Premium
Improved meteorology and ozone air quality simulations using MODIS land surface parameters in the Yangtze River Delta urban cluster, China
Author(s) -
Li Mengmeng,
Wang Tijian,
Xie Min,
Zhuang Bingliang,
Li Shu,
Han Yong,
Song Yu,
Cheng Nianliang
Publication year - 2017
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/2016jd026182
Subject(s) - environmental science , air quality index , moderate resolution imaging spectroradiometer , urban heat island , atmospheric sciences , land cover , atmosphere (unit) , planetary boundary layer , mesoscale meteorology , meteorology , diurnal cycle , climatology , satellite , land use , geography , geology , engineering , aerospace engineering , turbulence , civil engineering
Land surface parameters play an important role in the land‐atmosphere coupling and thus are critical to the weather and dispersion of pollutants in the atmosphere. This work aims at improving the meteorology and air quality simulations for a high‐ozone (O 3 ) event in the Yangtze River Delta urban cluster of China, through incorporation of satellite‐derived land surface parameters. Using Moderate Resolution Imaging Spectroradiometer (MODIS) input to specify the land cover type, green vegetation fraction, leaf area index, albedo, emissivity, and deep soil temperature provides a more realistic representation of surface characteristics. Preliminary evaluations reveal clearly improved meteorological simulation with MODIS input compared with that using default parameters, particularly for temperature (from −2.5 to −1.7°C for mean bias) and humidity (from 9.7% to 4.3% for mean bias). The improved meteorology propagates through the air quality system, which results in better estimates for surface NO 2 (from 11.5 to 8.0 ppb for mean bias) and nocturnal O 3 low‐end concentration values (from −18.8 to −13.6 ppb for mean bias). Modifications of the urban land surface parameters are the main reason for model improvement. The deeper urban boundary layer and intense updraft induced by the urban heat island are favorable for pollutant dilution, thus contributing to lower NO 2 and elevated nocturnal O 3 . Furthermore, the intensified sea‐land breeze circulation may exacerbate O 3 pollution at coastal cities through pollutant recirculation. Improvement of mesoscale meteorology and air quality simulations with satellite‐derived land surface parameters will be useful for air pollution monitoring and forecasting in urban areas.