Last day of measurements

February 23rd, 2010 by Ed Kim
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Today is our last day of measurements. We took a radiometer measurement in the morning, and then dug the final snowpit in the exact spot that the radiometer was viewing during the whole experiment. That way, we will know exactly what the radiometer was seeing. The pit measurements took hours and it was cold today with the wind blowing. Ty spent nearly the entire day in the pit. Volunteer Michael Harvey, MD, helped. Still it took until sundown. The data appear to be OK for the whole experiment. What a huge relief!

Last week, our primary instrument (the radiometer) arrived barely in time & wasn’t even complete because of the big Washington DC snowstorm. But after many days of hard work by the whole experiment team & our great Storm Peak Lab hosts, we managed to get our measurements.

Snow measurements by satellite radiometers are the key to estimating how much water is held by snow across the globe.

snow water equivalent march 2005

Satellite-based map of water content of snow in March 2005. More snow water maps available from the NEO Website.

The radiometer we used in this experiment makes measurements the same way as radiometers on satellites such as the AMSR-E radiometer on the Aqua satellite. But since we are observing a much smaller area in this experiment than the space-based radiometers view (meters instead of kilometers), we have much less variability to deal with, *and* we took detailed measurements of the actual snow characteristics.

That means we should be able to develop a more accurate relationship between what a radiometer sees and the true snow water content. A more accurate relationship is what we need to improve satellite snow observations, and the most direct way to find that relationship is by doing a carefully-controlled field experiment…only it takes a lot of hard work by teams of scientists, engineers, and technicians to do one…plus a little luck. So many things have to come together, especially when the weather doesn’t fully cooperate.

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