青藏高原夏季臭氧低谷形成的机理-臭氧输送和化学过程

利用三维化学输送模式(OSLO CTM2)模拟青藏高原夏季臭氧低谷。结果表明：在青藏高原夏季臭氧低谷的形成和变化过程中，动力输送过程起着最主要作用，化学过程部分补偿了输送过程引起的臭氧减少。在动力输送过程中，水平输送在5月份是造成臭氧减少的主要原因，可在6月和7月成为使臭氧增加；垂直平流的作用不断增强，在6月和7月成为臭氧减少的主要因素；对流输送的作用在7月份大幅增加，其引起的臭氧减少可以与净的变化相比，其作用也不可忽视。气相的化学过程引起的臭氧增加的量值有时超过了臭氧的净变化的大小，因此它也起着重要作用。

Mechanism of Formation of the Ozone Valley over the Tibetan Plateau in Summer— Transport and Chemical Process of Ozone

With the 3D chemical transport model OSLO CTM2, the valley of total column ozone over the TibetanPlateau in summer is reproduced. The results show that when the ozone valley occurs and develops, thetransport process plays the main part in the ozone reduction, but the chemical process partly compensatesfor the transport process. In the dynamic transport process of ozone, the horizontal transport process playsthe main part in the ozone reduction in May, but brings about the ozone increase in June and July. Thevertical advective process gradually takes the main role in the ozone reduction in June and July. The effectof convective activities rises gradually so that this effect cannot be overlooked in July, as its magnitudeis comparable to that of the net changes. The effect of the gaseous chemical process brings about ozoneincreases which are more than the net changes sometimes, so the chemical effect is also important.