NDLI: Sensitivity of air quality model prediction to parameterization of vertical eddy diffusivity

Content Provider	Springer Nature Link
Author	Han, Zhiwei Zhang, Meigen An, Junling
Copyright Year	2008
Abstract	This paper investigates the effects of vertical eddy diffusivities derived from the 3 different planetary boundary layer (PBL) schemes on predictions of chemical components in the troposphere of East Asia. Three PBL schemes were incorporated into a regional air quality model (RAQM) to represent vertical mixing process and sensitivity simulations were conducted with the three schemes while other options are identical. At altitudes <2km, all schemes exhibit similar skill for predicting SO2 and O3, but more difference in the predicted NOx concentration. The Gayno–Seaman scheme produces the smallest vertical eddy diffusivity (Kz) among all schemes, leading to higher SO2 and NOx concentrations near the surface than that from the other 2 schemes. However, the effect of vertical mixing on O3 concentration is complex and varies spatially due to chemistry. The Gayno–Seaman scheme predicts lower O3 concentrations than the other two schemes in the parts of northern China (generally VOC-limited) and higher ones in most parts of southern China (NOx-limited). The Byun and Dennis scheme produces the largest mixing depth in the daytime, which bring more NOx into upper levels, and the mixing depth predicted by the Gayno–Seaman scheme is the smallest, leading to higher NOx and lower O3 concentrations near the surface over intensive emission regions.
Starting Page	73
Ending Page	89
Page Count	17
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	9
Issue Number	1
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-09-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vertical mixing Planetary boundary layer Air quality model Chemistry Sensitivity simulation TRACE-P Oceanography Meteorology/Climatology Hydrogeology Mechanics Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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