1 / 18

Evaluation of cirrus microphysics in CAM5 using aircraft data

Evaluation of cirrus microphysics in CAM5 using aircraft data. C. Bardeen, A. Gettelman , E. Jensen ATTREX Science Team Meeting October 24, 2013. Ice Water Path. Bardeen et al., [2013]. IWP: Tropical Bias. Global Tropics. IWP: Tropics, JF. Cloud Fraction & Ice Water Content. IWC Bias.

wilona
Download Presentation

Evaluation of cirrus microphysics in CAM5 using aircraft data

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. Evaluation of cirrus microphysics in CAM5 using aircraft data C. Bardeen, A. Gettelman, E. Jensen ATTREX Science Team Meeting October 24, 2013

  2. Ice Water Path Bardeen et al., [2013]

  3. IWP: Tropical Bias Global Tropics

  4. IWP: Tropics, JF

  5. Cloud Fraction & Ice Water Content

  6. IWC Bias Low Z, High IWC: 2C-ICE > DARDAR High Z, Low IWC: DARDAR > 2C-ICE

  7. SPartICus Deng et al., [2012]

  8. SD-CAM: Tropical T, H2O, RH CAM5 relative humidity too high

  9. RH: Tropics, JF, 100 hPa

  10. ATTREX2: T, Q, RH, March 1, 2013

  11. ATTREX2: CF, N, M, March 1, 2013

  12. Clear Sky: RH vs T Krämer et al., [2009] ATTREX 1 & 2 Don’t see higher frequencies of RH > 100% when T < 190 K like Krämer et al. [2009]

  13. Cloudy: RH vs T Krämer et al., [2009] ATTREX 1 & 2 Don’t see as much higher frequencies of RH > 100% when T < 190 K like Krämer et al. [2009].

  14. Cloud N & Re vs T Krämer et al., [2009] ATTREX 1 & 2

  15. Subgrid Scale Clouds • Cloud Fraction • Wilson & Ballard [1999] • CF α ice mass • Subgrid Saturation • Nucleation • Growth • Siceα 1/CF Many clouds should fill the gridbox, but never get CF = 1.0 in model

  16. Model: RH vs T ATTREX 1 & 2 CAM/CARMA Clear GridboxAvg Cloudy

  17. Model: In-Cloud N & Re vs T ATTREX 1 & 2 CAM/CARMA Concentration much lower and effective radius too big

  18. Summary • Significant difference between DARDAR and 2C-ICE IWP, but clear tropical bias in the models • Relative humidity too high in CAM5 • ATTREX RHvsT looks like Krämer et al., but not as high at low T • Model low in ice concentration and high in effective radius • How to deal with subgrid scale clouds: saturation, cloud fraction, …?

More Related