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contributor authorWestra, D.
contributor authorSteeneveld, G. J.
contributor authorHoltslag, A. A. M.
date accessioned2017-06-09T17:14:31Z
date available2017-06-09T17:14:31Z
date copyright2012/08/01
date issued2012
identifier issn1525-755X
identifier otherams-81692.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4224723
description abstracthe tendency of the relative humidity at the top of a clear convective boundary layer (RHtop) is studied as an indicator of cloud formation over a semiarid region within the conceptual framework introduced by Ek and Holtslag. Typically the tendency of RHtop increases if the evaporative fraction at the land surface increases, which supports boundary layer moistening but only when boundary layer growth is limited by atmospheric factors. This regime was supported by Cabauw observations in the original study. Here, new observational evidence that the tendency of RHtop can also increase as the surface becomes more dry, as is consistent with another regime of the conceptual framework, is provided. The observations used are from the African Monsoon Multidisciplinary Analyses (AMMA) intensive observational campaign near Niamey, Niger, 20?25 June 2006. In addition, the authors evaluate whether various versions of the Weather Research and Forecasting single-column model confirm the different regimes of the conceptual framework for a typical day in the AMMA campaign. It appears that the model confirms that dryer soils can support cloud formation.
publisherAmerican Meteorological Society
titleSome Observational Evidence for Dry Soils Supporting Enhanced Relative Humidity at the Convective Boundary Layer Top
typeJournal Paper
journal volume13
journal issue4
journal titleJournal of Hydrometeorology
identifier doi10.1175/JHM-D-11-0136.1
journal fristpage1347
journal lastpage1358
treeJournal of Hydrometeorology:;2012:;Volume( 013 ):;issue: 004
contenttypeFulltext


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