TY  - JOUR
A1  - Vogel, Bärbel
A1  - Müller, Rolf
A1  - Engel, Andreas
A1  - Grooß, Jens-Uwe
A1  - Toohey, Darin W.
A1  - Woyke, Thomas
A1  - Stroh, Fred
T1  - Midlatitude ClO during the maximum atmospheric chlorine burden : in situ balloon measurements and model simulations
T2  - Atmospheric chemistry and physics. Discussions
N2  - Chlorine monoxide (ClO) plays a key role in stratospheric ozone loss processes at midlatitudes. We present two balloonborne in situ measurements of ClO conducted in northern hemisphere midlatitudes during the period of the maximum of total inorganic chlorine loading in the atmosphere. Both ClO measurements were conducted on board the TRIPLE balloon payload, launched in November 1996 in Le´on, Spain, and in May 1999 in Aire sur l’Adour, France. For both flights a ClO daylight and night time vertical profile could be derived over an altitude range of approximately 15–31 km. ClO mixing ratios are compared to model simulations performed with the photochemical box model version of the Chemical Lagrangian Model of the Stratosphere (CLaMS). Simulations along 24-h backward trajectories were performed to study the diurnal variation of ClO in the midlatitude lower stratosphere. Model simulations for the flight launched in Aire sur l’Adour 1999 show a good agreement with the ClO measurements. For the flight launched in Le´on 1996, a similar good agreement is found, except at around ~ 650 K potential temperature (~26km altitude). However, a tendency is found that for solar zenith angles greater than 86°–87° the simulated ClO mixing ratios substantially overestimate measured ClO by approximately a factor of 2.5 or more for both flights. Therefore we conclude that no indication can be deduced from the presented ClO measurements that substantial uncertainties exist in midlatitude chlorine chemistry of the stratosphere. An exception is the situation at solar zenith angles greater than 86°–87° where model simulations substantial overestimate ClO observations.
Y1  - 2005
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3935
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-15599
UR  - http://www.atmos-chem-phys.org/acpd/5/875/
SN  - 1680-7375
SN  - 1680-7367
N1  - © 2005 Author(s). This work is licensed under a Creative Commons License.
N1  - Begutachteter Artikel erschienen in: Atmospheric chemistry and physics, 5.2005, Nr. 6, S. 1623-1638, doi:10.5194/acp-5-1623-2005
VL  - 5
SP  - 875
EP  - 909
PB  - EGU
CY  - Katlenburg-Lindau
ER  -