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IDOAS

Airborne DOAS measurements


Introduction   References    Contact

Top Introduction:

 DOAS observations from aircraft have been performed for many years. Airborne observations offer a number of advantages

  • access to remote areas

  • ability to probe large latitudinal / longitudinal transsects in a short time

  • measurements without cloud interference.

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:

Top References:

Top Contact:

If you are interested in more information on airborne observations at the IUP Bremen, please contact Anja Schönhardt or Andreas Richter.

web master:  folkard@iup.physik.uni-bremen.de      Last Update: 11-04-16