aktualisiertes pdf - DPG-Tagungen

UP 17.3 Di 14:00 Schellingstr. 3
On-line monitoring of VOCs at a high mountain site in the German
Alps (Schneefernerhaus, Zugspitze) — •Gregor Simmer 1 ,
Wolfgang Gramber 1 , Armin Wisthaler 1 , Martin Graus 1 , Ulrich
Poeschl 2 , and Armin Hansel 1 — 1 Institute of Ion Physics,
University of Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria —
2 Institute of Hydrochemistry, Technical University of Munich, Marchioninstr.
17, D-81377 Munich, Germany
In the frame of the Schneefernerhaus Aerosol and Reactive Nitrogen
Experiment (SCAVEX) a Proton-Transfer-Reaction Mass Spectrometer
was installed on the Environmental Research Station Schneefernerhaus
(2650 m a.s.l.). The Schneefernerhaus is situated about 300 m below
the peak of the Zugspitze in the German Alps. From 28th October 2002
till 12th March 2003 the remotely operated PTR-MS instrument measured
a series of volatile organic compounds (VOCs) including oxygenates
(methanol, acetaldehyde, acetone, methyl ethyl ketone), aromatics (benzene,
toluene, alkyl substituted benzenes) and the biomass burning tracer
acetonitrile. PTR-MS measurements on high mountain sites can be used
to identify air masses with very different chemical characteristics, which
have originated in the planetary boundary layer or have undergone longrange
transport in the free troposphere. First results will be presented.
UP 17.4 Di 14:00 Schellingstr. 3
AMAXDOAS TROPOSPHERIC NO2 MEASUREMENT ON
FALCON — •Ping Wang 1 , Marco Bruns 1 , Andreas Richter 1 ,
John P. Burrows 1 , Klaus-Peter Heue 2 , Irene Pundt 2 ,
Thomas Wagner 2 , and Ulrich Platt 2 — 1 Institute of Environmental
Physics, University of Bremen, Otto-Hahn-Allee 1, D-28359 Bremen,
Germany — 2 Institute of Environmental Physics, University of Heidelberg,
In Neuenheimer Feld 229, 69120 Heidelberg, Germany
The AMAXDOAS instrument on the DLR Falcon participated in the
SCIAVAL campaign in September 2002 and February, March 2003. The
AMAXDOAS instrument is a UV/visible spectrometer observing scattered
light in four different directions: zenith, nadir, zenith off-axis and
nadir off-axis. From the spectra, columns can be retrieved for several trace
gases including BrO, OClO, NO2, and O3 using the well known DOAS
(Differential Optical Absorption Spectroscopy) method. Large NO2 column
enhancements are measured in nadir direction over Europe during
some flights in 2002 and 2003. In this presentation we will describe the
instrument and data analysis briefly. The NO2 slant columns are interpreted
using fitting windows at different wavelengths and different viewing
directions. Tropospheric NO2 AMFs are calculated with the radiative
transport model SCIATRAN. Tropospheric NO2 vertical columns
derived from the difference of zenith and nadir measurements will be
presented and compared to measurements from the GOME and SCIA-
MACHY satellite instruments.
UP 17.5 Di 14:00 Schellingstr. 3
Formaldehyde and other trace gases retrieved by MAX-DOAS
— •Tiberiu Tarsu, Andreas Heckel, Andreas Richter,
Folkard Wittrock, and John Burrows — Otto-Hahn-Allee 1,
Universitaet Bremen, D-28359 Bremen
The FORMAT (Formaldehyde as a tracer of oxidation in the troposphere)
project represented an opportunity for the newly-developed concept
of Multi Axis DOAS (MAX-DOAS) to determine volume mixing
ratios in the lower troposphere. Tropospheric levels of several trace gases
(HCHO, NO2 and O4) were investigated in the near-UV spectral region,
employing zenith observations and four off-axis elevation angles close to
the horizon. Atmospheric measurements were performed during two campaigns
(summer 2002 and fall 2003) in the Po Valley (Northern Italy),
a highly polluted, densely populated region, typical for midlatitudes ur-
UP 18 Poster: Aerosol und Messtechnik
ban areas. The results show that significant levels of HCHO and NO2
were present during the campaigns despite unusual weather conditions:
holiday time (in 2002) and showers which prevented the accumulation of
high atmospheric concentrations during both periods. For the days with
clear sky conditions, slant columns of good quality can be retrieved. In
order to calculate vertical columns realistic air mass factors have to be
computed. Their quality is verified by comparing O4 columns for different
elevation angles. Results indicate the presence of HCHO in the whole
area, providing a picture of the horizontal and temporal distribution.
UP 17.6 Di 14:00 Schellingstr. 3
Simulation of a Direct Detection Doppler Wind LIDAR for the
ADM — •Ulrike Paffrath 1 , Ines Leike 2 , Oliver Reitebuch 1
und Juergen Streicher 1 — 1 DLR 82230 Wessling — 2 Physiks Solutions
Woertherstr. 2a 85457 Woerth
The ” Atmospheric Dynamic Mission” ADM by ESA (European Space
Agency) is the first mission worldwide to provide global atmospheric wind
profiles by applying a Doppler wind LIDAR (Light Detection And Ranging)
at a wavelength of 355 nm. This unit will be evaluated as an airborne
system by DLR and it is essential to validate the complete system
beforehand by a simulator.
The transmitter is a pulsed, tripled Nd:YAG laser with a pulse repetition
rate of 100 Hz. The receiver unit includes a detector for the Mie
aerosol backscatter with a multi channel Fizeau interferometer and one
for the Rayleigh molecular backscatter with a double edge Fabry Perot
interferometer.
Simulations of Doppler wind LIDAR will address the assessment of
different instrument parameters, the impact of wind and atmospheric
structures, the improvement of the data processing algorithms, the correlations
between aerosol respectively molecular backscatter and atmospheric
dynamics, cloud properties and calibration and monitoring using
natural targets. All of these factors must be taken into account when
predicting the performance of a Doppler wind LIDAR using a simulator
and ultimately the impact of the measurements on climate studies and
numerical weather prediction
UP 17.7 Di 14:00 Schellingstr. 3
Airborne microwave observations of stratospheric trace gases
during SCIAMACHY validation campaigns — •Jayanarayanan
Kuttippurath, Holger Bremer, Armin Kleinboehl, Harry
Kuellmann, and Klaus Kuenzi — Institute of Environmental
Physics, University of Bremen
The Airborne Submillimeter Radiometer is a heterodyne sensor. It operates
in a tuning frequency range of 604 GHz to 662 GHz and is equipped
with two spectrometers namely, AOS and CTS. The AOS has a total
bandwidth of 1.5 GHz, a resolution of 1.5 MHz and is used for probing
stratospheric constituents. The sensor is operated onboard a high altitude
research aircraft at an altitude of about 10-13 km in order to avoid
signal absorption due to tropospheric water vapour. The sensor looks
upward at a zenith angle of 78 deg., detects the thermal emissions from
the rotational lines of various molecules. From the pressure broadening
of the detected thermal lines, vertical profiles of volume mixing ratio are
retrieved employing the Optimal Estimation Method. ASUR measures a
range of stratospheric molecules like, Ozone, ClO, HCl, HNO3, N2O, etc.
SCIA-VALUE 2002-03 is the validation campaigns performed onboard
the DLR Falcon to validate SCIAMACHY data, which is a sensor onboard
ESA’s ENVISAT satellite. A latitude band spanned from the Arctic
to tropics was covered during the campaign in two different seasons.
In this presentation, an overview of the ASUR sensor, the campaign,
the data set gathered and the first attempts for the validation of SCIA-
MACHY data will be presented.
Zeit: Dienstag 14:00–16:00 Raum: Schellingstr. 3
UP 18.1 Di 14:00 Schellingstr. 3
Ice–supersaturated regions — •Peter Spichtinger and Klaus
Gierens — Deutsches Zentrum für Luft- und Raumfahrt, Institut für
Physik der Atmosphäre, Oberpfaffenhofen, Germany
Cirrus clouds, including sub–species as condensation trails and subvisible
cirrus, constitute now a well established research topic within the
atmospheric sciences. But their formation regions, i.e. ice–supersaturated
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air masses, are still not very well characterised. There is now direct evidence,
that ice–supersaturation is frequent in upper tropospheric clear air
and that it does even occur in the lowermost stratosphere. Such regions
have been termed ice–supersaturated regions (ISSRs,
[1] Gierens et al., Ann. Geophys. 17, 1218–1226, 1999
). In the last three years we have evaluated various data sets (aircraft –
MOZAIC, satellite – MLS, radiosondes) and could answer some questions