| Paper: | TH-A1.9 |
| Session: | Applications of Radiometry I |
| Time: | Thursday, March 29, 09:00 - 10:20 |
| Presentation: |
Poster
|
| Topic: |
Theory, physical principles and electromagnetic models: |
| Title: |
GEOPHYSICAL MODEL FUNCTIONS OF OCEAN SURFACE WINDS FOR THE METEOR-M NO. 2 MTVZA-GY RADIOMETER |
| Authors: |
Leonid Mitnik; V. I. Il'iihev Pacific Oceanological Institute | | |
| | Vladimir Kuleshov; V. I. Il'iihev Pacific Oceanological Institute | | |
| | Maia Mitnik; V. I. Il'iihev Pacific Oceanological Institute | | |
| | Michail Pichugin; V. I. Il'iihev Pacific Oceanological Institute | | |
| | Grigory Chernyavsky; Joint Stock Company “Russian Space Systems” | | |
| | Igor Cherny; Joint Stock Company “Russian Space Systems” | | |
| | Oleg Nikitin; Joint Stock Company “Russian Space Systems” | | |
| Abstract: |
The MTVZA-GY microwave radiometer on board the Russian polar-orbiting meteorological satellite Meteor-M No. 2 is designed to provide the simultaneous estimates of the geophysical variables of the underlying surface and atmosphere. The radiometer has 29 channels receiving the outgoing Earth radiation at frequencies f between 10 and 190 GHz. The effective field-of-view size ranges from 89 x 198 km to 9 x 21 km. The incidence angle with respect to the Earth surface S = 65º and the swath width is 1500 km under conical scan geometry. This study explores the sensitivity of the MTVZA-GY brightness temperatures with vertical (V) and horizontal (H) polarizations to the wind-induced ocean surface emissivities at S = 65°. These data are necessary for the brightness temperatures (TBs) simulation, radiometer external calibration and algorithm development for the retrieval of total cloud liquid water content Q, total water vapor content V and wind speed W. To get the dependencies TB(f) = F(W), the MTVZA-GY TBs and satellite-derived sea surface wind products and the various reanalyzes data were collected over the deep extratropical cyclones (ETCs) which were observed in the North Pacific and North Atlantic Oceans in 2014 -2017. Several factors were considered to select the ETC for the subsequent analysis: the time difference between the measurements of MTVZA-GY and other satellites, the ETC size, the presence of the large areas with high winds at the low values of total atmospheric absorption (low rain rate, moderate-low cloud liquid water content and total water vapor content), the ETC movement velocity. Combination of these factors provided the reliable data for the statistical estimates of the TB(f) increments versus wind speed. The high long-term stability of the MTVZA-GY brightness temperatures was determined by comparison with the AMSR2 TBs. The time series of the MTVZA-GY and AMSR2 brightness temperatures at the frequencies f = 10.65, 18.7, 23.8 and 36.5 GHz with V- and H-polarizations were constructed for the test areas in the Amazon rain forests, Eastern Antarctica near Concordia station and Greenland near Geo Summit station over the period of September 2014 - July 2017. The results of the joint processing of the MTVZA-GY, AMSR2, ASCAT, wind products and reanalyzes are presented. They can be used for improvement of the retrieval of geophysical parameters from MTVZA-GY on board Meteor-M No. 2 as well as on the subsequent satellites Meteor-M No. 2-1 (launch in 2017) and Meteor-M No. 2-2 (launch in 2018) which will form together the orbital grouping.
|
