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- W1968772981 abstract "[1] Several parameterizations of extinction coefficient (σ) and visibility (lv) as a function of temperature (T), liquid water equivalent snowfall rate (S), have been developed assuming a gamma size distribution for ice particles and using aircraft data collected in extratropical stratiform clouds. Using surface-based measurements (SBM) of S, T, relative humidity (RH), cloud ceiling (lce), and σ during the winter months in 2005, 2006, and 2007 at the Centre for Atmospheric Research Experiments site in Ontario, Canada, other parameterizations have been developed and compared with that based on the aircraft data. The analysis of the SBM data indicates that low lv is mainly associated with S. Both aircraft and SBM data indicate that there is a significant dependence of lv on S and a relatively weaker dependence on T. The observed lv is correlated with lce, but the dependence of lv on RH is relatively weak. There is some nonlinear dependence of lv on wind speed. Using SBM, several parameterizations of σ have been developed using a multiple linear regression method by increasing the number of terms starting with S. The addition of T increases the correlation coefficient (CC) r from 0.85 to 0.87. The addition of RH has no significant effect, but the inclusion of lce further improves the CC from 0.87 to 0.9. It was also found that both lv and lce can be described well using the inverse Gaussian probability density function. Model predictions using these parameterizations show that, when the model correctly forecasts the precipitation field, the predicted lv agreed well with observations." @default.
- W1968772981 created "2016-06-24" @default.
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- W1968772981 date "2009-10-03" @default.
- W1968772981 modified "2023-10-08" @default.
- W1968772981 title "Parameterization of visibility in snow: Application in numerical weather prediction models" @default.
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- W1968772981 doi "https://doi.org/10.1029/2008jd011130" @default.
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