Measurements of vertical fluxes of latent heat in the planetary boundary layer show significant humidity variability, suggesting important implications for atmospheric studies.
Water vapor measurements from the newly developed ATMONSYS DIAL system are presented. Besides the presentation of the overall system capabilities, we show that the system, in combination with Doppler wind lidars, is able to capture vertical fluxes of latent heat. In addition, we show a substantial natural short-term relative variability of humidity inside the PBL of ~20%. Finally, an extended intercomparison of 3 humidity lidars and radiosondes shows that the drift of the radiosondes can have substantial implications.
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Speidel et al. (2026) studied this question.
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