Statistics – Methodology
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.a41c0121s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #A41C-0121
Statistics
Methodology
0305 Aerosols And Particles (0345, 4801, 4906), 0345 Pollution: Urban And Regional (0305, 0478, 4251), 0360 Radiation: Transmission And Scattering, 3311 Clouds And Aerosols, 4801 Aerosols (0305, 4906)
Scientific paper
Observations by a highly sensitive visible and near infrared lidar flown on the NASA DC-8 Global Aerosol Backscatter Experiment in the early 1990's imaged the presence of aerosol structure in the above planetary boundary layer (PBL) troposphere down to background levels of aerosol cross section of less than 10-7 (1/m). Flights were throughout the Pacific basin region. Clearly seen in some data were aerosol plumes carried into the lower and mid troposphere through cloud convection and detrainment. At the top and immediately above the PBL were frequently a "cloud pumped" aerosol layer and less frequent are transport by cloud convection up to the mid troposphere, 4 km and above. Aerosol cross sections in these layers are typically an order of magnitude or more smaller than the cross sections in the PBL. Active laser profiling of the atmosphere from space initiated in 2003 with the Geoscience Laser Altimeter System (GLAS), and now continued as part of the Calipso mission, give the vertical distribution of aerosol cross sections on a global basis. Over the last four years we have been improving the methodology and accuracy of data product algorithms that provide the aerosol optical depth and extinction cross from the GLAS data. Aerosol cross sections are now retrieved throughout the cloud free troposphere. Results for night observations are thought to be accurate to values approaching near background levels. The overall zonal average of the retrieved global aerosol height distribution shows consistent characteristics. The question that may be asked is to what amount the average aerosol cross section in the above PBL troposphere is influenced by cloud transport. An initial analysis is presented.
Hart William D.
Hlavka Dennis L.
Palm Stephen P.
Spinhirne James D.
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