城市气溶胶光学厚度空间格局特征多指标综合分析
作者简介:赵小锋(1981-),男,博士,副研究员,主要从事城市环境遥感与GIS。E-mail: xfzhao@iue.ac.cn
收稿日期: 2017-12-04
要求修回日期: 2017-12-26
网络出版日期: 2018-03-20
基金资助
国家自然科学基金项目(41371392、71573242、71273252)
Multi-index Analysis of Spatial Patterns of Urban Aerosol Optical Depth
Received date: 2017-12-04
Request revised date: 2017-12-26
Online published: 2018-03-20
Supported by
National Natural Science Foundation of China, No. 41371392, 71573242, 71273252.
Copyright
本文以厦门市为例,基于MODIS影像反演的大气气溶胶光学厚度(AOD),利用空间自相关和景观格局指数从数量、形态和结构方面综合分析了2014年各月份(5月和9月除外)AOD时空格局变化。结果表明,研究区AOD具有明显的时空分布差异,林地上空的AOD处于较低等级,建设用地上空AOD大部分处于中高等级;AOD在春夏季较大,在秋冬季较小。AOD分布存在显著正空间自相关性,而且主要存在高高(HH)、低低(LL)、高低(HL)3种聚集模式。低低聚集模式主要分布在厦门市的北部山区;高高(HH)和高低(HL)模式主要分布在本岛东北部新城和本岛外各新城的城区。在景观格局指数方面,从秋冬季节到春夏季节期间,研究区气溶胶光学厚度高等级斑块增加,景观结构趋于复杂,景观异质性增加。对AOD时空格局变化进行多指标综合分析可以更加深入、细致、全面地刻画气溶胶的变化规律,有助于精确评估气溶胶对环境、气候等的影响,为城市可持续发展提供决策支持。
赵小锋 , 刘嘉慧 , 赵颜创 , 王菲菲 , 李桂林 . 城市气溶胶光学厚度空间格局特征多指标综合分析[J]. 地球信息科学学报, 2018 , 20(3) : 360 -367 . DOI: 10.12082/dqxxkx.2018.170588
In this study, a time series of MODIS -Aqua images were used to retrieve the atmospheric aerosol optical depth (AOD) of Xiamen City. Then, the spatio-temporal variations of AOD in different months of the year 2014/2015 except May and September were analyzed in respect of quantity, spatial configuration and structure, respectively. The analysis was implemented by integrating multiple indexes related to spatial autocorrelation and landscape metrics. The results showed that distribution of AOD had obvious spatial and temporal variations in the study area. The low-AOD patches were dominant over forests, while middle/high-AOD patches were dominant over built-up areas. The AOD showed significant seasonal variations, which increased in spring and summer and decreased in autumn and winter. The spatial clustering pattern of AOD, characterized by the indexes related to spatial autocorrelation, showed that low-low (LL) clustering pattern was in the northern mountains of the mainland, while high-high (HH) and high-low (HL) clustering patterns were in the newly developed northeast urban area of Xiamen Island and the urban areas of the mainland satellite towns along the coast. In terms of landscape metrics, high-AOD patches increased from autumn and winter to spring and summer, accompanied by an increase of both complexity and heterogeneity of the landscape structure. It is a useful tool to unfold more thorough, detailed and comprehensive description of the characteristics of AOD variation by using the multi-index analysis. Results of this study can help to assess the impact of aerosol on environment and climate, and provide decisions supporting for the sustainable development of cities.
Fig. 1 The study area of Xiamen city图1 厦门市位置图 |
Tab. 1 The MODIS -Aqua images used in this study表1 本研究所使用的卫星数据 |
月份 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
数目/幅 | 5 | 1 | 3 | 5 | 0 | 1 | 1 | 2 | 0 | 9 | 3 | 7 |
Fig. 2 Spatial distribution of AOD over Xiamen city in different months of the year from Mar. 2014 to Feb.2015图2 2014年3月-2015年2月厦门各月大气气溶胶光学厚度空间分布 |
Tab. 2 Thresholds used in the segmentation表2 密度分割所使用的阈值 |
气溶胶光学厚度值范围 | 风险等级 | 代表意义 |
---|---|---|
0-0.5 | 1 | 低 |
0.5-1.0 | 2 | 较低 |
1.0-1.5 | 3 | 中 |
1.5-1.7 | 4 | 高 |
>1.7 | 5 | 较高 |
Fig. 3 The descriptive statistics of monthly AOD over Xiamen city图3 厦门各月大气气溶胶光学厚度统计信息 |
Fig. 4 Moran’s I and Z values of AOD over Xiamen city in different months图4 厦门各月份大气气溶胶光学厚度的全局自相关系数和Z值 |
Fig. 5 Anselin Local Moran’s I of AOD over Xiamen city in different months of the year from 2014 to 2015图5 2014年3月至2015年2日研究区各月份气溶胶光学厚度局部自相关聚类图 |
Fig. 6 Changes of AOD landscape metrics over Xiamen city图6 厦门大气气溶胶景观指数的变化 |
The authors have declared that no competing interests exist.
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