Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Aerosol vertical distribution over east China from RIEMS-Chem simulation in comparison with CALIPSO measurements
Abstract The horizontal and vertical distributions of aerosol extinction coefficient (AEC) and mass concentration over east China in October 2010 were investigated by using an online-coupled regional climate model and CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) data. Model performance was evaluated comprehensively against ground observations of meteorological variables and PM10 concentrations and CALIPSO retrieved AEC profiles, which demonstrated a good ability of the model in simulating spatial distribution and evolution of aerosol concentration and optical properties. Severe pollution episodes were found over wide areas of east China during the study period, with the maximum mean PM10 concentration exceeding 200 μg m−3 in the Chongqing district and a part of the lower reaches of the Yellow River on 8–10 October. Both CALIPSO retrievals and model simulations revealed high AEC values (≥1 km−1) often occurred within 2 km above ground over most areas of east China. AEC vertical profile in or in the vicinity of China major cities along CALIPSO orbit track exhibited two typical features: one was AEC reached its maximum (∼4 km−1) near the surface (<200 m) and decreased rapidly to < 0.1 km−1 at altitudes above 1 km, another one was AEC peaked at higher altitudes of about 0.5–1 km with a maximum up to 3 km−1. AEC vertical profile was strongly dependent on vertical distribution of both aerosol concentration, composition and relative humidity. The vertical cross sections over typical regions of east China exhibited a decreasing AEC in magnitude from the continent to the China seas. Over the continent, AEC was either maximum near the surface or peaked at higher altitudes (0.5–1.0 km) due to increases of relative humidity or aerosol concentration in those regions, whereas over the seas of China, AEC profile was characterized by peak values at an altitude around 1 km, mainly due to an elevated relative humidity there, which favored rapid aerosol hygroscopic growth and consequently AEC increase.
Highlights An on-line coupled model RIEMS-Chem was used to study aerosol distribution over east China. Vertical profiles of aerosol extinction coefficient (AEC) from CALIPSO and model were analyzed. AEC often peaked at 0.5–1.0 km altitudes in or in the vicinity of megacities of east China. AEC profile was characterized by peaks at 1 km altitude over the East China Sea and Yellow Sea. Both aerosol concentration, composition and relative humidity determined AEC vertical profile.
Aerosol vertical distribution over east China from RIEMS-Chem simulation in comparison with CALIPSO measurements
Abstract The horizontal and vertical distributions of aerosol extinction coefficient (AEC) and mass concentration over east China in October 2010 were investigated by using an online-coupled regional climate model and CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) data. Model performance was evaluated comprehensively against ground observations of meteorological variables and PM10 concentrations and CALIPSO retrieved AEC profiles, which demonstrated a good ability of the model in simulating spatial distribution and evolution of aerosol concentration and optical properties. Severe pollution episodes were found over wide areas of east China during the study period, with the maximum mean PM10 concentration exceeding 200 μg m−3 in the Chongqing district and a part of the lower reaches of the Yellow River on 8–10 October. Both CALIPSO retrievals and model simulations revealed high AEC values (≥1 km−1) often occurred within 2 km above ground over most areas of east China. AEC vertical profile in or in the vicinity of China major cities along CALIPSO orbit track exhibited two typical features: one was AEC reached its maximum (∼4 km−1) near the surface (<200 m) and decreased rapidly to < 0.1 km−1 at altitudes above 1 km, another one was AEC peaked at higher altitudes of about 0.5–1 km with a maximum up to 3 km−1. AEC vertical profile was strongly dependent on vertical distribution of both aerosol concentration, composition and relative humidity. The vertical cross sections over typical regions of east China exhibited a decreasing AEC in magnitude from the continent to the China seas. Over the continent, AEC was either maximum near the surface or peaked at higher altitudes (0.5–1.0 km) due to increases of relative humidity or aerosol concentration in those regions, whereas over the seas of China, AEC profile was characterized by peak values at an altitude around 1 km, mainly due to an elevated relative humidity there, which favored rapid aerosol hygroscopic growth and consequently AEC increase.
Highlights An on-line coupled model RIEMS-Chem was used to study aerosol distribution over east China. Vertical profiles of aerosol extinction coefficient (AEC) from CALIPSO and model were analyzed. AEC often peaked at 0.5–1.0 km altitudes in or in the vicinity of megacities of east China. AEC profile was characterized by peaks at 1 km altitude over the East China Sea and Yellow Sea. Both aerosol concentration, composition and relative humidity determined AEC vertical profile.
Aerosol vertical distribution over east China from RIEMS-Chem simulation in comparison with CALIPSO measurements
Li, Jiawei (Autor:in) / Han, Zhiwei (Autor:in)
Atmospheric Environment ; 143 ; 177-189
15.08.2016
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Runoff Simulation in the Upper Reaches of Heihe River Basin Based on the RIEMS–SWAT Model
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