Optical depth measurements by shadow-band radiometers and their uncertainties.

Shadow-band radiometers in general, and especially the Multi-Filter Rotating Shadow-band Radiometer (MFRSR), are widely used for atmospheric optical depth measurements. The major programs running MFRSR networks in the United States include the Department of Energy Atmospheric Radiation Measurement (ARM) Program, U.S. Department of Agriculture UV-B Monitoring and Research Program, National Oceanic and Atmospheric Administration Surface Radiation (SURFRAD) Network, and NASA Solar Irradiance Research Network (SIRN). We discuss a number of technical issues specific to shadow-band radiometers and their impact on the optical depth measurements. These problems include instrument tilt and misalignment, as well as some data processing artifacts. Techniques for data evaluation and automatic detection of some of these problems are described.

[1]  Qilong Min,et al.  The rotating shadowband spectroradiometer (RSS) at SGP , 1999 .

[2]  Jerry L. Berndt,et al.  Data and signal processing of rotating shadowband spectroradiometer (RSS) data , 2002, SPIE Optics + Photonics.

[3]  Brian Cairns,et al.  Automated cloud screening algorithm for MFRSR data , 2004 .

[4]  Gerald M. Stokes,et al.  The Atmospheric Radiation Measurement Program , 2003 .

[5]  Qilong Min,et al.  Retrievals of thin cloud optical depth from a multifilter rotating shadowband radiometer , 2004 .

[6]  J. Berndt,et al.  Extraterrestrial solar spectrum 360–1050 nm from Rotating Shadowband Spectroradiometer measurements at the Southern Great Plains (ARM) site , 2003 .

[7]  A. Lacis,et al.  Separation of fine and coarse aerosol modes in MFRSR data sets , 2005 .

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

[9]  B. Forgan,et al.  Aerosol Measurement in the Australian Outback: Intercomparison of Sun Photometers , 2003 .

[10]  Nels S. Laulainen,et al.  Multiyear measurements of aerosol optical depth in the Atmospheric Radiation Measurement and Quantitative Links programs , 2001 .

[11]  B. McArthur,et al.  Baseline surface radiation network (BSRN/WCRP) New precision radiometry for climate research , 1998 .

[12]  J. Slusser,et al.  The USDA Ultraviolet Radiation Monitoring Program , 1998 .

[13]  Simultaneously retrieving cloud optical depth and effective radius for optically thin clouds , 2005 .

[14]  J. Michalsky,et al.  Cosine response characteristics of some radiometric and photometric sensors , 1995 .

[15]  J. Michalsky,et al.  Automated multifilter rotating shadow-band radiometer: an instrument for optical depth and radiation measurements. , 1994, Applied optics.

[16]  A. T. Young,et al.  Revised optical air mass tables and approximation formula. , 1989, Applied optics.

[17]  J. Michalsky,et al.  Objective algorithms for the retrieval of optical depths from ground-based measurements. , 1994, Applied optics.

[18]  J. Michalsky,et al.  Measurement errors in diffuse irradiance with non-Lambertian radiometers , 2003 .

[19]  Joseph J. Michalsky,et al.  An Update on SURFRAD—The GCOS Surface Radiation Budget Network for the Continental United States , 2005 .

[20]  Brian Cairns,et al.  Remote Sensing of Atmospheric Aerosols and Trace Gases by Means of Multifilter Rotating Shadowband Radiometer. Part I: Retrieval Algorithm , 2002 .

[21]  Brian Cairns,et al.  Characterization of atmospheric aerosols using MFRSR measurements , 2008 .