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Unprecedented upper-air observations over Antarctica from Concordiasi driftsonde data

Unprecedented upper-air observations over Antarctica from Concordiasi driftsonde data. Junhong (June) Wang Terry Hock, Stephen A. Cohn, Dean Lauritsen , Charlie Martin, Nick Potts NCAR/EOL Tony Reale , NOAA/NESDIS Bomin Sun, Michael Pettey , Frank Tilley and Charles Brown

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Unprecedented upper-air observations over Antarctica from Concordiasi driftsonde data

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  1. Unprecedented upper-air observations over Antarctica from Concordiasidriftsonde data Junhong (June) Wang Terry Hock, Stephen A. Cohn, Dean Lauritsen, Charlie Martin, Nick Potts NCAR/EOL Tony Reale, NOAA/NESDIS Bomin Sun, Michael Pettey, Frank Tilley and Charles Brown I.M. Systems Group, Inc

  2. Concordiasi(Antarctica, Sept.-Nov. 2010) To validate and improve the assimilation of AIRS/IASI in numericalmodels Total 13 flights (43-94 days) Total 647 soundings

  3. DRIFTSONDE Concept Zero Pressure Balloon (363 m3) Iridium LEO Satellite Communications Gondola 20-50 Sonde Capacity Flight Altitude 125mb to 50mb (~65,000’) Sondes Dropped by Time or Command DropsondePTH &Wind Command & Control Ground Station North America 57th Interdepartmental Hurricane Conference Atlantic Ocean Europe

  4. MSD11: 10/19-12/29/2010 Transit High Plateau Coast Coast

  5. Composites of winds

  6. NOAA PROductsValidation System (NPROVS) Centralized Radiosonde and Satellite Collocation Processing GRAVITE / IPO NPP EDR PROXY (dropsonde) 6-hour 250km (UCAR) (12,13 …R) Collocated Sonde/NWP and multipleSatellite products dataset April 2008 … S i n g l e C l o s e s t http://www.star.nesdis.noaa.gov/smcd/opdb/poes/NPROVS.php

  7. Dropsonde and Radiosonde Profiles (Sept. 22, 2010 – Dec. 10, 2010) GFS_Forecast 535/1177 NOAA_IASI 278/737 Aqua_AIRS399/983

  8. Temperature GFS_Forecast NOAA_IASI Aqua_AIRS • Consistent cold biases in satellite data (larger for AIRS) • Better agreement between GFS and RAOB • Warm bias in LT for IASI • Larger cold biases relative to driftsonde than radiosonde

  9. Relative Humidity GFS_Forecast NOAA_IASI Aqua_AIRS • Consistent dry (moist) biases in LT (MT/UT) for satellite data • Bias and S.D. are comparable. • Dry bias in dropsondein UT. • Better agreement between GFS and RAOB at < 400 hPa

  10. Reproducibility of Temperature at 500 hPa GFS_FC vs Drift Auqa_AIRSvs Drift T_500 (IASI – Drift) NOAA_IASI vs RAOB NOAA_IASI vs Drift

  11. Reproducibility of RH at 500 hPa GFS_FC vs Drift NOAA_IASI vs Drift Auqa_AIRSvs Drift NOAA_IASI vs RAOB

  12. Reproducibility

  13. Summary Concordiasidriftsonde data provides unprecedented high-quality, high-vertical-resolution upper-air observations over Antarctica and surrounding Ocean. NPROVS is shown to be a useful tool to collect and compare co-located dropsonde/radiosonde and multiple satellite profiles. Preliminary results show colder but moister profiles in models and satellite data than both dropsonde and radiosonde. The biases are larger relative to dropsonde than radiosonde. There are much better agreements for temperature than humidity.

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