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We present a first quantification of the near-infrared (NIR) water vaporcontinuum absorption from an atmospheric radiative closure experiment carriedout at the Zugspitze (47.42° N, 10.98° E; 2964 m a.s.l.).Continuum quantification is achieved via radiative closure usingradiometrically calibrated solar Fourier transform infrared (FTIR) absorption spectra covering the 2500 to7800 cm−1 spectral range. The dry atmospheric conditions at theZugspitze site (IWV 1.4 to 3.3 mm) enable continuum quantification evenwithin water vapor absorption bands, while upper limits for continuumabsorption can be provided in the centers of window regions. Throughout75 % of the 2500 to 7800 cm−1 spectral range, the Zugspitze results agree within our estimated uncertainty with the widely used MT_CKD2.5.2 model (Mlawer et al., 2012). In the wings of water vapor absorptionbands, our measurements indicate about 2–5 times stronger continuumabsorption than MT_CKD, namely in the 2800 to 3000 cm−1 and 4100 to4200 cm−1 spectral ranges. The measurements are consistent with thelaboratory measurements of Mondelain et al. (2015), which rely on cavityring-down spectroscopy (CDRS), and the calorimetric–interferometricmeasurements of Bicknell et al. (2006). Compared to the recent FTIRlaboratory studies of Ptashnik et al. (2012, 2013), our measurements areconsistent within the estimated errors throughout most of the spectral range.However, in the wings of water vapor absorption bands our measurementsindicate typically 2–3 times weaker continuum absorption under atmosphericconditions, namely in the 3200 to 3400, 4050 to 4200, and 6950 to7050 cm−1 spectral regions

atmospheric chemistry and physics

The Zugspitze radiative closure experiment for quantifying water vapor absorption over the terrestrial and solar infrared – Part 3: Quantification of the mid- and near-infrared water vapor continuum in the 2500 to 7800 cm&lt;sup&gt;−1&lt;/sup&gt; spectral range under atmospheric conditions