A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
RapidScat Diurnal Cycles Over Land
RapidScat, which is a Ku-band scatterometer mounted on the International Space Station, observes the Earth's surface in a non-sun-synchronous orbit allowing for different local time-of-day (LTOD) observations as the orbit progresses. The unique orbit and different LTOD observations provide surface observations that are composited to describe the diurnal variability of Ku-band normalized backscatter (\sigma^{0}) measurements over land globally. Previous sun-synchronous scatterometers providing twice-daily surface observations have been used to demonstrate some diurnal changes in \sigma^{0} in several regions globally, but instrument cross-calibration concerns prevent identifying diurnal changes by combining \sigma^{0} observations from multiple sensors. As a result, the full extent of diurnal changes to \sigma^{0} has not been determined until now. In this paper, RapidScat is used to identify diurnal changes to \sigma^{0} globally. Vegetation type is discussed with respect to the diurnal changes in \sigma^{0} regionally. The global diurnal changes to \sigma^{0} are discussed with emphasis on the Amazon, Congo, and Upper Danube river regions. Diurnal cycles are described that could not previously be identified with sun-synchronous instruments. Global means and the magnitude of the diurnal cycle are discussed. With the diurnal changes identified and quantified, RapidScat can be used for future cross-platform calibrations using land targets.
RapidScat Diurnal Cycles Over Land
RapidScat, which is a Ku-band scatterometer mounted on the International Space Station, observes the Earth's surface in a non-sun-synchronous orbit allowing for different local time-of-day (LTOD) observations as the orbit progresses. The unique orbit and different LTOD observations provide surface observations that are composited to describe the diurnal variability of Ku-band normalized backscatter (\sigma^{0}) measurements over land globally. Previous sun-synchronous scatterometers providing twice-daily surface observations have been used to demonstrate some diurnal changes in \sigma^{0} in several regions globally, but instrument cross-calibration concerns prevent identifying diurnal changes by combining \sigma^{0} observations from multiple sensors. As a result, the full extent of diurnal changes to \sigma^{0} has not been determined until now. In this paper, RapidScat is used to identify diurnal changes to \sigma^{0} globally. Vegetation type is discussed with respect to the diurnal changes in \sigma^{0} regionally. The global diurnal changes to \sigma^{0} are discussed with emphasis on the Amazon, Congo, and Upper Danube river regions. Diurnal cycles are described that could not previously be identified with sun-synchronous instruments. Global means and the magnitude of the diurnal cycle are discussed. With the diurnal changes identified and quantified, RapidScat can be used for future cross-platform calibrations using land targets.
RapidScat Diurnal Cycles Over Land
Paget, Aaron C (author) / Long, David G / Madsen, Nathan M
2016
Article (Journal)
English
Local classification TIB:
770/3710/5670
BKL:
38.03
Methoden und Techniken der Geowissenschaften
/
74.41
Luftaufnahmen, Photogrammetrie
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