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Title: Atmospheric nitrogen dioxide measurements in Hong Kong using long path differential optical absorption spectroscopy
Other Titles: Shi yong chang lu jing cha fen xi shou guang pu ce liang Xianggang da qi zhong de er yang hua dan
Authors: Chan, Ka Lok ( 陳嘉樂)
Department: School of Energy and Environment
Degree: Master of Philosophy
Issue Date: 2011
Publisher: City University of Hong Kong
Subjects: Atmospheric nitrogen dioxide -- China -- Hong Kong -- Measurement.
Optical spectroscopy.
Notes: CityU Call Number: TD885.5.N5 C45 2011
xii, 114 leaves : col. ill. 30 cm.
Thesis (M.Phil.)--City University of Hong Kong, 2011.
Includes bibliographical references (leaves 102-113)
Type: thesis
Abstract: Long term measurements of atmospheric nitrogen dioxide (NO2) are performed using a Fibre Long Path Differential Optical Absorption Spectroscopy (LP-DOAS) instrument since December 2009 in Hong Kong. The instrument is using a high power blue LED with peak intensity at 450 nm as the light source to sample a path about 30 m to 50 m above the street level. Two setups with total absorption paths of 550 m and 3820 m are used in this study. The measurements are used to give better insights in surface air pollution conditions in Hong Kong. This thesis presents a detailed description of the instrument setup and the automated data retrieval. The LP-DOAS measurements were performed in Kowloon Tong and Mong Kok district in Hong Kong. The measurement results are compared to the concentration from a nearby monitoring station, operated by the Hong Kong Environmental Protection Department. Hourly averages of coinciding measurements are in reasonable agreement (R=0.73 on average). Additionally, NO2 coinciding measurements using the Ozone Monitoring Instrument (OMI) are compared to the LP-DOAS data. Monthly averaged LP-DOAS and OMI measurements correlate well (R=0.77). The comparison of mean weekly cycle however, displays different characteristics. The daily and weekly cycles of NO2 measured by the LP-DOAS are used to indentify different sources of NO2 in Hong Kong.
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