1 / 8

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:

clive
Download Presentation

Arecibo’s Contribution

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related