Chu et al. 2005

Chu, D.A., L.A. Remer, Y.J. Kaufman, B. Schmid, J. Redemann, K. Knobelspiesse, J.D. Chern, J. Livingston, P.B. Russell, X. Xiong, and W. Ridgway, 2005: Evaluation of aerosol properties over ocean from Moderate Resolution Imaging Spectroradiometer (MODIS) during ACE-Asia. J. Geophys. Res, 110, no. D07308, doi:10.1029/2004JD005208.

The Aerosol Characterization Experiment-Asia (ACE-Asia) was conducted in March-May 2001 in the western North Pacific in order to characterize the complex mix of dust, smoke, urban/industrial pollution, and background marine aerosol that is observed in that region in springtime. The Moderate Resolution Imaging Spectroradiometer (MODIS) provides a large-scale regional view of the aerosol during the ACE-Asia time period. Focusing only on aerosol retrievals over ocean, MODIS data show latitudinal and longitudinal variation in the aerosol characteristics. Typically, aerosol optical depth (τ_a) values at 0.55 μm are highest in the 30°-50° latitude band associated with dust outbreaks. Monthly mean τ_a in this band ranges ~0.40-70, although large differences between monthly mean and median values indicate the periodic nature of these dust outbreaks. The size parameters, fine mode fraction (η), and effective radius (r_eff) vary between monthly mean values of η = 0.47 and r_eff = 0.75 μm in the cleanest regions far offshore to approximately η = 0.85 and r_eff = 0.30 μm in near-shore regions dominated by biomass burning smoke. The collocated MODIS retrievals with airborne, ship-based, and ground-based radiometers measurements suggest that MODIS retrievals of spectral optical depth fall well within expected error (Δτ_a = ±0.03 ± 0.05τ_a) except in situations dominated by dust, in which cases MODIS overestimate both the aerosol loading and the aerosol spectral dependence. Such behavior is consistent with issues related to particle nonsphericity. Comparisons of MODIS-derived r_eff with AERONET retrievals at the few occurrences of collocations show MODIS systematically underestimates particle size by 0.2 μm. Multiple-year analysis of MODIS aerosol size parameters suggests systematic differences between the year 2001 and the years 2000 and 2002, which are traced to instrumental electronic cross talk. Sensitivity studies show that such calibration errors are negligible in τ_a retrievals but are more pronounced in size parameter retrievals, especially for dust and sea salt.

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Chu, D.A., Remer, L.A., Kaufman, Y.J., Schmid, B., Redemann, J., Knobelspiesse, K., Chern, J.D., Livingston, J., Russell, P.B., Xiong, X., and Ridgway, W.: Evaluation of aerosol properties over ocean from Moderate Resolution Imaging Spectroradiometer (MODIS) during ACE-Asia, J. Geophys. Res, 110(D07308), doi:10.1029/2004JD005208, 2005.

Chu, D.A., L.A. Remer, Y.J. Kaufman, B. Schmid, J. Redemann, K. Knobelspiesse, J.D. Chern, J. Livingston, P.B. Russell, X. Xiong, and W. Ridgway (2005), Evaluation of aerosol properties over ocean from Moderate Resolution Imaging Spectroradiometer (MODIS) during ACE-Asia, J. Geophys. Res, 110(D07308), doi:10.1029/2004JD005208.

Chu, D.A., L.A. Remer, Y.J. Kaufman, B. Schmid, J. Redemann, K. Knobelspiesse, J.D. Chern, J. Livingston, P.B. Russell, X. Xiong, and W. Ridgway, 2005: Evaluation of aerosol properties over ocean from Moderate Resolution Imaging Spectroradiometer (MODIS) during ACE-Asia. J. Geophys. Res, 110, no. D07308, doi:10.1029/2004JD005208.

Chu, D.A., et al. 2005, J. Geophys. Res, 110, no. D07308, doi:10.1029/2004JD005208.

Chu DA, Remer LA, Kaufman YJ, Schmid B, Redemann J, Knobelspiesse K, Chern JD, Livingston J, Russell PB, Xiong X, Ridgway W. Evaluation of aerosol properties over ocean from Moderate Resolution Imaging Spectroradiometer (MODIS) during ACE-Asia, J Geophys Res 2005;110:(D07308). doi:10.1029/2004JD005208.

D.A. Chu, L.A. Remer, Y.J. Kaufman, B. Schmid, J. Redemann, K. Knobelspiesse, J.D. Chern, J. Livingston, P.B. Russell, X. Xiong, W. Ridgway, J. Geophys. Res 110 (D07308), doi:10.1029/2004JD005208 (2005).