The development of boundary layer structure index (BLSI) and its relationship with ground air quality
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Date
2018
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Abstract
Ambient air quality monitoring data and radar tracking sonde data were used to study
the atmospheric boundary layer structure (ABLS) and its changing characteristics over Wuhan.
The boundary layer structure index (BLSI), which can effectively describe the ABLS, was accordingly
developed and its ability to describe the near-surface air quality was analyzed. The results can be
summarized as follows. (1) An analysis of the ABLS during seriously polluted cases revealed that
the ABLS was usually dry and warm with a small ventilation index (VI); meanwhile, the ABLS
during clean cases was usually wet and cold with a large VI. (2) The correlation between the air
quality and BLSI at 100~300 m was good and passed the confidence level limit at 99%. Moreover,
the correlation coefficient increased with the altitude at 10~250 m and showed a downward trend
at 250~500 m. The correlation between the BLSI at 250 m and the ground air quality was the most
significant (r = 0.312), indicating that the layer ranging from 0 to 250 m is essential for determining
the ground air quality. (3) The BLSI considers both the vertical diffusion capability and horizontal
removal capability of the atmosphere. Therefore, it is highly capable of describing the ABLS and the
ground air quality
Description
Journal article
Keywords
Atmospheric boundary layer structure (ABLS), Air quality, Boundary layer structure index (BLSI)