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MAX-DOAS measurements in Bremen
Introduction Instrument Data References Links Contact
Introduction:
Since early 1993, DOAS zenith-sky measurements are continuously performed from the roof of the Physics Department at the University of Bremen. In 1994, a second instrument was added to separate the UV and visible parts of the spectrum, thereby improving the detection limits in the UV.
Bremen (53°N, 9°E) is a typical mid-latitude location close to the North Sea. In winter and spring, it is occasionally influences by polar air masses, but usually is situated well out of the polar vortex. In spite of the frequent supply of clean air from the sea, measurements are affected by both local pollution from the nearby highway, coal fired power plants and an incinerating plant, and regional pollution by steel industry. Therefore, tropospheric NO2 concentrations are usually high and very variable. In contrast, tropospheric ozone concentrations rarely exceed the warning limits and usually are much lower than in other industrialized regions.
Instrument:
The instrument in Bremen consists of two grating spectrometers, one for the UV (310 - 420 nm), the second one for the visible spectral range (400 - 700 nm). Both spectrometers are equipped with cooled CCD detectors and are temperature stabilized to minimize spectral drift. In January 2004, the instrument was relocated to the new building of the Institute of Environmental Physics, Bremen. Since then, it equipped with a MAXDOAS telescope. As this instrument is used for testing and development, many changes have been made over the years with respect to instrumentation, viewing directions and measurement protocol. Since 2012, the instrument is equipped with a telescope that can be pointed in nearly any direction, providing measurements in the zenith-direction, vertical scans in several azimuthal directions and also Total-DOAS observations of sun-illuminated targets in the surrounding of the institute.
More on the instrument and measurement principle can be found on our MAXDOAS page.
Data:
If you have any requests, please contact Andreas Richter.
References:
- SCIAMACHY validation with ground-based DOAS observations final report (in German)
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Müller, R.W., H. Bovensmann, J. W. Kaiser, A. Richter, A. Rozanov, F. Wittrock, and J. P. Burrows, Consistent Interpretation of Ground based and GOME BrO Slant Column Data, Adv. Space Res., 29(11) ,1655-1660, 2002
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van Roozendael, M., T. Wagner, A. Richter, I. Pundt, D. W. Arlander, J.P. Burrows, M. Chipperfield, C. Fayt, P.V. Johnston, J.-C. Lambert, K. Kreher, K. Pfeilsticker, U. Platt, J.-P. Pommereau, B.-M. Sinnhuber, K. K. Toernkvist, and F. Wittrock: Intercomparison of BrO Measurements from ERS-2 GOME, ground-based and Balloon Platforms, Adv. Space Res., 29(11), 1661-1666, 2002
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Sinnhuber, B.-M., D. W. Arlander, H. Bovensmann, J. P. Burrows, M. P. Chipperfield, C.-F. Enell, U. Frieß, F. Hendrick, P. V. Johnston, R. L. Jones, K. Kreher, N. Mohamed-Tahrin, R. Müller, K. Pfeilsticker, U. Platt, J.-P. Pommereau, I. Pundt, A. Richter, A. M. South, K. K. Toernkvist, M. Van Roozendael, T. Wagner, and F. Wittrock, On stratospheric bromine monoxide: Intercomparison of measured and modeled slant column densities from a near-global network, submitted to JGR, 2001
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Richter, A., M. Van Roozendael, T. Wagner, J.-C. Lambert, D. W. Arlander, J. P. Burrows, C. Fayt, P. V. Johnston, R. Jones, K. K. Toernkvist, K. Kreher, K. Pfeilsticker, U. Platt and I. Pundt, BrO measurements from GOME and from the Ground: An Intercomparison Study., Fifth European Workshop on Stratospheric Ozone, St. Jean de Luz, France, 1999.
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Richter, A., M. Eisinger, A. Ladstätter-Weißenmayer and J. P. Burrows:
DOAS zenith sky observations. 2. Seasonal variation of BrO over Bremen (53°N) 1994-1995, J. Atm. Chem., 32, pp. 83-99, 1999. -
A. Richter, Absorptionsspektroskopische Messungen stratosphärischer Spurengase über Bremen, 53° N, PhD-Thesis, University of Bremen, June 1997 (in german)
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Richter, A., M. Eisinger, F. Wittrock, S. Schlieter, A. Ladstätter-Weißenmayer and J. P. Burrows, Zenith Sky and GOME DOAS measurements of atmospheric trace gases above Bremen, 53° N: 1994-1997, 4th Europ. Symp. on Stratos. Ozone Res., Schliersee, FRG, 1997.
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Eisinger, M., A. Richter, A. Ladstätter-Weißmayer, and J. P. Burrows, DOAS zenith sky observations: 1. BrO measurements over Bremen (53°N) 1993-1994, J. Atm. Chem., 26, pp. 93-108, 1997.
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Richter, A., M. Eisinger, A. Ladstätter-Weißmayer, F. Wittrock, and J. P. Burrows,
Ground based UV/VIS measurements of O3 NO2 and BrO over Bremen (53°N). XVIII Quadr. Ozone Symp. (IO3C), L'Aquila, Italy, September 1996. -
Richter, A., M. Eisinger, A. Ladstätter-Weißenmayer, F. Wittrock and J. P. Burrows, Ground based UV/vis measurements of O3 , NO2 , BrO, and OClO over Bremen (53°N). Proceedings of the Third European Workshop, pp. 373-378, Schliersee, FRG, 1995.
Links:
Contact:
If you are interested in more information or would like to have access to our data, please contact Andreas Richter.