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dc.contributor.author
Hasebe, Fumio
dc.contributor.author
Inai, Y.
dc.contributor.author
Shiotani, Masato
dc.contributor.author
Fujiwara, Masatomo
dc.contributor.author
Vömel, Holger
dc.contributor.author
Nishi, N.
dc.contributor.author
Ogino, Shin-Ya
dc.contributor.author
Shibata, Takashi
dc.contributor.author
Iwasaki, S.
dc.contributor.author
Komala, N.
dc.contributor.author
Peter, Thomas
dc.contributor.author
Oltmans, Samuel J.
dc.date.accessioned
2018-11-06T13:49:41Z
dc.date.available
2017-06-10T17:57:30Z
dc.date.available
2018-11-06T13:49:41Z
dc.date.issued
2013
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-13-4393-2013
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/67923
dc.identifier.doi
10.3929/ethz-b-000067923
dc.description.abstract
A network of balloon-borne radiosonde observations employing chilled-mirror hygrometers for water and electrochemical concentration cells for ozone has been operated since the late 1990s in the Tropical Pacific to capture the evolution of dehydration of air parcels advected quasi-horizontally in the Tropical Tropopause Layer (TTL). The analysis of this dataset is made on isentropes taking advantage of the conservative properties of tracers moving adiabatically. The existence of ice particles is diagnosed by lidars simultaneously operated with sonde flights. Characteristics of the TTL dehydration are presented on the basis of individual soundings and statistical features. Supersaturations close to 80% in relative humidity with respect to ice (RHice) have been observed in subvisible cirrus clouds located near the cold point tropopause at extremely low temperatures around 180 K. Although further observational evidence is needed to confirm the credibility of such high values of RHice, the evolution of TTL dehydration is evident from the data in isentropic scatter plots between the sonde-observed mixing ratio (OMR) and the minimum saturation mixing ratio (SMRmin) along the back trajectories associated with the observed air mass. Supersaturation exceeding the critical value of homogeneous ice nucleation (OMR > 1.6 × SMRmin) is frequently observed on the 360 and 365 K surfaces indicating that cold trap dehydration is in progress in the TTL. The near correspondence between the two (OMR ~ SMRmin) at 380 K on the other hand implies that this surface is not sufficiently cold for the advected air parcels to be dehydrated. Above 380 K, cold trap dehydration would scarcely function while some moistening occurs before the air parcels reach the lowermost stratosphere at around 400 K where OMR is generally smaller than SMRmin.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Cold trap dehydration in the Tropical Tropopause Layer characterised by SOWER chilled-mirror hygrometer network data in the Tropical Pacific
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2013-04-26
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
13
en_US
ethz.journal.issue
8
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
4393
en_US
ethz.pages.end
4411
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
004294181
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
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::03517 - Peter, Thomas / Peter, Thomas
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::03517 - Peter, Thomas / Peter, Thomas
ethz.date.deposited
2017-06-10T17:59:30Z
ethz.source
ECIT
ethz.identifier.importid
imp593650aeae50c65813
ethz.ecitpid
pub:108001
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-13T10:03:49Z
ethz.rosetta.lastUpdated
2020-02-15T15:49:24Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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