Evaluation of three planetary boundary layer schemes in the WRF model

Xiao Ming Hu, John W. Nielsen-Gammon, Fuqing Zhang

Research output: Contribution to journalArticlepeer-review

452 Scopus citations

Abstract

Accurate depiction of meteorological conditions, especially within the planetary boundary layer (PBL), is important for air pollution modeling, and PBL parameterization schemes play a critical role in simulating the boundary layer. This study examines the sensitivity of the performance of the Weather Research and Forecast (WRF) model to the use of three different PBL schemes [Mellor-Yamada-Janjic (MYJ), Yonsei University (YSU), and the asymmetric convective model, version 2 (ACM2)]. Comparison of surface and boundary layer observations with 92 sets of daily, 36-h high-resolution WRF simulations with different schemes over Texas in July-September 2005 shows that the simulations with the YSU and ACM2 schemes give much less bias than with the MYJ scheme. Simulations with the MYJ scheme, the only local closure scheme of the three, produced the coldest and moistest biases in the PBL. The differences among the schemes are found to be due predominantly to differencesin vertical mixing strength and entrainment of air from above the PBL. A sensitivity experiment with the ACM2 scheme confirms this diagnosis.

Original languageEnglish (US)
Pages (from-to)1831-1844
Number of pages14
JournalJournal of Applied Meteorology and Climatology
Volume49
Issue number9
DOIs
StatePublished - Sep 2010

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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