A simple extension of the Louis method for rough surface layer modelling

I. Uno, X. M. Cai, D. G. Steyn, S. Emori

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)


The surface flux calculation method proposed by Louis (1979) is extended by allowing momentum and heat to have different roughness lengths (z0 and zT respectively). Our approach is to extend the traditional analysis by a more careful consideration of potential temperature structure near the surface. This consideration leads to a redefinition of the bulk Richardson number. For bulk transfer coefficients, our method shows a significant improvement over the original Louis method when compared with the theoretical surface-layer model applied to rough surfaces. Numerical experiments simulating sea breezes in 2D show that our extension is crucially important in simulating light wind and low humidity conditions.

Original languageEnglish
Pages (from-to)395-409
Number of pages15
JournalBoundary-Layer Meteorology
Issue number4
Publication statusPublished - Dec 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atmospheric Science


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