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Observations of tropospheric aerosols and NO2 in Hong Kong over 5 years using ground based MAX-DOAS

Chan, Ka Lok and Wiegner, Matthias and Wenig, Mark and Pöhler, Denis (2018) Observations of tropospheric aerosols and NO2 in Hong Kong over 5 years using ground based MAX-DOAS. Science of the Total Environment, 619, 1545 - 1556. Elsevier. ISSN 0048-9697

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Official URL: http://www.sciencedirect.com/science/article/pii/S0048969717328656

Abstract

In this paper, we present long term observations of atmospheric aerosols and nitrogen dioxide (NO2) in Hong Kong using a Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) instrument. Ground based MAX-DOAS measurements were performed over 5years from December 2010 to November 2015. Vertical distribution profiles of aerosols and NO2 were derived from MAX-DOAS O4 and NO2 observations by applying the optimal estimation method. Retrieved MAX-DOAS measurements of aerosols and NO2 show good agreement with sun photometer observation of aerosol optical depths (AODs) and long path DOAS measurement of ground level NO2 mixing ratios. Tropospheric vertical column densities (VCDs) of NO2 derived from MAX-DOAS measurements are used to validate OMI satellite NO2 observations. Daily data show reasonably good agreement with each other with Pearson correlation coefficient R=0.7. However, MAX-DOAS NO2 VCDs are on average higher than OMI observations by a factor of 2. Introducing aerosols in the air mass factor calculation would enhance the OMI VCDs by 7-13, the remaining discrepancy is mainly due to the differences in spatial coverage between the two instruments. Diurnal variation patterns of aerosols and NO2 indicated significant contributions from local anthropogenic emissions. Analysis of air mass transport shows that the enhancement of surface aerosols and NO2 concentrations mainly results from accumulation of local emissions under low wind speed conditions.

Item URL in elib:https://elib.dlr.de/129088/
Document Type:Article
Title:Observations of tropospheric aerosols and NO2 in Hong Kong over 5 years using ground based MAX-DOAS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Chan, Ka LokKa.Chan (at) dlr.deUNSPECIFIED
Wiegner, MatthiasLMU, MünchenUNSPECIFIED
Wenig, MarkLMU, MünchenUNSPECIFIED
Pöhler, DenisUniversity of HeidelbergUNSPECIFIED
Date:April 2018
Journal or Publication Title:Science of the Total Environment
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:619
Page Range:1545 - 1556
Publisher:Elsevier
ISSN:0048-9697
Status:Published
Keywords:Aerosol, Nitrogen dioxide, MAX-DOAS, AERONET, OMI, Air mass transport
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Chan, Ka Lok
Deposited On:23 Sep 2019 11:38
Last Modified:07 Oct 2019 13:44

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