摘要
大量研究及统计数据表明,下垫面向大气输送的热量能够为沙尘暴天气的发生、发展提供能量并对其产生重要的影响。在对2006年1月至2007年5月间所发生的27次沙尘暴发生当日14:00地-气温差进行统计的基础上,对它们之间的联系及影响进行研究,分析了3种下垫面条件下沙尘暴的沙尘水平通量和沙尘质量体积浓度对地-气温差的响应,以期为预警预报和防治沙尘暴的提供科学依据。结果表明:①当地-气温差超过20℃时,绿洲内部的沙尘暴沙尘水平通量和沙尘质量体积浓度垂直变化规律将发生一定程度的改变,尤其是沙尘质量体积浓度,将随高度的增加降低。②绿洲内部沙尘暴沙尘质量体积浓度和沙尘水平通量的垂直变化规律较荒漠和荒漠-绿洲交错带对地-气温差敏感。
Most researches and statistical data showed that heat transport from underlying surface to the atmospheric provided energy to occurrence of sand storms and exerted important influence on it. From Jan. 2006 to May 2007, there were total 27 dust storms events occurred in the study area. Base on the statistic data of temperature difference between land surface and atmosphere in the dust storm days, we analyzed the influence of temperature difference to the vertical distribution characteristics of sand dust horizontal flux and mass-volume concentration. Results indicated that when the temperature difference exceeded 20 ℃, the vertical distribution of sand dust horizontal flux and mass-volume concentration in the oasis-underlying area would change to a certain degree, and the mass-volume concentration, especially, would decrease with the height; the vertical distribution of sand dust horizontal flux and mass-volume concentration oasisunderlying were more sensitive to the temperature difference than that in the desert area and the ecotone of desert-oasis.
出处
《中国沙漠》
CSCD
北大核心
2011年第3期655-660,共6页
Journal of Desert Research
基金
国家重点基础研究发展规划项目(2009CB421304)
国家自然科学基金项目(30960321
10772073)
国家自然科学基金中法合作研究项目(10811130470)
中央高校基本科研业务费专项资金项目共同资助
关键词
民勤
温差
沙尘暴
水平通量
沙尘浓度
Minqin
surface-atmosphere temperature difference
dust storm
horizontal flux
dust mass-volume concentration
