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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >ACCURATE DETERMINATION OF TOTAL OZONE USING SBUV CONTINUOUS SPECTRAL SCAN MEASUREMENTS
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ACCURATE DETERMINATION OF TOTAL OZONE USING SBUV CONTINUOUS SPECTRAL SCAN MEASUREMENTS

机译：SBUV连续光谱扫描测量准确测定臭氧总量

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Over the last 2 decades, satellite data have been used to monitor long-term global changes in stratospheric ozone. In order to measure relatively small ozone trends on timescales of the order of a decade, degradation of instrument components must be accounted for, and accurate interinstrument calibration must be maintained. In this paper, we have used a self-calibrating method to accurately retrieve total ozone from backscatter ultraviolet spectra in the wavelength range 310 to 340 nm. Using the information contained in this spectral region, we correct for time dependent and time-independent wavelength errors and calibration errors as well as radiative transfer modeling errors. We use continuous spectral scan data from the Nimbus 7 solar backscatter ultraviolet (SBUV) instrument to retrieve total ozone at latitudes between 40 degrees S and 40 degrees N over the time period 1979 to 1986. These total column ozone retrievals are used to independently validate retrievals from the both Nimbus 7 total ozone mapping spectrometer (TOMS) and SBUV in discrete mode. TOMS and SBUV in discrete mode have better temporal and spatial coverage than SBUV in continuous scan mode and are two of the primary instruments used to derive long-term global ozone trends. The time dependence of the difference between total ozone retrieved from SBUV continuous scan and that derived from TOMS and SBUV discrete mode is 0.6+/-0.3%/decade or less depending on latitude. The SBUV continuous scan radiances are modeled to an accuracy of +/-0.3% (1 sigma). Unfortunately, an instrument problem terminated continuous scan mode observations after 1986 so that the later years of TOMS and SBUV discrete mode observations cannot be validated. The methods developed here may also be applied to other continuous spectral backscatter ultraviolet instruments in order to intercalibrate total ozone retrievals. This will be particularly important when temporal overlap of ozone monitoring instruments does not occur as in the case of the Nimbus 7 and Earth Probe TOMS instruments. In addition, the methods used here are applicable to ground-based spectral ultraviolet measurements. [References: 45]
机译：在过去的20年中，卫星数据已用于监测平流层臭氧的长期全球变化。为了在十年左右的时间尺度上测量相对较小的臭氧趋势，必须考虑仪器组件的退化，并且必须保持仪器间的准确校准。在本文中，我们使用了一种自校准方法来准确地从310至340 nm波长范围内的反向散射紫外光谱中检索总臭氧。使用此光谱区域中包含的信息，我们可以校正与时间有关和与时间无关的波长误差和校准误差以及辐射传递建模误差。我们使用Nimbus 7太阳反向散射紫外线（SBUV）仪器的连续光谱扫描数据在1979年至1986年的时间段内检索了南纬40度到40度之间的总臭氧。这些总柱臭氧的回收量用于独立验证回收量来自Nimbus 7总臭氧测图光谱仪（TOMS）和SBUV的分立模式。与连续扫描模式下的SBUV相比，离散模式下的TOMS和SBUV具有更好的时间和空间覆盖范围，并且是用于得出长期全球臭氧趋势的两个主要工具。根据纬度，从SBUV连续扫描获得的总臭氧量与从TOMS和SBUV离散模式获得的总臭氧量之差的时间依赖性为0.6 +/- 0.3％/十年或更小。 SBUV连续扫描辐射的建模精度为+/- 0.3％（1 sigma）。不幸的是，仪器问题终止了1986年以后的连续扫描模式观测，因此后来的TOMS和SBUV离散模式观测无法得到验证。这里开发的方法也可以应用于其他连续光谱反向散射紫外仪器，以便相互校准总的臭氧回收量。当臭氧监测仪器不会像Nimbus 7和Earth Probe TOMS仪器那样发生时间重叠时，这一点尤其重要。此外，此处使用的方法适用于地面光谱紫外线测量。 [参考：45]

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