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Intra-pixel variability in satellite NO2 measurements

Broccardo, Stephen and Heue, Klaus-Peter and Walter, David and Meyer, Christian and Kokhanovsky, Alexander and van der A, Ronald and Langermann, Kristy and Piketh, Stuart and Platt, Ulrich (2018) Intra-pixel variability in satellite NO2 measurements. Atmospheric Measurement Techniques (AMT). Copernicus Publications. ISSN 1867-1381 (In Press)

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Abstract

Aircraft measurements of NO2 using a differential optical absorption spectrometer (DOAS) instrument over the South African Highveld region in August 2007 are presented. In-situ aerosol and trace-gas vertical profile measurements, along with aerosol optical thickness and single-scattering albedo from AERONET, are used to devise scenarios for a radiative-transfer modelling sensitivity study. Uncertainty in the air-mass factor due to variations in profile shape is constrained, and used to calculate vertical column densities, 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 VCD. Spatially-averaged aircraft measurements close to major sources 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. Despite the low resolution, satellite images reveal point sources and plumes that retain their structure for several hundred kilometers downwind.

Item URL in elib:https://elib.dlr.de/108297/
Document Type:Article
Title:Intra-pixel variability in satellite NO2 measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Broccardo, StephenUnit for Environmental Science and Management, North-West University, PotchefstroomUNSPECIFIED
Heue, Klaus-PeterKlaus-Peter.Heue (at) dlr.dehttps://orcid.org/0000-0001-8823-7712
Walter, DavidMax-Planck-Institut für Chemie MainzUNSPECIFIED
Meyer, ChristianZentrum Mikroelektronik Dresden AGUNSPECIFIED
Kokhanovsky, AlexanderEUMETSATUNSPECIFIED
van der A, RonaldknmiUNSPECIFIED
Langermann, KristyEskom Holdings SOC LtdUNSPECIFIED
Piketh, StuartClimatology Research Group, North-West University, PotchefstroomUNSPECIFIED
Platt, Ulrichiup univ., heidelbergUNSPECIFIED
Date:2018
Journal or Publication Title:Atmospheric Measurement Techniques (AMT)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:Copernicus Publications
ISSN:1867-1381
Status:In Press
Keywords:Emissionen von Kohlekraftwerken, NO NO2 NOx Vergleich Flugzeugmessungen mit Satelliten
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: Heue, Klaus-Peter
Deposited On:24 Nov 2016 12:12
Last Modified:08 Mar 2018 18:10

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