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IMGI's Contribution to COPS 2007 Field Experiment

This workshop paper presents the Institute of Meteorology and Geophysics' (IMGI) contribution to the COPS 2007 field experiment, including the description of the IMGI station network, data preparation and availability, GOP overview, case study of July 4th, 2007, and conclusion.

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IMGI's Contribution to COPS 2007 Field Experiment

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  1. COPS Workshop 2008 University of Hohenheim, Stuttgart; 27 to 29 February 2008 IMGI‘s contribution to the COPS 2007 field experiment Simon Hölzl & Alexander Gohm Institute of Meteorology and Geophysics (IMGI) Innsbruck, Austria

  2. Introduction Introduction • Description of IMGI station network • State of data preparation • Data availability • GOP overview • Case study: 4 July 2007 • Conclusion

  3. Description of IMGI station network - Overview Description of IMGI station network • 10 Automatic weather stations (MOMAA) • 6 Tipping bucket rain gauges (DAVIS) • 2 Laser disdrometers (THIES) • 1 Weighing rain gauge (OTT PLUVIO) Enz Valley Murg Valley Hornisgrinde

  4. Description of IMGI station network - Measured parameters Measured parameters • MOMAA AWS • time resolution: 1 min • Air temperature • Soil temperature • Relative humidity • Wind speed and wind direction • Net radiation • Pressure • precipitation rate (0.1 mm resolution) • DAVIS tipping bucket rain gauge • time resolution: 10 min • precipitation rate (0.2 mm resolution)

  5. Description of IMGI station network - Measured parameters Measured parameters • OTT PLUVIO weighing rain gauge • time resolution: 1 min • accumulated precipitation • precipitation rate • THIES laser disdrometer • time resolution: 1 min • precipitation rate [mm/h] • accumulated precipitation • SYNOP/METAR encoding • visibility • radar reflectivity • preciptitation particle size distribution

  6. Data preparation Data preparation • Formatting of raw data • Creating data sets of equal length and format • Filling up gaps • Quality control • checking data foroutliers and biases • flagging of missingor questionabledata • Calibration – Bias removal bad data

  7. Data availability Data availability MOMAA: 93 % DAVIS: 78 % THIES: 79 % OTT: 76 %

  8. GOP overview – Daily accumulated precipitation Daily accumulated precipitation sensor failure moist period

  9. GOP overview – Accumulated precipitation for whole SOP Accumulated precipitation for whole SOP Enz Valley Murg Valley ~ 69 % more precipitation Hornisgrinde THIES MOMAA MOMAA THIES OTT

  10. Case study – 4 July 2007 Case study – 4 July 2007 ~ 108 % more precipitation Enz Valley Murg Valley THIES MOMAA THIES MOMAA OTT convective events Hornisgrinde

  11. Conclusion Conclusion • IMGI deployed 10 AWS equipped with tipping bucket rain gauges, 6 tipping bucket rain gauges, 2 laser disdrometers and 1 weighing rain gauge during the COPS 2007 field experiment • The data set is nearly continuous (> 90 % for MOMAA precipitation data) and has a high spatial and temporal resolution (~ 5 x 5 km, 1 – 10 min) • Possible applications of the IMGI data set: • Instrument intercomparison study • Validation of radar-derived rain rates • Investigation of small scale precipitation variability • Verification of numerical models

  12. Thank you for your attention!

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