Connecting spatial and temporal scales of tropical precipitation in observations and the MetUM-GA6

Martin, Gill M.; Klingaman, Nicholas P.; Moise, Aurel F.

doi:https://doi.org/10.5194/gmd-10-105-2017

Articles | Volume 10, issue 1

https://doi.org/10.5194/gmd-10-105-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/gmd-10-105-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 10, issue 1

Model evaluation paper

|

06 Jan 2017

Model evaluation paper |

| 06 Jan 2017

Connecting spatial and temporal scales of tropical precipitation in observations and the MetUM-GA6

Gill M. Martin, Nicholas P. Klingaman, and Aurel F. Moise

Data sets

Unified Model Partnership Met Office UM Partnership Team http://www.metoffice.gov.uk/research/collaboration/um-partnership

CMORPH 3-hourly 0.25 degree data National Aeronautics and Space Administration ftp://ftp.cpc.ncep.noaa.gov/precip/global_CMORPH/3-hourly_025deg

TRMM - GES DISC - Goddard Earth Sciences Data and Information Sciences Center National Aeronautics and Space Administration https://disc.sci.gsfc.nasa.gov/TRMM

Short summary

We analyse and evaluate tropical rainfall variability in the MetUM-GA6 configuration at four different horizontal resolutions, plus one in which the convection parameterization has been switched off. Tropical deep convective rainfall in this model tends to be intermittent in space and time. This behaviour is largely independent of model resolution. Switching off the deep convection parameterization (at ~10 km resolution) results in isolated, but persistent, rainfall on the gridscale.