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

    •  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
    • 7/29/2011
      IEE IGARSS 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)
    • 7/29/2011
      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
    • Local Equatorial Crossing Times (LECT) & Operational Statuses of the NOAA and METOP Satellites
      7/29/2011
      IEE IGARSS 2011
      4
    • NOAA-19 On-orbit Verification of NE∆T:AMSU-A (Ch.1-15) and MHS (Ch.16-20)
      7/29/2011
      IEE IGARSS 2011
      5
    • 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
      7/29/2011
      IEE IGARSS 2011
      6
    • NOAA-18 MHS NE∆T & Ch.Gain
      7/29/2011
      IEE IGARSS 2011
      7
      NE∆T (K)
    • NOAA-19 MHS NE∆T & Ch.Gain
      7/29/2011
      IEE IGARSS 2011
      8
      NE∆T (K)
    • NOAA-18 MHS Ch. 1
      NE∆T:
      ● Ten days
      ● Thirty days
      ● One Year
      ● Life time since launch
      7/29/2011
      IEE IGARSS 2011
      9
    • ● 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.
      7/29/2011
      IEE IGARSS 2011
      10
      NOAA-18 and NOAA -19 MHS BT Over ANTARCTICA
    • (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
      7/29/2011
      IEE IGARSS 2011
      11
    • Ascending Local Equator Crossing Time (LECT)
      7/29/2011
      IEE IGARSS 2011
      12

    • 7/29/2011
      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.
    • 7/29/2011
      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
    • 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
      7/29/2011
      IEE IGARSS 2011
      15
    • 7/29/2011
      IEE IGARSS 2011
      16
      Thank You
    • Climate Trends from NOAA-15 AMSU-A Measurements
      7/29/2011
      IEE IGARSS 2011
      17
      ●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
    • NOAA-18 AMSU-A
      NE∆T
      7/29/2011
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      18
    • 7/29/2011
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      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.