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Arecibo’s Contribution

Arecibo’s Contribution. S. Raizada and C. A. Tepley. 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. AOT: Principle. Beer-Lambart’s Law:

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Arecibo’s Contribution

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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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