In this paper, the characteristics of atmospheric boundary layer over two types of topography, Xigu District, Lanzhou (complex topography) and Lanzhou New District (flat terrain), were simulated by WRF model, the discrepancies between the two types topography on surface wind field, temperature, theta profile, surface flux and atmospheric boundary layer height were analyzed to discuss the effect of topography on the atmospheric boundary layer.The results indicated that: Characteristics of the underlying surface have a considerable influence on the atmospheric boundary layer.Rough underlying surface in Xigu District results in a lower near-surface wind speed than that in Lanzhou New District, this is also the main reason why the daytime momentum flux in the valley basin of Xigu District was significantly stronger than that of Lanzhou New District.Compared with the homogeneous near-surface flow in Lanzhou New District, the near-surface flow field in the valley basin of Xigu District was highly complicated.Thermal effect of solar radiation in the daytime over dry underlying surface in Lanzhou New District was more efficient than that on river basin in Xigu District, which leads to higher maximum boundary layer height in Lanzhou new area.
Chuang QIN
,
Ying WANG
,
Meng HUANG
,
Bo LI
,
Xuechao LI
. Comparative Study of Boundary Layer Characteristics between Valley Basin and Gentle Hillside in Semi-Arid Region in Winter[J]. Plateau Meteorology, 2020
, 39(5)
: 1045
-1057
.
DOI: 10.7522/j.issn.1000-0534.2019.00089
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