Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Seasonal variation of columnar aerosol optical properties and radiative forcing over Beijing, China
https://orcid.org/0000-0001-6570-0604
AbstractLong-term seasonal characteristics of aerosol optical properties and radiative forcing at Beijing (during March 2001–March 2015) were investigated using a combination of ground-based Sun/sky radiometer retrievals from the AERONET and a radiative transfer model. Aerosol optical depth (AOD) showed a distinct seasonal variation with higher values in spring and summer, and relatively lower values in fall and winter. Average Angstrom exponent (AE) in spring was lower than other seasons, implying the significant impact of dust episodes on aerosol size distribution. AE mainly distributed between 1.0 and 1.4 with an obvious uni-peak pattern in each season. The observation data showed that high AODs (>1.0) were clustered in the fine mode growth wing and the coarse mode. Compared to AOD, seasonal variation in single scattering albedo (SSA) showed an opposite pattern with larger values in summer and spring, and smaller ones in winter and fall. The highest volume size distribution and median radius of fine mode particles occurred in summer, while those of coarse mode particles in spring. The averaged aerosol radiative forcing (ARF) at the top of the atmosphere (TOA) in spring, summer, fall and winter were −33 ± 22 W m-2, -35 ± 22 W m-2, -28 ± 20 W m-2, and -24 ± 23 W m-2 respectively, and these differences were mainly due to the SSA seasonal variation. The largest positive ARF within atmosphere occurred in spring, implying strong warming in the atmosphere. The low heating ratio in summer was caused by the increase in water vapor content, which enhanced light scattering capacity (i.e., increased SSA).
HighlightsLong-term seasonal characteristics of aerosol optical properties and radiative forcing of urban Beijing were analyzed.Both AOD and AE showed significant but reasonable monthly, seasonal and annual variation.The urban aerosol in Beijing leaded positive ARF the atmosphere with an average magnitude of 57 W/m2.The HYSPLIT trajectories were originating from multiple source locations and had different effects on aerosol characteristics.
Seasonal variation of columnar aerosol optical properties and radiative forcing over Beijing, China
https://orcid.org/0000-0001-6570-0604
AbstractLong-term seasonal characteristics of aerosol optical properties and radiative forcing at Beijing (during March 2001–March 2015) were investigated using a combination of ground-based Sun/sky radiometer retrievals from the AERONET and a radiative transfer model. Aerosol optical depth (AOD) showed a distinct seasonal variation with higher values in spring and summer, and relatively lower values in fall and winter. Average Angstrom exponent (AE) in spring was lower than other seasons, implying the significant impact of dust episodes on aerosol size distribution. AE mainly distributed between 1.0 and 1.4 with an obvious uni-peak pattern in each season. The observation data showed that high AODs (>1.0) were clustered in the fine mode growth wing and the coarse mode. Compared to AOD, seasonal variation in single scattering albedo (SSA) showed an opposite pattern with larger values in summer and spring, and smaller ones in winter and fall. The highest volume size distribution and median radius of fine mode particles occurred in summer, while those of coarse mode particles in spring. The averaged aerosol radiative forcing (ARF) at the top of the atmosphere (TOA) in spring, summer, fall and winter were −33 ± 22 W m-2, -35 ± 22 W m-2, -28 ± 20 W m-2, and -24 ± 23 W m-2 respectively, and these differences were mainly due to the SSA seasonal variation. The largest positive ARF within atmosphere occurred in spring, implying strong warming in the atmosphere. The low heating ratio in summer was caused by the increase in water vapor content, which enhanced light scattering capacity (i.e., increased SSA).
HighlightsLong-term seasonal characteristics of aerosol optical properties and radiative forcing of urban Beijing were analyzed.Both AOD and AE showed significant but reasonable monthly, seasonal and annual variation.The urban aerosol in Beijing leaded positive ARF the atmosphere with an average magnitude of 57 W/m2.The HYSPLIT trajectories were originating from multiple source locations and had different effects on aerosol characteristics.
Seasonal variation of columnar aerosol optical properties and radiative forcing over Beijing, China
https://orcid.org/0000-0001-6570-0604
AbstractLong-term seasonal characteristics of aerosol optical properties and radiative forcing at Beijing (during March 2001–March 2015) were investigated using a combination of ground-based Sun/sky radiometer retrievals from the AERONET and a radiative transfer model. Aerosol optical depth (AOD) showed a distinct seasonal variation with higher values in spring and summer, and relatively lower values in fall and winter. Average Angstrom exponent (AE) in spring was lower than other seasons, implying the significant impact of dust episodes on aerosol size distribution. AE mainly distributed between 1.0 and 1.4 with an obvious uni-peak pattern in each season. The observation data showed that high AODs (>1.0) were clustered in the fine mode growth wing and the coarse mode. Compared to AOD, seasonal variation in single scattering albedo (SSA) showed an opposite pattern with larger values in summer and spring, and smaller ones in winter and fall. The highest volume size distribution and median radius of fine mode particles occurred in summer, while those of coarse mode particles in spring. The averaged aerosol radiative forcing (ARF) at the top of the atmosphere (TOA) in spring, summer, fall and winter were −33 ± 22 W m-2, -35 ± 22 W m-2, -28 ± 20 W m-2, and -24 ± 23 W m-2 respectively, and these differences were mainly due to the SSA seasonal variation. The largest positive ARF within atmosphere occurred in spring, implying strong warming in the atmosphere. The low heating ratio in summer was caused by the increase in water vapor content, which enhanced light scattering capacity (i.e., increased SSA).
HighlightsLong-term seasonal characteristics of aerosol optical properties and radiative forcing of urban Beijing were analyzed.Both AOD and AE showed significant but reasonable monthly, seasonal and annual variation.The urban aerosol in Beijing leaded positive ARF the atmosphere with an average magnitude of 57 W/m2.The HYSPLIT trajectories were originating from multiple source locations and had different effects on aerosol characteristics.
Seasonal variation of columnar aerosol optical properties and radiative forcing over Beijing, China
Yu, Xingna (Autor:in) / Lü, Rui (Autor:in) / Liu, Chao (Autor:in) / Yuan, Liang (Autor:in) / Shao, Yixing (Autor:in) / Zhu, Bin (Autor:in) / Lei, Lu (Autor:in)
Atmospheric Environment ; 166 ; 340-350
04.07.2017
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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