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Yellow Sea and Bohai atmospheric aerosol satellite observations and time series analysis

Author: Yu
Tutor: LiZiZuo;JiYuQiang
School: First Institute of Oceanography of State Oceanic Administration
Course: Physical oceanography
Keywords: Yellow Sea and Bohai Sea Atmospheric aerosol EMD El Nin~ o index SST
CLC: X513
Type: Master's thesis
Year: 2010
Downloads: 60
Quote: 0
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Abstract


The atmospheric aerosol influences the climate by scattering and absorbing solar radiation, as well as cloud forming and its microphysics property. Aerosol is closely linked to human health and economy, especially in Chinese coastal area, where economy and industry grow fast. The study on the satellite observation and time series analysis of atmospheric aerosol in Yellow Sea and Bohai Sea, which can obtain its temporal and spatial distribution, trend, as well as the connection with other meteorological and hydrological factors, has a great significance.The monthly averaged standard MODIS data of atmospheric aerosol optical depth (AOD) from Yellow Sea and Bohai Sea(112~125°E,35~45°N), ranging from 2000~2009 are collected. The validity of data is proved by compared with AERONET data, designed accuracy is achieved. Variation of atmospheric aerosol specified by area of land-ocean/ocean is analyzed using Empirical mode decomposition (EMD), the time variation property and casualty is discussed together with El Nin~ o index and Sea Surface Temperature (SST) in the research area. The results show that the atmospheric aerosol optical depth mostly reaches the maximum value in June in land-ocean area,while the maximum value in ocean area appears in the time of April to July; In autumn and winter (from October to February), the atmospheric aerosol optical depth descends to its minimum; the sum of modes obtained by Emperical Mode Decomposition (EMD) whose characteristic period is more than one year shows a relatively high correlation with Southern Oscillation Index (SOI), and the phase is temporally 12 months ahead of SOI, which indicates that the atmospheric aerosol is influenced by global climate change. In Yellow Sea and Bohai Sea, the correlation coefficient between EMD based trends of atmospheric aerosol and SST in sea area without ice coverage in the whole year reaches 0.94; In a specifically selected area(38°-39°N,119°-120°E), the correlation coefficient betwend the two trends reaches as high as 0.99. The result shows SST and aerosol have the same ascending trend, which is dependent on the unique geographic location of the research area and the great amount of greenhouse gas produced by adjacent coastal industries.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Particulate pollutants
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