浑善达克沙地起沙率和起沙量的估计

Emistation on Dust Emission from Ground Surface in Hunshandake Sandland

利用起沙通量模式和地面起尘半经验方案,估算了浑善达克沙地春季地表的临界起沙风速及沙尘天气期间的起沙通量,以及地面尘排放总量及其平均年增长率。计算结果表明,浑善达克沙地2001年春季地表临界起沙风速为5.61 m.s-1,沙尘天气期间平均起沙通量为4.40×10-7g.cm-2.s-1;1999年该沙区起尘量约占我国北方起尘总量的2.4%,春季起尘占全年的57%;1986年和1999年起沙总量分别为3.73×105t.a-1和4.87×105t.a-1,其平均年增长率为2.07%。

Dust emission rate and threshold velocity on surface in spring of 2001 were estimated with the soil-derived dust emission model, and the amount of dust emitted into the atmosphere from surface was calculated with two US EPA formulas by inputing pre-processing pedological and climatical data in Hunshandake sandland. The results show that the dust emission threshold velocity is 5.61 m · s^-1 , and the mean dust emission rate is 4.40 10^-7g · cm^-1· s^-1 in Hunshandake sandland in spring of 2001. The total amount of emitted dust from surfaces in Hunshandake sandland is 3.73 10^5t · a^-1 in 1986 and 4.87 10^5t · a^-1 in 1999 respectively, and its annual mean increasing rate during this period is about 2.07%.