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The need for experimental data in support of IPWG research activities

This article discusses the need for experimental data in support of IPWG research activities, including requirements from IPWG and CGMS, the GEM/GOMAS project, and a planned airborne campaign over Europe. It also highlights the bands, channels, and objectives of GOMAS, GEM, EGPG, and CIWSIR.

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The need for experimental data in support of IPWG research activities

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  1. The need for experimental data • in support of IPWG research activities • Bizzarro Bizzarri, CNR/ISAC, Roma, Italy • Albin Gasiewski, NOAA/ETL, Boulder Co., USA • Contents: • Requirements from IPWG and CGMS for experimental data • Shortest reminding of the GEM/GOMAS project • The planned MW/Sub-mm airborne campaign over Europe 2nd IPWG Workshop, Monterey 25-28 October 2004

  2. IPWG requirements for experimental data At the 1st IPWG Workshop in Madrid (23-27 September 2002), the “Research Activities WG”, under the item “Future Sensors”, identified the need for experimental datasets in support of - the definition of future missions and - to feed the scientific simulation programmes. B. Bizzarri was charged to pursue the matter (Recommendation 1). Soon after, B. Bizzarri and A. Gasiewski started planning for the airborne campaign now being described. 2nd IPWG Workshop, Monterey 25-28 October 2004

  3. CGMS recommendation The IPWG requirement was brought to the attention of the successive sessions of CGMS that finally, at its XXXII session (Sochi, Russia, 17-20 May 2004), approved the following: Action 32.16 - CGMS recommends that Space Agencies support, as much as possible, the IPWG request for procuring experimental data sets (e.g. by airborne campaigns) to help cloud/precipitation modelling and instrument definition. A report on the support realised for this IPWG request should be given at CGMS XXXIII. Deadline: CGMS XXXIII. 2nd IPWG Workshop, Monterey 25-28 October 2004

  4. NORTH DIRECTION Solar Wing Space Calibration Tube S-band Antenna for TT&C 3 -meter Antenna NADIR S-Band Antenna for TT&C Star Sensors S-band antenna for LRIT The GOMAS satellite • Mass: 860 kg (“dry": 430 kg) • Electrical power: 500 W • Volume: 3.0 x 3.0 x 3.0 m3 • Data rate: 128 kbps (S-band, compatible with MSG LRIT). 2nd IPWG Workshop, Monterey 25-28 October 2004

  5. GOMAS (Geostationary Observatory for MW Atmospheric Sounding) • European sector (1/12 of disk) scanned each 15 minutes. • Simultaneous retrieval of • temperature profile, all weather and in clouds, 30 km resolution • humidity profiles, all weather and in clouds, 20 km resolution • cloud liquid/ice water total column and gross profile, 20 km resolution • precipitation, 10 km resolution. 2nd IPWG Workshop, Monterey 25-28 October 2004

  6. Atmospheric spectrum in the MW/Sub-mm range (Klein and Gasiewski, 2000). Preferred bands - for O2 (temperature): 54 GHz, 118 GHz, 425 GHz; for H2O: 183 GHz, 380 GHz. 2nd IPWG Workshop, Monterey 25-28 October 2004

  7. Incremental Weighting Functions (IWF) for the selected channels in the bands of oxygen (54, 118 and 425 GHz) and of water vapour (183 and 380 GHz). Note that the sensitivity of 380 and 425 GHz drastically drops in lower troposphere (Klein and Gasiewski, 2000). 2nd IPWG Workshop, Monterey 25-28 October 2004

  8. Comparison between the 118/54 GHz profile ratio from the NAST-M microwave radiometer being flown on the NASA ER-2 aircraft and simultaneous EDOP Doppler radar reflectivity observation. Hurricane Bonnie at 17 GMT on August 26, 1998(Tsou et al, 2001). The ratio 118/54 is unit in the absence of precipitation or above the precipitation cell, and reduces in the presence of precipitation because of higher attenuation from drops and impact from ice scattering at the higher frequency. The agreement between the two vertical cross-sections is striking. Horizontal maps of this information from GEO at 15 min intervals, will resemble a proxy rain radar operating over continental field of view, particularly over oceans and mountainous terrain. 2nd IPWG Workshop, Monterey 25-28 October 2004

  9. Planning for an airborne campaign • Objectives of a MW/Sub-mm airborne campaign in Europe are: • To characterise the signature of clouds and precipitation in the MW and Sub-mm bands selected for GOMAS and GEM in respect of frontal rain, light rain and snowfall, in addition to convective rain considered to be enough characterised. • To compare experimental precipitation observation by MW/Sub-mm sounding with conventional data observed by MW windows. This will, i.a., allow demonstrating the benefit of adding absorption channels to the baseline window channels of EGPM (European contribution to GPM). • To contextually demonstrate the applicability of MW/Sub-mm to the study of cloud ice and water vapour in the Upper Troposphere / Lower Stratosphere (project CIWSIR, Cloud Ice and Water-vapour Sub-mm Imaging Radiometer). 2nd IPWG Workshop, Monterey 25-28 October 2004

  10. Bands and channels of GOMAS and GEM 2nd IPWG Workshop, Monterey 25-28 October 2004

  11. Bands and channels of EGPG (green boxes baseline, others optional) 2nd IPWG Workshop, Monterey 25-28 October 2004

  12. Bands and channels of CIWSIR for cloud ice and water vapour in UT/LS 2nd IPWG Workshop, Monterey 25-28 October 2004

  13. Scanheads of the NOAA/ETL Polarimetric Scanning Radiometer (PSR) 2nd IPWG Workshop, Monterey 25-28 October 2004

  14. The “M-55 Geophysica” aircraft 2nd IPWG Workshop, Monterey 25-28 October 2004

  15. The “M-55 Geophysica” aircraft 2nd IPWG Workshop, Monterey 25-28 October 2004

  16. The “M-55 Geophysica” aircraft 2nd IPWG Workshop, Monterey 25-28 October 2004

  17. Volumetric aspect of PSR (about 1 m3, about 430 kg) 2nd IPWG Workshop, Monterey 25-28 October 2004

  18. Bay I: volume 2,052 m3, mass 360 kg - Bay II: volume 1,963 m3, mass 430 kg - Bay III: volume 1,135 m3, mass 100 kg 2nd IPWG Workshop, Monterey 25-28 October 2004

  19. Status of planning - Conclusion A pre-feasibility study has been carried out informally by Russians and NOAA/ETL (Al Gasiewski) with the assistance of CNR/ISAC staff. NOAA/ETL has implemented the necessary modifications to the instrument to fit the M-55 Geophysica bay II. Interest to support the campaign has been generically expressed at instances by the Italian Space Agency (ASI), ESA, NASA, EUMETSAT and NOAA. Costs have been estimated as 900 k Euro for 60 flight hours across Europe. The nominal plan aims at a first campaign in mid-October to mid-December 2005 and a second one in Spring 2006. The purpose of presenting the plan to IPWG is to establish resonance with the CGMS Action within Space Agencies aimed at providing support to the IPWG activities. As mentioned, CGMS expects a report on the implementation of this Action at its next session (Tokyo, second half of 2005). 2nd IPWG Workshop, Monterey 25-28 October 2004

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