WP2 Radar Calibration Workshop - Cologne September 2015

Date September 28-29, 2015
Meeting venue

The Cloud Radar Calibration Workshop will take place at the University of Cologne, Pohligstr. 3, Cologne, Germany (Lecture hall 4001, 4th floor).

The workshop is part of the European ACTRIS-2 (Aerosols, Clouds, and Trace gases Research InfraStructure) project, partners and associated partners are welcome to attend.


Please send an email if you consider attending the workshop to:

  • Stefan Kneifel: skneifel@meteo.uni-koeln, or
  • Herman Russchenberg:
Workshop scope

The main goal of the workshop is to initiate and coordinate cloud radar calibration activities across Europe to ensure high quality and intercomparability of the datasets collected.

The workshop is intended to provide an overview of ongoing and planned calibration activities of the different groups, discuss the different aspects and challenges of cloud radar calibration methods, and formulate short-term and long-term calibration goals.

The workshop is also aimed to develop strategies how the calibration activities can be best coordinated and embedded in ACTRIS and how exchange between other networks like ARM or the radar manufacturers can be realized on a regular basis.

The overall workshop structure includes plenty of room for discussions and is supposed to allow all participants to contribute short presentations about their recent or planned activities and results regarding cloud radar calibration. Potential contribution to the different topics are most welcome.

Preliminary workshop programme:

Monday, 28th September
08:45 – 09:00 Welcome and Logistics
09:00 – 10:00 Motivation and Overview
09:00 – 09:30 EU activities, ACTRIS (20min talk + 10min disc., H. Russchenberg)
09:30 – 10:00 Implications of calibration for a cloud radar network (20min talk + 10min disc., E. O’Connor)
10:00 – 10:30 Ongoing and planned activities/interests of WS participants (Discussion)
10:30 – 10:45 Coffee break
10:45 – 11:15 How to define and use a reflectivity standard
  Reflectivity standards (calibr. targets, cross section), radar point target vs. volume target equation including definition of parameters (volume, range weighting function, etc.)
(H. Russchenberg, 20min talk + 10min discussion)
11:15 – 12:30 Reflectivity calibration – practical examples
11:15 – 11:30 Tethered balloon scanning MIRA calibration (E. Orlandi)
11:30 – 11:45 Absolute calibration of BASTA 95 GHz radar with mast target (G. Clain/J. Delanoe)
11:45 – 12:00 Reflectivity closure experiment using profiles from OPC (JC. Dupont)
12:00 – 12:15 Noise-based calibration of S-band radar and intercomparison with the X-band system (C. Unal)
12:15 – 12:40 Discussion: Uncertainties, comparability, and feasibility of reflectivity calibration methods
12:40 – 13:30 Lunch break
13:30 – 14:15 ARM calibration strategy – (30min talk + 15min disc., P. Kollias via Skype)
14:15 – 15:15 Polarimetry, Antenna and Pointing calibration
14:15 – 14:30 Antenna pattern, LDR and polarimetric calibration for MIRA-STSR (A. Myagkov)
14:30 – 14:45 Radar pointing calibration (S. Kneifel)
14:45 – 15:00 ZDR calibration (E. O’connor)
15:00 – 15:15 Discussion: Uncertainties and comparability of polarimetric and pointing calibration methods
15:15 – 15:30 Coffee break
15:30 – 17:00 Long-term calibration techniques
15:30 – 15:45 Internal MIRA calibrations (G. Peters)
15:45 – 16:00 Internal RPG95-FMCW calibrations (T. Rose)
16:00 – 16:15 Long-term cloud radar calibration monitoring at DWD (U. Görsdorf)
16:15 – 17:00 Discussion: How sufficient are internal calibrations? How often do we need external calibr.? What is the most reliable method to monitor calibration quality?
Ca. 18:30 Dinner in Cologne
Tuesday, 29th September
09:00 – 09:30 Summary of Day 1 and Introduction/Discussion of working group topics
09:30 – 10:45 How to coordinate calibration activities?
09:30 – 09:45 Possibilities within ACTRIS, calibration centers, COST actions, ESFRI (H. Russchenberg)
09:45 – 10:00 How are calibration activities coordinated for MWRs? (U. Löhnert)
10:00 – 10:15 Planned activities in Palaiseau
10:15 – 10:45 Discussion: Coordination within Europe, exchange with ARM, role of radar manufacturers, which super-sites could become calibration centers
10:45 – 11:00 Coffee Break
11:00 – 12:15 WG 1: Develop recommendation for minimum calibration requirements for scanning and zenith pointing radars, which activities should be planed first (within the next 12 months)? Define long-term calibration goals including minimum calibration quality requirements (e.g. Ze accuracy).
12:15 – 13:15 Lunch Break
13:15 – 14:30 WG 2: Can we come up with standardized calibration techniques and provide a calibration guide? How can such a guide be developed? What should be included? Including a guide to estimate calibration bias and uncertainty? Who leads it and who can contributes which part?
14:30 – 14:45 Coffee Break
14:45 – 15:45 WG 3: How to make different radars (locations, frequencies) intercomparable? Which plans already exist for calibration campaigns and how to inform everybody? Should MRRs or transportable cloud radars be considered as second calibration standard? CloudSat overpass statistics?
15:45 – 16:15 Workshop Recap: Feedback, How to improve design/structure of future WS. What was good or not so good? Missing discussion topics and ideas? When/Where shall we continue with these workshops?

A list of suggested hotels with special rates for the University of Cologne can be downloaded (PDF).
You will furthermore be required to complete and provide a special form for the accommodation facility (PDF).

 Access  For access to the meeting venue, please download the PDF.