Snow Field over Kansas 2/22 – 2/24 2013 Adjusted data.

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Presentation transcript:

Snow Field over Kansas 2/22 – 2/ Adjusted data

Comparison for Day/Night passes on 2/22/2013

Night and Day passes for 2/22

Cloud Type Mask for 2/22 Purple = Clear; any other color = cloud The cloud field for the Day passes looks reasonable. The Night case looks like it’s missing a lot, especially in the Northwest corner. I’m expecting some contamination.

Ranges for granule 0818: Scat angle: 94.0° ° Zen angle: 58.75° –61.51° Ranges for granule 1939 Scat angle: 130.9° –137.6° Zen angle: 48.88° –51.87° Ranges for granule 1941 Scat angle: 130.9° –133.6° Zen angle: 50.94° –51.47° Day and night peak at different reflectance values. However, peaks for day are very close, as is night peaks. Not sure if cloud contamination is effecting the night case. Moon phase 40-49° Original

Comparison between VIIRS lunar phase angle only and the adjusted data The peaks of the night passes have been shifted slightly to the left (smaller reflectance values), bring the day and night peaks closer together.

All day, and all night curves added together. Both curves about same width, but Day peaks at a lower reflectance value than night curve. Not sure if this could be due to cloud contamination, or something else. Original

Comparison between VIIRS lunar phase angle only and the adjusted data The shift in the night pass peak is easier to see with the totals. The curve is about the same width, but the peak is closer to the day peak.

Comparison between 2/22 Day Passes and 2/23 Night Passes

Runs with 2/23 night Pass 0759 that was originally tossed out due to glint Decided to stick with this one since a) the total curve is more comparable to the others and b) the phase angle is in the range where it would be adjusted

Ranges for granule 1939 Scat angle: 130.9° –137.6° Zen angle: 48.88° –51.87° Ranges for granule 1941 Scat angle: 130.9° –133.6° Zen angle: 50.94° –51.47° Ranges for granule 0759: Scat angle: ° – 99.97° Zen angle: 47.87° – 51.03° Day curves peaks are close. The night curve peaks are slightly more apart. Definite difference between Day and Night peaks. Moon phase 30-39° Original

Comparison between VIIRS lunar phase angle only and the adjusted data

Night and Day curves similar in width, but the peaks are definitely different. In the edge night image, the curve was wider, but peaked at the same reflectance as the Day curve. Could offset be due to glint angle? Original

Comparison between VIIRS lunar phase angle only and the adjusted data Very little difference is seen between the adjusted and unadjusted night curves. A check of the night pass granule shows a Moon phase angle of 30.63° Since the adjustment curve doesn’t start until 30 °, the adjustment to the night curve would be minimum.

Since the rest of the Kansas set has moon phase angles between 10° and 30.63°, there should be little to no change with the new adjustments. Slides with additional total curves will be added using the VIIRS phase angle only.

Comparison between VIIRS lunar phase angle only and the adjusted data