Intra-pixel variability in satellite tropospheric NO2 column densities derived from simultaneous space-borne and airborne observations over the South African Highveld
Aircraft measurements of NO2 using an imaging differential optical absorption spectrometer (iDOAS) instrument over the South African Highveld region in August 2007 are presented and compared to satellite measurements from OMI and SCIAMACHY. In situ aerosol and trace-gas vertical profile measurements...
Published in: | Atmospheric Measurement Techniques |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/amt-11-2797-2018 https://noa.gwlb.de/receive/cop_mods_00006134 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006091/amt-11-2797-2018.pdf https://amt.copernicus.org/articles/11/2797/2018/amt-11-2797-2018.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00006134 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00006134 2023-05-15T13:06:16+02:00 Intra-pixel variability in satellite tropospheric NO2 column densities derived from simultaneous space-borne and airborne observations over the South African Highveld Broccardo, Stephen Heue, Klaus-Peter Walter, David Meyer, Christian Kokhanovsky, Alexander van der A, Ronald Piketh, Stuart Langerman, Kristy Platt, Ulrich 2018-05 electronic https://doi.org/10.5194/amt-11-2797-2018 https://noa.gwlb.de/receive/cop_mods_00006134 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006091/amt-11-2797-2018.pdf https://amt.copernicus.org/articles/11/2797/2018/amt-11-2797-2018.pdf eng eng Copernicus Publications Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-11-2797-2018 https://noa.gwlb.de/receive/cop_mods_00006134 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006091/amt-11-2797-2018.pdf https://amt.copernicus.org/articles/11/2797/2018/amt-11-2797-2018.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/amt-11-2797-2018 2022-02-08T22:59:09Z Aircraft measurements of NO2 using an imaging differential optical absorption spectrometer (iDOAS) instrument over the South African Highveld region in August 2007 are presented and compared to satellite measurements from OMI and SCIAMACHY. In situ aerosol and trace-gas vertical profile measurements, along with aerosol optical thickness and single-scattering albedo measurements from the Aerosol Robotic Network (AERONET), are used to devise scenarios for a radiative transfer modelling sensitivity study. Uncertainty in the air-mass factor due to variations in the aerosol and NO2 profile shape is constrained and used to calculate vertical column densities (VCDs), which are compared to co-located satellite measurements. The lower spatial resolution of the satellites cannot resolve the detailed plume structures revealed in the aircraft measurements. The airborne DOAS in general measured steeper horizontal gradients and higher peak NO2 vertical column density. Aircraft measurements close to major sources, spatially averaged to the satellite resolution, indicate NO2 column densities more than twice those measured by the satellite. The agreement between the high-resolution aircraft instrument and the satellite instrument improves with distance from the source, this is attributed to horizontal and vertical dispersion of NO2 in the boundary layer. Despite the low spatial resolution, satellite images reveal point sources and plumes that retain their structure for several hundred kilometres downwind. Article in Journal/Newspaper Aerosol Robotic Network Niedersächsisches Online-Archiv NOA Atmospheric Measurement Techniques 11 5 2797 2819 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Broccardo, Stephen Heue, Klaus-Peter Walter, David Meyer, Christian Kokhanovsky, Alexander van der A, Ronald Piketh, Stuart Langerman, Kristy Platt, Ulrich Intra-pixel variability in satellite tropospheric NO2 column densities derived from simultaneous space-borne and airborne observations over the South African Highveld |
topic_facet |
article Verlagsveröffentlichung |
description |
Aircraft measurements of NO2 using an imaging differential optical absorption spectrometer (iDOAS) instrument over the South African Highveld region in August 2007 are presented and compared to satellite measurements from OMI and SCIAMACHY. In situ aerosol and trace-gas vertical profile measurements, along with aerosol optical thickness and single-scattering albedo measurements from the Aerosol Robotic Network (AERONET), are used to devise scenarios for a radiative transfer modelling sensitivity study. Uncertainty in the air-mass factor due to variations in the aerosol and NO2 profile shape is constrained and used to calculate vertical column densities (VCDs), which are compared to co-located satellite measurements. The lower spatial resolution of the satellites cannot resolve the detailed plume structures revealed in the aircraft measurements. The airborne DOAS in general measured steeper horizontal gradients and higher peak NO2 vertical column density. Aircraft measurements close to major sources, spatially averaged to the satellite resolution, indicate NO2 column densities more than twice those measured by the satellite. The agreement between the high-resolution aircraft instrument and the satellite instrument improves with distance from the source, this is attributed to horizontal and vertical dispersion of NO2 in the boundary layer. Despite the low spatial resolution, satellite images reveal point sources and plumes that retain their structure for several hundred kilometres downwind. |
format |
Article in Journal/Newspaper |
author |
Broccardo, Stephen Heue, Klaus-Peter Walter, David Meyer, Christian Kokhanovsky, Alexander van der A, Ronald Piketh, Stuart Langerman, Kristy Platt, Ulrich |
author_facet |
Broccardo, Stephen Heue, Klaus-Peter Walter, David Meyer, Christian Kokhanovsky, Alexander van der A, Ronald Piketh, Stuart Langerman, Kristy Platt, Ulrich |
author_sort |
Broccardo, Stephen |
title |
Intra-pixel variability in satellite tropospheric NO2 column densities derived from simultaneous space-borne and airborne observations over the South African Highveld |
title_short |
Intra-pixel variability in satellite tropospheric NO2 column densities derived from simultaneous space-borne and airborne observations over the South African Highveld |
title_full |
Intra-pixel variability in satellite tropospheric NO2 column densities derived from simultaneous space-borne and airborne observations over the South African Highveld |
title_fullStr |
Intra-pixel variability in satellite tropospheric NO2 column densities derived from simultaneous space-borne and airborne observations over the South African Highveld |
title_full_unstemmed |
Intra-pixel variability in satellite tropospheric NO2 column densities derived from simultaneous space-borne and airborne observations over the South African Highveld |
title_sort |
intra-pixel variability in satellite tropospheric no2 column densities derived from simultaneous space-borne and airborne observations over the south african highveld |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/amt-11-2797-2018 https://noa.gwlb.de/receive/cop_mods_00006134 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006091/amt-11-2797-2018.pdf https://amt.copernicus.org/articles/11/2797/2018/amt-11-2797-2018.pdf |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_relation |
Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-11-2797-2018 https://noa.gwlb.de/receive/cop_mods_00006134 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006091/amt-11-2797-2018.pdf https://amt.copernicus.org/articles/11/2797/2018/amt-11-2797-2018.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/amt-11-2797-2018 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
11 |
container_issue |
5 |
container_start_page |
2797 |
op_container_end_page |
2819 |
_version_ |
1765998659683483648 |