Dominance of organic aerosols in the marine boundary layer over the Gulf of Maine during NEAQS 2002 and their role in aerosol light scattering Export

@article{citeulike:327208, abstract = {Aerosol chemical, physical, and optical measurements were made aboard the NOAA R/V <i>Ronald H. Brown</i> off the coast of New England from July 12 through August 10, 2002, as part of the New England Air Quality Study (NEAQS). Measurements (generally 20 to 100 km from the coast) were made downwind of urban centers (New York City, Boston) and rural areas, and in air masses that had not been in contact with land for several days. On average during NEAQS, 75 \&plusmn; 8\% of the sub-10 \&\#956;m aerodynamic diameter dry aerosol mass sampled 18 m above the sea surface was in the sub-1 \&\#956;m fraction (size cut at 55\% RH). The major submicrometer aerosol components were ammonium sulfate and particulate organic matter (POM, defined here as 1.6 times the mass concentration of organic carbon) comprising more than 92 \&plusmn; 4\% of the total mass. Under northwesterly flow with an average submicrometer total mass concentrations of 11 \&plusmn; 4.5 \&\#956;g m^\&\#8722;3, POM was the dominant component (68 \&plusmn; 8\%) followed by (NH₄)_xH_ySO₄ (23 \&plusmn; 8\%), inorganic oxidized material (IOM) (6 \&plusmn; 4\%), and EC (3 \&plusmn; 1\%). Under southwesterly flow with an average submicrometer total mass concentrations of 30 \&plusmn; 11 \&\#956;g m^\&\#8722;3, (NH₄)_xH_ySO₄ was the dominant component (54 \&plusmn; 9\%) followed by POM (41 \&plusmn; 9\%), IOM (3 \&plusmn; 2\%), and EC (2 \&plusmn; 1\%). Mie calculations using submicrometer nonrefractory (NR) POM and NR (NH₄)_xH_ySO₄ + H₂O size distributions to calculate submicrometer light scattering (\&\#963;_sp) at a wavelength of 550 nm suggest that POM was a dominant chemical component contributing to aerosol light scattering (haze) during NEAQS 2002, and contributed 60 \&plusmn; 6 \% and 57 \&plusmn; 11 \% to \&\#963;_sp at 55\% RH during two pollution episodes off the New England Coast. These results are similar to those from the mid-Atlantic states during TARFOX but contrary to the long-term monitoring measurements over the continental northeast United States that show the New England haze is primarily a result of sulfate aerosol.}, author = {Bates, T. S. and Quinn, P. K. and Coffman, D. J. and Johnson, J. E. and Middlebrook, A. M.}, citeulike-article-id = {327208}, citeulike-linkout-0 = {http://www.agu.org/pubs/crossref/2005/2005JD005797.shtml}, citeulike-linkout-1 = {http://dx.doi.org/10.1029/2005JD005797}, day = {20}, doi = {10.1029/2005JD005797}, journal = {Journal of Geophysical Research}, keywords = {aerosol, organic, scattering, tropospheric, us}, month = {September}, pages = {D18202+}, posted-at = {2005-09-20 23:41:57}, priority = {2}, title = {Dominance of organic aerosols in the marine boundary layer over the Gulf of Maine during NEAQS 2002 and their role in aerosol light scattering}, url = {http://dx.doi.org/10.1029/2005JD005797}, volume = {110}, year = {2005} }

TY - JOUR ID - citeulike:327208 L3 - citeulike-article-id:327208 N2 - Aerosol chemical, physical, and optical measurements were made aboard the NOAA R/V <i>Ronald H. Brown</i> off the coast of New England from July 12 through August 10, 2002, as part of the New England Air Quality Study (NEAQS). Measurements (generally 20 to 100 km from the coast) were made downwind of urban centers (New York City, Boston) and rural areas, and in air masses that had not been in contact with land for several days. On average during NEAQS, 75 &plusmn; 8% of the sub-10 &#956;m aerodynamic diameter dry aerosol mass sampled 18 m above the sea surface was in the sub-1 &#956;m fraction (size cut at 55% RH). The major submicrometer aerosol components were ammonium sulfate and particulate organic matter (POM, defined here as 1.6 times the mass concentration of organic carbon) comprising more than 92 &plusmn; 4% of the total mass. Under northwesterly flow with an average submicrometer total mass concentrations of 11 &plusmn; 4.5 &#956;g m^&#8722;3, POM was the dominant component (68 &plusmn; 8%) followed by (NH₄)_xH_ySO₄ (23 &plusmn; 8%), inorganic oxidized material (IOM) (6 &plusmn; 4%), and EC (3 &plusmn; 1%). Under southwesterly flow with an average submicrometer total mass concentrations of 30 &plusmn; 11 &#956;g m^&#8722;3, (NH₄)_xH_ySO₄ was the dominant component (54 &plusmn; 9%) followed by POM (41 &plusmn; 9%), IOM (3 &plusmn; 2%), and EC (2 &plusmn; 1%). Mie calculations using submicrometer nonrefractory (NR) POM and NR (NH₄)_xH_ySO₄ + H₂O size distributions to calculate submicrometer light scattering (&#963;_sp) at a wavelength of 550 nm suggest that POM was a dominant chemical component contributing to aerosol light scattering (haze) during NEAQS 2002, and contributed 60 &plusmn; 6 % and 57 &plusmn; 11 % to &#963;_sp at 55% RH during two pollution episodes off the New England Coast. These results are similar to those from the mid-Atlantic states during TARFOX but contrary to the long-term monitoring measurements over the continental northeast United States that show the New England haze is primarily a result of sulfate aerosol. JF - Journal of Geophysical Research TI - Dominance of organic aerosols in the marine boundary layer over the Gulf of Maine during NEAQS 2002 and their role in aerosol light scattering VL - 110 SP - D18202 KW - aerosol KW - organic KW - scattering KW - tropospheric KW - us AU - Bates, TS AU - Quinn, PK AU - Coffman, DJ AU - Johnson, JE AU - Middlebrook, AM PY - 2005/09/20/ UR - http://dx.doi.org/10.1029/2005JD005797 ER -