Tropical simultaneous nadir observations for IR sounder evaluation and comparison

Evan M. Manning; Hartmut H. Aumann

doi:10.1117/12.2187151

8 September 2015 Tropical simultaneous nadir observations for IR sounder evaluation and comparison

Evan M. Manning, Hartmut H. Aumann

Proceedings Volume 9607, Earth Observing Systems XX; 96070L (2015) https://doi.org/10.1117/12.2187151
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Simultaneous Nadir Observations (SNOs) contain thousands of pairs of observations taken within 8 km and 10 minutes. SNOs have been very useful for comparisons in polar conditions. But classic SNO pairing criteria have very low yield in the tropics, making these SNOs less useful for investigating instrument performance for hotter scenes or scenes with high contrast. We introduce a modified methodology, which finds pairs of matched spectra in a wider angular range but is restricted to the tropics. We illustrate this with AIRS and CrIS data. Insight into instrument differences is gained from statistical distributions of the residual differences between the matched pairs. A sample analysis compares AIRS and CrIS brightness temperature at 900 cm-1 as function of scene brightness temperature. The proposed method may be applicable to matchups of other sensors on different spacecraft.

Citation Download Citation

Evan M. Manning and Hartmut H. Aumann "Tropical simultaneous nadir observations for IR sounder evaluation and comparison", Proc. SPIE 9607, Earth Observing Systems XX, 96070L (8 September 2015); https://doi.org/10.1117/12.2187151

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