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Snow Field over Colorado/Nebraska 3/25 – 3/26 2013 PowerPoint Presentation
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Snow Field over Colorado/Nebraska 3/25 – 3/26 2013 - PowerPoint PPT Presentation


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Snow Field over Colorado/Nebraska 3/25 – 3/26 2013. Snow sector comparison for 3/25. There is a line where the granules meet – I haven’t figured out how to get rid of it yet.

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Presentation Transcript
slide2

Snow sector comparison for 3/25

There is a line where the granules meet – I haven’t figured out how to get rid of it yet.

slide3

Snow event started early afternoon 3/24 and continued on and off 3/25. There may be some cloud contamination, especially for night pass.

Ranges for granule 0837:

Scat angle: 107.3° -- 116.7°

Zen angle: 58.1° – 59.5°

Ranges for granule 1959

Scat angle: 145.7° – 148.4°

Zen angle: 39.3° – 40.6°

Ranges for granule 2000

Scat angle: 145.2° – 148.0°

Zen angle: 39.4° – 40.9°

In spite of differences in scattering and zenith angles between night and day passes, curves peak fairly close.

Moon phase 20-29°

slide5

Cloud Type Mask for 3/25

Red = Clear; any other color = cloud

While not as bad as in the DNB image, there is still a faint line where the granules meet

slide7

Snow sector comparison for 3/25 – 3/26

Larger sector used for this case, due to clear conditions and large snow field.

slide8

Ranges for granule 1959

Scat angle: 145.7° – 148.4°

Zen angle: 39.3° – 40.6°

Ranges for granule 2000

Scat angle: 145.2° – 148.0°

Zen angle: 39.4° – 40.9°

Ranges for granule 0819:

Scat angle: 98.0° -- 104.1°

Zen angle: 51.3° – 52.7°

Like previous case, peak values are fairly close despite angle differences. However, curves look more skewed.

Moon phase 10-19°

slide10

Cloud Type Mask for 3/25 and 3/26

Red = Clear; any other color = cloud

slide12

Snow sector comparison for 3/26 – 3/26

Original (smaller) sector used for this case, due to indications of snow field melting since night pass.

slide13

Ranges for granule 0819:

Scat angle: 98.0° -- 104.1°

Zen angle: 51.3° – 52.7°

Ranges for granule 1941

Scat angle: 133.3° – 140.2°

Zen angle: 39.3° – 40.6°

Day curve slightly offset from night curves

Curve for scattering angle 140-149° dropped due to insufficient data to make a smooth curve.

Moon phase 10-19°

slide14

In this graph, the day curve peaks at a lower reflectance value than night curve. This is the opposite of the first day.

Possible of the effects of melting during the day after the snow event?

slide15

Comparison between day pass 3/26 and night pass 3/27 not shown, due to possible cloud contamination.