Intercomparison of pulsed lidar data with flight level CW lidar data and modeled backscatter from measured aerosol microphysics near Japan and Hawaii
| Autor: | D. A. Bowdle, James D. Spinhirne, Rudolf F. Pueschel, Jeffry Rothermel, D. R. Cutten, Antony D. Clarke, Robert T. Menzies, Vandana Srivastava |
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| Rok vydání: | 1998 |
| Předmět: |
Atmospheric Science
Flight level Ecology Microphysics Backscatter Planetary boundary layer Paleontology Soil Science Forestry Aquatic Science Oceanography Aerosol Troposphere Geophysics Lidar Altitude Space and Planetary Science Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Environmental science Astrophysics::Earth and Planetary Astrophysics Physics::Atmospheric and Oceanic Physics Earth-Surface Processes Water Science and Technology Remote sensing |
| Zdroj: | Journal of Geophysical Research: Atmospheres. 103:19649-19661 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/98jd01155 |
| Popis: | Aerosol backscatter coefficient data were examined from two nights near Japan and Hawaii undertaken during NASA's Global Backscatter Experiment (GLOBE) in May-June 1990. During each of these two nights the aircraft traversed different altitudes within a region of the atmosphere defined by the same set of latitude and longitude coordinates. This provided an ideal opportunity to allow flight level focused continuous wave (CW) lidar backscatter measured at 9.11-micron wavelength and modeled aerosol backscatter from two aerosol optical counters to be compared with pulsed lidar aerosol backscatter data at 1.06- and 9.25-micron wavelengths. The best agreement between all sensors was found in the altitude region below 7 km, where backscatter values were moderately high at all three wavelengths. Above this altitude the pulsed lidar backscatter data at 1.06- and 9.25-micron wavelengths were higher than the flight level data obtained from the CW lidar or derived from the optical counters, suggesting sample volume effects were responsible for this. Aerosol microphysics analysis of data near Japan revealed a strong sea-salt aerosol plume extending upward from the marine boundary layer. On the basis of sample volume differences, it was found that large particles were of different composition compared with the small particles for low backscatter conditions. |
| Databáze: | OpenAIRE |
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