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Aircraft-based in situ measurements of CH4 and CO2 downstream of European and Asian urban centres at local to synoptic scales

Klausner, Theresa (2020) Aircraft-based in situ measurements of CH4 and CO2 downstream of European and Asian urban centres at local to synoptic scales. DLR-Forschungsbericht. DLR-FB-2020-30. Dissertation. Ludwig-Maximilians-Universität München. doi: 10.5282/edoc.26983.

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Official URL: https://edoc.ub.uni-muenchen.de/26983/

Abstract

In urban areas large amounts of carbon dioxide (CO2) and methane (CH4), the two most important anthropogenic greenhouse gases (GHG), are released. The contribution of individual sources and their spatial distribution are still unknown but need to be better understood in order to reliably predict future climate impacts. In this thesis high-accuracy airborne in situ measurements, using cavity ring-down spectroscopy, were carried out to analyse the impact of urban CO2 and CH4 emissions on the local to synoptic scale GHG distribution. The focus is on the German capital Berlin and on megacities in Europe and Asia. Based on the local case study, the GHG plume from Berlin was detected above the atmospheric background and the estimated top-down emission rates, using a mass balance method, were used to validate bottom-up emissions and to reveal missing sources in inventories. On the synoptic scale, European and Asian urban GHG signatures could be identified despite the larger sampling distance from the cities and thus the increased inmixing of background air. The origin of urban air masses was verified by numerical model simulations and simultaneous measurements of short-lived species.

Item URL in elib:https://elib.dlr.de/138103/
Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Title:Aircraft-based in situ measurements of CH4 and CO2 downstream of European and Asian urban centres at local to synoptic scales
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Klausner, TheresaDLR, IPAhttps://orcid.org/0000-0002-1792-6649UNSPECIFIED
Date:13 November 2020
Refereed publication:No
Open Access:Yes
DOI:10.5282/edoc.26983
ISSN:1434-8454
Status:Published
Keywords:methane, carbon dioxide, urban greenhouse gases, cavity ring-down spectroscopy
Institution:Ludwig-Maximilians-Universität München
Department:Fakultät für Physik
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Harlass, Theresa
Deposited On:25 Nov 2020 07:55
Last Modified:25 Nov 2020 07:55

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