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Effects of organized convection parameterization on the MJO and precipitation in E3SMv1. Part I: Mesoscale heating

Journal Article · · Journal of Advances in Modeling Earth Systems
DOI:https://doi.org/10.1029/2020MS002401· OSTI ID:1819059
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. The National Center for Atmospheric Research
  2. University Corporation for Atmospheric Research
  3. NSF - NCAR
  4. National Center for Atmospheric Research, Boulder, CO
  5. LAWRENCE LIVERMORE
  6. Brookhaven National Laboratory
  7. Lawrence Livermore National Laboratory
  8. BATTELLE (PACIFIC NW LAB)
+ Show Author Affiliations

Mesoscale organization of convection is typically not represented in global circulation models, and hence its influence on the global circulation is not accounted for. The heating component of a parameterization that represents the dynamical and physical effects of circulations associated with organized convection, referred to as the multiscale coherent structure parameterization (MCSP), is implemented in the Energy Exascale Earth System Model version 1 (E3SMv1). Numerical simulations are conducted to assess its impact on the simulated climate. Besides E3SMv1 simulations, we performed high-resolution (1 km) simulations using the Weather Research and Forecasting (WRF) Model to determine the temperature tendencies induced by mesoscale convective systems embedded in deep convection. We tuned the free parameters of the MCSP based on the WRF simulations. MCSP heating enhances Kevin wave spectra in E3SMv1, improves the representation of the Madden-Julian Oscillation, and impacts on mean precipitation that vary with locations and seasons, including a reduction of biases over the tropical Pacific.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1819059
Report Number(s):
PNNL-SA-161035
Journal Information:
Journal of Advances in Modeling Earth Systems, Vol. 13, Issue 6
Country of Publication:
United States
Language:
English

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