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Updated: Jun 18, 2026

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Published on: February 13, 2018

Examining spin-up behaviour within WRF dynamical downscaling applications.

Megan S Mallard1, Tanya L Spero1, Jared H Bowden2

  • 1US Environmental Protection Agency, Research Triangle Park, North Carolina, USA.

Geoscientific Model Development
|June 17, 2026
PubMed
Summary
This summary is machine-generated.

Regional climate models (RCMs) require sufficient spin-up time to reach equilibrium. This study found that spin-up effects persist seasonally, with soil moisture needing 1-4 years for stabilization in some regions.

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Last Updated: Jun 18, 2026

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Published on: July 19, 2016

Area of Science:

  • Climate modeling
  • Atmospheric science
  • Environmental science

Background:

  • Regional climate models (RCMs) simulate local climate conditions for adaptation planning.
  • Model spin-up, the period after initialization, is crucial for achieving dynamic equilibrium.
  • Complete spin-up is often infeasible due to computational costs.

Purpose of the Study:

  • To investigate the duration and seasonal behavior of model spin-up in RCM simulations.
  • To determine a pragmatic spin-up period minimizing initialization effects.

Main Methods:

  • Utilized two overlapping, dynamically downscaled simulations (31-year and 11-year) with the Weather Research and Forecasting (WRF) model over the contiguous US (CONUS).
  • Analyzed differences between simulations over their overlapping period, with the longer run having a 20-year spin-up.
  • Focused on surface and near-surface variables, including temperature and soil moisture.

Main Results:

  • Initial differences in temperature and soil moisture between simulations diminished over the first three months (autumn to winter).
  • Differences re-emerged and peaked during spring and summer due to increased evaporation and evaporative cooling.
  • Top-layer soil moisture exhibited prolonged spin-up, requiring 1-4 years in some CONUS regions.

Conclusions:

  • At least one year of spin-up is recommended for RCM applications to account for seasonal spin-up variations.
  • Specific regions and variables like soil moisture may necessitate longer spin-up durations (1-4 years) to avoid spurious results.