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The millennium water vapour drop in the stratosphere in chemistry-climate model simulations

Brinkop, Sabine and Dameris, Martin and Jöckel, Patrick and Garny, Hella and Lossow, Stefan and Stiller, Gabriele (2015) The millennium water vapour drop in the stratosphere in chemistry-climate model simulations. CFCC (Our common future under climate change), 7.-10. Jul. 2015, Paris, Frankreich.

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This study investigates the millennium water vapour drop, the abrupt and severe water vapour decline in thestratosphere beginning in year 2000, by means of various simulations using the Chemistry-Climate Model (CCM)EMAC. Since the beginning 1980s, balloon borne stratospheric water vapour measurements and correspondingsatellite measurements starting in the early 1990s indicated a long-term steady increase of water vapour concentrations.However, the multi-year data sets also show significant fluctuations on different time scales. In theyear 2000, an extraordinary sudden drop of stratospheric water vapour concentration has been observed followedby persistent low values for several years. Solomon et al. (2010) showed that this drop slowed down the rate ofincrease in global surface temperature over the following decade by about 25%. So far, the stratospheric watervapour variations observed by satellite from 1992 to 2012 are not reproduced by CCM simulations forced byobserved changes in sea surface temperatures, greenhouse gases and ozone-depleting substances (Gettelman et al.,2010, Randel and Jensen, 2013).However, the CCM EMAC is able to reproduce the signature and pattern of the water vapour disturbances inagreement with those derived from observations. In this paper we present results of a hierarchy of simulationswith the CCM EMAC, demonstrating that it is possible to retrace the observed water vapour fluctuations in thestratosphere (incl. the millennium drop), if suitable inner and outer boundary conditions are applied.

Item URL in elib:https://elib.dlr.de/97854/
Document Type:Conference or Workshop Item (Speech)
Title:The millennium water vapour drop in the stratosphere in chemistry-climate model simulations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:July 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Klimawandel, strahlungsaktive Gase, natürliche Schwankungen
Event Title:CFCC (Our common future under climate change)
Event Location:Paris, Frankreich
Event Type:international Conference
Event Dates:7.-10. Jul. 2015
Organizer:CNRS Paris, Frankreich
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
Deposited By: Dameris, Prof. Dr. rer. nat. Martin
Deposited On:17 Aug 2015 17:44
Last Modified:17 Aug 2015 17:44

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