L
Lu Shen
Researcher at Harvard University
Publications - 61
Citations - 3496
Lu Shen is an academic researcher from Harvard University. The author has contributed to research in topics: Methane & Climate change. The author has an hindex of 17, co-authored 49 publications receiving 1608 citations. Previous affiliations of Lu Shen include Environmental Defense Fund.
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Journal ArticleDOI
Anthropogenic drivers of 2013–2017 trends in summer surface ozone in China
TL;DR: In this article, the effect of meteorological variability on ozone trends was investigated using a multiple linear regression model and the residual of this regression showed increasing ozone trends of 1-3 ppbv a−1 in megacity clusters of eastern China that they attributed to changes in anthropogenic emissions.
Journal ArticleDOI
A two-pollutant strategy for improving ozone and particulate air quality in China
Ke Li,Ke Li,Daniel J. Jacob,Hong Liao,Jia Zhu,Viral Shah,Lu Shen,Kelvin H. Bates,Qiang Zhang,Shixian Zhai +9 more
TL;DR: In this paper, the authors show observational evidence for this effect with 2013-2018 summer data of hourly ozone and PM2.5 concentrations from 106 sites in the North China Plain.
Journal ArticleDOI
Fine particulate matter (PM 2.5 ) trends in China, 2013–2018: separating contributions from anthropogenic emissions and meteorology
Shixian Zhai,Daniel J. Jacob,Xuan Wang,Lu Shen,Ke Li,Yuzhong Zhang,Ke Gui,Tianliang Zhao,Hong Liao +8 more
Abstract: Abstract. Fine particulate matter (PM2.5) is a severe air pollution
problem in China. Observations of PM2.5 have been available since 2013
from a large network operated by the China National Environmental Monitoring
Center (CNEMC). The data show a general 30 %–50 % decrease in annual mean
PM2.5 across China over the 2013–2018 period, averaging at −5.2 µg m−3 a−1. Trends in the five megacity cluster regions targeted by
the government for air quality control are -9.3±1.8 µg m−3 a−1 (±95 % confidence interval) for Beijing–Tianjin–Hebei,
-6.1±1.1 µg m−3 a−1 for the Yangtze River Delta, -2.7±0.8 µg m−3 a−1 for the Pearl River Delta, -6.7±1.3 µg m−3 a−1 for the Sichuan Basin, and -6.5±2.5 µg m−3 a−1 for the Fenwei Plain (Xi'an). Concurrent 2013–2018
observations of sulfur dioxide (SO2) and carbon monoxide (CO) show that
the declines in PM2.5 are qualitatively consistent with drastic
controls of emissions from coal combustion. However, there is also a large
meteorologically driven interannual variability in PM2.5 that
complicates trend attribution. We used a stepwise multiple linear regression
(MLR) model to quantify this meteorological contribution to the PM2.5 trends across China. The MLR model correlates the 10 d PM2.5
anomalies to wind speed, precipitation, relative humidity, temperature, and
850 hPa meridional wind velocity (V850). The meteorology-corrected
PM2.5 trends after removal of the MLR meteorological contribution can
be viewed as being driven by trends in anthropogenic emissions. The mean
PM2.5 decrease across China is −4.6 µg m−3 a−1 in the
meteorology-corrected data, 12 % weaker than in the original data, meaning
that 12 % of the PM2.5 decrease in the original data is
attributable to meteorology. The trends in the meteorology-corrected data
for the five megacity clusters are -8.0±1.1 µg m−3 a−1 for Beijing–Tianjin–Hebei (14 % weaker than in the original
data), -6.3±0.9 µg m−3 a−1 for the Yangtze River Delta
(3 % stronger), -2.2±0.5 µg m−3 a−1 for the Pearl River
Delta (19 % weaker), -4.9±0.9 µg m−3 a−1 for
the Sichuan Basin (27 % weaker), and -5.0±1.9 µg m−3 a−1 for the Fenwei Plain (Xi'an; 23 % weaker); 2015–2017 observations of
flattening PM2.5 in the Pearl River Delta and increases in the Fenwei
Plain can be attributed to meteorology rather than to relaxation of emission
controls.
Journal ArticleDOI
Increases in surface ozone pollution in China from 2013 to 2019: anthropogenic and meteorological influences
TL;DR: In this paper, the authors used a multiple linear regression model to fit ozone to meteorological variables and found that meteorology played a significant but not dominant role in the 2013-2019 ozone trend.
Journal ArticleDOI
Meteorology and Climate Influences on Tropospheric Ozone: a Review of Natural Sources, Chemistry, and Transport Patterns
TL;DR: In this paper, the authors summarized three dominant pathways of meteorological and climatic impacts on tropospheric ozone and present their recent progress, including changes in the natural precursor emissions, the kinetics and partitioning of chemistry and deposition, and the transport of ozone and its precursors.