University of Reading 2007www.nerc-essc.ac.uk/~rpa Increased moisture enhances atmospheric radiative cooling to surface ERA40 NCEP Allan (2006) JGR 111, D22105 SNLc = clear-sky surface net down longwave radiation CWV = column integrated water vapour dSNLc/dCWV ~ W kg -1 dCWV (mm)
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