Radiative destabilization of the nocturnal stable atmospheric boundary layer over the desert |
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| Authors: | Branko Grisogono Robert E Keislar |
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| Institution: | (1) Desert Research Institute, Reno, NV, USA;(2) Geophysical Institute, Faculty of Science, Univ. of Zagreb, P.O.B. 224, Zagreb, Croatia |
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| Abstract: | Radiative destabilization of the nocturnal stable atmospheric boundary layer (NSABL) over homogeneous desert terrain is predicted by an analytical model based on a modified diffusion equation. The model applies late at night under calm, dry conditions when long-wave radiative transfer dominates the NSABL evolution. A three-layer structure for the NSABL is proposed: a shear sub-layer closest to the surface, a radiative sub-layer which contains the inversion top, and a coupling sub-layer which matches the NSABL with the residual layer aloft. A sub-sub-layer called the nocturnal internal boundary layer (NIBL) is nested within the radiative sub-layer and comprises the temperature maximum. The model can explain: (1) maximum cooling in the NIBL, (2) deepening of the NIBL, (3) radiative destabilization of the NSABL, and (4) possible surface warming before sunrise. An example from the Mohave Desert, USA is presented, and the observed temperature profile compares favorably with the model solution. |
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