Publication Abstracts

Yao and Cheng 2012

Yao, M.-S., and Y. Cheng, 2012: Cloud simulations in response to turbulence parameterizations in the GISS Model E GCM. J. Climate, 25, 4963-4974, doi:10.1175/JCLI-D-11-00399.1.

The response of cloud simulations to turbulence parameterizations is studied systematically using the GISS general circulation model (GCM) E2 employed in the Intergovernmental Panel on Climate Change's (IPCC) Fifth Assessment Report (AR5). Without the turbulence parameterization, the relative humidity (RH) and the low cloud cover peak unrealistically close to the surface; with the dry convection or with only the local turbulence parameterization, these two quantities improve their vertical structures, but the vertical transport of water vapor is still weak in the planetary boundary layers (PBLs); with both local and nonlocal turbulence parameterizations, the RH and low cloud cover have better vertical structures in all latitudes due to more significant vertical transport of water vapor in the PBL. The study also compares the cloud and radiation climatologies obtained from an experiment using a newer version of turbulence parameterization being developed at GISS with those obtained from the AR5 version. This newer scheme differs from the AR5 version in computing nonlocal transports, turbulent length scale, and PBL height and shows significant improvements in cloud and radiation simulations, especially over the subtropical eastern oceans and the southern oceans. The diagnosed PBL heights appear to correlate well with the low cloud distribution over oceans. This suggests that a cloud-producing scheme needs to be constructed in a framework that also takes the turbulence into consideration.

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BibTeX Citation

@article{ya06100c,
  author={Yao, M.-S. and Cheng, Y.},
  title={Cloud simulations in response to turbulence parameterizations in the GISS Model E GCM},
  year={2012},
  journal={J. Climate},
  volume={25},
  pages={4963--4974},
  doi={10.1175/JCLI-D-11-00399.1},
}

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RIS Citation

TY  - JOUR
ID  - ya06100c
AU  - Yao, M.-S.
AU  - Cheng, Y.
PY  - 2012
TI  - Cloud simulations in response to turbulence parameterizations in the GISS Model E GCM
JA  - J. Climate
VL  - 25
SP  - 4963
EP  - 4974
DO  - 10.1175/JCLI-D-11-00399.1
ER  -

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