Aerosol Optical Depth over the Arctic Snow-Covered Regions Derived from Dual-Viewing Satellite Observations

Aerosol properties over the Arctic snow-covered regions are sparsely provided by temporal and spatially limited in situ measurements or active Lidar observations. This introduces large uncertainties for the understanding of aerosol effects on Arctic climate change. In this paper, aerosol optical depth (AOD) is derived using the advanced along-track scanning radiometer (AATSR) instrument. The basic idea is to utilize the dual-viewing observation capability of AATSR to reduce the impacts of AOD uncertainties introduced by the absolute wavelength-dependent error on surface reflectance estimation. AOD is derived assuming that the satellite observed surface reflectance ratio can be well characterized by a snow bidirectional reflectance distribution function (BRDF) model with a certain correction direct from satellite top of the atmosphere (TOA) observation. The aerosol types include an Arctic haze aerosol obtained from campaign measurement and Arctic background aerosol (maritime aerosol) types. The proper aerosol type is selected during the iteration step based on the minimization residual. The algorithm has been used over Spitsbergen for the spring period (April–May) and the AOD spatial distribution indicates that the retrieval AOD can capture the Arctic haze event. The comparison with AERONET observations shows promising results, with a correlation coefficient R = 0.70. The time series analysis shows no systematical biases between AATSR retrieved AOD and AERONET observed ones.

[1]  F. Bréon,et al.  Remote sensing of aerosols by using polarized, directional and spectral measurements within the A-Train: the PARASOL mission , 2011 .

[2]  Peter R. J. North,et al.  The inter-comparison of major satellite aerosol retrieval algorithms using simulated intensity and polarization characteristics of reflected light , 2009 .

[3]  V. Salomonson,et al.  Estimating fractional snow cover from MODIS using the normalized difference snow index , 2004 .

[4]  A. Stohl,et al.  Arctic smoke – record high air pollution levels in the European Arctic due to agricultural fires in Eastern Europe in spring 2006 , 2006 .

[5]  Y. Arnaud,et al.  High-accuracy measurements of snow Bidirectional Reflectance Distribution Function at visible and NIR wavelengths - comparison with modelling results , 2009 .

[6]  Yong Xue,et al.  Aerosol optical depth retrieval over snow using AATSR data , 2013 .

[7]  C. Justice,et al.  Atmospheric correction of visible to middle-infrared EOS-MODIS data over land surfaces: Background, operational algorithm and validation , 1997 .

[8]  Meinrat O. Andreae,et al.  Aerosol cloud precipitation interactions. Part 1. The nature and sources of cloud-active aerosols , 2008 .

[9]  A. Smirnov,et al.  AERONET-a federated instrument network and data archive for aerosol Characterization , 1998 .

[10]  R. J. Flowerdew,et al.  An approximation to improve accuracy in the derivation of surface reflectances from multi‐look satellite radiometers , 1995 .

[11]  Yong Xue,et al.  Aerosol optical depth retrieval in the Arctic region using MODIS data over snow , 2013 .

[12]  G. Shaw.  The Arctic Haze Phenomenon , 1995 .

[13]  T. Eck,et al.  An emerging ground-based aerosol climatology: Aerosol optical depth from AERONET , 2001 .

[14]  L. Thomason,et al.  Volcanic perturbation of the atmosphere in both polar regions: 1991–1994 , 1996 .

[15]  G. Leeuw,et al.  Post-processing to remove residual clouds from aerosol optical depth retrieved using the Advanced Along Track Scanning Radiometer , 2016 .

[16]  P. Koepke,et al.  Optical Properties of Aerosols and Clouds: The Software Package OPAC , 1998 .

[17]  John P. Burrows,et al.  The detection of cloud-free snow-covered areas using AATSR measurements , 2010 .

[18]  Alexei Lyapustin,et al.  Retrieval of snow grain size over Greenland from MODIS. , 2009 .

[19]  E. Keith Bigg,et al.  Source and evolution of the marine aerosol—A new perspective , 2005 .

[20]  Yongwon Kim,et al.  Possible effect of boreal wildfire soot on Arctic sea ice and Alaska glaciers , 2005 .

[21]  John P. Burrows,et al.  Remote sensing of aerosols over snow using infrared AATSR observations , 2011 .

[22]  Alexander Smirnov,et al.  Aerosol Remote Sensing in Polar Regions , 2015 .

[23]  A. Stohl,et al.  Around the world in 17 days - hemispheric-scale transport of forest fire smoke from Russia in May 2003 , 2004 .

[24]  Teruo Aoki,et al.  Effects of snow physical parameters on spectral albedo and bidirectional reflectance of snow surface , 2000 .

[25]  Anders Ångström,et al.  On the Atmospheric Transmission of Sun Radiation and on Dust in the Air , 1929 .

[26]  Eleonora P. Zege,et al.  Reflective properties of natural snow: approximate asymptotic theory versus in situ measurements , 2005, IEEE Transactions on Geoscience and Remote Sensing.