典型背景点降水化学组份的分析

ANALYSIS OF CHEMICAL COMPOSITION OF PRECIPITATION IN TYPICAL BACKGROUND SITE

全球背景降水划分为海洋型、内陆型和海洋与内陆相间型三种.以太平洋的Amsterdam和大西洋的St.Georges为例,研究了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.分析了澳大利亚Katherine海洋与内陆相间型,背景降水化学组份主要来源于海洋气溶胶和内陆大气污染物传输两者的相关性.而内陆丽江大气背景降水化学组份主要来源于扬尘和内陆大气传输,与海洋气溶胶无显著相关性.

Background precipitation in the whole world is divided into ocean type, continent type and ocean alternating with continent type. Taking Amsterdam in Pacific ocean and St. Georges 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 atmospheric background precipitation are mainly come from fly ash and continental atmospheric transfer,and haven't obvious correlativity with ocean aerosol.