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NASA EM31 Project Photometers
North Pole Expedition 2003
April 2003 Longyearbyen, Svalbard.
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NASA EM31 Project PhotometersNorth Pole Expedition 2003 |
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A
great lecture of the use of Photometers
April 2003 Longyearbyen, Svalbard. |
| North Pole Expedition 2003 |
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Please Note: The background on this page is an aerial photo of the sea ice near the island of Svalbard, Norway
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| 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.
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