EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING Arkady Koldaev, Evgeny Miller, Arkady Troitsky, Sergey.

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EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING Arkady Koldaev*, Evgeny Miller**, Arkady Troitsky***, Sergey Sarichev* *Scientific Production Association “Typhoon”, Russia ** Central Aerological Observatory, Russia *** Scientific Research Radiophysics Institute, Russia WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING List of Contents 1. Introduction 2. Experimental compaine 2.1 Set of instruments 2.2 Locations 2.3 Data occuisition 3. Results 3.1 Row results 3.2 Statistical results 3.3 Physical results 4. Conclusions

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING 1. Introduction Effects of Rain a) Water on radiometer b) Rain in the beam c) Shower at a distance d) Drops after rain

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING 2.Experimental compaine 2.1 Set of instruments The experiment was carried out on the base of Obninsk World Meteorological Centre. And as a special, we have used their 300m meteorological tower. For remote temperature profiling we have used microwave temperature profiler MTP-5HE (“ATTEX”, Russia). The remote sensing instrument has been installed at about 700m East from the meteorological tower. The information about rain precipitation along the path between remote sensing instrument site and the tower were provided by 3 micro-radar rain sensors DROP (“Aqua Nubis”, Russia ).

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING 2.Experimental compaine 2.2 Locations

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING 2. Experimental compaine 2.3 Data occuisition

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING 3. Results 3.1 Row results

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING 3. Results 3.2 Statistical results All the data after quality control has been calculated as hour-average profiles and interpolated in same heights for comparison procedures

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING 3. Results 3.3 Physical results

WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010 EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING 4. Conclusions On figure are shown the example of time series with the rain (intensity less than 0.12 mm/min or 7.2 mm/h during about one hour) when there is no influences in comparison of the tower and profiler data. It mean that the rain condition isn’t enough to destroy the microwave remote measurement, but of course, it should to get some limitation on accuracy of remote sensing. By any way, the effect of the rain condition can not be longer than the period of the rain.

Thank you! EXPERIMENTAL STUDY OF RAIN-INDUCED ACCURACY LIMITS FOR MICROWAVE REMOTE TEMPERATURE PROFILING Arkady Koldaev*, Evgeny Miller**, Arkady Troitsky***, Sergey Sarichev* *Scientific Production Association “Typhoon”, Russia ** Central Aerological Observatory, Russia *** Scientific Research Radiophysics Institute, Russia WMO TECHNICAL CONFERENCE ON METEOROLOGICAL AND ENVIRONMENTAL INSTRUMENTS AND METHODS OF OBSERVATION TECO-2010 Helsinki, Finland, 30 August – 1 September 2010