研究目的
To determine vertical ozone profiles from measurements of spectral global irradiance in the ultraviolet, similar to the Umkehr technique, but using global irradiance instead of zenith sky radiance.
研究成果
The Global-Umkehr method provides vertical ozone profiles with biases comparable to the standard zenith-sky Umkehr method. The method is particularly useful for locations where zenith-sky observations are not available.
研究不足
The method's sensitivity is most pronounced in the altitude range of 20 to 45 km with a resolution of about 10 km within this range. The technique cannot be applied in the presence of optically thick clouds which increase ozone absorption of tropospheric ozone due to path length enhancement.
1：Experimental Design and Method Selection:
The method is based on the optimal estimation approach (Gauss–Newton method) developed by Rodgers (2000). It involves iterative determination of the ozone concentration as a function of altitude or pressure.
2：0). It involves iterative determination of the ozone concentration as a function of altitude or pressure. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Measurements from a high-resolution spectroradiometer installed near the centre of the Greenland ice sheet were used. Retrieved profiles were validated with balloon-sonde observations and ozone profiles from the space-borne Microwave Limb Sounder (MLS).
3：List of Experimental Equipment and Materials:
A SUV-150B spectroradiometer designed by Biospherical Instruments Inc. was used.
4：Experimental Procedures and Operational Workflow:
Spectral irradiances at 310 and 337 nm were calculated for all spectra measured during a given period of Umkehr observations and interpolated to a common SZA grid.
5：Data Analysis Methods:
The retrieval method involves constructing a measurement vector from ratios of global spectral irradiance at two wavelengths and using a forward model to simulate these measurements.
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