development of amsu fundamental cdrcics.umd.edu/amsu-cdr/presentations_files/amsu... · conclusion...
TRANSCRIPT
![Page 1: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/1.jpg)
Development of AMSU Fundamental CDR
![Page 2: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/2.jpg)
AMSU-A Scan Bias Correction and Verification
Two-point (2P) correction vs. three-point (3P) correction Verification using brightness temperature (FCDR) Verification using L2 products (TCDR)
Background
Goals General methods
Further Studies
Possible source of scan bias Characterization over three reference ranges Asymmetry as a function of observed brightness temperature
AMSU-A Scan Bias Characterization
Attempt to improve 50.3 and 89 GHz results
![Page 3: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/3.jpg)
Goals
Develop Advance Microwave Sounding Unit-A and -B (AMSU-A/-B), and Microwave Humidity Sounder (MHS) FCDR’s for window and water vapor channels AMSU-A: 23.8, 31.4, 50.3 and 89.0 GHz, i.e. Channel 1-3 and 15 AMSU-B/MHS: 89, 150/157; 183.3±1, 183.3±3, 183.3±7/190.3 GHz, i. e. all channels
Develop TCDR’s for hydrological products, i. e., Rain Rate, TPW, CLW, IWP, Snow Cover, SWE, SIC
Presently in Stage One to develop FCDR’s including NOAA-15, 16, 17,18, 19 & MetOp-A L1B data from launch to 2010 (NOAA-15 AMSU-B from 2000 to 2010, due to RFI)
![Page 4: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/4.jpg)
General Methods
AMSU 1b raw count
Ta
Tb
Clear sky AMSU-A/-B/MHS FOV Over tropical/subtropical oceans
ERA interim T, q, O3 profiles; ERA interim SST, 10m U & V;
Geo corrected AMSU LZA, scan angle
Tb
Compare collocated Tb’s with same atmospheric condition for each beam position
CRTM
![Page 5: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/5.jpg)
General Result of Scan Bias Characterization
![Page 6: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/6.jpg)
Explanation and Characterization
AMSU-A scan bias may due to sensor problem including
1. Cross polarization, η 2. Reflector normal angle error, θ 3. Mis-alignment of polarization angle, ψ 4. Sensor scan angle error, φ
Three reference ranges to characterize the scan bias
1. Vicarious cold reference (VCR) 2. Most probable values (MPV) of environmental variables 3. Vicarious hot reference (VHR)
![Page 7: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/7.jpg)
Sensitivity Test of The Sensor Problems
![Page 8: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/8.jpg)
Mean Brightness Temperature over Ocean
![Page 9: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/9.jpg)
Mean Scan Bias over Ocean
![Page 10: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/10.jpg)
Possible Combination of Sensor Error to Explain The Scan Bias
![Page 11: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/11.jpg)
Deeper Survey into VCR Assumption
![Page 12: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/12.jpg)
TELSEM for VHR over Amazon Rain Forest
![Page 13: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/13.jpg)
Observation and Scan Bias of VHR
![Page 14: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/14.jpg)
Correction and Verification
Correction after characterization
1. Asymmetry as a function of observed brightness temperature 2. Two-point (2P) correction vs. three-point (3P) correction
Verification
1. Using brightness temperature (FCDR) 2. Using L2 products (TCDR)
![Page 15: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/15.jpg)
Scan Bias (ASYM) as a Function of Observed Brightness Temperature (TBO)
![Page 16: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/16.jpg)
Verification Using Brightness Temperature for 2P Correction Approach
![Page 17: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/17.jpg)
Verification Using Brightness Temperature for 3P Correction Approach
![Page 18: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/18.jpg)
Verification Using L2 Products
![Page 19: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/19.jpg)
Statistic Angular Comaprison
![Page 20: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/20.jpg)
Attempt to Improve Scan Bias Characterization of 50.3 GHz and 89 GHz Channels
1. Lowest brightness temperature of these two channels appear on Antarctica in southern winter
2. The lowest brightness temperature can be 60 K below VCR results
3. Serious sampling bias due to cross scan in Polar region
4. Plan to exclude some limb beam positions
![Page 21: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/21.jpg)
Location of Extreme BT for 89 GHz Channel, Antarctica
![Page 22: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/22.jpg)
Reference Coldest Brightness Temperature for NOAA-15, 2008
MPV�
VCR�
Lowest Observation�
![Page 23: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/23.jpg)
OBS vs. SIM Brightness Temperature for NOAA-15, 2004
![Page 24: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/24.jpg)
Sampling Bias in Polar Region, Red – Nadir, Blue – Beam Position 30
![Page 25: Development of AMSU Fundamental CDRcics.umd.edu/AMSU-CDR/presentations_files/AMSU... · Conclusion 1. The correction approaches are promising 2. The two channels with lower frequency](https://reader034.vdocuments.net/reader034/viewer/2022042213/5eb7e7d0b3ab442e967c5e54/html5/thumbnails/25.jpg)
Conclusion
1. The correction approaches are promising
2. The two channels with lower frequency have better correction results
3. Correction results may improve with radiative transfer model regarding to more accurate angular representation
4. The assumption that lower brightness contains higher degree of polarization may have some exceptions
5. The asymmetry pattern is stable through years, but quite different among on-board satellites
6. Currently working on inter-satellite calibration