Spatial and seasonal variations of aerosols over China from two decades of multi-satellite observations. Part I: ATSR (1995–2011) and MODIS C6.1 (2000–2017)

Sogacheva, Larisa; Leeuw, Gerrit de; Rodríguez, Edith; Kolmonen, Pekka; Georgoulias, Aristeidis K.; Alexandri, Georgia; Kourtidis, Konstantinos; Proestakis, Emmanouil; Marinou, Eleni; Amiridis, Vassilis; Xue, Yong; A, Ronald van der

doi:10.5194/acp-2018-287

Cited by 6 publications

(8 citation statements)

References 22 publications

(33 reference statements)

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“…The reduction in AOD reported here is in agreement with changes over the same region or wider Chinese regions during recent years, reported based on different satellite sensors, e.g. MODIS and AATSR (Sogacheva et al, 2018) and MODIS and MISR (Zhao et al, 2017).…”

Section: Aerosol Characteristics and Changessupporting

confidence: 92%

Satellite observations of aerosols and clouds over South China from 2006 to 2015: analysis of changes and possible interactions

Benas

Meirink

Karlsson

et al. 2018

Preprint

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Abstract. Aerosol and cloud properties over South China during the 10-year period 2006&ndash;2015 are analysed based on observations from passive and active satellite sensors and emission data. The results show a decrease in aerosol optical depth over the study area by about 20% on average, accompanied by an increase in liquid cloud cover and cloud liquid water path (LWP) by 5% and 13%, respectively. Analysis of aerosol types and emissions suggests that the main driver for their reduction is a decrease in biomass burning aerosols. These changes occurred mainly in late autumn and early winter months and coincided with changes in cloud properties. For the latter, possible explanatory mechanisms were examined, including changes in circulation patterns and aerosol-cloud interactions. Further analysis of changes in aerosol vertical profiles demonstrates a consistency of the observed aerosol and cloud changes with the aerosol semi-direct effect, which depends on their relative heights. Based on this mechanism, less absorbing aerosols in the cloud layer would lead to an overall decrease in evaporation of cloud droplets, thus increasing cloud LWP and cover.

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Section: Aerosol Characteristics and Changessupporting

confidence: 92%

Satellite observations of aerosols and clouds over South China from 2006 to 2015: analysis of changes and possible interactions

Benas

Meirink

Karlsson

et al. 2018

Preprint

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“…This is because the progressive increase of air temperature from January to June will accelerate photochemical reactions and increase aerosol concentrations [40]. In addition, the dust aerosol transport from the arid and semi-arid regions also contributes to the increase in aerosol loading [24]. Although high relative humidity during summer months strengthens the local aerosol accumulation, East Asian summer monsoon rainfalls wash out aerosol particles and result in low AOD values over these regions.…”

Section: Seasonal Aod Changes In Urban Agglomerationsmentioning

confidence: 99%

“…Moderate resolution Imaging Spectroradiometer (MODIS) AOD is widely used to characterize the spatiotemporal change of atmospheric aerosols because it has been extensively validated and provides continuous observations extending for nearly two decades [14][15][16]. Numerous studies have used MODIS AOD to study the long-term spatiotemporal variation of aerosols at regional and global scales [17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al (2017) investigated inter-annual AOD trends during 2001-2015 over Eastern and Central China using observations from Multi-angle Imaging SpectroRadiometer (MISR) and MODIS [31]. Sogacheva et al (2018) analyzed the spatial patterns and inter-annual and seasonal variations of AOD over China based on one-degree Level 3 monthly AOD data retrieved from AlongTrack Scanning Radiometer (ATSR -2, 1995-2002) and Advanced ATSR (AATSR, 2002(AATSR, -2012 and Level 3 Terra MODIS merged Dark Target and Deep Blue (DTDB) AOD product (2000-2017) [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Time Scale Analysis of Regional Aerosol Optical Depth Changes in National-Level Urban Agglomerations in China Using Modis Collection 6.1 Datasets from 2001 to 2017

Zhang

Yao

2019

Remote Sensing

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With the rapid development of China’s economy and industry, characterizing the spatial and temporal changes of aerosols in China has attracted widespread attention from researchers. The national-level urban agglomerations are the most concentrated areas of China’s economic, population and resource. Studying the spatial and temporal changes of aerosol optical depth (AOD) in these regions has practical guiding significance for effective monitoring of atmospheric particulate pollution. This paper analyzed the spatial and temporal variations of AOD in China’s urban agglomerations during 2001–2017 by using Terra Moderate resolution Imaging Spectroradiometer (MODIS) Collection 6.1 (C6.1) Level 2 aerosol products (MOD04_L2). Five national-level urban agglomerations were chosen: Yangtze River Delta (YRD), Pearl River Delta (PRD), Beijing-Tianjin-Hebei (BTH), Yangtze River Middle-Reach (YRMR) and Cheng-Yu (CY). We analyzed the change patterns of AOD in different urban agglomerations at multi-time scales and built a time series decomposition model to mine the long-term trend, seasonal variation and abnormal change information of AOD time series. The result indicated that averaged AOD values in the five urban agglomerations were basically increased first and then decreased at the annual time scale during 2001–2017. The averaged AOD showed strong seasonal differences and AOD values in spring and summer were typically higher than those in autumn and winter. At the monthly time scale, the AOD typically varied from low in cold months to high in warm months and then decreased during the rainy periods. Time series decompositions revealed that a notable transition around 2007–2008 dominated the long-term overall trend over the five selected urban agglomerations and an initial upward tendency followed by a downward tendency was observed during 2001–2017. This study can be utilized to provide decision-making basis for atmospheric environmental governance and future development of urban agglomerations.

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“…Yu et al [48] compared AOD values in East Asia during 2001-2005, and found higher values at Chinese sites than at Korean or Japanese sites. Khan et al [49] reported a decreasing trend in AOD at 440 nm over the North China Plain, with Beijing showing the highest values from 2001 to 2018; however, some studies have reported that the annual mean AOD has remained constant or increased over Northeast Asia and China [50][51][52]. Nam et al [50] found the highest annual mean AOD at North China sites and lower values at Korean and Japanese sites.…”

Section: Discussionmentioning

confidence: 99%

Long-Term Variation of Black Carbon Absorption Aerosol Optical Depth from AERONET Data over East Asia

2020

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Absorption aerosol optical depth induced by black carbon (AAODBC) was retrieved using the depolarization ratio and single scattering albedo provided by the Aerosol Robotic Network (AERONET) inversion products over East Asia. Our analysis considered AERONET data from six sites in East Asia that are mostly affected by anthropogenic pollution, black carbon (BC) emissions, and natural mineral dust, during the period 2001–2018. We identified a rapid reduction in total aerosol optical depth (AODT) of −0.0106 yr−1 over Beijing, whereas no considerable trend was observed at the Korean and Japanese sites. The long-term data for AAODBC showed decreasing trends at all sites. We conclude that successful emission control policies were the major underlying driver of AODT and AAODBC reductions over East Asia, particularly in China, during the study period. Values of the AAODBC/AODT ratio revealed that, although these policies were successful, the Chinese government needs to undertake stricter measures toward reducing BC emissions. We found that AAODBC follows seasonal trends, peaking in the colder months. This suggests that in East Asia, particularly in China, domestic coal burning is still of concern.

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Spatial and seasonal variations of aerosols over China from two decades of multi-satellite observations. Part I: ATSR (1995–2011) and MODIS C6.1 (2000–2017)

Cited by 6 publications

References 22 publications

Satellite observations of aerosols and clouds over South China from 2006 to 2015: analysis of changes and possible interactions

Satellite observations of aerosols and clouds over South China from 2006 to 2015: analysis of changes and possible interactions

Multi-Time Scale Analysis of Regional Aerosol Optical Depth Changes in National-Level Urban Agglomerations in China Using Modis Collection 6.1 Datasets from 2001 to 2017

Long-Term Variation of Black Carbon Absorption Aerosol Optical Depth from AERONET Data over East Asia

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