全球气候变暖条件下沈阳若干气候特征的变化

Change of Some Climate Characteristic in Shenyang Under Global Warming Condition

沈阳地处全球气候变化的敏感带,在近百年中,沈阳冬季气温升高约1.7℃。沈阳气温升高引起了当地多种与农事活动有关的气候现象变化:农耕期近50年增加6日左右,作物主要营养生长期冷害减少,但夏季低温变化不大;初霜日期自1980年代起总体明显推迟,终霜日期提前;冬暖使得蔬菜大棚生产规模扩大;同时,春季第一场透雨日期推后,1980年代后春旱的次数明显增多,但大涝年减少。另外,对农田水分蒸发影响很大的春季大风日数明显减少。对农业生产而言,在全球气候变暖背景下,沈阳地区的这些气象要素变化似乎是利大于弊。

Shenyang locates the sensitive zone of global climate change. In recent 100 years, the temperature has raised 1.7℃, and it has brought many local climate phenomenon change which relates to the agronomic activities. The cultivate period increased 6 days in recent 50 years, cold harm in the period of main crop nutrition reduced, but the change of low temperature in summer wasnrt obvious, the first frost date obviously delayed and the latest frost was far in advance from 1980＇s, the date of the first stronger rain in spring delayed, the times of spring drought increased, but flood years reduced, the days of spring gale day number obviously decreased. Winter warming has caused the warming house vegetable production better. General speaking, the meteorological element changes in Shenyang are to benefit to agriculture production.