Comparison of stratospheric ozone profiles retrieved from microwave-radiometer and Dobson-spectrometer data

Physics

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Atmospheric Composition, Ozonometry, Remote Sensors, Stratosphere, Microwave Radiometers, Partial Pressure, Spectrometers, Umkehr Effect, Vertical Distribution

Scientific paper

Passive Microwave Remote Sensors (MRS) can provide information on the composition of the atmosphere by measuring the thermal radiation emitted from rotational transitions of atmospheric molecules. Ozone profiles simultaneously obtained from an MRS and a Dobson instrument (Umkehr method) are compared over a time period of approximately four months. The microwave measurements yield ozone concentrations which are 20-30 percent higher than the Umkehr values. A critical, though not well known, parameter for the microwave inversion procedure is the foreign-gas pressure-broadening parameter (C) for the observed 142-GHz ozone resonance. Throughout the intercomparison a value of 3 MHz/mb is used. There is recent theoretical and experimental indication that C is more likely to be as low as 2.5 MHz/mb. Using this new value for C, all microwave retrieved profiles decrease by 20-25 percent thus leading to a far better agreement with the Umkehr results. The measurements therefore strongly support the proposed value of 2.5 MHz/mb.

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