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A STUDY OF THE NOAA NEAR-NADIR MICROWAVE HUMIDITY SOUNDER BRIGHTNESS TEMPERATURES OVER ANTARCTICA

A STUDY OF THE NOAA NEAR-NADIR MICROWAVE HUMIDITY SOUNDER BRIGHTNESS TEMPERATURES OVER ANTARCTICA. Tsan Mo, Yong Han, and Fuzhong Weng NOAA/NESDIS Center for Satellite Applications and Research (STAR) IEEE I GARSS, Vancouver, Canada July 29, 2011. INTRODUCTION.

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A STUDY OF THE NOAA NEAR-NADIR MICROWAVE HUMIDITY SOUNDER BRIGHTNESS TEMPERATURES OVER ANTARCTICA

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  1. A STUDY OF THE NOAA NEAR-NADIR MICROWAVE HUMIDITY SOUNDER BRIGHTNESS TEMPERATURES OVER ANTARCTICA Tsan Mo, Yong Han, and FuzhongWeng NOAA/NESDIS Center for Satellite Applications and Research (STAR) IEEE IGARSS, Vancouver, Canada July 29, 2011

  2. INTRODUCTION ●Antarctica: Long winter months with ~24-hour nighttime ● Minimal diurnal variability in data ● Data used in this report: NOAA-18 and NOAA-19 MHS over Antarctica (82o-70oS) NOAA-18 and NOAA-19 AMSU-A over Antarctica ● Ascending and Descendingtime series ● 30-day mean near-nadir bright temperatures (BT) ● ∆T =(Ascending - Descending) to demonstrate diurnal effect ● ∆T = (NOAA18 - NOAA19) to determine Intersatellite/intersensor Calibration Bias (ICB) IEE IGARSS 2011

  3. Microwave Humidity Sounder (MHS) ● MHS (built by EUMETSAT) has flown onboard NOAA-18, NOAA-19, and MEOP-A since May 20, 2005 ● MHS central channel frequencies IEE IGARSS 2011

  4. Local Equatorial Crossing Times (LECT) & Operational Statuses of the NOAA and METOP Satellites IEE IGARSS 2011

  5. NOAA-19 On-orbit Verification of NE∆T:AMSU-A (Ch.1-15) and MHS (Ch.16-20) IEE IGARSS 2011

  6. Long-Term Monitoring of Instrument Performance for Life ● Instrument performances are continuously monitored for life of mission ● Calibration counts, NE∆T, and housekeeping sensors are monitored and posted on NOAA/STAR Online Monitoring Website ● Sample results are shown on following slides IEE IGARSS 2011

  7. NOAA-18 MHS NE∆T & Ch.Gain NE∆T (K) IEE IGARSS 2011

  8. NOAA-19 MHS NE∆T & Ch.Gain NE∆T (K) IEE IGARSS 2011

  9. NOAA-18 MHS Ch. 1 NE∆T: ● Ten days ● Thirty days ● One Year ● Life time since launch IEE IGARSS 2011

  10. NOAA-18 and NOAA -19 MHS BT Over ANTARCTICA ● Ascending (++) and descending (xx) 30-day mean MHS BT near nadir from NOAA-18 & NOAA-19 ● Feb. 10 – Dec. 31, 2009 over Antarctica. ● NOAA-19 was launched on Feb. 6, 2009. IEE IGARSS 2011

  11. (a) ∆T=Ascending – Descending(b) ∆T=NOAA18-NOAA19 ●Little diurnal effect during the Antarctic winter months ● ICBs (defined as mean over days of 90- 240) are small ● NOAA-19 data are available only after day 40 as it was launched on 6 February 2009 IEE IGARSS 2011

  12. Ascending Local Equator Crossing Time (LECT) IEE IGARSS 2011

  13. AMSU-A: ∆T= NOAA18 –NOAA19 ● 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. ● Relative channel biases, which are defined as the mean ΔT values over July when the Antarctica is nearly 24-hour nighttime ● The vertical lines indicate the inter-year location. IEE IGARSS 2011

  14. Summary ● BOTH AMSU-A and MHS BT over Antarctica show that there is minimal diurnal variability in the winter months with 24-hour nighttime ● These measurements over Antarctica provide a practical approach to determine the Intersatellite/intersensor Calibration Biases (ICBs) ● It shows that Antarctica is good natural site for cal/val of space-borne microwave radiometers (MR) ● 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 IEE IGARSS 2011

  15. REFERENCES ● Tsan Mo, “Calibration of the NOAA AMSU-A Radiometers With Natural Test Sites,” IEEE Transe. Geosci. Remote Sens., 2011, in press ● 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. ● STAR Online Monitoring Website: (N. Sun, STAR Webmaster) http://www.star.nesdis.noaa.gov/smcd/spb/icvs/satmonitoring_n19_amax.php IEE IGARSS 2011

  16. Thank You IEE IGARSS 2011

  17. Climate Trends from NOAA-15 AMSU-A Measurements ●Channel 15 measurements are closest to the Earth’s surface ●Channel 9 measurements are near the tropopause. ●Channels 15 and 1-8 measurements are at multiple levels in troposphere ●Channels 10-14 measurements are at multiple levels in stratosphere ●The chart on the right shows the climate trends at multiple levels of atmosphere from 0 to 50 km. ●Troposphere is warming and stratosphere is cooling 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 T. Mo, (2009), JGR, 114, D11110 IEE IGARSS 2011

  18. NOAA-18 AMSU-A NE∆T IEE IGARSS 2011

  19. MHS NEEAR-NADIR MEASUREMENTS OVER ANTARCTICA ● Ascending and descending 30-day MHS mean brightness temperatures near nadir from: (a) NOAA-18, (b) NOAA-19, and (c) METOP-A measurements over Antarctica in 2010. IEE IGARSS 2011

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