A STUDY OF THE NOAA NEAR-NADIR MICROWAVE HUMIDITY SOUNDER BRIGHTNESS TEMPERATURES OVER ANTARCTICA <br />Tsan Mo, Yong Han...
7/29/2011<br />IEE IGARSS 2011<br />2<br />INTRODUCTION<br />●Antarctica:  Long winter months with ~24-hour nighttime<br /...
7/29/2011<br />IEE IGARSS 2011<br />3<br />Microwave Humidity Sounder (MHS)<br />●  MHS (built by EUMETSAT) has flown onbo...
Local Equatorial Crossing Times (LECT) & Operational Statuses of the NOAA and METOP Satellites <br />7/29/2011<br />IEE IG...
NOAA-19 On-orbit Verification of NE∆T:AMSU-A (Ch.1-15) and MHS (Ch.16-20)<br />7/29/2011<br />IEE IGARSS 2011<br />5<br />
Long-Term Monitoring of Instrument Performance for Life <br />●  Instrument performances are continuously monitored for li...
NOAA-18 MHS NE∆T & Ch.Gain<br />7/29/2011<br />IEE IGARSS 2011<br />7<br />NE∆T (K)<br />
NOAA-19 MHS NE∆T & Ch.Gain<br />7/29/2011<br />IEE IGARSS 2011<br />8<br />NE∆T (K)<br />
NOAA-18 MHS Ch. 1<br />NE∆T:<br />●  Ten days<br />●  Thirty days<br />●  One Year<br />●  Life time since launch <br />7/...
● Ascending (++) and descending (xx) <br />30-day mean  MHS  BT near nadir from NOAA-18 & NOAA-19  <br />● Feb. 10 – Dec. ...
(a) ∆T=Ascending – Descending(b) ∆T=NOAA18-NOAA19<br />●Little diurnal effect during the Antarctic winter months <br />● I...
Ascending Local Equator Crossing Time (LECT)<br />7/29/2011<br />IEE IGARSS 2011<br />12<br />
●<br />7/29/2011<br />IEE IGARSS 2011<br />13<br />AMSU-A:<br />∆T= NOAA18 –NOAA19<br />   Differences of 30-day mean brig...
7/29/2011<br />IEE IGARSS 2011<br />14<br />Summary<br />● BOTH AMSU-A and MHS BT over Antarctica show that 	there is mini...
REFERENCES<br />● Tsan Mo, “Calibration of the NOAA AMSU-A Radiometers With Natural Test Sites,” IEEE Transe. Geosci. Remo...
7/29/2011<br />IEE IGARSS 2011<br />16<br />Thank You<br />
Climate Trends from NOAA-15 AMSU-A Measurements<br />7/29/2011<br />IEE IGARSS 2011<br />17<br />●Channel 15 measurements ...
NOAA-18 AMSU-A<br />NE∆T<br />7/29/2011<br />IEE IGARSS 2011<br />18<br />
7/29/2011<br />IEE IGARSS 2011<br />19<br />MHS NEEAR-NADIR MEASUREMENTS OVER ANTARCTICA <br />● Ascending and descending ...
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FR1.T03.1 Meeting Slides of MHS_TB over Antarctica_7_29_11.pptx

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FR1.T03.1 Meeting Slides of MHS_TB over Antarctica_7_29_11.pptx

  1. 1.  A STUDY OF THE NOAA NEAR-NADIR MICROWAVE HUMIDITY SOUNDER BRIGHTNESS TEMPERATURES OVER ANTARCTICA <br />Tsan Mo, Yong Han, and FuzhongWeng<br />NOAA/NESDIS<br />Center for Satellite Applications and Research (STAR)<br />IEEE IGARSS, <br />Vancouver, Canada<br />July 29, 2011<br />
  2. 2. 7/29/2011<br />IEE IGARSS 2011<br />2<br />INTRODUCTION<br />●Antarctica: Long winter months with ~24-hour nighttime<br />● Minimal diurnal variability in data<br />● Data used in this report: <br />NOAA-18 and NOAA-19 MHS over Antarctica (82o-70oS)<br /> NOAA-18 and NOAA-19 AMSU-A over Antarctica<br />● Ascending and Descendingtime series <br />● 30-day mean near-nadir bright temperatures (BT) <br />● ∆T =(Ascending - Descending) to demonstrate diurnal effect<br />● ∆T = (NOAA18 - NOAA19) to determine Intersatellite/intersensor Calibration Bias (ICB)<br />
  3. 3. 7/29/2011<br />IEE IGARSS 2011<br />3<br />Microwave Humidity Sounder (MHS)<br />● MHS (built by EUMETSAT) has flown onboard NOAA-18, NOAA-19, and MEOP-A since May 20, 2005<br />● MHS central channel frequencies <br />
  4. 4. Local Equatorial Crossing Times (LECT) & Operational Statuses of the NOAA and METOP Satellites <br />7/29/2011<br />IEE IGARSS 2011<br />4<br />
  5. 5. NOAA-19 On-orbit Verification of NE∆T:AMSU-A (Ch.1-15) and MHS (Ch.16-20)<br />7/29/2011<br />IEE IGARSS 2011<br />5<br />
  6. 6. Long-Term Monitoring of Instrument Performance for Life <br />● Instrument performances are continuously monitored for life of mission<br />● Calibration counts, NE∆T, and housekeeping sensors are monitored and posted on NOAA/STAR Online Monitoring Website<br />● Sample results are shown on following slides<br />7/29/2011<br />IEE IGARSS 2011<br />6<br />
  7. 7. NOAA-18 MHS NE∆T & Ch.Gain<br />7/29/2011<br />IEE IGARSS 2011<br />7<br />NE∆T (K)<br />
  8. 8. NOAA-19 MHS NE∆T & Ch.Gain<br />7/29/2011<br />IEE IGARSS 2011<br />8<br />NE∆T (K)<br />
  9. 9. NOAA-18 MHS Ch. 1<br />NE∆T:<br />● Ten days<br />● Thirty days<br />● One Year<br />● Life time since launch <br />7/29/2011<br />IEE IGARSS 2011<br />9<br />
  10. 10. ● Ascending (++) and descending (xx) <br />30-day mean MHS BT near nadir from NOAA-18 & NOAA-19 <br />● Feb. 10 – Dec. 31, 2009 over Antarctica. <br />● NOAA-19 was launched on Feb. 6, 2009.<br />7/29/2011<br />IEE IGARSS 2011<br />10<br />NOAA-18 and NOAA -19 MHS BT Over ANTARCTICA<br />
  11. 11. (a) ∆T=Ascending – Descending(b) ∆T=NOAA18-NOAA19<br />●Little diurnal effect during the Antarctic winter months <br />● ICBs (defined as mean over days of <br />90- 240) are small<br />● NOAA-19 data are available only after day 40 as it was launched on 6 February 2009<br />7/29/2011<br />IEE IGARSS 2011<br />11<br />
  12. 12. Ascending Local Equator Crossing Time (LECT)<br />7/29/2011<br />IEE IGARSS 2011<br />12<br />
  13. 13. ●<br />7/29/2011<br />IEE IGARSS 2011<br />13<br />AMSU-A:<br />∆T= NOAA18 –NOAA19<br /> Differences of 30-day mean brightness temperatures between NOAA-18 and NOAA-19 measurements at nadir over Antarctica. The NOAA-19 data are available only after day 40 as it was launched on 6 February 2009.<br />● Relative channel biases, which are defined as the mean ΔT values over July when the Antarctica is nearly 24-hour nighttime<br />● The vertical lines indicate the inter-year location.<br />
  14. 14. 7/29/2011<br />IEE IGARSS 2011<br />14<br />Summary<br />● BOTH AMSU-A and MHS BT over Antarctica show that there is minimal diurnal variability in the winter months with 24-hour nighttime<br />● These measurements over Antarctica provide a practical approach to determine the Intersatellite/intersensor Calibration Biases (ICBs)<br />● It shows that Antarctica is good natural site for cal/val of space-borne microwave radiometers (MR)<br />● Establishment of a natural site for calibration reference is an important addition to the few tools available to date for cal/val of space-borne MR<br />
  15. 15. REFERENCES<br />● Tsan Mo, “Calibration of the NOAA AMSU-A Radiometers With Natural Test Sites,” IEEE Transe. Geosci. Remote Sens., 2011, in press<br />● Tsan Mo,"A Study of the NOAA Near-Nadir AMSU-A Brightness Temperatures over Antarctica, " J. Atmospheric and Oceanic Technology,  27, 995-1004, DOI: 10.1175/2010JTECHA1417.1, June 2010.<br />● STAR Online Monitoring Website: (N. Sun, STAR Webmaster)<br />http://www.star.nesdis.noaa.gov/smcd/spb/icvs/satmonitoring_n19_amax.php<br />7/29/2011<br />IEE IGARSS 2011<br />15<br />
  16. 16. 7/29/2011<br />IEE IGARSS 2011<br />16<br />Thank You<br />
  17. 17. Climate Trends from NOAA-15 AMSU-A Measurements<br />7/29/2011<br />IEE IGARSS 2011<br />17<br />●Channel 15 measurements are closest to the Earth’s surface<br />●Channel 9 measurements are near the tropopause.<br />●Channels 15 and 1-8 measurements are at multiple levels in troposphere <br />●Channels 10-14 measurements are at multiple levels in stratosphere<br />●The chart on the right shows the climate trends at multiple levels of atmosphere from 0 to 50 km.<br />●Troposphere is warming and stratosphere is cooling<br />NOAA-15 AMSU-A Data from May 1998 through Dec. 2007 are used to derive these trends. Data at Channels 6 and 11 are not used due to channel failures<br />T. Mo, (2009), JGR, 114, D11110<br />
  18. 18. NOAA-18 AMSU-A<br />NE∆T<br />7/29/2011<br />IEE IGARSS 2011<br />18<br />
  19. 19. 7/29/2011<br />IEE IGARSS 2011<br />19<br />MHS NEEAR-NADIR MEASUREMENTS OVER ANTARCTICA <br />● Ascending and descending 30-day MHS mean brightness temperatures near nadir from: <br /> (a) NOAA-18, <br /> (b) NOAA-19, and <br /> (c) METOP-A measurements over Antarctica in 2010. <br />
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