摘要
本文利用蒙古25个台站的52年逐月降水量资料,研究了蒙古旱涝变化和降水趋势。结果表明:蒙古平均年降水量为216.1mm,分布由南向北增加,东西部少,中部多,南部和西部为干旱区,中部和东部为半干旱区,与我国干旱半干旱区是一个整体。降水主要集中在夏季;年降水量变率为15.6％—38.0％。蒙古旱涝都很频繁,旱的频率高于涝的频率,而大涝的频率是大旱的两倍。年降水量服从正态分布,并有准3年和11—14年周期。52年来年降水量以0.34 mm/10年的速率增加,有明显的阶段性。八十年代降水量增加速率,为5.13 mm/年;进入九十年代继续增加。
In this paper, drought, flood and precipitation trend are studied by using month by month precipitation data for last 52 years(1940-1991 ) at 25 stations in Mongolia. The results show: mean annual precipitation is 216.1 mm, southern and western parts are arid zone, middle and eastern parts are semi-arid zone; annual precipitation variability is 15.6%-38.0%. It is shown that both drought and flood are very frequent in Mongolia. The frequency of drought is higher then the flood, the frequency of severe flood is the two times of the severe drought. Annual precipitation distribution is normal distribution, and it has the quasi-three years and 11-14 years periods. Annual precipitation increases about 0.34 mm / decade years. Annual precipitation increases in the rate of 5.13 mm/year in 1980's and it continue increases in 1990's.
出处
《高原气象》
CSCD
北大核心
1993年第4期450-457,共8页
Plateau Meteorology
基金
中科院KY85-10项目资助
关键词
蒙古
降水量
旱涝
降水
Mongolia
Precipitation
Drought and flood trend.
