南极近地层大气的热量逆梯度输送现象

THE COUNTERGRADIENT HEAT FLUX IN THE ATMOS- PHERIC SURFACE LAYER IN THE SOUTH POLE

根据南极中山站观测结果 ,分析了南极地区近地层热量逆梯度输送的现象。结果表明南极地区在近地层逆温较明显时 ,常会出现热量逆梯度输送的现象 ;同时也探讨了近地层在稳定层结条件下 ,热量逆梯度输送通量的多尺度计算方法。计算结果表明 ,逆梯度输送的感热通量主要是由浮力湍涡的穿越能力决定的 ,而经典的梯度输送公式在该场合下无法使用。

Countergradient heat flux in the surface layer in South Pole is analyzed based on the data obtained from the field experiments near China Zhongshan Observatory in South Pole. The analyses show that the countergradient heat flux often occurs in the stable atmospheric surface layer even when the inversion strength is fairly strong. A multiscaling method of calculating the countergradient heat flux is also discussed at the stable stratification in the surface layer. The calculating result makes it known that the countergradient heat flux is mainly caused by the penetration of buoyancy turbulence eddy and the flux nearly is so independent to the temperature gradient that the classic gradient transfer formula is fail to be useful in that cases above stated.