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MIPAS-ENVISAT limb-sounding measurements: trade-off study for improvement of horizontal resolution

机译：MIPAS-ENVISAT肢体测量：改善水平分辨率的权衡研究

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摘要

The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is a limb-scanning spectrometer that has operated onboard the Environmental Satellite since the end of March 2002. Common features of limb-scanning experiments are both high vertical resolution and poor horizontal resolution. We exploit the two-dimensional geo-fit retrieval approach [Appl. Opt. 40, 1872-1875 (2001)] to investigate the possibility of improving the horizontal resolution of MIPAS measurements. Two different strategies are considered for this purpose, one exploiting the possibility (offered by the geo-fit analysis method) for an arbitrary definition of the retrieval grid, the other based on the possibility of saving measurement time by degrading the spectral resolution of the interferometer. The performances of the two strategies are compared in terms of the trade-off between the attained horizontal resolution and the retrieval precision. We find that for ozone it is possible to improve by a factor of 2 the horizontal resolution, which in the nominal measurement plan is ～530 km. This improvement corresponds to a degradation of the retrieval precision, which on average varies from a factor of 1.4 to 2.5, depending on the adopted spectral resolution.
机译：迈克尔逊被动大气探测干涉仪（MIPAS）是一种肢体扫描光谱仪，自2002年3月底开始在环境卫星上运行。肢体扫描实验的共同特征是垂直分辨率高和水平分辨率差。我们利用二维地理拟合检索方法[Appl。选择。 40，1872-1875（2001）]来研究改善MIPAS测量的水平分辨率的可能性。为此，考虑了两种不同的策略，一种是利用（由地理拟合分析方法提供的）任意定义检索网格的可能性，另一种是通过降低干涉仪的光谱分辨率来节省测量时间的可能性。根据获得的水平分辨率和检索精度之间的权衡，比较了这两种策略的性能。我们发现，对于臭氧，可以将水平分辨率提高2倍，在名义测量计划中，水平分辨率约为530 km。这种改进对应于检索精度的下降，取决于所采用的频谱分辨率，平均下降幅度为1.4到2.5。

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