1 / 19

T RIPLECLOUDS : INTRODUCING CLOUD INHOMOGENEITY INTO WEATHER MODELS

Tripleclouds method enhances weather modeling by introducing cloud inhomogeneity, reducing biases in radiative properties. It compares with other methods using radar datasets.

aaronlloyd
Download Presentation

T RIPLECLOUDS : INTRODUCING CLOUD INHOMOGENEITY INTO WEATHER MODELS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related