Research on sea surface temperature retrieval by the one-dimensional synthetic aperture microwave radiometer, 1D-SAMR

2020 ◽  
Vol 39 (5) ◽  
pp. 115-122
Author(s):  
Weihua Ai ◽  
Mengyan Feng ◽  
Guanyu Chen ◽  
Wen Lu
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Microwave Radiometer ◽  
Sea Surface ◽  
Synthetic Aperture ◽  
One Dimensional ◽  
The One ◽  
Temperature Retrieval

A Multiple Linear Regression Algorithm for Sea Surface Temperature Retrieval by One-Dimensional Synthetic Aperture Microwave Radiometry

2020 ◽  
Vol 37 (9) ◽  
pp. 1753-1761
Author(s):  
Mengyan Feng ◽  
Weihua Ai ◽  
Guanyu Chen ◽  
Wen Lu ◽  
Shuo Ma
Keyword(s):  
Linear Regression ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Multiple Linear Regression ◽  
Incidence Angle ◽  
Regression Method ◽  
Sea Surface ◽  
Synthetic Aperture ◽  
Linear Regression Method ◽  
One Dimensional

AbstractOne-dimensional synthetic aperture microwave radiometer (1D-SAMR) can provide remote sensing images at a higher spatial resolution than those from traditional real aperture microwave radiometers. As 1D-SAMR operates at multiple incidence angles, we proposed a multiple linear regression method to retrieve sea surface temperature at an incidence angle between 0° and 65°. Assuming that a 1D-SAMR operates at various frequencies (i.e., 6.9, 10.65, 18.7, 23.8 and 36.5 GHz), a radiation transmission forward model was developed to simulate the brightness temperature measured by the 1D-SAMR. The sensitivity of the five frequencies to sea surface temperature was examined, and we evaluated the reliability of the regression method proposed in this study. Furthermore, 11 schemes with various frequency combinations were applied to retrieve sea surface temperature. The results showed that the five-frequency combination scheme performed better than the other schemes. This study also found that the accuracy of retrieved sea surface temperature is dependent on incidence angles. Finally, we suggested that the incidence angle range of the 1D-SAMR is necessary to be 30°–60° based on the relationship between the accuracy of retrieved sea surface temperature and the incidence angles.

scholarly journals Sea Surface Temperature Retrieval from the First Korean Geostationary Satellite COMS Data: Validation and Error Assessment

2018 ◽  
Vol 10 (12) ◽  
pp. 1916 ◽  
Author(s):  
Hye-Jin Woo ◽  
Kyung-Ae Park ◽  
Xiaofeng Li ◽  
Eun-Young Lee
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Geostationary Satellite ◽  
Sea Surface ◽  
Surface Drifter ◽  
Temperature Retrieval ◽  
Buoy Data ◽  
Continuous Use ◽  
Meteorological Satellite ◽  
Surface Drifting Buoy

Korea’s first geostationary satellite, the “Communication, Ocean, and Meteorological Satellite” (COMS), has been operating since 2010. The Meteorological Imager (MI), an sensor on-board the COMS, has observed sea-surface radiances for the estimation of sea surface temperature (SST) in the western Pacific Ocean and eastern Indian Ocean. To derive the SST coefficients of COMS, quality-controlled surface drifting buoy data were collected for the period of April 2011 to March 2015. A collocation procedure between COMS/MI data and the surface drifter data produced a matchup database for 4 years from 2011 to 2015. The coefficients for the COMS/MI SST were derived by applying appropriate algorithms, i.e., the Multi-channel SST (MCSST) and Non-linear SST (NLSST) algorithms, for daytime and nighttime data using a regression method. Validation results suggest the possibility of the continuous use of the coefficients as representative SST coefficients of COMS. The estimated SSTs near the edge of a full disk with high satellite zenith angles over 60° revealed relatively large errors compared to drifter temperatures. Most of NLSST formulations exhibited overestimation of SSTs at low SSTs (<10 °C). This study suggests an approach by which SST can be measured accurately in order to contribute to tracking climate change.

scholarly journals Sea surface temperature changes due to polar lows over the Nordic Seas

2020 ◽  
Vol 65 (4) ◽  
Author(s):  
Pavel A. Golubkin ◽  
◽  
Julia E. Smirnova ◽  
Vsevolod S. Kolyada ◽  
◽  
...  
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Microwave Radiometer ◽  
Surface Wind ◽  
Sea Surface ◽  
Polar Lows ◽  
Wind Speeds ◽  
Sea Surface Wind ◽  
Polar Low ◽  
Upper Mixed Layer

In this study possible changes in sea surface temperature (SST) caused by passage of polar lows and analyzed. Polar lows are extreme atmospheric phenomena inherent to high latitudes. They develop sea surface wind speeds from 15 m/s up to hurricane force values and are characterized by small sizes (on average, 300 km) and lifetimes (less than two days), which complicates their detection and studies. It is assumed that as in case of tropical cyclones, which may considerably lower SST due to intense mixing and entrainment of colder waters to the ocean upper mixed layer, polar lows could similarly influence SST. Moreover, in the high latitude areas, where salt stratification may be present instead of temperature stratification, SST may increase due to mixing with deeper warmer layer. In this study 330 polar lows were analyzed using satellite passive microwave radiometer measurements of SST. In result, 47 cases when average SST values changed in polar low forcing areas were found. Out of these cases, in six cases SST increase of at least 0.5 °С was found, and in fifteen cases SST decrease of at least 0.5 °С was found. This indicates that upper ocean response to polar lows is quite rare phenomenon, which should be further analyzed along with its possible role in the ocean-ice-atmosphere system.

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