Different trends in extreme and median surface aerosol extinction coefficients over China inferred from quality-controlled visibility data
Different trends in extreme and median surface aerosol extinction coefficients over China inferred from quality-controlled visibility data
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根据质量控制能见度数据推断中国地表气溶胶消光系数极值和中值的不同趋势
DOI：
10.5194/acp-18-3289-2018
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发表时间：
2017-10
影响因子：
6.3
通讯作者：
Zhao Chunsheng
中科院分区：
文献类型：
--
作者：
Li Jing;Li Chengcai;Zhao Chunsheng
抽象的。虽然气溶胶性质的时间变化已经被
广泛调查，大多数研究都集中在平均条件下，
非常强调极端。然而，后者可能更重要，
从人类健康和气候变化的角度来看。这项研究使用了以前的
经过验证的、质量受控的可见性数据集，
极端地面气溶胶的趋势（以相对变化表示）
消光系数（AEC），并将其与中值进行比较
趋势使用两种方法独立评估趋势，
达到一致的结果。极端和中间趋势的迹象是
一般是连贯的，而它们的大小显示出不同的空间和
时间差异。在1980年代，发现了一个总体上积极的趋势
全国各地的极端趋势超过平均趋势，除了
中国西北和华北平原。20世纪90年代，东北部的AEC
中国西北地区开始衰落，而中国其他地区仍然
表现出增长。极端趋势继续在南部占主导地位
而在北方，它们屈服于平均趋势。2000年之后，
趋势变得弱于平均趋势整体而言，
重要性和重要性水平。年度趋势主要是
冬季和秋季的趋势。结果表明，
中国污染的变化可能受到不同机制的控制。
经常导致极端空气质量变化的天气条件可能
在20世纪80年代占主导地位，而排放量的增加可能是
2000年代的主要因素。
Abstract. Although the temporal changes in aerosol properties have been
widely investigated, the majority of studies has focused on average conditions without
much emphasis on the extremes. However, the latter can be more important in
terms of human health and climate change. This study uses a previously
validated, quality-controlled visibility dataset to investigate the long-term
trends (expressed in terms of relative changes) in extreme surface aerosol
extinction coefficient (AEC) over China and compares them with the median
trends. Two methods are used to independently evaluate the trends, which
arrive at consistent results. The signs of extreme and median trends are
generally coherent, whereas their magnitudes show distinct spatial and
temporal differences. In the 1980s, an overall positive trend is found
throughout China with the extreme trend exceeding the mean trend, except for
northwest China and the North China Plain. In the 1990s, AEC over northeast
and northwest China started to decline while the rest of the country still
exhibited an increase. The extreme trends continued to dominate in the south
while they yielded to the mean trend in the north. After the year 2000, the extreme
trend became weaker than the mean trend overall in terms of both the
magnitude and significance level. The annual trend can be primarily
attributed to winter and fall trends. The results suggest that the decadal
changes in pollution in China may be governed by different mechanisms.
Synoptic conditions that often result in extreme air quality changes might
have dominated in the 1980s, whereas emission increase might have been the
main factor for the 2000s.
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探究北京冬季严重雾霾：天气天气、区域交通和异质反应的影响
影响因子：
6.3
作者：
Zheng G. J.;Duan F. K.;Su H.;Ma Y. L.;Cheng Y.;Zheng B.;Zhang Q.;Huang T.;Kimoto T.;Chang D.;Poeschl U.;Cheng Y. F.;He K. B.
通讯作者：
He K. B.
DOI：
10.2307/1402637
发表时间：
1949-12
期刊：
--
影响因子：
--
作者：
M. Kendall
通讯作者：
M. Kendall
影响因子：
5.2
作者：
Che, Huizheng;Zhang, Xiaoye;Qu, John J.
通讯作者：
Qu, John J.
影响因子：
6.3
作者：
J. Yoon;W. V. Hoyningen-Huene;M. Vountas;J. Burrows
通讯作者：
J. Yoon;W. V. Hoyningen-Huene;M. Vountas;J. Burrows
DOI：
10.1007/978-1-4684-6683-6_9
发表时间：
1981
期刊：
--
影响因子：
--
作者：
R. Forthofer;R. Lehnen
通讯作者：
R. Forthofer;R. Lehnen