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地-气温差对沙尘源区不同下垫面沙尘输运结构的影响

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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.
Relationship between Sand Dust Transportation and Land Surface-Atmosphere Temperature Difference at Different Land Surface in Dust Source Areas
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 oasis-underlying were more sensitive to the temperature difference than that in the desert area and the ecotone of desert-oasis.

Minqinsurface-atmosphere temperature differencedust stormhorizontal fluxdust mass-volume concentration

詹科杰、赵明、杨自辉、方峨天、郭树江、王强强、王多泽

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兰州大学,甘肃兰州730000

甘肃省治沙研究所,甘肃兰州730070

甘肃省林业科学研究院,甘肃兰州730000

民勤 温差 沙尘暴 水平通量 沙尘浓度

国家重点基础研究发展规划(973计划)国家自然科学基金国家自然科学基金国家自然科学基金中法合作研究项目中央高校基本科研业务赞专项资金项目共同资助

2009CB421304309603211077207310811130470

2011

中国沙漠
中国科学院寒区旱区环境与工程研究所

中国沙漠

CSTPCDCSCD北大核心
影响因子：1.504
ISSN：1000-694X
年,卷(期)：2011.31(3)
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