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Advanced Cloud Monitoring using Albedo, Brightness Temperature, and Water Vapor Measurements

Explore the cutting-edge capabilities of the CLEX-10 cloud products, which utilize albedo measurements in both daylight and nighttime conditions to effectively analyze cloud types and characteristics, employing 0.65 µm, 3.9 µm, and 10.7 µm metrics. This system interprets brightness temperatures and water vapor for improved cloud phase determination, facilitating enhanced weather forecasting. The integration of various measurement scales allows for precise identification of cloud types, from liquid water clouds to ice clouds, providing invaluable insight for meteorological applications.

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Advanced Cloud Monitoring using Albedo, Brightness Temperature, and Water Vapor Measurements

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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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