Accessibility navigation


Ceilometer based analysis of Shanghai’s boundary layer height (under rain and fog free conditions)

Downloads

Downloads per month over past year

Peng, J., Grimmond, C. S. B., Fu, X. S., Chang, Y. Y., Zhang, G., Guo, J., Tang, C. Y., Gao, J., Xu, X. D. and Tan, J. G. (2017) Ceilometer based analysis of Shanghai’s boundary layer height (under rain and fog free conditions). Journal of Atmospheric and Oceanic Technology, 34 (4). pp. 749-764. ISSN 1520-0426

[img]
Preview
Text - Published Version
· Please see our End User Agreement before downloading.

2368Kb
[img]
Preview
Text - Accepted Version
· Please see our End User Agreement before downloading.

2215Kb

To link to this item DOI: 10.1175/JTECH-D-16-0132.1

Abstract/Summary

To investigate boundary layer dynamics of the coastal megacity Shanghai, backscatter data measured by a Vaisala CL51 ceilometer are analyzed with a modified ideal curve fitting algorithm. The boundary layer height (zi) retrieved by this method and from radiosondes compare reasonably overall. Analyses of mobile and stationary ceilometer data provide spatial and temporal characteristics of Shanghai’s boundary layer height. The consistency between when the ceilometer is moving and stationary highlights the potential of mobile observations of transects across cities. Analysis of 16 months of zi measured at FengXian in Shanghai, reveals that the diurnal variation of zi in the four seasons follows the expected pattern; for all seasons zi starts to increase at sunrise, reflecting the influence of solar radiation. However, the boundary layer height is generally higher in autumn and winter than in summer and spring (mean hourly averaged zi for days with low cloud fraction at 11:00 to 12:00 are 900 m, 654 m, 934 m and 768 m for spring, summer, autumn and winter, respectively). This is attributed to seasonal differences in the dominant meteorological conditions, including the effects of a sea breeze at the near-coastal FengXian site. Given the success of the retrieval method, other ceilometers installed across Shanghai are now being analyzed to understand more about the spatial dynamics of zi and to investigate in more detail effects of prevailing meso-scale circulations and their seasonal dynamics.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:68868
Publisher:American Meteorological Society

Download Statistics for this item.

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation