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Integrated Profiling at the AMF Kerstin Ebell 1, Ulrich Löhnert 1, Susanne Crewell 1, Dave Turner 2 1 Institute for Geophysics and Meteorology, University.

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Presentation on theme: "Integrated Profiling at the AMF Kerstin Ebell 1, Ulrich Löhnert 1, Susanne Crewell 1, Dave Turner 2 1 Institute for Geophysics and Meteorology, University."— Presentation transcript:

1 Integrated Profiling at the AMF Kerstin Ebell 1, Ulrich Löhnert 1, Susanne Crewell 1, Dave Turner 2 1 Institute for Geophysics and Meteorology, University of Cologne 2 SSEC, University of Madison – Madison, WI 6th COPS Workshop, University of Hohenheim27 – 29 February 2008

2 2 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 temporally highly resolved Motivation Only possible through integration of multiple measurement principles Accurate information on the atmospheric state desireable for numerous applications evaluation of NWP models, i.e. assessment of radiation schemes development of parametrization schemes validation of satellite products data assimilation … continuously and automatically

3 3 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 HATPRO DPR 90/150 Cloud radar Radiometer Radiosondes Integrated Profiling Technique (IPT) – Overview 1 Integration = physically consistent combination of all employed measurement information Need knowledge on: inversion methods instrument characteristics (theory, error) forward model, i.e. radiative transfer Background information

4 4 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 provides continuous vertical profiles of temperature, humidity and liquid water content (LWC) needs information of different active and passive remote sensing instruments Integrated Profiling Technique (IPT) – Overview 2 Application to measurements of ARM Mobile Facility + measurements of multi-spectral radiometers in the Black Forest (Supersite M) from April 1 to December 31, 2007

5 5 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 Integrated Profiling Technique (IPT) – Overview 3 Microwave radiometers Cloud radar A priori information (here radiosondes) CloudNet Target Categorization: Each pixel is categorized in terms of the presence of liquid droplets, ice, insects or aerosol. Discrimination between precipitating and non-precipitating clouds. Integration of measurements in the framework of optimal estimation x=(T,q,log 10 (LWC)) y=(TB,Z) x a : a priori profiles of T, q, log 10 (LWC) S a : a priori covariance matrix S e : combined measurement and forward model error covariance matrix

6 6 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 CloudNet Target Classification Example: 7 July 2007

7 7 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 absolute humidity (g/m 3 ) temperature (K) 0-6:50 UTC: dew on radome retrieved profiles: temperature and humidity Example: 7 July 2007

8 8 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 retrieved profiles: liquid water content radar reflectivity (dBZ) liquid water content (g/m 3 ) liquid water path (g/m 2 ) Example: 7 July 2007

9 9 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 LWC error (gm -3 )T error (K)q error (gm -3 ) Height above surface (km) estimate of mean error LWP (g/m 2 ) IWV (kg/m 2 ) stat. retrieval HATPRO GPS Example: 7 July 2007 Time in decimal hours on

10 10 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 New: Inclusion of multispectral IR measurements Atmospheric Emitted Radiance Interferometer (AERI) Objectives: Enhancement of accuracy & vertical resolution for temperature and humidity profile retrieval in clear-sky cases (and below cloud) Future: develop a powerful, complementary retrieval tool (AERI+MW+cloud radar) more accurate retrieval of cloud properties over a wider range of LWP (from very low to precipitating), inclusion of ice microphysics

11 11 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 Humidity retrieval shows potential of combining MW and AERI measurements only MWMW+AERI Application to COPS measurements (May 25, 2007 – AMF)

12 12 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 Application to COPS measurements (May 4, 2007 – AMF) Retrieval of ice microphysics from AERI (and MW)

13 13 6th COPS Workshop, University of Hohenheim, 27 – 29 February 2008 Derivation of physically consistent profiles of temperature, humidity and cloud liquid water within an optimal estimation framework (Integrated Profiling Technique) Inclusion of target information in the retrieval (CloudNet target categorization) Combination of MW and AERI shows potential for high-quality humidity retrieval Application of IPT to whole AMF dataset (April-Dec. 2007) Be careful: problems when clouds are not detected Attempt to derive cloud droplet concentration Use IPT output for SW/LW radiative transfer applications, cloud fraction contained in MW-volume scans ( see poster S. Kneifel) Combine MW & AERI in cloudy cases (liquid, ice & mixed-phase) Summary Outlook


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