Schematic diagrams of the atmospheric internal boundaries of three pollution types in front of the Taihang Mountains (IMAGE)
Caption
According to the atmospheric internal boundary conditions, haze pollution in front of the Taihang Mountains can be divided into three types. Frontal type pollution (figure a) arises under the mountain thermal effects and the warm front. The cold polluted air mass at the mountain front is covered by a dome-like warm cap, which restricted the diffusion of polluted air both in horizontal and vertical directions. Wind shear type pollution is characterized by airflow convergence, mainly in two modes, the westerly-southwesterly wind shear (figure b) and southerly-northerly wind shear, which provide dynamic conditions for pollutant transport and accumulation. For topographic obstruction type pollution (figure c), the cold air mass is dammed at the windward side in front of the mountains; the warm southerly advection is obstructed by the mountains and adjusted into cold easterly advection; air masses ascend after converging at the mountain front and then cool down, showing significant inversion at the boundary of the cold air zone.
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