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T RIPLECLOUDS : INTRODUCING CLOUD INHOMOGENEITY INTO WEATHER MODELS

T RIPLECLOUDS : INTRODUCING CLOUD INHOMOGENEITY INTO WEATHER MODELS. Jon Shonk Robin Hogan. 1. frequency. Plane parallel. mean. ice water content. frequency. Fudge factor. 0.7. C LOUD I NHOMOGENEITY …. 2. C LOUD I NHOMOGENEITY …. Tripleclouds: how the method works.

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T RIPLECLOUDS : INTRODUCING CLOUD INHOMOGENEITY INTO WEATHER MODELS

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  1. TRIPLECLOUDS:INTRODUCING CLOUD INHOMOGENEITY INTO WEATHER MODELS Jon Shonk Robin Hogan

  2. 1 frequency Plane parallel mean ice water content frequency Fudge factor 0.7 CLOUD INHOMOGENEITY…

  3. 2 CLOUD INHOMOGENEITY… Tripleclouds: how the method works Comparison of Tripleclouds with the plane parallel method Comparison of Tripleclouds with the fudge factor method and the plane parallel method, using a radar dataset

  4. 3 frequency mean ice water content cumulative frequency 50 15 THE TRIPLECLOUDS CALCULATION…

  5. 4 Vertical resolution: ~ 500m Natural log of ice water content Horizontal resolution: ~ 5min (~ 4.5km) THE TRIPLECLOUDS CALCULATION… One cloud region per level Two cloud regions per level

  6. 5 Plane parallel ICA Tripleclouds ICA PLANE PARALLEL VERSUS TRIPLECLOUDS… Short-wave albedo bias Mean optical depth

  7. 5 Plane parallel ICA Tripleclouds ICA Subset 25 PLANE PARALLEL VERSUS TRIPLECLOUDS… Net outward long-wave flux density bias / W m-2 Mean optical depth

  8. 6 THE SUBSET 25 EXPERIMENT… height / m time / min • Unapproximated ICA run • Plane parallel ICA run • Fudge factor ICA run • Tripleclouds ICA run • Plane parallel single-column run • Fudge factor single-column run • Tripleclouds single-column run

  9. 7 Plane parallel ICA Plane parallel single column Fudge factor ICA Fudge factor single column Tripleclouds ICA Tripleclouds single column THE SUBSET 25 EXPERIMENT… Long-wave outward flux bias / W m-2 Short-wave albedo bias one cloudy region two cloudy regions one cloudy region two cloudy regions

  10. 8 Plane parallel ICA Plane parallel single column Fudge factor ICA Fudge factor single column Tripleclouds ICA Tripleclouds single column THE TESTSET 1 EXPERIMENT… Long-wave outward flux bias / W m-2 Short-wave albedo bias one cloudy region two cloudy regions one cloudy region two cloudy regions

  11. 9 Plane parallel single column Fudge factor single column Tripleclouds single column THE TESTSET 1 EXPERIMENT… height / m Long-wave heating rate bias / K d-1

  12. 10 Plane parallel ICA Fudge factor ICA Tripleclouds ICA TRIPLECLOUDS VS FUDGE FACTOR… Short-wave albedo bias Mean optical depth

  13. 10 Plane parallel ICA Fudge factor ICA Tripleclouds ICA TRIPLECLOUDS VS FUDGE FACTOR… Net long-wave outward flux density bias / W m-2 Mean optical depth

  14. 11 FUDGE FACTOR OF SET 25… Long-wave outward flux bias / W m-2 Short-wave albedo bias fudge factor

  15. 12 TO SUMMARISE… Tripleclouds improves on the plane-parallel method by reducing biases in both short and long-wave properties. The fudge-factor method canreduce biases in the top-of-atmosphere radiative properties, although increases biases in internal properties. Tripleclouds improves on this by acting to reduce biases in both top-of-atmosphere and internal radiative properties, without significant additional computer run time.

  16. 5 OPTIMISING PERCENTILES… Split percentile = 30 Short-wave albedo bias Split percentile = 50 Split percentile = 70 Mean optical depth

  17. 9 Plane parallel single column Fudge factor single column Tripleclouds single column THE TESTSET 1 EXPERIMENT… height / m Short-wave heating rate bias / K d-1

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