摘要
对祁连山敦德冰心总微粒含量、粒径分布以及总微粒含量、粗微粒含量与沙尘暴的关系进行了分析，结果表明，微粒主要来源于亚洲粉尘发源地和区域性源地，属于典型的陆源微粒。微粒含量和微粒粒径变化反映了沙尘暴的强度和波动历史，沙尘暴频率高时，微粒含量高，微粒粒径大，反之，微粒含量低，微粒粒径小。末次冰期以来，微粒含量变化呈减少趋势，暖期微粒含量低，冷期微粒含量高，夏季微粒含量高，冬季微粒含量低；不同粒径微粒相关性良好，反映了它们在来源、沉积和冰内变化方面具有相同之处。
In this paper,microparticle amount,size profile and dust storms are studied.Different sizes of microparticles,which originated from Asian dust and regional source area,have a good positive relationship,which suggests they are similar in progress of deposition and internal variation.They are typical continental microparticles.Total,small,middle and large microparticle concentrations are decreasing from LGS to present,but in the course of change,they don’t show that they are linear but vibrational.Microparticle concentration is high during warm periods and spring summer season,and it is low during cold periods and winter season.There are also good relationships between microparticles and dust storms.When frequency of dust storms is increasing,microparticle concentration is increasing and so is microparticle size,and vice verse.Because different sizes of microparticles are different in altitude,distance and time,the origin of microparticle is primarily showed in three aspects:the largest one originates from the front of bare glacier,the middle one from local and regional mixture layer of the lower atmosphere,and the small one from atmospheric troposphere.Therefore,microparticle concentration and size varied,which reflected the intensity of winter monsoon.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1999年第3期105-113,共9页
Marine Geology & Quaternary Geology
基金
中国科学院重大项目
关键词
总微粒含量
微粒粒径
沙尘暴
大气环境
敦德冰心
Dunde Ice Core
microparticle concentration
size
dust storms
atmospheric environment
