东海海域春季降水的化学特征

CHEMICAL CHARACTER OF SPRING PRECIPITATION OVER THE EAST SEA REGION

根据１９９４年４月１７日—２７日东海海域（１２２５°—１２９５°Ｅ，２９°—３２°Ｎ）的降水雨样化学组份分析，并将其与我国上海及日本西海岸的降水化学组份进行了对比，认为东海海域的降水酸化与陆地源污染的输送有关：在东南风系作用下，降水受东南海上气团影响，从上海以东到日本以西的广阔的海域中，降水呈弱酸或中性，其化学组份表现为海洋化学的特征；在东北风系作用下，东海海域的降水主要受朝鲜半岛和日本方面污染源的影响，降水中ＳＯ２－４非海盐浓度比东南风系时明显增加，降水酸化，其降水的化学特征和中国上海明显不同，与日本西海岸的降水相似．

Based on chemical analysis of precipitation samples collected from the ocean region of East Sea of China (122.5°—129.5°E,29°—32°N) from 17th—27th, April, 1994, the chemical character of precipitation was discussed. It was shown that under southeast wind system the precipitation influenced by air mass from southeast ocean is slightly acid or non-acid and the chemical composition has a characteristics of marine chemistry. Under northeast wind system, however,the precipitation is quite acidic which mainly influenced by pollution sources of Korea Peninsula and Japan. The SO_4~2-concentration of non-sea-salt in the precipitation under northeast wind system is higher than that under southeast wind system. The chemical characteristics is similar to that in the West Cost of Japan.