Sun Photometer useage by the NASA team on longyearbyen

NASA EM31 Project Photometers

North Pole Expedition 2003
Dr. Rhett Herman
A great lecture of the use of Photometers
April 2003 Longyearbyen, Svalbard.
North Pole Expedition 2003
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This exhibit was posted on 5-29-2003

Please Note:  The background on this page is an aerial photo of the sea ice near the island of Svalbard, Norway

NASA EM-31 On the North Pole Page 8
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This is a sun photometer
Photo by C. Jeff Dyrek
This is a close-up view at a sun photometer.  Take a close look at the picture above and you will notice two aluminum angle brackets at the top and bottom of the unit.  These are the aiming devices.  You point the photometer unit toward the sun and align the light from the sun which is passing through the top hole so it is centered over the bottom bracket hole.  Now that the photometer is aligned the operator will record the numbers for the red and green spectrums.   These numbers, after being adjusted for the latitude of the readings, and compared to each other, gives the Aerosol Optical Thickness which can also be called the Aerosol Optical Depth.  In other words, the measurements measure the amount of dust and vapor particles in the atmosphere giving an account of pollution that is present.
Click Here's a link to the actual  NASA Site for this project.





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