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Contributions of Arecibo Observatory to Atmospheric Optical Thickness Using Sunphotometers and Radiometers

This paper discusses the methodology and advancements made by Arecibo Observatory in measuring aerosol optical thickness (AOT) utilizing sunphotometers and radiometers. It covers the characteristics of the instruments, including their fields of view and wavelengths. By applying Beer-Lambert's Law for calibration and measurement, the study illustrates the importance of precise observational techniques. Future endeavors include student training for operating radiometers, estimating diurnal variations of AOT, and the potential development of a mobile lidar system to enhance atmospheric analysis.

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Contributions of Arecibo Observatory to Atmospheric Optical Thickness Using Sunphotometers and Radiometers

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  1. Arecibo’s Contribution S. Raizada and C. A. Tepley

  2. AOT using Sunphotometers • 3 Radiometers • FOV ~ 2.5 deg • Two are identical and can give ozone, water vapor and AOT • One has 5 wavelengths: 380, 440,500,675 and 870 nm

  3. AOT: Principle • Beer-Lambart’s Law: Where, V is the measured voltage, V0 expresses the instrument calibration, d0 = the average sun-earth distance, d = the sun-earth distance on the day of the observation, m = solar zenith angle dependent air mass, τ is the optical depth

  4. Examples of Previous Measurements

  5. Examples of Previous Measurements

  6. Profiles of Aerosols3 or more color lidar required Nd:YAGDoublerMixerDye-laser Continuum, Inc: Nd:YAG ordered Apr 2007, installed Sep 2007; UV Mixing Package ordered Nov 2007, to be installed Apr 2008

  7. Aerosol Lidar Receiver and DAQ APD (1064 nm)DichroicsTransient Recorders PMTs (532/355 nm)ChopperFiberHV Scale: Receiver is ~18” long; PMTs are 1” dia. DAQ: Ethernet & LabView controlled

  8. Current and Future endeavors • Train some students to operate the two radiometers near the campaign site for inferring AOT during the campaign. • Try to estimate the diurnal variation of AOT, particle sizes and compare it with the chemical variation during the day. • To buy a dedicated 3 color YAG, to develop a mobile lidar system • Technical support required to integrate receivers and transmitter • Student involvement is crucial for observing and analysis

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