scholarly journals Retrieval of aerosol optical thickness and size distribution from the CIMEL Sun photometer over Inhaca Island, Mozambique

2003 ◽  
Vol 108 (D13) ◽  
pp. n/a-n/a ◽  
Author(s):  
Antonio J. Queface ◽  
Stuart J. Piketh ◽  
Harold J. Annegarn ◽  
Brent N. Holben ◽  
Rogerio J. Uthui
Keyword(s):  
Size Distribution ◽  
Optical Thickness ◽  
Aerosol Optical Thickness ◽  
Sun Photometer

Aerosol Optical Thickness Measurement with Elevation-Scanning Lidar

2015 ◽  
Vol 32 (7) ◽  
pp. 1364-1371
Author(s):  
Pavel I. Ionov ◽  
Andrew K. Mollner
Keyword(s):  
Optical Thickness ◽  
Thickness Measurement ◽  
High Accuracy ◽  
Sufficient Accuracy ◽  
Aerosol Optical Thickness ◽  
Calibration Standards ◽  
Accuracy Measurement ◽  
Scanning Lidar ◽  
Sun Photometer ◽  
High Accuracy Measurement

AbstractHigh-accuracy measurement of aerosol optical thickness (AOT) τa with an elevation-scanning lidar is demonstrated and the results are compared with a collocated Cimel 318 sun photometer. Linear regression of the time-coincident data from a 2-week measurement campaign with the two instruments is found to be τalidar = (1.00 ± 0.17)τaphot + (0.025 ± 0.019) (1σ). The method proved to have sufficient accuracy to measure AOTs of 0.1–0.2 commonly seen in relatively clear atmosphere. The measurement is absolute and thus does not depend on any external calibration standards.

scholarly journals Implications of satellite swath width on global aerosol optical thickness statistics

2012 ◽  
Vol 5 (2) ◽  
pp. 2795-2820 ◽  
Author(s):  
P. R. Colarco ◽  
L. A. Remer ◽  
R. A. Kahn ◽  
R. C. Levy ◽  
E. J. Welton
Keyword(s):  
Optical Thickness ◽  
Aerosol Optical Thickness ◽  
Temporal Scales ◽  
Spatial And Temporal Scales ◽  
Moderate Resolution ◽  
Direct Forcing ◽  
Resolution Imaging ◽  
Sun Photometer ◽  
Moderate Resolution Imaging Spectroradiometer ◽  
The Impact

Abstract. We assess the impact of swath width on the statistics of aerosol optical thickness (AOT) retrieved by satellite, as inferred from observations made by the Moderate Resolution Imaging Spectroradiometer (MODIS). Using collocated AERONET sun photometer observations we develop a correction to the MODIS data to account for calibration and algorithmic view angle dependency in the retrieved AOT. We sub-sample and correct the AOT data from the MODIS Aqua instrument along several candidate swaths of various widths for the years 2003–2011. We find that over ocean the global, annual mean AOT is within ± 0.01 of the full swath AOT for all of our sub-samples. Over land, however, most of our sub-samples are outside of this criterion range in the global, annual mean. Moreover, at smaller spatial and temporal scales we find wide deviation in the sub-sample AOT relative to the full swath over both land and ocean. In all, the sub-sample AOT is within ± 0.01 of the full swath value less than 25% of the time over land, and less than 50% of the time over ocean (less than 35% for all but the widest of our sub-sample swaths). These results suggest that future aerosol satellite missions having only narrow swath views may not sample the true AOT distribution sufficiently to reduce significantly the uncertainty in aerosol direct forcing of climate.

Retrieval of aerosol optical thickness by airborne sun photometer measurements during LACE'98

1999 ◽  
Vol 30 ◽  
pp. S437-S438
Author(s):  
Hagen Asseng ◽  
Wolfgang Armbruster ◽  
Lutz Bannehr ◽  
Ju¨rgen Fischer ◽  
Thomas Ruhtz
Keyword(s):  
Optical Thickness ◽  
Aerosol Optical Thickness ◽  
Sun Photometer

Evaluation of MODIS aerosol optical thickness over Europe using sun photometer observations

2008 ◽  
Vol 42 (9) ◽  
pp. 2187-2197 ◽  
Author(s):  
M. Schaap ◽  
R.M.A. Timmermans ◽  
R.B.A. Koelemeijer ◽  
G. de Leeuw ◽  
P.J.H. Builtjes
Keyword(s):  
Optical Thickness ◽  
Aerosol Optical Thickness ◽  
Sun Photometer

scholarly journals Comparisons of the TOMS aerosol index with Sun-photometer aerosol optical thickness: Results and applications

1999 ◽  
Vol 104 (D6) ◽  
pp. 6269-6279 ◽  
Author(s):  
N. C. Hsu ◽  
J. R. Herman ◽  
O. Torres ◽  
B. N. Holben ◽  
D. Tanre ◽  
...  
Keyword(s):  
Optical Thickness ◽  
Aerosol Optical Thickness ◽  
Sun Photometer ◽  
Toms Aerosol Index ◽  
Aerosol Index
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