Gutenberg Open Science: Ice supersaturated regions : properties and validation of ERA-Interim reanalysis with IAGOS in situ water vapour measurements

Please use this identifier to cite or link to this item: http://doi.org/10.25358/openscience-5603

Full metadata record

DC Field	Value	Language
dc.contributor.author	Reutter, Philipp	-
dc.contributor.author	Neis, Patrick	-
dc.contributor.author	Rohs, Susanne	-
dc.contributor.author	Sauvage, Bastien	-
dc.date.accessioned	2021-01-28T10:18:07Z	-
dc.date.available	2021-01-28T10:18:07Z	-
dc.date.issued	2020	-
dc.identifier.uri	https://openscience.ub.uni-mainz.de/handle/20.500.12030/5607	-
dc.description.abstract	Cirrus clouds and their potential formation regions, so-called ice supersaturated regions (ISSRs), with values of relative humidity with respect to ice exceeding 100 %, occur frequently in the tropopause region. It is assumed that ISSRs and cirrus clouds can change the tropopause structure by diabatic processes, driven by latent heating due to phase transition and interaction with radiation. For many research questions, a three-dimensional picture including a sufficient temporal resolution of the water vapour fields in the tropopause region is required. This requirement is fulfilled nowadays by reanalysis products such as the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-Interim reanalysis. However, for a meaningful investigation of water vapour in the tropopause region, a comparison of the reanalysis data with measurement is advisable, since it is difficult to measure water vapour and to assimilate meaningful measurements into reanalysis products. Here, we present an intercomparison of high-resolution in situ measurements aboard passenger aircraft within the European Research Infrastructure IAGOS (In-service Aircraft for a Global Observing System; http://www.iagos.org, last access: 15 January 2020) with ERA-Interim. Temperature and humidity data over the North Atlantic from 2000 to 2009 are compared relative to the dynamical tropopause. The comparison of the temperature shows good agreement between the measurement and ERA-Interim. While ERA-Interim also shows the main features of the water vapour measurements of IAGOS, the variability of the data is clearly smaller in the reanalysis data set. The combination of temperature and water vapour leads to the relative humidity with respect to ice (RHi). Here, ERA-Interim deviates from the measurements concerning values larger than RHi=100 %, both in number and strength of supersaturation. Also, pathlengths of ISSRs along flight tracks are investigated, representing macrophysical properties as linked to atmospheric flows. The comparison of ISSR pathlengths shows distinct differences, which can be traced back to the spatial resolution of both data sets. Also, the seasonal cycle and height dependence of pathlengths changes for the different data sets due to their spatial resolution. IAGOS shows a significantly greater amount of smaller ISSRs compared to ERA-Interim. Good agreement begins only at pathlengths on the order of the ERA-Interim spatial resolution and larger.	en_GB
dc.description.sponsorship	DFG, Open Access-Publizieren Universität Mainz / Universitätsmedizin Mainz	de
dc.language.iso	eng	de
dc.rights	CC BY	*
dc.rights.uri	https://creativecommons.org/licenses/by/4.0/	*
dc.subject.ddc	530 Physik	de_DE
dc.subject.ddc	530 Physics	en_GB
dc.title	Ice supersaturated regions : properties and validation of ERA-Interim reanalysis with IAGOS in situ water vapour measurements	en_GB
dc.type	Zeitschriftenaufsatz	de
dc.identifier.doi	http://doi.org/10.25358/openscience-5603	-
jgu.type.dinitype	article	en_GB
jgu.type.version	Published version	de
jgu.type.resource	Text	de
jgu.organisation.department	FB 08 Physik, Mathematik u. Informatik	de
jgu.organisation.number	7940	-
jgu.organisation.name	Johannes Gutenberg-Universität Mainz	-
jgu.rights.accessrights	openAccess	-
jgu.journal.title	Atmospheric chemistry and physics	de
jgu.journal.volume	20	de
jgu.journal.issue	2	de
jgu.pages.start	787	de
jgu.pages.end	804	de
jgu.publisher.year	2020	-
jgu.publisher.name	EGU	de
jgu.publisher.place	Katlenburg-Lindau	de
jgu.publisher.uri	https://doi.org/10.5194/acp-20-787-2020	de
jgu.publisher.issn	1680-7324	de
jgu.organisation.place	Mainz	-
jgu.subject.ddccode	530	de
jgu.publisher.doi	10.5194/acp-20-787-2020
jgu.organisation.ror	https://ror.org/023b0x485
Appears in collections:	JGU-Publikationen

Files in This Item:

	File	Description	Size	Format
	reutter_philipp-ice_supersatur-20210128094910350.pdf		3.38 MB	Adobe PDF	View/Open

Show simple item record