00624nas a2200169 4500008004100000245009000041210006900131260000900200300001400209490000800223653002300231100001700254700001800271700001900289700001500308856013100323 2020 eng d00aModeling and Regionalization of China's PM2.5 Using Spatial-Functional Mixture Models0 aModeling and Regionalization of Chinas PM25 Using SpatialFunctio c2020 a116–1320 v11610aBusiness Analytics1 aLiang, Decai1 aZhang, Haozhe1 aChang, Xiaohui1 aHuang, Hui uhttps://stage.business.oregonstate.edu/biblio/modeling-and-regionalization-chinas-pm25-using-spatial-functional-mixture-models02119nas a2200157 4500008004000000245006700040210006700107260001800174520157000192653002301762100001901785700001601804700001501820700001701835856010901852 0 engd00aAdditive Dynamic Models for Correcting Numerical Model Outputs0 aAdditive Dynamic Models for Correcting Numerical Model Outputs c2023 In Press3 a
Numerical air quality models are pivotal for the prediction and assessment of air pollution, but numerical model outputs may be systematically biased. An additive dynamic model is proposed to correct large-scale raw model outputs using data from other sources, including readings collected at ground monitoring networks and weather outputs from other numerical models. An additive partially linear model specification is employed for the nonlinear relationships between air pollutants and covariates. In addition, a multi-resolution basis function approximate is proposed to capture the different small-scale variations of biases, and a discretized stochastic
integro-differential equation is constructed to characterize the dynamic evolution of the random coefficients at each spatial resolution. An expectation-maximization algorithm is developed for parameter estimation and a multi-resolution ensemble-based scheme is embedded to accelerate the computation. For statistical inference, a conditional simulation technique is applied to quantify the uncertainty of parameter estimates and bias correction results. The proposed approach is used to correct the biased raw outputs of PM2.5 from the Community Multiscale Air
Quality (CMAQ) system for China’s Beijing-Tianjin-Hebei region. Our method improves the root mean squared error and continuous rank probability score by 43.70% and 34.76%, respectively. Compared to other statistical methods under different metrics, our model has advantages in both correction accuracy and computational efficiency.10aBusiness Analytics1 aChang, Xiaohui1 aChen, Yewen1 aHuang, Hui1 aLuo, Fangzhi uhttps://stage.business.oregonstate.edu/biblio/additive-dynamic-models-correcting-numerical-model-outputs