Optical properties of aerosol particles in the atmospheric boundary layer in regions with and without sea ice
Autor: | Seizi Koga |
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Rok vydání: | 2021 |
Předmět: |
0106 biological sciences
Angstrom exponent food.ingredient 010504 meteorology & atmospheric sciences Planetary boundary layer Sea ice Absorption coefficient Aquatic Science Atmospheric sciences 01 natural sciences Physics::Geophysics food Scattering coefficient Physics::Atmospheric and Oceanic Physics Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences geography geography.geographical_feature_category Ecology Scattering 010604 marine biology & hydrobiology Sea salt Radiative forcing Single-scattering albedo Aerosol Southern ocean Attenuation coefficient General Earth and Planetary Sciences Environmental science Ångström exponent |
Zdroj: | Polar Science. 29:100704 |
ISSN: | 1873-9652 |
Popis: | The optical properties of aerosol particles must be clearly understood to reduce uncertainty in the prediction of the global climate change. Simultaneous measurements of scattering and absorption coefficients of aerosol particles were conducted in the atmospheric boundary layer over the western North Pacific and the Southern Ocean. For the scattering coefficient, total scattering and backscattering coefficients were measured at three different wavelengths. Over the western North Pacific, significant differences in the Angstrom exponent and absorption coefficient were found between polluted and pristine air masses. Over the parts of the Southern Ocean free of sea ice, the Angstrom exponent and the ratio of the back-to total-scattering coefficients were uniform. However, over the sea-ice regions, the scattering coefficients were an order of magnitude lower, and the Angstrom exponent an order of magnitude higher, than over the parts of the ocean free of sea ice. These differences appear to be due to the fact that the emission of aerosol precursors and sea salt particles is suppressed by sea ice. This study represents the difference in aerosol optical properties as a function of source region and sea condition. These results will contribute to improving the accuracy of estimates of the direct radiative forcing effects due to aerosol particles. |
Databáze: | OpenAIRE |
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