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Improving the QBO Forcing by Resolved Waves With Vertical Grid Refinement in E3SMv2

Journal Article · · Journal of Advances in Modeling Earth Systems
DOI:https://doi.org/10.1029/2024MS004473· OSTI ID:2565027
 [1];  [1];  [2];  [3];  [3]
  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  2. Los Alamos National Laboratory (LANL), Fort Collins, CO (United States)
  3. NSF National Center for Atmospheric Research, Boulder, CO (United States)
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The quasi-biennial oscillation (QBO) is the dominate mode of variability in the tropical stratosphere and plays an important role in stratospheric dynamics and chemistry. The QBO is notably deficient in many climate models, including the Energy Exascale Earth System Model (E3SM) developed by the US Department of Energy. In this work, we refine the lower stratospheric vertical grid spacing from roughly 1 km to 500 m to facilitate more realistic equatorial wave activity in the lower stratosphere in E3SM version 2. The refinement results in a simulated QBO with a reasonable amplitude and easterly-westerly transition in both directions, but still has a longer period than observed, slower easterly downward propagation speed, and shallower vertical depth. Similar refinement in the multi-scale modeling framework configuration of E3SM yields similar improvements. By analyzing the forcing contributions from different wave types, we find that most of the QBO forcing still comes from parameterized gravity wave drag from convection. The improved QBO forcing contributions from resolved waves, especially equatorial Kelvin waves and resolved small scale waves, can be attributed to the grid refinement.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
2565027
Alternate ID(s):
OSTI ID: 2565028
OSTI ID: 2571735
Report Number(s):
LLNL--JRNL-864116
Journal Information:
Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems Journal Issue: 5 Vol. 17; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

E3SM
QBO
atmospheric dynamics
numerical modeling