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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.|
|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)
|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.|
|Online Catalog Link: ||http://lib.cityu.edu.hk/record=b4086192|
|Appears in Collections:||SEE - Master of Philosophy|
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