NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Airborne Sunphotometer, Airborne in-situ, Space-borne, and Ground-Based Measurements of Troposoheric Aerosol in Ace-2We report on clear-sky column closure experiments performed in the Canary Islands during the second Aerosol Characterization Experiment (ACE-2) in June/July 1997. We present results obtained by combining airborne sunphotometer and in-situ aerosol measurements taken aboard the Pelican aircraft, space-borne NOAA/AVHRR data and ground-based lidars A wide range of aerosol types was encountered throughout the ACE-2 area, including background Atlantic marine, European pollution-derived, and African mineral dust. During !he two days discussed here, vertical profiles flown in cloud free air masses revealed three distinctly different layers: a marine boundary layer (MBL) with varying pollution levels, an elevated dust layer, and a very clean layer between the MBL and the dust layer. We found that the presence of the elevated dust layer removes the good agreement between satellite and sunphotometer AOD usually found in the absence of the dust layer. Using size-resolved composition information we have computed optical properties of the ambient aerosol from the in-situ measurements and subsequently compared those to the sunphotometer results. In the dust, the agreement in layer aerosol optical depth (380-1060 nm) is 3-8%. In the MBL there is tendency for the in-situ results to be slightly lower than the sunphotometer measurements (10-17% at 525 nm), but these differences are within the combined error bars of the measurements and computations.
Document ID
20000109959
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Schmid, Beat
(NASA Ames Research Center Moffett Field, CA United States)
Collins, D.
(NASA Ames Research Center Moffett Field, CA United States)
Gasso, S.
(NASA Ames Research Center Moffett Field, CA United States)
Ostrom, E.
(NASA Ames Research Center Moffett Field, CA United States)
Powell, D.
(NASA Ames Research Center Moffett Field, CA United States)
Welton, E.
(NASA Ames Research Center Moffett Field, CA United States)
Durkee, P.
(NASA Ames Research Center Moffett Field, CA United States)
Livingstron, J.
(NASA Ames Research Center Moffett Field, CA United States)
Russell, P.
(NASA Ames Research Center Moffett Field, CA United States)
Flagan, R.
(NASA Ames Research Center Moffett Field, CA United States)
Hipskind, R. Stephen
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: IGARSS 2000
Location: Honolulu, HI
Country: United States
Start Date: July 24, 2000
End Date: July 28, 2000
Funding Number(s)
PROJECT: RTOP 622-44-75-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available