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Effects of grid spacing on high-frequency precipitation variance in coupled high-resolution global ocean–atmosphere models
Year:
2022
Source of publication :
Climate Dynamics
Authors :
Volume :
Co-Authors:
  • Charles X. Light, 
  • Brian K. Arbic, 
  • Paige E. Martin, 
  • Laurent Brodeau, 
  • J. Thomas Farrar, 
  • Stephen M. Griffies, 
  • Ben P. Kirtman, 
  • Lucas C. Laurindo, 
  • Dimitris Menemenlis, 
  • Andrea Molod, 
  • Arin D. Nelson, 
  • Ebenezer Nyadjro, 
  • Amanda K. O’Rourke, 
  • Jay F. Shriver, 
  • Leo Siqueira, 
  • R. Justin Small 
    Ehud Strobach 
Facilitators :
From page:
0
To page:
0
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Total pages:
1
)
Abstract:

High-frequency precipitation variance is calculated in 12 different free-running (non-data-assimilative) coupled high resolution atmosphere–ocean model simulations, an assimilative coupled atmosphere–ocean weather forecast model, and an assimilative reanalysis. The results are compared with results from satellite estimates of precipitation and rain gauge observations. An analysis of irregular sub-daily fluctuations, which was applied by Covey et al. (Geophys Res Lett 45:12514–12522, 2018. https://doi.org/10.1029/2018GL078926) to satellite products and low-resolution climate models, is applied here to rain gauges and higher-resolution models. In contrast to lower-resolution climate simulations, which Covey et al. (2018) found to be lacking with respect to variance in irregular sub-daily fluctuations, the highest-resolution simulations examined here display an irregular sub-daily fluctuation variance that lies closer to that found in satellite products. Most of the simulations used here cannot be analyzed via the Covey et al. (2018) technique, because they do not output precipitation at sub-daily intervals. Thus the remainder of the paper focuses on frequency power spectral density of precipitation and on cumulative distribution functions over time scales (2–100 days) that are still relatively “high-frequency” in the context of climate modeling. Refined atmospheric or oceanic model grid spacing is generally found to increase high-frequency precipitation variance in simulations, approaching the values derived from observations. Mesoscale-eddy-rich ocean simulations significantly increase precipitation variance only when the atmosphere grid spacing is sufficiently fine (< 0.5°). Despite the improvements noted above, all of the simulations examined here suffer from the “drizzle effect”, in which precipitation is not temporally intermittent to the extent found in observations.

Note:
Related Files :
Coupled ocean-atmosphere models
High-frequency precipitation
High-resolution models
Numerical modeling
precipitation
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Related Content
More details
DOI :
10.1007/s00382-022-06257-6
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
58649
Last updated date:
13/04/2022 17:43
Creation date:
13/04/2022 17:41
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Scientific Publication
Effects of grid spacing on high-frequency precipitation variance in coupled high-resolution global ocean–atmosphere models
  • Charles X. Light, 
  • Brian K. Arbic, 
  • Paige E. Martin, 
  • Laurent Brodeau, 
  • J. Thomas Farrar, 
  • Stephen M. Griffies, 
  • Ben P. Kirtman, 
  • Lucas C. Laurindo, 
  • Dimitris Menemenlis, 
  • Andrea Molod, 
  • Arin D. Nelson, 
  • Ebenezer Nyadjro, 
  • Amanda K. O’Rourke, 
  • Jay F. Shriver, 
  • Leo Siqueira, 
  • R. Justin Small 
    Ehud Strobach 
Effects of grid spacing on high-frequency precipitation variance in coupled high-resolution global ocean–atmosphere models

High-frequency precipitation variance is calculated in 12 different free-running (non-data-assimilative) coupled high resolution atmosphere–ocean model simulations, an assimilative coupled atmosphere–ocean weather forecast model, and an assimilative reanalysis. The results are compared with results from satellite estimates of precipitation and rain gauge observations. An analysis of irregular sub-daily fluctuations, which was applied by Covey et al. (Geophys Res Lett 45:12514–12522, 2018. https://doi.org/10.1029/2018GL078926) to satellite products and low-resolution climate models, is applied here to rain gauges and higher-resolution models. In contrast to lower-resolution climate simulations, which Covey et al. (2018) found to be lacking with respect to variance in irregular sub-daily fluctuations, the highest-resolution simulations examined here display an irregular sub-daily fluctuation variance that lies closer to that found in satellite products. Most of the simulations used here cannot be analyzed via the Covey et al. (2018) technique, because they do not output precipitation at sub-daily intervals. Thus the remainder of the paper focuses on frequency power spectral density of precipitation and on cumulative distribution functions over time scales (2–100 days) that are still relatively “high-frequency” in the context of climate modeling. Refined atmospheric or oceanic model grid spacing is generally found to increase high-frequency precipitation variance in simulations, approaching the values derived from observations. Mesoscale-eddy-rich ocean simulations significantly increase precipitation variance only when the atmosphere grid spacing is sufficiently fine (< 0.5°). Despite the improvements noted above, all of the simulations examined here suffer from the “drizzle effect”, in which precipitation is not temporally intermittent to the extent found in observations.

Scientific Publication
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