheric transmissivity is derived from the QuikSCAT Radiometer ( Q W ) excess brightness temperatures taken simultaneously with sigma-0 measurements. When applied, retrieved wind speeds show improved agreement with numerical hurricane models (PSUINCAR MMS) where there is moderate to high rainfall.
منابع مشابه
A Non-MLE Approach for Satellite Scatterometer Wind Vector Retrievals in Tropical Cyclones
Satellite microwave scatterometers are the principal source of global synoptic-scale ocean vector wind (OVW) measurements for a number of scientific and operational oceanic wind applications. However, for extreme wind events such as tropical cyclones, their performance is significantly degraded. This paper presents a novel OVW retrieval algorithm for tropical cyclones which improves the accurac...
متن کاملCombined Active/Passive Hurricane Wind Retrieval Algorithm for the Seawinds Scatterometer
Because of their high wind gradient structures, tropical cyclones (TC’s) present a major challenge to space-borne scatterometer measurements of ocean surface wind vectors. Frequently spiral bands of strong rains accompany the high winds, and this precipitation attenuates the ocean backscatter due to wind. Also scattering by the rain volume increases the backscatter measured by the scatterometer...
متن کاملSeawinds Improved Ocean Vector Wind Retrievals in Hurricanes
The most pressing issue for the Ku-band scatterometer is associated with the measurement of ocean surface winds in tropical cyclones in the presence of precipitation, which can significantly degrade the wind vector retrieval. Furthermore, at high wind speeds (> 32 m/s), the measurements suffer from radar backscatter saturation effects. Since the spatial resolution of satellite scatterometer and...
متن کاملMesoscale winds from the new ASCAT scatterometer
Introduction satellite based scatterometers provide high resolution all-weather wind vector fields over the seas. Wind speed and wind direction are provided at high accuracy under all weather conditions. The allweather EsA ERs scatterometer observations have proven its significant impact for the forecasting of fast developing and severe weather. Moreover, scatterometer wind fields are provided ...
متن کاملSensor Synergy of Active and Passive Microwave Instruments for Observations of Marine Surface Winds
An example of sensor synergy of active and passive microwave instruments for observations of marine surface winds is demonstrated using data from the Advanced Earth Observing Satellite-II (ADEOS-II), which carried a Ku-band microwave scatterometer, SeaWinds, and the Advanced Microwave Scanning Radiometer (AMSR). Scalar wind speed observed by AMSR was evaluated by using wind speed observed by Se...
متن کامل