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CLEX-10 Cloud Products

CLEX-10 Cloud Products. 1. Day/Night Albedo. 0.65 µm albedo during daylight (0-1  black-white) 3.9 µm albedo at night: A 3.9 = 1 − L 3.9 / B 3.9 ( T 10.7 ) count = 255*[( A 3.9 + 0.3)/0.6] 2 -0.3 − +0.3  0 – 255  black − white. 2. 10.7 µm Brightness Temperature.

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CLEX-10 Cloud Products

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  1. CLEX-10 Cloud Products

  2. 1. Day/Night Albedo • 0.65 µm albedo during daylight (0-1black-white) • 3.9 µm albedo at night: A3.9 = 1 −L3.9/B3.9(T10.7)count = 255*[(A3.9 + 0.3)/0.6]2-0.3 − +0.3  0 – 255  black − white

  3. 2. 10.7 µm Brightness Temperature • +30ºC to -20ºC, black – white • < -20ºC to -30ºC, blue • < -30ºC to -40ºC, cyan • < -40ºC to -50ºC, green • < -50ºC to -60ºC, yellow • < -60ºC to -70ºC, red • < -70ºC, magenta

  4. 3. Water Vapor • 6.7 µm brightness temperature • Standard CIRA water vapor scale

  5. 4. 3.9 µm Albedo • Night: black = cirrus, white = liquid water cloud, gray = everything else • Day: white = liquid water cloud, gray = everything else

  6. 5. 13.3 µm Brightness Temperature • Intended to determine cloud top height • Same scale as T10.7

  7. 6. T10.7 - T13.3 • Kelvins: +40 (black) to -8 (white)] • Possibly useful as a cloud mask

  8. 7. Experimental A3.9 Cloud Phase IF(T107 < T0 - 30. .OR. A39 == HUGE(A39)) THEN k = 251 ! Blue, ice cloud ELSE cloud_thresh = 0.09 liq_thresh = -5. ! kelvin IF(cz(ix, iy) > 0.015) THEN ! Sun up IF(A39 >= cloud_thresh) THEN IF(T107 > T0 + liq_thresh) THEN k = 249 ! Red, liquid water cloud ELSE k = 252 ! Yellow, mixed-phase cloud END IF ELSE IF(T107 <= 253.15) THEN k = 251 ! Blue, ice cloud ELSE ! Else, clear. Put in T10.7, gray-scaled between +15 C and -20 C ! k = 247*MAX(0., MIN(1., (288.15 - T107)/(288.15 - 253.15))) END IF END IF

  9. 7. Experimental A3.9 Cloud Phase ELSE ! Sun down IF(A39 >= cloud_thresh) THEN IF(T107 > T0 + liq_thresh) THEN k = 249 ! Red, liquid water cloud ELSE k = 252 ! Yellow, mixed-phase cloud END IF ELSE IF(A39 < -0.02) THEN k = 251 ! Blue, ice cloud ELSE ! Else, clear. Put in T10.7, gray-scaled between +15 C and -20 C ! k = 247*MAX(0., MIN(1., (288.15 - T107)/(288.15 - 253.15))) END IF END IF END IF

  10. 8. T10.7 10-Day Background • Warmest pixel at same time (±30 min) in last 10 days

  11. 9. T10.7 Cloud Mask • Cloudy if Tbackground− T10.7 ≥ 3 K (white) • Clear otherwise (put in T10.7)

  12. 10. Experimental A3.9 Cloud Phase Using T10.7 Cloud Mask • If clear, put in T10.7 • If cloudy, use T10.7 & A3.9 to determine phase: IF(T107 < T0 - 30. .OR. A39 == HUGE(A39)) THEN k = 251 ! Blue, ice cloud ELSE cloud_thresh = 0.09 liq_thresh = -5. IF(A39 >= cloud_thresh) THEN IF(T107 > T0 + liq_thresh) THEN k = 249 ! Red, liquid water cloud ELSE k = 252 ! Yellow, mixed-phase cloud END IF ELSE k = 251 ! Blue, ice cloud END IF Same code day and night

  13. 11. All Current Products • Loop of the latest image of all of the products to aid comparison • Need to slow the loop down and omit images that you don’t want to see

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