On the influence of surface heterogeneity on latent heat fluxes and stratus properties
نویسنده
چکیده
A mesoscale atmospheric model is used to examine the three-dimensional structure and evolution of low extended stratus over various synthetic landscapes of different heterogeneity in mid-latitudes in spring. The simulation results substantiate that surface heterogeneity nonlinearly influences the distributions of latent heat fluxes, vertical motions, and cloud-water presupposed the length of the patches of equal surface type is about 10 km or larger than that. For low degrees Ž . of heterogeneity large patch sizes , a great coverage by lowly evapotranspiring, but strongly heating patches may enhance vertical motion. Moreover, this constellation may increase the cloud-water amount of low extended stratus as compared to that of the other heterogeneous landscapes or that with the highest domain-averaged daily sum of latent heat fluxes. Although there exists a relationship between the degree of heterogeneity and the modulation of latent heat fluxes as well as cloud-water amount, the kind of surface characteristics is also important for the modulation of the properties of low extended stratus. q 2000 Elsevier Science B.V. All rights reserved.
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