Abstract
Measurements of trace gases by remote sensors which observe the atmospheric limb have a natural vertical resolution of 2– 3 km . With a typical field of view this becomes 3– 5 km . Oversampling, combined with acceptance of a degradation in random error, improves the vertical resolution. We investigate the improvement by means of Backus–Gilbert trade-off curves. Sacrificing a factor 10 in random error results in resolutions of 1.5 km for measurements of weak absorption or emission, and 1 km for strong pressure-broadened absorption. Weighting function calculations are technically more difficult for airborne than for satellite limb-sounders; oversampled functions cause more technical difficulty.
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