IHOP Radiosonde and Dropsonde Data Highlights and Problems Junhong (June) Junhong (June) Wang Wang Kate Beierle Kate Beierle NCAR/ATD NCAR/ATD 1. Radiosonde data • Summary • Humidity sensors • Problems 2. Dropsonde data • Summary • Scientific Highlights • Problems
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IHOP Radiosonde and Dropsonde Data: Highlights and Problems
IHOP Radiosonde and Dropsonde Data: Highlights and Problems. Radiosonde data Summary Humidity sensors Problems Dropsonde data Summary Scientific Highlights Problems. Junhong (June) Wang Kate Beierle NCAR/ATD. Summary of all radiosonde data from IHOP. Reference sonde. - PowerPoint PPT Presentation
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IHOP Radiosonde and Dropsonde Data: Highlights and Problems
Junhong (June) Wang Junhong (June) Wang Kate BeierleKate BeierleNCAR/ATDNCAR/ATD
3. Histograms of PTU and wind3. Histograms of PTU and wind
4. Time series of PTU and wind4. Time series of PTU and wind
5. Comparisons with other data
Data quality control for ATD Dropsonde DataData quality control for ATD Dropsonde Data
Geopotential height problems and solutionsGeopotential height problems and solutions
Before
After
2. Corrections:
Good soundings
Integrate from surface up
Surface elevation
Soundings with missing data above surface
Integrate from FL down
Add PTU to FL
Corrected heights
Integrate from flight-level down
Unknown surface altitude
1. No flight-level PTU data2. Use flight-level height but 1st available pressure (~20s)
~200-300 m overestimate of heights
1. Problems:
Geo-potential height data after correctionsGeo-potential height data after corrections
Missing data before landing
Importance Notes Importance Notes for IHOP radiosonde/dropsonde datafor IHOP radiosonde/dropsonde data
• Do not use reference sonde pressure and wind data:
1. The reference sonde (RS) uses a hypsometer to measure pressure. Unfortunately the hypsometer was not stable and has all kinds of problems.
2. We didn't correct balloon swing at all for winds and had quite big balloon swing because of bigger balloons used.
• Sensor arm heating error in radiosonde data at Homestead:
1. The SAH error depends on a lot of factors
2. Different impacts for T and RH: 40-60 s (200-300m) for RH, negligible for T.
• Take precautious about dropsonde geopotential data:
The Geopotential height problems in IHOP dropsonde data are investigated and corrected. But there may be some un-identified problems in some individual soudnings.
Errors/Biases and Error variances in radiosonde and dropsonde data will show latter