Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3413803m&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 13, CiteID L13803
Physics
64
Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Global Change: Atmosphere (0315, 0325), Atmospheric Processes: Radiative Processes
Scientific paper
During the Department of Energy Atmospheric Radiation Measurement Program (DOE ARM) sponsored Tropical Warm Pool International Cloud Experiment (TWP-ICE), ice crystals with maximum dimensions (D) < 50 μm were measured in aged cirrus and fresh anvils by a Cloud and Aerosol Spectrometer (CAS) and a Cloud Droplet Probe (CDP). The CAS/CDP ratio of the number concentrations of droplets with 3 < D < 50 μm, N3-50, averaged 0.98 +/- 0.69 in liquid clouds. However, N3-50, measured by the CAS averaged 91 +/- 127 times larger than N3-50 from the CDP in ice clouds. The CAS/CDP N3-50 ratio had a correlation coefficient of 0.387 with the concentration of particles with D > 100 μm measured by the Cloud Imaging Probe, suggesting that ice crystals may have been shattering or bouncing on the CAS inlet or protruding airflow shroud enhancing N>3-50,CAS. During the Costa Rica Aura Validation Experiment N3-50,CAS measured by a CAS without an airflow shroud were an order of magnitude less than those observed during TWP-ICE. This, and estimates of the maximum shattering based on the inlet and shroud sizes, suggest that the airflow shroud used during TWP-ICE was responsible for much of the shattering or bouncing.
Baumgardner Darrel
Freer Matt
Kok Gregory L.
Mace Gerald G.
McFarquhar Greg M.
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