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Impact of radiation frequency, precipitation radiative forcing, and radiation column aggregation on convection-permitting West African monsoon simulations

  • Toshi Matsui
  • Sara Q. Zhang
  • Stephen E. Lang
  • Wei-Kuo Tao
  • Charles Ichoku
  • Christa D. Peters-Lidard
Article
  • 180 Downloads

Abstract

In this study, the impact of different configurations of the Goddard radiation scheme on convection-permitting simulations (CPSs) of the West African monsoon (WAM) is investigated using the NASA-Unified WRF (NU-WRF). These CPSs had 3 km grid spacing to explicitly simulate the evolution of mesoscale convective systems (MCSs) and their interaction with radiative processes across the WAM domain and were able to reproduce realistic precipitation and energy budget fields when compared with satellite data, although low clouds were overestimated. Sensitivity experiments reveal that (1) lowering the radiation update frequency (i.e., longer radiation update time) increases precipitation and cloudiness over the WAM region by enhancing the monsoon circulation, (2) deactivation of precipitation radiative forcing suppresses cloudiness over the WAM region, and (3) aggregating radiation columns reduces low clouds over ocean and tropical West Africa. The changes in radiation configuration immediately modulate the radiative heating and low clouds over ocean. On the 2nd day of the simulations, patterns of latitudinal air temperature profiles were already similar to the patterns of monthly composites for all radiation sensitivity experiments. Low cloud maintenance within the WAM system is tightly connected with radiation processes; thus, proper coupling between microphysics and radiation processes must be established for each modeling framework.

Keywords

Convection-permitting simulation West African monsoon Radiation feedback Low cloud feedback 

Notes

Acknowledgements

This study has been funded by the NASA Modeling, Analysis and Prediction (MAP) program (NNH12ZDA001N-MAP: Dr. D. Considine at NASA HQ) and the NASA IDS program (NNH12ZDA001N-IDS: Drs. J. Kaye and H. Maring at NASA HQ). We also thank the NASA Advanced Supercomputing (NAS) Division and NCCS (Project Manager T. Lee at NASA HQ) for providing the computational resources to conduct and analyze the CPSs. The NASA-Unified WRF is maintained at NASA GSFC on the NCCS Discover computer and is available for public release (https://nuwrf.gsfc.nasa.gov/).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.NASA Goddard Space Flight CenterGreenbeltUSA
  2. 2.Earth System Science Interdisciplinary CenterUniversity of MarylandCollege ParkUSA
  3. 3.Science Systems and Applications, Inc.LanhamUSA
  4. 4.Science Applications International CorporationMcLeanUSA

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