globalchange  > 气候减缓与适应
DOI: 10.1002/joc.5446
论文题名:
Spatial variations and trends in AOD climatology over East Africa during 2002–2016: a comparative study using three satellite data sets
作者: Boiyo R.; Kumar K.R.; Zhao T.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38
起始页码: e1221
结束页码: e1240
语种: 英语
英文关键词: aerosol-type classification ; AOD ; East Africa ; MISR ; MODIS ; spatial trends
Scopus关键词: Atmospheric aerosols ; Climate change ; Radiometers ; Satellite imagery ; Spectrometers ; Supercomputers ; Weather satellites ; Aerosol types ; East Africa ; MISR ; MODIS ; Spatial trends ; Aerosols ; aerosol ; climatology ; comparative study ; data set ; MISR ; MODIS ; optical depth ; satellite data ; spatial distribution ; spatial variation ; temporal distribution ; trend analysis ; East Africa
英文摘要: Aerosol optical depth (AOD) has become one of the most crucial parameters for climate change assessment. This study presents long-term (2002–2016) spatio-temporal distributions and trends in AOD over East Africa (EA) retrieved from the moderate-resolution imaging spectroradiometer (MODIS) Aqua [Dark Target (DT) and Deep Blue (DB)] and multi-angle imaging spectroradiometer (MISR). An inter-comparison of AODs retrieved from different algorithms noticed significant positive correlations (r = 0.72 − 0.87) with MISR underestimating MODIS. Moderate (>0.5–0.8) to high (≥0.8) correlations in AOD exhibited over EA, with a few regions representing low (0–0.5) positive correlations. The spatial patterns of annual mean AOD were generally characterized by low (<0.2), moderate (0.2–0.35) and high (>0.35) centres over EA. The seasonal mean AODs over EA were found high (low) during the local dry (wet) seasons, with annual mean (±σ) values of 0.20 ± 0.01, 0.18 ± 0.01 and 0.20 ± 0.02 as observed by DT, DB and MISR, respectively. A single peak distribution of frequencies in AOD was observed by the three sensors in the interval 0.1–0.2, signifying a generally less polluted environment dominated by particular aerosol type. Linear trend analysis revealed an increase in AOD by 0.52, 0.57 and 0.74% year−1 as detected by MISR, DT and DB, respectively, and were consistent with those noted in key meteorological parameters. Furthermore, annual and seasonal spatial trends and tendencies revealed a general increase in AOD over EA, being positive and significant over the northern part of EA. Later, classification of major aerosol types over major cities in EA revealed dominance of continental (74.47%) followed by the mixed (16.22%) and biomass-burning/urban-industrial (8.02%) aerosols, with minor contributions from desert dust (1.03%) and clean maritime (0.32%) type of aerosols. © 2018 Royal Meteorological Society
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116955
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作者单位: Collaborative Innovation Centre on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), International Joint Laboratory on Climate and Environment Change (ILCEC), Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing, China; Department of Physical Sciences, Meru University of Science and Technology, Kenya

Recommended Citation:
Boiyo R.,Kumar K.R.,Zhao T.. Spatial variations and trends in AOD climatology over East Africa during 2002–2016: a comparative study using three satellite data sets[J]. International Journal of Climatology,2018-01-01,38
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