Event Title
Development of new HYdorometer VIdeo Sonde (HYVIS) system for ice cloud observation in TTL region
Location
East-West Center, University of Hawai'i at Manoa (Honolulu, Hawai'i)
Start Date
18-10-2012 10:50 AM
End Date
18-10-2012 11:10 AM
Document Type
Event
Description
Cirrus clouds in the TTL play an important role on the radiation budget and thus the understanding of their optical properties together with the microphysical processes associated with their formation is quite important. In spite of the progress in theoretical research on the TTL cirrus (e.g., Koop et al., 2000; Peter et al., 2006), observational research is not enough because of the difficulty due to its height and coldness. On the other hand, research of cirrus clouds at 10 km height has been carried out since 1990s using aircraft and hydrometer sondes such as HYVIS (Murakami and Orikasa, 1997) and Replicator (Miloshevich and Heymsfield, 1996). As the Replicator collects replica particles on onboard films, it must be recovered after observation, which makes it rather difficult to apply to the TTL observations. On the other hand, HYVIS that transmits video picture to the ground station could be readily applied for the TTL if high-resolution monitoring is available. This presentation introduces newly refined HYVIS suitable for TTL observation and demonstrates the preliminary results obtained from the observations conducted in the subtropical region Okinawa in June 2012.
HYVIS TTL (Powerpoint Slides)
Development of new HYdorometer VIdeo Sonde (HYVIS) system for ice cloud observation in TTL region
East-West Center, University of Hawai'i at Manoa (Honolulu, Hawai'i)
Cirrus clouds in the TTL play an important role on the radiation budget and thus the understanding of their optical properties together with the microphysical processes associated with their formation is quite important. In spite of the progress in theoretical research on the TTL cirrus (e.g., Koop et al., 2000; Peter et al., 2006), observational research is not enough because of the difficulty due to its height and coldness. On the other hand, research of cirrus clouds at 10 km height has been carried out since 1990s using aircraft and hydrometer sondes such as HYVIS (Murakami and Orikasa, 1997) and Replicator (Miloshevich and Heymsfield, 1996). As the Replicator collects replica particles on onboard films, it must be recovered after observation, which makes it rather difficult to apply to the TTL observations. On the other hand, HYVIS that transmits video picture to the ground station could be readily applied for the TTL if high-resolution monitoring is available. This presentation introduces newly refined HYVIS suitable for TTL observation and demonstrates the preliminary results obtained from the observations conducted in the subtropical region Okinawa in June 2012.
