大气科学进展（英文版）
大氣科學進展（英文版）
대기과학진전（영문판）
ADVANCES IN ATMOSPHERIC SCIENCES
2010年
3期
605-620
,共16页
湍流动能%金塔绿洲%相互作用%次级环流%表面层%平均流量%夏季%潜热通量
湍流動能%金塔綠洲%相互作用%次級環流%錶麵層%平均流量%夏季%潛熱通量
단류동능%금탑록주%상호작용%차급배류%표면층%평균류량%하계%잠열통량
heterogeneous atmospheric boundary layer%turbulent kinetic energy equations%energy con-version%secondary circulation%oasis effect
The kinetic energy variations of mean flow and turbulence at three levels in the surface layer were calculated by using eddy covariance data from observations at Jinta oasis in 2005 summer. It is found that when the mean horizontal flow was stronger, the turbulent kinetic energy was increased at all levels, as well as the downward mean wind at the middle level. Since the mean vertical flow on the top and bottom were both negligible at that time, there was a secondary circulation with convergence in the upper half and divergence in the lower half of the column. After consideration of energy conversion, it was found that the interaction between turbulence and the secondary circulation caused the intensification of each other. The interaction reflected positive feedback between turbulence and the vertical shear of the mean flow. Turbulent sensible and latent heat flux anomaly were also analyzed. The results show that in both daytime and at night, when the surface layer turbulence was intensified as a result of strengthened mean flow, the sensible heat flux was decreased while the latent heat flux was increased. Both anomalous fluxes contributed to the cold island effect and the moisture island effect of the oasis.
