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Water Vapour Intercomparison Effort In The Frame Of The Convective And Orographically-Induced Precipitation Study

Bhawar, R. and Di Girolamo, P. and Summa, D. and Flamant, C. and Althausen, D. and Behrendt, A. and Blyth, A. and Bock, O. and Bosser, P. and Cacciani, M. and Crewell, S. and Champollion, C. and Davies, F. and Di Iorio, T. and Ehret, G. and Engelmann, R. and Kiemle, Christoph and Mattis, I. and Herlold, C. and Mobbs, S. and Mueller, D. and Pal, S. and Radlach, M. and Riede, A. and Seifert, P. and Shiler, M. and Smith, V. and Wirth, M. and Wulfmeyer, V. (2009) Water Vapour Intercomparison Effort In The Frame Of The Convective And Orographically-Induced Precipitation Study. ISTP 2009, 19.-23. Okt. 2009, Delft, Netherlands.

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Abstract

An intensive water vapour intercomparison effort, involving airborne and groundbased water vapour lidar systems, radiosondes with different humidity sensors, GPS and microwave radiometers (MWR), was performed in the frame of COPS (01 June - 31 August 2007). The main objective of this work is to provide accurate error estimates for the different water vapour profiling sensors. Simultaneous and colocated data from different sensors are used to compute relative bias and root-mean square (rms) deviations as a function of altitude. Comparisons between airborne CNRS DIAL and ground-based Raman lidar BASIL (25 in total) indicate a mean relative bias between the two sensors of 2.1 % (0.12 g/kg) in the altitude region 0– 3.5 km a.g.l. Based on the 3 comparisons between BASIL vs airborne DLR DIAL, the mean relative bias is -3.5 % (-0.24g/Kg) in the altitude region 0–3 Km. On the present statistics of comparisons between BASIL vs both airborne DIALs and GPS and putting equal weight on the data reliability of each instrument, it results in the bias values of: BASIL Raman Lidar 0.3 %, DLR DIAL -3.2 %, CNRS DIAL 2.4 % and GPS 2.0 %. An inter-comparison between radiosondes indicates that RS80-A and RS80-H are affected by several systematic sources of errors. After correction for these error sources, mean bias between RS80 (A&H) and RS92 is found to be reduced to -4.5 %. Comparisons (5 in total) between the two airborne DIAL’s (CNRS DIAL and DLR DIAL) over the COPS region result in mean relative bias of 6.0 % (0.53 g/Kg) in the altitude 0-3 Km. The ongoing comparisons between BASIL vs GPS, MWR and radiosondes and between the water vapor lidars located at different sites especially benefiting from the extraordinary performances of the ground-based UHOH DIAL system, will be discussed at the conference.

Document Type:Conference or Workshop Item (Speech)
Title:Water Vapour Intercomparison Effort In The Frame Of The Convective And Orographically-Induced Precipitation Study
Authors:
AuthorsInstitution or Email of Authors
Bhawar, R.Univ. of Basilicata
Di Girolamo, P.Univ. of Basilicata
Summa, D.Univ. of Basilicata
Flamant, C.Service d'Aéronomie
Althausen, D.Leibniz Institute for Tropospheric Research
Behrendt, A.Univ. Hohenheim
Blyth, A.School of Earth and Environment
Bock, O.LOEMI
Bosser, P.LOEMI
Cacciani, M.Univ. degli Studi di Roma “La Sapienza”
Crewell, S.Univ. zu Koeln
Champollion, C. Service d'Aéronomie
Davies, F.Research Inst. for Built and Human Environment
Di Iorio, T.Univ. degli Studi di Roma “La Sapienza”
Ehret, G.DLR
Engelmann, R.Leibniz Institute for Tropospheric Research
Kiemle, ChristophDLR
Mattis, I.Leibniz Institute for Tropospheric Research
Herlold, C.Leibniz Institute for Tropospheric Research
Mobbs, S.School of Earth and Environment
Mueller, D.Leibniz Institute for Tropospheric Research
Pal, S.Univ. Hohenheim
Radlach, M.Univ. Hohenheim
Riede, A.Univ. Hohenheim
Seifert, P.Leibniz Institute for Tropospheric Research
Shiler, M.Univ. Hohenheim
Smith, V.School of Earth and Environment
Wirth, M.DLR
Wulfmeyer, V.Univ. Hohenheim
Date:2009
Status:Published
Keywords:Lidar Water Vapour COPS DIAL
Event Title:ISTP 2009
Event Location:Delft, Netherlands
Event Type:international Conference
Event Dates:19.-23. Okt. 2009
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Stephanie Zähnle
Deposited On:26 Jan 2010 14:17
Last Modified:26 Jan 2010 14:17

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