The effect of atmospheric stability on microwave excess emissivity due to wind
نویسندگان
چکیده
The excess microwave emissivity of the ocean surface due to winds at nadir incidence is derived from the TOPEX microwave radiometer and altimeter together with ocean surface data. The sensitivity of emissivity to wind speed is found to depend strongly on the air–sea temperature difference.
منابع مشابه
WindSat Ocean Surface Emissivity Dependence on Wind Speed in Tropical Cyclones
Radiometers are adept at retrieving near surface ocean wind vectors. The Naval Research Laboratory (NRL) launched the WindSat polarimetric radiometer with five frequency channels to observe the sea surface and test its ability to accurately measure the wind in various weather conditions. This study focuses on its performance in extreme conditions – the high wind and heavy precipitation of a tro...
متن کاملPolarimetric Observations of the Emissivity of Whitecaps Experiment (POEWEX’ 04) to Characterize the Azimuthal Variation of the Microwave Emission from Foam Generated by Breaking Waves
WindSat, the first polarimetric microwave radiometer on orbit, and the NPOESS Conical Microwave Imager/Sounder, scheduled for launch in 2010, are both designed to retrieve the ocean surface wind vector from radiometric brightness temperatures. Available observations and models show that the wind direction signal is only 1-3 K peak-to-peak at 19 and 37 GHz, much smaller than the wind speed signa...
متن کاملDevelopment of Global Land Surface Emissivity Map at Amsr-e Passive Microwave Frequencies
Microwave emissivity over ocean is relatively well understood by scientists. However, over land because of the existence of different land covers and their various physical properties land surface emissivity retrieval does not seem to be straightforward. Land emissivity plays a key role in Numerical Weather Prediction (NWP) models, since it acts like a crucial boundary condition. The accuracy o...
متن کاملA modified model for specular sea surface emissivity at microwave frequencies
Modifications to the [14] model for specular ocean emissivity have recently been suggested by [7] in order to improve the performance at high microwave frequencies. The work presented here tests both the original and modified models using a set of satellite and ground-based observations that is designed to eliminate as much as possible the dependence of the test on parameters other than the sur...
متن کاملتغییر آبوهوا و مخاطرات آبوهوایی شهر تهران
Tehran, in the south of Alborz Mountains, is faced with three types of weather risk, weather risk caused by geography, climatic risks caused by air resistance and weather risk due to global warming. The aim of this study is to examine the three types of risk in Tehran. The method of this study was to evaluate the changes of synoptic factors that affect global warming and urban development. In o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- IEEE Trans. Geoscience and Remote Sensing
دوره 39 شماره
صفحات -
تاریخ انتشار 2001