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Analysis of Ku- and Ka-Band Sea Surface Backscattering Characteristics at Low-Incidence Angles Based on the GPM Dual-Frequency Precipitation Radar Measurements.
- Source :
- Remote Sensing; Apr2019, Vol. 11 Issue 7, p754-754, 1p
- Publication Year :
- 2019
-
Abstract
- The co-located normalized radar backscatter cross section measurements from the Global Precipitation Measurement (GPM) Ku/Ka-band dual-frequency precipitation radar (DPR) and sea surface wind; wave and temperature observations from the National Data Buoy Center (NDBC) moored buoys are used to analyze the dependence and sensitivity of Ku- and Ka-band backscatter on surface conditions at low-incidence angles. Then the potential for inverting wind and wave parameters directly from low-incidence σ<superscript>0</superscript> measurements is discussed. The results show that the KaPR σ<superscript>0</superscript> is more sensitive to surface conditions than the KuPR σ<superscript>0</superscript> overall. Nevertheless; both the KuPR σ<superscript>0</superscript> and KaPR σ<superscript>0</superscript> are strongly correlated with wind speed (U<subscript>10</subscript>) and average wave steepness (δ<subscript>a</subscript>) with the exception of specific transitional incidence angles. Moreover, U<subscript>10</subscript> and δ<subscript>a</subscript> could be retrieved from pointwise σ<superscript>0</superscript> near nadir and near 18°. Near 18°; wind direction information is needed as the effect of wind direction on σ<superscript>0</superscript> becomes increasingly significant with incidence angle. To improve the performance of U<subscript>10</subscript> retrieval; especially for low U<subscript>10</subscript>; auxiliary δ<subscript>a</subscript> information would be most helpful; and sea surface temperature is better taken into account. Other wave parameters; such as significant wave height; wave period and wave age; are partly correlated with σ<superscript>0</superscript>. It is generally more difficult to retrieve those parameters directly from pointwise σ<superscript>0</superscript>. For the retrieval of those wave parameters; various auxiliary information is needed. Wind direction and wave direction cannot be retrieved from pointwise σ<superscript>0</superscript>. [ABSTRACT FROM AUTHOR]
- Subjects :
- METEOROLOGICAL precipitation
BACKSCATTERING
RADAR
OCEAN waves
REMOTE sensing
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Volume :
- 11
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Remote Sensing
- Publication Type :
- Academic Journal
- Accession number :
- 135898852
- Full Text :
- https://doi.org/10.3390/rs11070754