aktualisiertes pdf - DPG-Tagungen

UP 12.7 Di 14:00 Schellingstr. 3
Water Vapour Column Retrieval from SCIAMACHY —
•Stefan Noël, Michael Buchwitz, John P. Burrows, and
Kai-Uwe Eichmann — Institute of Environmental Physics/Remote
Sensing, University of Bremen, Germany
Global water vapour column amounts have been derived from measurements
of the SCanning Imaging Absorption spectroMeter for Atmospheric
CHartographY (SCIAMACHY) on the European environmental
satellite ENVISAT. For this purpose, the Air Mass Corrected Differential
Absorption Spectroscopy (AMC-DOAS) approach, which was originally
designed for GOME, has been applied to SCIAMACHY’s nadir measurements
in the near-visible spectral region around 700 nm. The resulting
SCIAMACHY total water vapour columns are compared with corresponding
SSM/I and ECMWF water vapour data. Taking into account
a systematic offset of about 10%, which may be related to the presence
of clouds, the SCIAMACHY water vapour results agree well with these
correlative data not only over ocean but also over land, thus showing the
capability of SCIAMACHY to derive water vapour concentrations on the
global scale.
UP 12.8 Di 14:00 Schellingstr. 3
First near global measurements of stratospheric BrO and
comparison with model results — •NINAD SHEODE 1 ,
BJOERN-MARTIN SINNHUBER 2 , ALEXEJ ROZANOV 3 ,
and JOHN BURROWS 4 — 1 nsheode@iup.physik.uni-bremen.de —
2 bms@iup.physik.uni-bremen.de — 3 alexej@iup.physik.uni-bremen.de
— 4 burrows@iup.physik.uni-bremen.de
Bromine species play an important role in the stratospheric ozone depletion,
both at high latitudes and at mid-latitudes. However, inspite
of its importance, there exist only very few measurements of bromine
species in the stratosphere so far. Here we present the first near-global
measurements of stratospheric bromine monoxide (BrO) from the SCIA-
MACHY instrument on board the ENVISAT satellite. The measurements
are compared with calculations from a chemical model in order to test
our current understanding of the stratospheric bromine chemistry.
UP 12.9 Di 14:00 Schellingstr. 3
Occultation Measurements with SCIAMACHY: First Results
and Validation — •Leonard Amekudzi, Bettina Hoffmann, Jerome
Meyer, Alexei Rozanov, Heinrich Bovensmann und John
P. Burrows — Institut für Umweltphysik - Universität Bremen
UP 13 Poster: Aerosol und Mensch
SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric
CHartographY) has successfully been launched onboard ENVI-
SAT (ENVIronmental SATellite) in March 2002. It measures scattered,
reflected, and direct radiation in the UV-Vis-IR range in three different
viewing geometries (nadir, limb, and solar/lunar occultation). The focus
of this presentation is on first solar and lunar occultation results.
Height resolved concentration profiles of O3 and NO2 are derived from
the occultation data as a standard product. First validations for these
species have been carried out successfully. Furthermore, first vertical
concentration profiles of NO3 have been retrieved from lunar occultation
measurements and will be presented. The retrieval algorithm is based on
the optimal estimation method. It is specialised on the spectral fitting of
differential structures of radiation transmitted through the atmosphere.
UP 12.10 Di 14:00 Schellingstr. 3
Cloud effects in SCIAMACHY tropospheric NO2 — •Andreas
Richter, Hendrik Nüß, Bernd Sierk, and John P. Burrows
— Institut für Umweltphysik, Universität Bremen, Otto-Hahn-Allee, D-
28359 Bremen
The SCIAMACHY instrument on ENVISAT provides amongst other
quantities accurate nadir measurements of the UV/visible radiances scattered
back from the atmosphere. From these measurements, tropospheric
columns of NO2 can be retrieved using the well known DOAS method
and some assumptions on the stratospheric NO2 fields.
Most of the tropospheric NO2 is located close to the surface as - with
the exception of lightning - the sources are at the ground and the lifetime
of NO2 is short. Thus, one would expect to see a clear reduction in tropospheric
NO2 signal in the presence of clouds, and in fact this is observed
in many cases. However, there are also numerous situations where large
signals are observed over cloud covered pixels, often linked to weather
fronts and transport events.
In this study, the effects of clouds on tropospheric NO2 columns derived
from SCIAMACHY measurements are evaluated and possible explanations
discussed. In addition, measurements form the GOME instrument
on ERS-2 are used to check if the findings are consistent with those from
the long GOME time series available, and in howfar they depend on the
size of the ground-pixels of the measurements.
Zeit: Dienstag 14:00–16:00 Raum: Schellingstr. 3
UP 13.1 Di 14:00 Schellingstr. 3
Mass Spectrometric Aerosol Composition Measurements in
the Free Troposphere — •Johannes Schneider 1 , Joachim Curtius
2 , Frank Drewnick 1 , Silke Henseler 1 , Nele Hock 1 , Silke
Weimer 1 , and Stephan Borrmann 1,2 — 1 Abt. Wolkenphysik und -
chemie, Max-Planck-Institut für Chemie, Mainz — 2 Institut für Physik
der Atmosphäre, Johannes Gutenberg-Universität Mainz
Aircraft based measurements of the chemical composition of aerosol
particles in the mid-latitude tropopause region have been performed using
the Aerodyne Aerosol Mass Spectrometer (AMS). The AMS detects
particles in the size range between 50 and 1500 nm and measures quantitatively
the mass concentrations and size distributions of ammonium,
nitrate, sulfate, and organics. The aircraft measurements were part of
the research project PAZI (Particles From Aircraft: Impact on Cirrus
Clouds and Climate), which is funded by the German HGF (Hermann
von Helmholtz-Gemeinschaft Deutscher Forschungszentren) research organization.
The main objective of this project is to investigate the relationship
between aircraft exhaust particles and the formation of cirrus
clouds. The measurements took place in Southern Germany using the
twin-jet research aircraft ”Falcon” of the DLR (Deutsches Zentrum fuer
Luft- und Raumfahrt). The measurement flights included sampling in
aged aircraft exhaust as well as background flights in regions with little
air traffic, at altitudes between 8000 and 12000 m, representing the
mid-latitude upper troposphere. Here we present first results like size
distributions and vertical profiles.
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UP 13.2 Di 14:00 Schellingstr. 3
Sedimentationsgeschwindigkeit realer Staubpartikel —
•Gregor Schmitt 1,2 , Oliver Wallenfang 2 , Bernd Diekmann 1
und Wolfgang Büscher 2 — 1 Universität Bonn, Physikalisches
Institut, Nußallee 12, 53115 Bonn — 2 Universität Bonn, Institut für
Landtechnik, Nußallee 5, 53115 Bonn
In der Tierhaltung treten nicht zu unterschätzende Bioaerosolkonzentrationen
(Staub und Mikroorganismen) auf, deren Auswirkungen auf
Mensch und Tier bislang nur in Ansätzen untersucht worden sind. Daher
stellen sich vermehrt Fragen bezüglich der Ausbreitung von Bioaerosolen.
Am Institut für Landtechnik der Universität Bonn wird ein computergestütztes
Modell zur Ausbreitungsberechnung von Partikeln erstellt.
Staubspezifische Eigenschaften wie z.B. die Sedimentationsgeschwindigkeit
werden in der Regel in Modellen auf Partikel einer definierten Dichte
eingegrenzt. Untersuchungen am Institut für Landtechnik haben gezeigt,
dass die Staubzusammensetzung bei einer Tierart in verschiedenen Haltungsformen
bereits so stark differiert, dass eine Einteilung der Partikel
in verschiedene Größenfraktionen notwendig ist, um eine korrekte Modellierung
der Staubausbreitung vornehmen zu können. In dieser Posterpräsentation
wird eine Methode zur empirischen Bestimmung der Sedimentationsgeschwindigkeit
sowie die Berechnung der Dichte und Masse
von Partikeln vorgestellt und diskutiert. Das Poster ergänzt den Hauptvortrag
”Modellierung und Detektion von Geruch und Staub” von O.
Wallenfang.