download pdf - Institut für Umweltphysik - Ruprecht-Karls-Universität ...

Contents
1 Introduction/Overview of institute 9
2 Atmosphere and Remote Sensing 11
2.1 Tropospheric Research Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1.1 Halogen oxide and sulphur dioxide emission of volcanoes . . . . . . . . . . . . . 19
2.1.2 Studies of Reactive Halogen Species (RHS) in the Marine and mid-Latitudinal
Boundary Layer by Active Longpath Differential Optical Absorption Spectroscopy
(DOAS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.1.3 Improvement of the Detection Limit of Active-DOAS-Measurements by use of
fibre coupled light source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.1.4 New Operational Software for Automatic DOAS Measurement and Analysis . . 22
2.1.5 Ground based MAX-DOAS measurements . . . . . . . . . . . . . . . . . . . . . 23
2.1.6 Imaging DOAS. Imaging of two-dimensional trace gas distributions . . . . . . . 24
2.1.7 Multi Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) of Trace
Gas and Aerosol Distributions . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.1.8 The flying laboratory: DOAS on board the CARIBIC aircraft project . . . . . 26
2.1.9 Heidelberg ground-based network . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.1.10 Applicability of light-emitting diodes as light sources
for active DOAS measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.1.11 Active DOAS measurements of trace gases in the free troposphere . . . . . . . 29
2.1.12 Long Term Observations of Urban Atmospheric Radical Chemistry
(TURBAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.2 Stratospheric Ozone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.2.1 Investigation of Inorganic Stratospheric Bromine . . . . . . . . . . . . . . . . . 38
2.2.2 Stratospheric photochemistry of ozone, nitrogen and chlorine species . . . . . . 39
2.2.3 Photolytic lifetime of stratospheric N2O5 . . . . . . . . . . . . . . . . . . . . . 40
2.2.4 Spectroscopic measurements of halogen oxides in the marine boundary layer in
Alcântara/Brazil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
2.2.5 Ground-based direct Sun UV/vis spectroscopy in Timon/Northeastern Brazil:
Comparison of tropospheric air mass pollution in the dry and wet season . . . 42
2.3 Radiative Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
2.3.1 Development and Application of a Versatile Balloon-Borne DOAS Instrument
for Skylight Radiance and Atmospheric Trace Gas Profile Measurements . . . . 48
2.3.2 Oxygen A-band measurements for solar photon path length distribution studies 49
2.3.3 Absolutely calibrated solar irradiance measurements . . . . . . . . . . . . . . . 50
2.3.4 Atmospheric detection of water dimers and their contribution to solar shortwave
absorption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
2.4 DOAS Tomography Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2.4.1 Intercomparison of ambient in-situ Formaldehyde Measurements in urban Air . 58
2.4.2 Trace gas distributions from long-path DOAS measurements . . . . . . . . . . 59
2.4.3 Airborne measurements of the CH2O and NO2 distributions in the Po basin . 60
2.4.4 Development of a Multibeam instrument for simultaneous measurements along
multiple light paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
2.4.5 An Indoor Test Campaign of the Tomography Long Path Differential Optical
Absorption Spectroscopy (DOAS) Technique . . . . . . . . . . . . . . . . . . . 62
2.4.6 2D and 3D tomographic LP-DOAS measurements of trace gas distributions in
Heidelberg over an area of 4 ∗ 4 km 2 . . . . . . . . . . . . . . . . . . . . . . . . 63
2.4.7 Two-dimensional measurement of motorway emission plumes . . . . . . . . . . 64
5