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Korean Meteorological Society (한국기상학회)
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A Study of the Effects of SST Deviations on Heavy Snowfall over the Yellow Sea

해수면 온도 변화가 서해상 강설에 미치는 영향 연구

  • Jeong, Jaein (School of Earth and Environmental Sciences, Seoul National University) ;
  • Park, Rokjin (School of Earth and Environmental Sciences, Seoul National University)
  • 정재인 (서울대학교 지구환경과학부) ;
  • 박록진 (서울대학교 지구환경과학부)
  • Received : 2013.01.09
  • Accepted : 2013.04.16
  • Published : 2013.06.30
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Abstract

We examine the effects of the sea surface temperature (SST) distribution on heavy snowfall over the Yellow Sea using high-resolution SST products and WRF (Weather Research and Forecasting) model simulations in 30 December 2010. First, we evaluate the model by comparing the simulated and observed fresh snowfall over the Korean peninsula (Ho-Nam province). The comparison shows that the model reproduces the distributions and magnitudes of the observed snowfall. We then conduct sensitivity model simulations where SST perturbations by ${\pm}1.1^{\circ}C$ relative to baseline SST values (averaged SST for $5{\sim}15^{\circ}C$) are uniformly specified over the region of interest. Results show that ${\pm}1.1^{\circ}C$ SST perturbation simulations result in changes of air temperature by $+0.37/-0.38^{\circ}C$, and by ${\pm}0.31^{\circ}C$ hPa for sea level pressure, respectively, relative to the baseline simulation. Atmospheric responses to SST perturbations are found to be relatively linear. The changes in SST appear to perturb precipitation variability accounting for 10% of snow and graupel, and 18% of snowfall over the Yellow Sea and Ho- Nam province, respectively. We find that anomalies of air temperature, pressure, and hydrometeors due to SST perturbation propagate to the upper part of cloud top up to 500 hPa and show symmetric responses with respect to SST changes.

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References

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