摘要
持续时间大于t的沙尘暴次数N满足lgN=a-bt(即LH现象)。文中分析了黄土高原四季沙尘暴持续时间。平均持续时间:春季126.5分钟,冬季113分钟,秋季95分钟,夏季51.9分钟;春季、秋季和冬季满足LH现象,拟合的b值:春季0.1634 hr-1,秋季0.2043 hr-1,冬季0.1707 hr-1。夏季例外,但在t≤8hr也满足LH现象,拟合的b值为0.2639 hr-1。
The number of dust storms（ N） with the duration greater than t,is obeyed by lgN = a- bt,i. e.,LH phenomenon. The dust storm durations in Loess Plateau were analyzed. The mean duration of dust storm was126. 5 min for spring,51. 9 min for summer,95. 9 min for autumn and 113. 6 min for winter,respectively. The duration distribution of dust storm for spring,autumn and winter obeyed the LH phenomenon and with b value of0. 1634 hr- 1,0.2043 hr- 1,0.1707 hr- 1,respectively. For summer,the duration distribution of dust storm was different from the LH phenomenon,but while t ≤ 8h the duration distribution obeyed LH phenomenon and with b value of 0. 2639 hr- 1.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2015年第1期145-148,共4页
Journal of Arid Land Resources and Environment
关键词
黄土高原
沙尘暴
持续时间
分布
B值
Loess Plateau
dust storm
duration
distribution
b value
