Characteristics and Numerical Simulations of Extremely Large Atmospheric Boundary-layer Heights over an Arid Region in North-west China |
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| Authors: | Minjin Ma Zhaoxia Pu Shigong Wang and Qiang Zhang |
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| Institution: | (1) Unit? Climat Sol Environnement, INRA, domaine St Paul, site Agroparc, 84914 Avignon, France;(2) Institut Pierre Simon Laplace/Service d’A?ronomie, Universit? Pierre et Marie Curie, 75252 Paris, France;(3) INRA, UR1263 EPHYSE, 71 av. Edouard Bourlaux, 33883 Villenave d’Ornon, France;(4) CNRM, 42 avenue Coriolis, 31000 Toulouse, France;(5) Ecosyst?mes Littoraux et C?tiers - FRE 2816, Universit? du Littoral C?te d’Opale, 32 avenue Foc, 62930 Wimereux, France |
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| Abstract: | Over arid regions in north-west China, the atmospheric boundary layer can be extremely high during daytime in late spring
and summer. For instance, the depth of the observed convective boundary layer can exceed 3,000 m or even be up to 4,000 m
at some stations. In order to characterize the atmospheric boundary-layer (ABL) conditions and to understand the mechanisms
that produce such an extreme boundary-layer height, an advanced research version of the community weather research and forecasting
numerical model (WRF) is employed to simulate observed extreme boundary-layer heights in May 2000. The ability of the WRF
model in simulating the atmospheric boundary layer over arid areas is evaluated. Several key parameters that contribute to
the extremely deep boundary layer are identified through sensitivity experiments, and it is found that the WRF model is able
to capture characteristics of the observed deep atmospheric boundary layer. Results demonstrate the influence of soil moisture
and surface albedo on the simulation of the extremely deep boundary layer. In addition, the choice of land-surface model and
forecast lead times also plays a role in the accurate numerical simulation of the ABL height. |
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