挥发性酚含量年际变化趋势为1998 ~ 2000年呈上升趋势,2000 ~ 2005年呈下降趋势。
The annual variation of volatile phenol concentrations presented rising trend from 1998 to 2000, and downtrend from 2000 to 2005.
“人们通常关注年平均温度,这个数值可以给年份排序,但是这种排序经常没有意义”,GISS所长 Jams Hansen说道 "热带厄尔尼诺--拉尼娜现象的循环造成了全球气温的巨大年际变化, 当把5年或十年的气温平均看,我们就会发现全球变暖的趋势有增无减。"
"When we average temperature over five or ten years to minimise that variability, we find global warming is continuing unabated," Hansen concluded.
科学家们过去认为南极洲上大规模臭氧层年际变化会掩盖住微小的趋势。
Scientists thought large, wholly natural, year-to-year variations in Antarctic ozone would obscure any small upward trend.
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