Understanding Dropsonde Pressure Measurements and Corrections
Explore the challenges and solutions related to dropsonde pressure measurements, including systematic offsets and correction methods. Learn about recent recommendations and updates for improving pressure readings during data collection.
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Presentation Transcript
NCAR | EOL Discussion: Dropsonde pressure measurements Holger V mel 20th AVAPS Users Group Meeting 25 April 2018 NCAR | Pressure update
Issue The dropsonde pressure sensor has a small systematic offset, which should be corrected before a sounding: Current status: NOAA/AOC: In-aircraft pressure reference sensor NCAR campaigns: post-processing based on reference comparison during production Air Force and others: No correction Future status with RD41 Pressure correction built into firmware NCAR | 2 Pressure update
Constant pressure is a good approach Laboratory offset measurement Max Standard Deviation Mean Median Min NCAR | 3 Pressure update
Last years recommendation Recommend application of production pressure correction in AVAPS Recommend removing dynamic pressure correction Recommend adjusting extrapolation time in Aspen (see Dean s talk) Surface pressure readings to within <0.4 hPa can be demonstrated! NCAR | 4 Pressure update
Production problem Now fixed NCAR | 5 Pressure update
Last years recommendation Recommend application of production pressure correction in AVAPS Recommend removing dynamic pressure correction Recommend adjusting extrapolation time in Aspen (see Dean s talk) Surface pressure readings to within <0.4 hPa can be demonstrated! NCAR | 6 Pressure update
Last years recommendation Recommend application of production pressure correction in AVAPS Recommend removing dynamic pressure correction ? Recommend adjusting extrapolation time in Aspen (see Dean s talk) Surface pressure readings to within <0.4 hPa can be demonstrated! NCAR | 7 Pressure update
Last years recommendation Recommend application of production pressure correction in AVAPS Recommend removing dynamic pressure correction ? Recommend adjusting extrapolation time in Aspen (see Dean s talk) 0.5 hPa Surface pressure readings to within <0.4 hPa can be demonstrated! NCAR | 8 Pressure update
Updated recommendations RD94: NOAA continue with in-aircraft pressure reference Air Force update AVAPS to allow range checked production based pressure offset correction Air Force install reference pressure sensors in their AVAPS systems to monitor long term stability (longer term project) RD41: Pressure offset correction built into firm-ware. NOAA and Air Force monitor long term stability Surface pressure extrapolation: Need more buoy comparisons to evaluate extrapolation time Change may need to be implemented. NCAR | 9 Pressure update
