辽宁省区域性空气污染的天气分型

Synoptic patterns of regional air pollution in Liaoning Province

应用2003—2004年主要污染物浓度和气象资料,对辽宁省全年的PM10产生的区域性3级空气污染进行环流分型,按污染源划分为冬季煤烟型、春季沙尘型和夏秋大雾型。其中冬季煤烟型又分为长白山高压地形槽型、高压内部均压场型、东北高压脊,西部倒槽型、蒙古高压前均压场、蒙古低压前均压场、高压内部小范围均压场型6个型;春季沙尘型分为东北低压型、南大风型和干冷锋北大风型;夏秋大雾型分为低压槽型和低压前均压场。上述类型几乎概括了近两年PM103级污染的所有个例,为大气环境质量预报、总量控制等提供依据。

The 2003--2004 weather data and concentration data for three air pollutants （SO2, NOx, PM10） are employed to classify important circulation patterns of regional air pollution in Liaoning. Based on the source of pollution, the major PM10 circulation patterns are： the winter coom pattern, the spring dust pattern, and the summer--autumn dense fog pattern. The winter coom pattern consists of six sub-patterns： Changbai high and terrain trough pat- tern, uniform pressure field inside Mongolia high circulation pattern, Northeast high ridge and west inverse trough circulation pattern, uniform pressure field in front of Mongolia high circulation pattern, uniform pressure field in front of Mongolia low circulation pattern, and small uniform pressure field inside high circulation pattern. The spring dust pattern has three sub-patterns： northeast low pattern, south gale pattern, and cold front north gale pattern; the summer and autumn dense fog pattern has two sub-patterns： low trough pattern and uniform pressure field in front of low. These patterns, which cover nearly all PM10 class 3 pollution events in Liaoning, provide convenient basis for air quality forecast and effective control of air pollutants.