AR Atmospheric Technology Division Intercomparisons of Radiosonde Humidity Data and Cirrus Cloud Observations during IHOP_2002 Junhong (June) Wang NCAR Atmospheric Technology Division Collaborators: Dave Carlson, Dave Parsons, Terry Hock, Dean Lauritsen, Hal Cole, Kate Beierle, and Ned Chamberlain (NCAR/ATD), Dan Zhou (NASA) NCAR Water Cycle Initiative Support
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Intercomparisons of Radiosonde Humidity Data and Cirrus Cloud Observations during IHOP_2002
Intercomparisons of Radiosonde Humidity Data and Cirrus Cloud Observations during IHOP_2002. Junhong (June) Wang NCAR Atmospheric Technology Division. Collaborators: Dave Carlson, Dave Parsons, Terry Hock, Dean Lauritsen, Hal Cole, Kate Beierle, and Ned Chamberlain (NCAR/ATD), Dan Zhou (NASA). - PowerPoint PPT Presentation
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NCAR Atmospheric Technology Division
Intercomparisons of Radiosonde Humidity Data and Cirrus Cloud Observations during IHOP_2002
• Vaisala RS80-H with the new sensor boom cover agrees with the SW very well in the middle and lower troposphere, but has dry biases in the upper troposphere (UT).
• Systematic and significant differences between RS80-H and RS90 humidity data are found, and will be investigated in detail.
• VIZ carbon hygristor has time-lag errors throughout the troposphere and fails to respond to humidity changes in the UT, sometimes even in the middle troposphere.
• The SW can detect cirrus clouds near the tropopause and possibly estimate their ice water content (IWC).
• SW-estimated cirrus cloud properties will be compared quantitatively with remote sensing data. (“IHOP cirrus cloud comparisons” meeting at 12-1 pm on Tuesday at Room 1003)
NCAR Atmospheric Technology Division
Important Notes about IHOP Reference Radiosonde and 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.
• Do not use dropsonde geo-potential altitude data:
1. There are uncertainties in the flight level heights which are used as a reference by ASPEN to integrate geopotential altitudes.
2. There are no flight level PTU data for any of the Lear jet soundings because there were no PTU sensors on board, and for some of the Falcon soundings there is no flight level PTU data because while there were PTU sensors, the data was manually entered and therefore its accuracy is unknown.