从上空往下看，在1973年至2000年间，西南亚美索不达米亚地区的沼泽地跨越伊拉克与伊朗两国交界的边境地区，位于浩瀚的底格里斯河与幼发拉底河附近。
Seen from above between 1973 and 2000 the Mesopotamia marshlands straddle the borders between Iraq and Iran near the mighty Tigris and Euphrates rivers.
在西部型南亚高压条件下，低纬度地区含低浓度o3的空气不易到达高原上空，青藏高原上空的O3低值较弱。
During the west phase of the South Asia high, the low O3 air is difficult to transport to the top of the Tibetan Plateau and the low O3 is weak over the Tibetan Plateau.
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