Research Data supporting "A new interpretative framework for below-cloud effects on stable water isotopes in vapour and rain"
dc.contributor.author
Graf, Pascal
dc.contributor.author
Bertolini, Patrick
dc.contributor.author
Aemisegger, Franziska
dc.contributor.author
Wernli, Heini
dc.contributor.contactPerson
Graf, Pascal
dc.contributor.contactPerson
Sodemann, Harald
dc.contributor.dataCollector
Graf, Pascal
dc.contributor.dataCollector
Bertolini, Patrick
dc.contributor.producer
Graf, Pascal
dc.contributor.projectLeader
Wernli, Heini
dc.contributor.projectManager
Graf, Pascal
dc.contributor.projectMember
Wernli, Heini
dc.contributor.projectMember
Sodemann, Harald
dc.contributor.researcher
Graf, Pascal
dc.contributor.researchGroup
Wernli, Heini
dc.date.accessioned
2018-06-25T06:41:40Z
dc.date.available
2018-06-22T12:36:12Z
dc.date.available
2018-06-22T14:08:57Z
dc.date.available
2018-06-25T06:41:40Z
dc.date.created
2017-11-13
en_US
dc.date.issued
2018
dc.identifier.uri
http://hdl.handle.net/20.500.11850/271617
dc.identifier.doi
10.3929/ethz-b-000271617
dc.description.abstract
Abstract. Raindrops interact with water vapour in ambient air while sedimenting from the cloud base to the ground. They constantly exchange water molecules with the environment and, in sub-saturated air, they evaporate partially or entirely. The latter of these below-cloud processes is important for predicting the resulting surface rainfall amount and it influences the boundary layer profiles of temperature and moisture through to evaporative latent cooling and humidity changes. However, despite its importance, it is very difficult to quantify this process from observations. Stable water isotopes provide such information, as they are influenced by both rain evaporation and equilibration. This study elucidates this option by introducing a novel interpretation framework for stable water isotope measurements performed simultaneously at high temporal resolution in both near-surface vapour and rain. We refer to this viewing device as the ∆δ∆d-diagram, which shows the isotopic composition (δ2H, d-excess) of equilibrium vapour from precipitation samples relative to the ambient vapour. It is shown that this diagram facilitates the diagnosis of below-cloud processes and their effects on the isotopic composition of vapour and rain since equilibration and evaporation lead to different pathways in the two-dimensional phase space of the ∆δ∆d-diagram. For a specific cold front in Central Europe, the analysis shows that below-cloud processes lead to distinct and temporally variable imprints on the isotope signal in surface rain. The influence of evaporation on this signal is particularly strong during periods with a weak precipitation rate. After the frontal passage, the near-surface atmospheric layer is characterised by higher relative humidity and a lower melting layer, leading to weaker below-cloud evaporation and equilibration. Measurements from four cold frontal events reveal a surprisingly similar slope of ∆d/∆δ = −0.30 in the phase space, indicating a potentially characteristic signature of below-cloud processes for this type of rain events.
en_US
dc.format
application/zip
en_US
dc.format
text/plain
en_US
dc.language.iso
en
en_US
dc.publisher
ETH Zurich
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Stable water isotopes
en_US
dc.subject
below-cloud processes
en_US
dc.subject
precipitation evaporation
en_US
dc.subject
atmospheric dynamics
en_US
dc.subject
Water cycle
en_US
dc.subject
Precipitations (Meteorology)
en_US
dc.subject
Cold fronts (Meteorology)
en_US
dc.title
Research Data supporting "A new interpretative framework for below-cloud effects on stable water isotopes in vapour and rain"
en_US
dc.type
Dataset
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.size
0.855 MB
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ethz.date.collected
2015-10-09/2015-11-27
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8.5485
ethz.geolocation.pointlat
47.3795
ethz.geolocation.placename
CHN, Zürich
ethz.publication.place
Zurich
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
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ethz.tag
DACH
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ethz.date.retentionend
indefinite
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ethz.date.retentionendDate
n/a
ethz.relation.isSupplementTo
10.5194/acp-2018-482
ethz.relation.isSupplementTo
10.3929/ethz-b-000322296
ethz.date.deposited
2018-06-22T12:36:13Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-06-25T06:41:48Z
ethz.rosetta.lastUpdated
2019-01-02T13:16:31Z
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true
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