太湖梅梁湾冬季水-气界面二氧化碳通量日变化观测研究

Diurnal variation of carbon dioxide flux on water-air interface of Meiliang Bay,Taihu Lake in wintertime.

应用静态箱式法对太湖梅梁湖区冬季(2003年12月23日8:00～26日6:00)的水气界面CO2通量进行了昼夜连续观测,共测得60组数据,分析了梅梁湾湖区CO2通量的冬季日变化规律.结果表明,在光照条件较好,风速较小情况下,白天梅梁湾湖区为CO2的汇,极大值出现在14:00时,其平均CO2通量为-3.01 mg·m-2·h-1;夜间梅梁湾湖区CO2通量值为-0.897～1.006 mg·m-2·h-1,其平均通量为-0.02 mg·m-2·h-1;在阴天、风速较大时,湖区CO2通量日变化与前面有较大差异,表现为CO2的强源,最大CO2通量达到76.53 mg·m-2·h-1.

Employing statistic box method, this paper monitored 72 h continuously the diurnal variation of carbon dioxide flux on the water-air interface of Meiliang Bay, Taihu Lake in wintertime. The results showed that in clear and breezy days, water was the sink of atmospheric carbon dioxide at daytime, and its carbon dioxide flux was about zero at night, with the mean values of carbon dioxide flux being - 3.01 and - 0.02 mg·m^-2·h^-1, respectively. But, in cloudy days and after a durative gale, water was a strong source of atmospheric carbon dioxide, with the maximum value 76.53 mg·m^-2·h^-1. It could be concluded that wind speed had a significant effect on CO2 flux in wintertime.