%0 Journal Article %1 Massoli:2009p1540 %A Massoli, P %A Bates, T %A Quinn, P %A Lack, D %A Baynard, T %A Lerner, B %A Tucker, S %A Brioude, J %A Stohl, A %A Williams, E %D 2009 %J Journal of Geophysical Research-Atmospheres %K imported %P -- %R Artn D00f07 Doi 10.1029/2008jd011604 %T Aerosol optical and hygroscopic properties during TexAQS-GoMACCS 2006 and their impact on aerosol direct radiative forcing %U http://links.isiglobalnet2.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=mekentosj&SrcApp=Papers&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000265329200004 %V 114 %X In situ measurements of aerosol optical and hygroscopic properties were made on board the National Oceanic and Atmospheric Administration R/V Ronald H. Brown during the Texas Air Quality Study-Gulf of Mexico Atmospheric Composition and Climate Study (TexAQS-GoMACCS). The aerosol light extinction coefficient (sigma(ep)) was measured at 355, 532, and 1064 nm at 25%, 60%, and 85% relative humidity (RII) for both sub-1- and sub-10-eta m-diameter particles with a cavity ring-down aerosol extinction spectrometer. The 532-nm sigma(ep) was coupled with the 532-nm light absorption coefficient (sigma(ap)) measured with a photoacoustic absorption spectrometer to calculate the aerosol single scattering albedo (omega) with absolute uncertainty < 0.01. The sigma(ep) dependence on RII was expressed in terms of gamma (gamma). The sampled aerosols covered a broad spectrum of gamma and omega values; aerosols from traffic emissions were hydrophobic and highly light-absorbing with gamma similar to 0.4 and omega similar to 0.6, whereas the regional aerosols exhibited variable values of both g and w. Aerosols with the highest sulfate content also had the highest gamma and omega values (>0.65 and >0.9, respectively). The optical data were used to estimate local, top of atmosphere aerosol-induced climate forcing (Delta F-R). The Delta F-R calculations were performed using both omega values measured at 25% RII and omega values converted to ambient RII. The calculated ambient Delta F-R ranged from -7 to -40 W/m(2) with absolute uncertainty between 0.7 and 2.5 W/m(2). The results show that including aerosol hygroscopic properties in climate calculations is critical for improving estimates of aerosol forcing on climate.

@article{Massoli:2009p1540, abstract = {In situ measurements of aerosol optical and hygroscopic properties were made on board the National Oceanic and Atmospheric Administration R/V Ronald H. Brown during the Texas Air Quality Study-Gulf of Mexico Atmospheric Composition and Climate Study (TexAQS-GoMACCS). The aerosol light extinction coefficient (sigma(ep)) was measured at 355, 532, and 1064 nm at 25%, 60%, and 85% relative humidity (RII) for both sub-1- and sub-10-eta m-diameter particles with a cavity ring-down aerosol extinction spectrometer. The 532-nm sigma(ep) was coupled with the 532-nm light absorption coefficient (sigma(ap)) measured with a photoacoustic absorption spectrometer to calculate the aerosol single scattering albedo (omega) with absolute uncertainty < 0.01. The sigma(ep) dependence on RII was expressed in terms of gamma (gamma). The sampled aerosols covered a broad spectrum of gamma and omega values; aerosols from traffic emissions were hydrophobic and highly light-absorbing with gamma similar to 0.4 and omega similar to 0.6, whereas the regional aerosols exhibited variable values of both g and w. Aerosols with the highest sulfate content also had the highest gamma and omega values (>0.65 and >0.9, respectively). The optical data were used to estimate local, top of atmosphere aerosol-induced climate forcing (Delta F-R). The Delta F-R calculations were performed using both omega values measured at 25% RII and omega values converted to ambient RII. The calculated ambient Delta F-R ranged from -7 to -40 W/m(2) with absolute uncertainty between 0.7 and 2.5 W/m(2). The results show that including aerosol hygroscopic properties in climate calculations is critical for improving estimates of aerosol forcing on climate.}, added-at = {2010-06-22T19:38:37.000+0200}, affiliation = {Massoli, P NOAA, Div Chem Sci, Earth Syst Res Lab, 325 Broadway, Boulder, CO 80309 USA NOAA, Div Chem Sci, Earth Syst Res Lab, 325 Broadway, Boulder, CO 80309 USA NOAA, Div Chem Sci, Earth Syst Res Lab, Boulder, CO 80309 USA NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA Norwegian Inst Air Res, Dept Reg {\&} Global Pollut Issues, N-2027 Kjeller, Norway Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA}, author = {Massoli, P and Bates, T and Quinn, P and Lack, D and Baynard, T and Lerner, B and Tucker, S and Brioude, J and Stohl, A and Williams, E}, biburl = {https://www.bibsonomy.org/bibtex/2e364f8e9276d8f0bd14fc5301a8d2f3a/gsmith}, date-added = {2010-03-10 16:47:38 -0500}, date-modified = {2010-03-10 16:48:24 -0500}, doi = {Artn D00f07 Doi 10.1029/2008jd011604}, interhash = {c0e8abb8f5dca83be0428d53a3bc65b9}, intrahash = {e364f8e9276d8f0bd14fc5301a8d2f3a}, journal = {Journal of Geophysical Research-Atmospheres}, keywords = {imported}, label = {rec-number 2075}, local-url = {file://localhost/Users/geoffreysmith/Documents/Papers/Journal%20of%20Geophysical%20Research-Atmospheres/2009/Journal%20of%20Geophysical%20Research-Atmospheres,%20114,%20-%202009-1.pdf}, month = Apr, note = {435FL Times Cited:2 Cited References Count:56}, pages = {--}, pmid = {000265329200004}, rating = {0}, timestamp = {2010-06-22T19:39:15.000+0200}, title = {Aerosol optical and hygroscopic properties during TexAQS-GoMACCS 2006 and their impact on aerosol direct radiative forcing}, uri = {papers://E88B624E-D406-46FF-9D95-BB9C1AAE3FDC/Paper/p1540}, url = {http://links.isiglobalnet2.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=mekentosj&SrcApp=Papers&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000265329200004}, volume = 114, year = 2009 }