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

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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
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    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)
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    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
  • 4. Local Equatorial Crossing Times (LECT) & Operational Statuses of the NOAA and METOP Satellites
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  • 5. NOAA-19 On-orbit Verification of NE∆T:AMSU-A (Ch.1-15) and MHS (Ch.16-20)
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  • 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
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  • 7. NOAA-18 MHS NE∆T & Ch.Gain
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    NE∆T (K)
  • 8. NOAA-19 MHS NE∆T & Ch.Gain
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    NE∆T (K)
  • 9. NOAA-18 MHS Ch. 1
    NE∆T:
    ● Ten days
    ● Thirty days
    ● One Year
    ● Life time since launch
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  • 10. ● 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.
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    NOAA-18 and NOAA -19 MHS BT Over ANTARCTICA
  • 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
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  • 12. Ascending Local Equator Crossing Time (LECT)
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  • 13.
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    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.
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    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
  • 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
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    Thank You
  • 17. Climate Trends from NOAA-15 AMSU-A Measurements
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    ●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
  • 18. NOAA-18 AMSU-A
    NE∆T
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    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.