典型背景点降水化学组份的分析

ANALYSIS OF CHEMICAL COMPOSITION OF PRECIPITATION IN TYPICAL BACKGROUND SITE

在全球背景降水的三种类型背景点中，海洋型背景降水受海洋大气环流控制，化学组份来源于海洋气溶胶，内陆与海洋相间型背景降水的化学组份主要来源于海洋气溶胶与内陆大气污染物，内陆型大气背景降水的化学组份则主要来源于杨尘和内陆大气传输。

Background precipitation in the whole world is divided into ocean type,continent type and ocean alternative with continent type. Taking Amsterdam in pacific ocean and St. George in Atlantic ocean as example,we studied that ocean type background precipitation is controlled by ocean atmospheric circulation, its chemical compositions come from ocean aerosol.We also analyzed that chemical compositions of background precipitation in Katherine,Australia, ocean alternating with continent type, are mainly from ocean aerosol and continental atmospheric pollutants transfer,correlativity between them are also studied as well. But in Lijiang ,China,continent type,Chemical compositions of atmosphcric background precipitation arc mainly comc from fly ash and continental atmospheric transfer, and haven’t obvious correlativity with ocean aerosol.