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Airborne DOAS measurements
Introduction References
Contact
DOAS observations from aircraft
have been performed for many years. Airborne observations offer a number of
advantages
For stratospheric measurements, mainly zenith-sky observations are of
interest. Using limb (horizon) observations, very long light paths at flight
altitude can be obtained, providing excellent detection limits which is
particularly important in the tropopause region. In addition, vertical profiles
can be obtained by either changing flight altitude or by using observations
under different elevation angles and applying appropriate inversion algorithms.
For tropospheric measurements, nadir observations are suited best and by
selecting the flight pattern appropriately, emission plumes can be probed at
different distances from a source providing information on emission strength and
atmospheric lifetime of a substance. By using measurements at different
wavelengths, some vertical resolution can be obtained even if the flight
altitude is not varied.
If an imaging spectrometer is used in nadir view, several
measurements across track can be taken in parallel, and as the aircraft moves
forward, a stripe of spatially resolved trace gas observations is created.
This observation mode is similar to that from a satellite, only
that the lower flight altitude and slower forward movement allows for much
better spatial resolution.
In addition to emission monitoring and determination of spatial patterns of
trace gas distributions, airborne DOAS observations are also well suited for
validation of satellite observations.
The IUP Bremen has developed and operated two types of airborne DOAS
instruments for which more information is available:
-
Schönhardt, A., Altube, P., Richter, A., Krautwurst, S., Gerilowski, K., Burrows, J.P.,
Aircraft measurements of anthropogenic NO2 with an imaging DOAS instrument,
DPG Spring meeting, Berlin, Germany, March 2012
-
Schönhardt, A., Richter, A., Krautwurst, S., Gerilowski, K., Wittrock, F., Burrows, J. P.,
A new airborne imaging DOAS instrument - development and first measurements,
5th International DOAS Workshop, Mainz, Germany, July 2011
-
P. Altube Vázquez, Aircraft measurements of tropospheric NO2 with an imaging DOAS instrument,
Master Thesis, University of Bremen, August 2012
-
Bruns, M., Buehler, S. A., Burrows, J. P., Richter, A., Rozanov, A., Wang, P., Heue, K.-P., Platt, U., Pundt, I., Wagner, T.,
NO2 Profile Retrieval using airborne multi axis UV-visible skylight absorption measurements over central Europe,
Atmos. Chem. Phys., 6, 3049-3058, 2006
- P. Wang, A. Richter, M. Bruns, J. P. Burrows, W. Junkermann, K.-P. Heue, T. Wagner, U. Platt, I. Pundt,
Airborne multi-axis DOAS measurements of tropospheric SO2 plumes in the Po-valley, Italy,
Atmos. Chem. Phys., 6, 329-338, 2006
- Project "SCIAMACHY validation with airborne DOAS observations"
final report (in
German)
- Fix, A., Ehret, G., Flentje, H., Poberaj, G., Gottwald, M., Finkenzeller,
H., Bremer, H., Bruns, M., Burrows, J. P., Kleinböhl, A., Küllmann, H., Kuttippurath,
J., Richter, A., Wang, P., Heue, K.-P., Platt, U., Pundt, I., Wagner,
T.,
SCIAMACHY validation by aircraft remote sensing: design, execution, and first
measurement results of the SCIA-VALUE mission, Atmos. Chem. Phys.,
5, 1273-1289, 2005
- K.-P. Heue, A. Richter, T. Wagner, M. Bruns, J. P. Burrows, C. v. Friedeburg,
W. D. Lee, U. Platt, I. Pundt, P. Wang,
Validation of SCIAMACHY tropospheric NO2-columns with AMAXDOAS measurements,
Atmos. Chem. Phys., 5, 1039-1051, 2005
- Wang, P., A. Richter, M. Bruns, V. V. Rozanov, J. P. Burrows, K.-P. Heue,
T. Wagner, I. Pundt, U. Platt,
Measurements of tropospheric NO2 with an airborne multi-axis DOAS instrument,
Atmos. Chem. Phys., 5, 337-343, 2005
- M. Bruns:
NO2 Profile
Retrieval using Airborne Multiaxis Differential Optical Absorption Spectrometer
(AMAXDOAS) data, PhD Thesis, University of Bremen, 2004
- Bruns, M., S. Bühler, J. P. Burrows, K.-P. Heue, U. Platt, I. Pundt, A. Richter,
A. Rozanov, T. Wagner, P. Wang,
Retrieval of Profile Information
from Airborne Multi Axis UV/visible Skylight Absorption Measurements, Applied
Optics, 43 (22), 4415-4426, 2004
If
you are interested in more information on airborne observations
at the IUP Bremen, please contact
Anja
Schönhardt
or Andreas
Richter.
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