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Aerosol Light-scattering Enhancement Due to Water Uptake During Tcap Campaign : Volume 14, Issue 3 (05/02/2014)

By Titos, G.

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Book Id: WPLBN0003978476
Format Type: PDF Article :
File Size: Pages 33
Reproduction Date: 2015

Title: Aerosol Light-scattering Enhancement Due to Water Uptake During Tcap Campaign : Volume 14, Issue 3 (05/02/2014)  
Author: Titos, G.
Volume: Vol. 14, Issue 3
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Andrews, E., Jefferson, A., Alados-Arboledas, L., Sheridan, P. J., Ogren, J. A., Titos, G., & Lyamani, H. (2014). Aerosol Light-scattering Enhancement Due to Water Uptake During Tcap Campaign : Volume 14, Issue 3 (05/02/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Instituto Interuniversitario de Investigación del Sistema Tierra en Andalucía, IISTA-CEAMA, Universidad de Granada, Junta de Andalucía, Granada, 18006, Spain. Aerosol optical properties were measured by the DOE/ARM (US Department of Energy Atmospheric Radiation Measurements) Program Mobile Facility in the framework of the Two-Column Aerosol Project (TCAP) deployed at Cape Cod, Massachusetts, for a~one year period (from summer 2012 to summer 2013). Measured optical properties included aerosol light-absorption coefficient (Σap) at low relative humidity (RH) and aerosol light-scattering coefficient (Σsp) at low and at RH values varying from 30 to 85%, approximately. Calculated variables included the single scattering albedo (SSA), the scattering Ångström exponent (SAE) and the scattering enhancement factor (f(RH)). Over the period of measurement, f(RH = 80%) had a mean value of 1.9 ± 0.3 and 1.8 ± 0.4 in the PM10 and PM1 fractions, respectively. Higher f(RH = 80%) values were observed for wind directions from 0–180° (marine sector) together with high SSA and low SAE values. The wind sector from 225 to 315° was identified as an anthropogenically-influenced sector, and it was characterized by smaller, darker and less hygroscopic aerosols. For the marine sector, f(RH = 80%) was 2.2 compared with a value of 1.8 obtained for the anthropogenically-influenced sector. The air-mass backward trajectory analysis agreed well with the wind sector analysis. It shows low cluster to cluster variability except for air-masses coming from the Atlantic Ocean that showed higher hygroscopicity. Knowledge of the effect of RH on aerosol optical properties is of great importance for climate forcing calculations and for comparison of in-situ measurements with satellite and remote sensing retrievals. In this sense, predictive capability of f(RH) for use in climate models would be enhanced if other aerosol parameters could be used as proxies to estimate hygroscopic growth. Toward this goal, we propose an exponential equation that successfully estimates aerosol hygroscopicity as a function of SSA at Cape Cod. Further work is needed to determine if the equation obtained is valid in other environments.

Summary
Aerosol light-scattering enhancement due to water uptake during TCAP campaign

Excerpt
Anderson, T. L. and Ogren, J. A.: Determining aerosol radiative properties using the TSI 3563 integrating nephelometer, Aerosol Sci. Tech., 29, 57–69, 1998.; Bond, T. C., Anderson, T. L., and Campbell, D.: Calibration and intercomparison of filter-based measurements of visible light absorption by aerosols, Aerosol Sci. Tech., 30, 582–600, 1999.; Carrico, C. M., Rood, M. J., and Ogren, J. A.: Aerosol light scattering properties at Cape Grim, Tasmania, during the First Aerosol Characterization Experiment (ACE 1), J. Geophys. Res., 103, 16565–16574, 1998.; Carslaw, D. C. and Ropkins, K.: Openair – an R package for air quality data analysis, Environ. Modell. Softw., 27–28, 52–61, 2012.; Carrico, C. M., Rood, M. J., Ogren, J. A., Neusüb, C., Wiedensohler, A., and Heintzenberg, J.: Aerosol optical properties at Sagres, Portugal during ACE-2, Tellus B, 52, 694–715, 2000.; Carrico, C. M., Kus, P., Rood, M. J., Quinn, P. K., and Bates, T. S.: Mixtures of pollution, dust, sea salt, and volcanic aerosol during ACE-Asia: radiative properties as a function of relative humidity, J. Geophys. Research., 108, 8650, doi:10.1029/2003JD003405, 2003.; Clarke, A. D., Howell, S., Quinn, P. K., Bates, T. S., Ogren, J. A., Andrews, E., Jefferson, A., Massling, A., Mayol-Bracero, O., Maring, H., Savoie, D., and Cass, G.: INDOEX aerosol: a comparison and summary of chemical, microphysical, and optical properties observed from land, ship, and aircraft, J. Geophys. Res., 107, 8033, doi:10.1029/2001JD000572, 2002.; Hegg, D. A., Covert, D. S., Rood, M. J., and Hobbs, P. V.: Measurements of aerosol optical properties in marine air, J. Geophys. Res., 101, D8, 12893–12903, 1996.; Covert, D. S., Charlson, R. J., and Ahlquist, N. C.: A study of the relationship of chemical composition and humidity to light scattering by aerosols, J. Appl. Meteorol., 11, 968–976, 1972.; Delene, D. J. and Ogren, J. A.: Variability of aerosol optical properties at four North American surface monitoring sites, J. Atmos. Sci., 59, 1135–1149, 2002.; Draxler, R. R., Stunder, B., Rolph, G., Stein, A., and Taylor, A.: HYSPLIT4 User's Guide, NOAA Air Resources Laboratory (http://www.arl.noaa.gov/documents/reports/hysplit_user_guide.pdf, last access: February 2014), 2013.; Esteve, A. R., Ogren, J. A., Sheridan, P. J., Andrews, E., Holben, B. N., and Utrillas, M. P.: Sources of discrepancy between aerosol optical depth obtained from AERONET and in-situ aircraft profiles, Atmos. Chem. Phys., 12, 2987–3003, doi:10.5194/acp-12-2987-2012, 2012.; Fierz-Schmidhauser, R., Zieger, P., Wehrle, G., Jefferson, A., Ogren, J. A., Baltensperger, U., and Weingartner, E.: Measurement of relative humidity dependent light scattering of aerosols, Atmos. Meas. Tech., 3, 39–50, doi:10.5194/amt-3-39-2010, 2010a.; Fierz-Schmidhauser, R., Zieger, P., Gysel, M., Kammermann, L., DeCarlo, P. F., Baltensperger, U., and Weingartner, E.: Measured and predicted aerosol light scattering enhancement factors at the high alpine site Jungfraujoch, Atmos. Chem. Phys., 10, 2319–2333, doi:10.5194/acp-10-2319-2010, 2010b.; Fierz-Schmidhauser, R., Zieger, P., Vaishya, A., Monahan, C., Bialek, J., O'Dowd, C. D., Jennings, S. G., Baltensperger, U., and Weingartner, E.: Light scattering enhancement factors in the marine boundary layer (Mace Head, Ireland), J. Geophys. Res., 115, D20204, doi:10.1029/2009JD013755, 2010c.; Hänel, G. and Zankl, B.: Aerosol size and relative humidity: water uptake by mixtures of salts, Tellus, 31, 478–486, 1979.; Garland, R. M., Ravishan

 

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