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Computing entropy change in synoptic-scale system

Author

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  • Wu, Y.P.
  • Hu, Y.Y.
  • Cao, H.X.
  • Fu, C.F.
  • Feng, G.L.

Abstract

Thermodynamic entropy is of great importance in the atmospheric physics and chemistry process, because it is a non-conserved state function which making a system’s tendency towards spontaneous change. But how the entropy forces a synoptic-scale system is still not well known. In this paper, we analyzed the entropy change in atmosphere system, by calculating several examples of extra tropical cyclones over the Yellow River and its adjacent area in summer. The results show that a strong negative entropy flux appears over the north of a stationary front and the thresholds FeS≤−280 and ∂s∕∂t≤−50 are satisfied. At the same time, the change of total entropy is smaller than zero. Therefore the cyclone developed quickly and daily precipitation reached 371 mm, which is heaviest rain over the Yellows River area in summer. We suggest the dynamical entropy should be developed to improve the forecasting technique of heavy rainfall event in synoptic-scale.

Suggested Citation

  • Wu, Y.P. & Hu, Y.Y. & Cao, H.X. & Fu, C.F. & Feng, G.L., 2018. "Computing entropy change in synoptic-scale system," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 494(C), pages 163-168.
    • Handle: RePEc:eee:phsmap:v:494:y:2018:i:c:p:163-168
    DOI: 10.1016/j.physa.2017.12.010
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    References listed on IDEAS

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    1. Lucia, U., 2012. "Maximum or minimum entropy generation for open systems?," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 391(12), pages 3392-3398.
    2. Wu, Yong-Ping & Feng, Guo-Lin, 2015. "A new algorithm for seasonal precipitation forecast based on global atmospheric hydrological water budget," Applied Mathematics and Computation, Elsevier, vol. 268(C), pages 478-488.
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