GEOG 214 Lecture Notes - Lecture 5: Earth'S Energy Budget, Shortwave Radiation, Radiative Forcing
22 Feb 2016
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4 + l (1 - s )] (explained last week) 4 + s l = s l - s ts. Net all-wave radiation (q*) is the sum of the net shortwave radiation (k*) and net longwave radiation (l*): = k (1 - ) + s l - s ts. 4: q* is the main energy driving climates. Absorbed lw emitted lw: q* can be positive (usually by day) or negative (usually at night) Summary: daytime solar gain (k*) is partly offset by more constant net loss of lw radiation (l*) (emission from warmer surface exceeds input from sky) There is a strong correlation between q* and k , i. e. , the daily q* variation is mainly driven by the solar cycle. At night, net lw loss is unopposed due to absence of sw input, so l* = q: cloud reduces extremes because it decreases both sw gain and lw loss.
