干旱区生态环境知识资源中心(Arid): 黄土高原半干旱区气溶胶光学特性季节变化特征

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	黄土高原半干旱区气溶胶光学特性季节变化特征
其他题名	Seasonal variation of aerosol optical properties at AERONET of the semi-arid region in Loess Plateau
	白鸿涛 1; 陈勇航 2; 王洪强 2; 张强1 ; 郭铌 1; 王胜 1; 潘鹄 2; 张萍 2
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2011
卷号	34 期号:2 页码:292-299
中文摘要	采用AERONET Version 2 Level 2.0气溶胶数据集,分析了光学厚度、Angstrom波长指数、粒子尺度体积谱分布(dV(r)/dlnr)、折射指数(n-ik)和单次散射反照率(omega_0)等大气气溶胶光学特性参数的季节变化特征以及光谱依赖性.结果表明:气溶胶特性参量均具有明显的季节变化且呈现出明显的受沙尘影响的特征,春季受沙尘影响最明显,光学厚度最大;冬季受采暖和沙尘的共同影响,光学厚度也较大.气溶胶粒子体积尺度谱分布的主要差别体现在粗模态粒子体积浓度上,粗模态体积浓度呈现明显的季节变化规律:春季>冬季>夏季>秋季,与粗细粒子体积浓度比和光学厚度变化一致,说明该地区光学厚度的季节变化主要是由于粗模态体积浓度不同造成的.另外,粗模态体积中值半径也存在明显的季节变化:冬季>秋季>夏季>春季.折射指数实部和气溶胶粗粒子体积浓度与光学厚度的季节变化规律一致,而折射指数虚部冬季最大,春季最小;单次散射反照率随季节的变化规律有很大不同,冬季最小,而春季最大,可能与气溶胶粒子尺度及其化学组成的综合作用有关
英文摘要	Semi-arid regions are defined as transition zones between arid and sub-humid belts where precipitation is less than the potential evaporation. Semi-arid lands, especially those located in mid-latitude inner continental regions, are some of the most sensitive areas to climate change. One of these regions is found in westem China. During the last few decades, warm winters and dry springs occurred more frequently in northwestern China where, with disturbances brought about by human activity, large areas of vegetation were destroyed, thus giving rise to anthropogenic dust emissions. Understanding how human activity and the resulting dust emissions affect aerosol optical properties in these semi-arid regions is an essential step for developing mitigation and adaptation strategies to climate changes in these transition areas. In order to monitor the global aerosol optical properties, the U.S.space agency NASA and its partners established a worldwide network of ground-based observationswhich is an international aerosol automatic monitoring network called AERONET (Aerosol Robotic Network).The sun and sky diffuse radiation was measured and thene the aerosol optical properties are retrieved by using the sun and sky scanning spectral radiation observations. The products from the AERONET direct sun and sky radiance measurements are retrived through a rigorous calibration, cloud mask processing, and quality control. In this paper, the impact of dust aerosols on the semi-arid climate of northwestem China was analyzed using Version 2 Level 2 dataset from the AERONET site located in the semi-arid region in Loess Plateau in China, which is named as Lanzhou_city site. The seasonal variation of parameters of atmospheric aerosol optical properties such as aerosol optical thickness, Angstrom exponent, volume sizedistribution (dV(r)/dlnr), refractiye index (n-ik)and sin gle scattering albedo (0)were analyzed. The results show that the optical properties of the dust aerosols and aerosols generated by human activities have become apparently great effect on the semi-arid climate zones in Loess Plateau in China, the aerosol optical thickness was the largest in spring as dust events occurred most frequently;the optical thickness was second large in winter as residence heating systems and dusts combined to affect on it;the optical depth reduced in summer and autumn as ram occurred relatively frequently and that cause the removing dusts from the atmosphere;the differences of aerosol particle volume size distribution during each season, ranging from 0.13-0.34 in spring,0.14-0.34 in winter,0.12-0.29 in summer and 0.14-0.31 in autumn, were mainly reflected in the volume concentration of coarse mode particles;the coarse mode volume concentrations showed significantly seasonal variation ranging from the largest to the fewest was in spring, winter summer arid autumn sequently and the particle volume.concentration ratio and optical thickness had the-same order of seasonal variation;that showed seasonal changes of the optical thickness for the region was mainly due to the volume concentration of coarse mode. In addition, the coarse mode volume median radius ranged from 1.80-3.35 in winter,1.79-3.51 in autumn,1.77-3.24 in summer and 1.32-2.80 in spring;also there were significantly seasonal changes ranging from winter, autumn, summer and spring;the order of seasonal variation of the reaipart of refractive index, aerosol concentration of coars.eparticle size and:optical thickness were the same while the imaginary part of refractive index was the largest in winter and the smallest in spring;the variation of single scattering albedo with the seasons was very different that was the smallest in winter andthe largest in spring;it might caused by the chemical compositions of aerosol particle size and theirs integrated effects
中文关键词	沙尘气溶胶 ; 光学特性 ; 季节变化
英文关键词	dust aerosol optical characteristics seasonal variation
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:4183737
来源机构	中国气象局兰州干旱气象研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226450
作者单位	1.中国气象局兰州干旱气象研究所, 兰州, 甘肃 730020, 中国; 2.东华大学环境科学与工程学院, 上海 201620, 中国
推荐引用方式 GB/T 7714	白鸿涛,陈勇航,王洪强,等. 黄土高原半干旱区气溶胶光学特性季节变化特征[J]. 中国气象局兰州干旱气象研究所,2011,34(2):292-299.
APA	白鸿涛.,陈勇航.,王洪强.,张强.,郭铌.,...&张萍.(2011).黄土高原半干旱区气溶胶光学特性季节变化特征.干旱区地理,34(2),292-299.
MLA	白鸿涛,et al."黄土高原半干旱区气溶胶光学特性季节变化特征".干旱区地理 34.2(2011):292-299.