Terra和Aqua衛(wèi)星MODIS 3 km AOD與北京PM<sub>2.5</sub>對比分析

doi:10.3969/2015jms.0086

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Terra和Aqua衛(wèi)星MODIS 3 km AOD與北京PM2.5對比分析
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                        10.3969/2015jms.0086
                    
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基金項目:國家自然科學基金資助項目（41275128）

Comparative analysis between hourly PM_2.5 concentration and MODIS 3 km aerosol optical depth derived from Terra and Aqua satellites in Beijing

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本文利用2014年全年北京市12個空氣質(zhì)量監(jiān)測站的逐小時PM_2.5地面觀測資料，以及Terra衛(wèi)星和Aqua衛(wèi)星的MODIS 3 km氣溶膠光學厚度（AOD）產(chǎn)品，分析了地面PM_2.5和兩顆衛(wèi)星AOD的時空分布特征，并在時空匹配的基礎(chǔ)上，建立了AOD與PM_2.5濃度之間的回歸模型。結(jié)果表明：PM_2.5濃度在城區(qū)高、郊區(qū)低，最低值位于定陵站，城區(qū)站和郊區(qū)站的逐時PM_2.5濃度的日變化分別呈“雙峰型”和“單峰型”；兩顆衛(wèi)星AOD數(shù)值也均是城區(qū)高、郊區(qū)低，沿山區(qū)的邊界有明顯的AOD梯度，且城區(qū)上午Terra衛(wèi)星的AOD高于下午Aqua衛(wèi)星的AOD，而郊區(qū)上、下午的AOD基本相同；Aqua衛(wèi)星AOD與PM_2.5的確定系數(shù)（R²）較Terra衛(wèi)星AOD與PM_2.5的確定系數(shù)平均高0.11，且城區(qū)站點兩顆衛(wèi)星AOD與PM_2.5相關(guān)性均較郊區(qū)站點AOD與PM_2.5相關(guān)性偏高；綜合來看，Aqua衛(wèi)星的AOD與城區(qū)的PM_2.5相關(guān)系數(shù)最高，即Aqua衛(wèi)星的AOD更適于監(jiān)測和反演城區(qū)地面的PM_2.5。

Abstract:

By using the hourly PM_2.5 surface observation data from 12 air quality monitoring stations in Beijing of 2014 and the Aerosol Optical Depth (AOD) products at 3 km, the spatial and temporal distribution characteristics of surface PM_2.5 and AOD of two satellites were analyzed, moreover, based on the spatial matching, the regression model of PM_2.5 versus AOD was established. Results show that the PM_2.5 concentration is higher in downtown region than that in suburban region while the lowest value appears in Dingling station. The daily variation of PM_2.5 concentration shows bimodal and unimodal pattern in urban areas and suburban areas, respectively. The spatial distribution characteristics of AOD are similar to those of PM_2.5 concentration, there is significant AOD gradient along the mountainous border. The AOD of Terra in the mornings are larger than those of Aqua in the afternoons in the urban, but in the suburbs, both of the AODs are essentially the same. The determination coefficient(R²) between AOD of Aqua and PM_2.5 concentration is 0.11 higher than that between AOD of Aqua and PM_2.5 concentration, and the average coefficients of determination (R²) between AOD of Aqua and Terra and PM_2.5 concentration in urban stations are higher than those in suburban stations. Comprehensively, the correlation coefficient of AOD of Aqua and PM_2.5 is the highest in urban areas, which means that Aqua satellite is more adaptive to monitor and inverse ground-level PM_2.5 in urban areas.

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王偉齊,張成網(wǎng),臧增亮,王體健,尤偉. Terra和Aqua衛(wèi)星MODIS 3 km AOD與北京PM_2.5對比分析.氣象科學,2017,37(1):93-100 WANG Weiqi, ZHANG Chengwang, ZANG Zengliang, WANG Tijian, YOU Wei. Comparative analysis between hourly PM_2.5 concentration and MODIS 3 km aerosol optical depth derived from Terra and Aqua satellites in Beijing. Journal of the Meteorological Sciences,2017,37(1):93-100

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收稿日期:2015-10-29
最后修改日期:2015-11-24
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在線發(fā)布日期: 2017-03-07
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