Photo by Dave Fratello. Focus To evaluate CAM5/CARMA at 1x1 degree resolution with aircraft observations. - Improve cirrus cloud representation in the.

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Presentation transcript:

Photo by Dave Fratello

Focus To evaluate CAM5/CARMA at 1x1 degree resolution with aircraft observations. - Improve cirrus cloud representation in the model Can we learn anything new about cirrus cloud microphysics with this comparison? - in situ clouds vs. detrained clouds?

We compare global model simulations to aircraft observations Model was run at 1x1 degree resolution Interpolated grid boxes along the flight track - 4 closest horizontal grid boxes - Last and current time step Model nudged by GEOS5 re-analysis data CAM5/CARMA uses subgrid parameterizations

Two flights that might be very different 03/06/14 03/09/14

Do They Look Different? 03/09/14 03/06/14

Do They Look Different? 03/09/14 03/06/14

Thin clouds on 03/06/14 flight appear to be in situ 22:21 to 22:30 UTC from 13.7km to 15km

Two cloud layers seen in 03/09/14 flight Image at 21:32 UTC

Low cirrus shows large bullet rosettes Images at 21:03 at 14.7 km

High cirrus layer shows small spheroids and plates Images from 21:17 – 21:45 UTC at 13.7 km to 15.7 km

What does our model show?

Model representation of 03/06/14 flight segment of interest

Flight Segment Profile

Model representation of 03/09/14 flight segment of interest

Flight Segment Profile

Recap Performed a comparison of the CAM5/CARMA model to observations from the Global Hawk at a 1x1 degree resolution Different types of in situ cirrus are seen in the observations, but the model ice habit in the 03/09/14 case disagrees. Model struggles capturing detailed features along the flight track

Future work Increase field of view to compare gross features such as cloud fields in the region - Use CALIPSO data Evaluate best ice habit assumptions for CARMA Continue to modify treatment of water vapor in CAM5/CARMA

Thank You

Extra Slides

Full 03/06/14 flight profile

Full 03/09/14 flight profile

Southern convection of 03/09/14 flight

Model representation of flight segment

Previous studies show CAM5/CARMA improves on CAM5 CAM5/CARMA excels at altitudes below Tropopause Figure 9 from Bardeen et al (2013) showing annual tropical averages compared to MLS, AIRS, COSMIC satellite data sets

We compare global model simulations to aircraft observations Model was run at a resolution of 1x1 degrees We then interpolated grid boxes along the flight track - 4 closest horizontal grid boxes - Last and current time step Model was nudged by GEOS5 re- analysis data CAM5/CARMA uses subgrid parameterizations