aktualisiertes pdf - DPG-Tagungen

and require precise measurements with multiple tracers. UV-spectroscopy
is introduced as a new technique for direct and fast measurements of
multiple tracer concentrations both in the water and the atmosphere.
Volatile aromatic hydrocarbons such as benzene, thiophene, pyridine and
derivates and some other species can be measured. The new technique is
attractive for two reasons: a) concentrations of volatile species dissolved
in water can be measured directly in the water without the need for ex-
UP 16 Poster: Atmosphäre
traction and b) tracers with a wide range of physicochemical parameters,
i.e. Schmidt number and solubility can be measured simultaneously so
that a detailed experimental study of the influence of these parameters
on air-water gas exchange becomes feasible. The experimental set up and
analysis of the spectral data are described. First results from experiments
in a 120cm diameter circular wind-wave-facility in Heidelberg show the
significant potentiality of the new technique.
Zeit: Dienstag 14:00–16:00 Raum: Schellingstr. 3
UP 16.1 Di 14:00 Schellingstr. 3
Advection, diffusion and reaction of pollutants in a two dimensional
flow — •G. Bene 1 and H. Lustfeld 2 — 1 Institute for Theoretical
Physics, Eötvös University, Pázmány Péter sétány 1/A, H-1117
Budapest, Hungary, e-mail: bene@arpad.elte.hu — 2 Forschungszentrum
Jülich, IFF, 52425 Jülich, e-mail: h.lustfeld@fz-juelich.de
Advection, diffusion and reaction of pollutants in a two dimensional
flow is studied. Two separate but related methods are considered:
1) Effective diffusion and reaction rates based on a special (exact) solution
are calculated and extended to the general case. We present results
for the concentration distribution, the effective diffusion and effective reaction
rates.
2) In experimental situations the detailed structure of the concentration
field is mostly not available, only a locally averaged concentration field ¯c
is given. We derive an equation for ¯c directly. This approach is generalized
for calculating effective reaction rates between two pollutants.
UP 16.2 Di 14:00 Schellingstr. 3
Measurement of CO, NO, NO2, Organic Compounds and
PM10 at a Motorway Location in an Austrian Valley during
a Twelve Hour Blockade Period — •Jonathan Beauchamp 1 ,
Armin Wisthaler 1 , Wolfgang Grabmer 1 , Christian Neuner 2 ,
Andreas Weber 2 , and Armin Hansel 1 — 1 Institut fuer Ionenphysik,
Universitaet Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
— 2 Landesforstdirektion Waldschutz/Luftguete, Amt der Tiroler
Landesregierung, Buergerstr. 36, A-6020 Innsbruck, Austria
UP 17 Poster: Atmosphäre und Messtechnik
In-situ measurements of key chemical compounds took place over an
eleven day period encompassing a twelve hour motorway blockade (25th
October 2002, 12:00 noon to 24:00 midnight). Located within the Inn
valley (Tirol, Austria), the monitoring site has restricted dilution conditions
for air pollutants and high traffic sources. Continuous levels of CO,
NO, NO2 and certain organic compounds were monitored and detection
of PM10 was carried out. The period of traffic absence showed a dramatic
decrease of NO. PM10, as well as the aromatics, showed a corresponding
but slower decrease throughout this period.
Analysis of data separated into weekdays and weekends showed significant
reductions of NOx and PM10 at the weekend, when fewer heavy
duty vehicles (HDV) use the motorway, implicating HDV as the dominant
source of these two pollutants. Principal components analyses for
the separated data further support this.
Finally, our data clearly restate the dominating meteorological influence
which cause severely restricted dispersion conditions for air pollutants
in Alpine valleys.
Zeit: Dienstag 14:00–16:00 Raum: Schellingstr. 3
UP 17.1 Di 14:00 Schellingstr. 3
HOx-Radikalkonzentrationen während der ECHO Feldmesskampagne
im Sommer 2003 — •Manfred Siese 1 , Lutz Rupp 1 ,
Andreas Hofzumahaus 1 , Jörg Kleffmann 2 , Djuro Mihelcic 1 ,
Frank Holland 1 und Eric Schlosser 1 — 1 Institut für Chemie
und Dynamik der Geosphäre II: Troposphäre, Forschungszentrum
Jülich, Leo Brandt Strasse, 52425 Jülich — 2 Bergische Universität
Gesamthochschule Wuppertal, Fachbereich 9, Physikalische Chemie,
Gaußstr. 20, 42097 Wuppertal
Mittels laser-induzierter Fluoreszenz (LIF) wurden im Sommer 2003
im Rahmen des ECHO-Projektes in einem Mischwaldbestand OH−
und HO2-Radikalkonzentrationen gemessen. Es wurde ein neues LIF-
Instrument eingesetzt, welches kompakt und leicht genug war, um auf
einer fahrbaren Plattform entlang eines 36 m hohen Turmes im Wald
eingesetzt werden zu können. So konnten die HOx-Konzentrationen auf
verschiedenen Höhen im und oberhalb des Waldbestandes bestimmt werden.
Erstmals konnten bei dieser Kampagne vertikale Konzentrationsgradienten
der HOx-Radikale zwischen 2 m bis 38 m gemessen werden. Es
wurden mehrere HOx-Tagesgänge sowohl am Waldboden, als auch innerhalb
und oberhalb des Kronenraumes aufgenommen. Dabei konnten OH
und HO2-Radikale auch in der Nacht nachgewiesen werden.
Die HO2-Radikalkonzentrationen wurden gleichzeitig mit Hilfe der
Matrix-Isolation-Elektronen-Spin-Resonanz Technik (MIESR) bestimmt,
wobei sich eine sehr gute Übereinstimmung mit den Ergebnissen aus LIF-
Messungen ergab.
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UP 17.2 Di 14:00 Schellingstr. 3
Multi-axis DOAS observations of atmospheric trace gases at
the Greenland ice cap — •Thomas Medeke, Sixten Fietkau,
Annette Ladstaetter- Weissenmayer, Hilke Oetjen, Andreas
Richter, Folkard Wittrock, and John Burrows — University of
Bremen, IUP, Otto- Hahn- Allee 1, 28359 Bremen
In July 2003 a new MAX- DOAS instrument has been installed at
Summit (Greenland). MAX-DOAS is based on the well-known UV/VIS
instruments, which use the sunlight scattered in the zenith sky as the
light source and the method of Differential Optical Absorption Spectroscopy
(DOAS) to derive column amounts of absorbers like ozone and
nitrogen dioxide. Substantial enhancements have been applied to this
standard setup to use different line of sights near to the horizon as additional
light sources (MAX - multi axis). In addition, this measurement
technique can be used for both ground based observations (e.g. Network
for Detection of Stratospheric Change - NDSC) and validation of satellite
instruments (e.g. Global Ozone Monitoring Experiment - GOME,
Scanning Imaging Absorption Spectrometer for Atmospheric Chartography
- SCIAMACHY) which allows to combine highly time and spatial
resolved data of selected locations with data of global coverage. First results
from measurements at the Summit part of the BREDOM (Bremian
DOAS Network for Atmospheric Measurements) will be presented and interpreted
with the full-spherical radiation transport model SCIATRAN.