A5057365386- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Vehicle emissions and performance
- Gut microbiota and health
- COVID-19 impact on air quality
- Meteorological Phenomena and Simulations
- Mercury impact and mitigation studies
- Climate variability and models
- Spectroscopy and Laser Applications
- Climate Change and Health Impacts
- Inflammatory Bowel Disease
- Probiotics and Fermented Foods
- Radiomics and Machine Learning in Medical Imaging
- Maritime Transport Emissions and Efficiency
- Microplastics and Plastic Pollution
- Climate Change Policy and Economics
- Gas Sensing Nanomaterials and Sensors
- Plant responses to elevated CO2
- Wind and Air Flow Studies
- Environmental Impact and Sustainability
- Radiation Dose and Imaging
Southern University of Science and Technology
2019-2025
National Supercomputing Center in Shenzhen
2023-2025
Early Warning (United States)
2025
Royal Belgian Institute for Space Aeronomy
2024
Tufts Medical Center
2022-2024
Peking University
2011-2023
Chinese Academy of Medical Sciences & Peking Union Medical College
2023
Shenzhen University
2023
NOAA Oceanic and Atmospheric Research
2019
Tsinghua University
2013
We construct global budgets of atmospheric glyoxal and methylglyoxal with the goal quantifying their potential for secondary organic aerosol (SOA) formation via irreversible uptake by aqueous aerosols clouds. conduct a detailed simulation in GEOS‐Chem 3‐D chemical transport model including our best knowledge source sink processes. Our resulting estimates sources are 45 Tg −1 140 , respectively. Oxidation biogenic isoprene contributes globally 47% 79% methylglyoxal. The second most important...
We use a continuous 6‐year record (1996–2001) of GOME satellite measurements formaldehyde (HCHO) columns over east and south Asia to improve regional emission estimates reactive nonmethane volatile organic compounds (NMVOCs), including isoprene, alkenes, HCHO, xylenes. Mean monthly HCHO observations are compared simulated from the GEOS‐Chem chemical transport model using state‐of‐science, “bottom‐up” inventories Streets et al. (2003a) for anthropogenic biomass burning emissions Guenther...
Abstract. Formation of SOA from the aromatic species toluene, xylene, and, for first time, benzene, is added to a global chemical transport model. A simple mechanism presented that accounts competition between low and high-yield pathways formation, wherein secondary gas-phase products react further with either nitric oxide (NO) or hydroperoxy radical (HO2) yield semi- non-volatile products, respectively. Aromatic more when they OH in regions where [NO]/[HO2] ratios are lower. The thus...
Abstract. Severe surface ozone pollution over major Chinese cities has become an emerging air quality concern, raising a new challenge for emission control measures in China. In this study, we explore the source contributions to daily maximum 8 h average (MDA8) China 2016 and 2017, 2 years with highest averaged record. We estimate of anthropogenic, background, individual natural sources using GEOS-Chem chemical transport model at 0.25∘×0.3125∘ horizontal resolution most up-to-date...
Quantifying isoprene emissions using satellite observations of the formaldehyde (HCHO) columns is subject to errors involving column retrieval and assumed relationship between HCHO emissions, taken here from GEOS‐CHEM chemical transport model. Here we use a 6‐year (1996–2001) data set Global Ozone Monitoring Experiment (GOME) instrument (1) quantify these errors, (2) evaluate GOME‐derived with in situ flux measurements process‐based emission inventory (Model Emissions Gases Aerosols Nature,...
Space‐borne formaldehyde (HCHO) column measurements from the Ozone Monitoring Instrument (OMI), with 13 × 24 km 2 nadir footprint and daily global coverage, provide new constraints on spatial distribution of biogenic isoprene emission North America. OMI HCHO columns for June‐August 2006 are consistent earlier GOME satellite sensor (1996–2001) but is 2–14% lower. The follows that emission; anthropogenic hydrocarbon emissions undetectable except in Houston. We develop updated relationships...
Abstract. The global organic aerosol (OA) budget is highly uncertain and past studies suggest that models substantially underestimate observed concentrations. Few of these have examined the vertical distribution OA. Furthermore, many model-measurement comparisons been performed with different for single field campaigns. We synthesize measurements from 17 aircraft campaigns 2001–2009 use observations to consistently evaluate a GEOS-Chem model simulation. Remote, polluted fire-influenced...
Since its first confirmed case at the end of 2019, COVID-19 has become a global pandemic in three months with more than 1.4 million cases worldwide, as early April 2020. Quantifying changes pollutant emissions due to and associated governmental control measures is crucial understand impacts on economy, air pollution, society. We used WRF-GC model tropospheric NO2 column observations retrieved by TROPOMI instrument derive top-down NOx emission change estimation between periods: P1 (January...
Abstract This study compares recent CO, NO x , NMVOC, SO 2 BC, and OC anthropogenic emissions from several state‐of‐the‐art top‐down estimates to global regional bottom‐up inventories projections five Shared Socioeconomic Pathways (SSPs) in regions. Results show that derived studies exhibit similar uncertainty as some regions for certain species even less the case of Chinese CO emissions. In general, largest discrepancies are found outside such United States, Europe, Japan where most...
The evaporative emissions of anthropogenic volatile organic compounds (AVOCs) are sensitive to ambient temperature. This sensitivity forms an air pollution-meteorology connection that has not been assessed on a regional scale. We parametrized the temperature dependence AVOC fluxes in quality model and evaluated impacts surface ozone Beijing–Tianjin–Hebei (BTH) area China during summer 2017. dependency drove enhanced simulated ozone-temperature 1.0 1.8 μg m–3 K–1, comparable driven by...
We analyze 16‐month data of 13 major halocarbons measured at a southern China coastal site in the greater Pearl River Delta (PRD). A total 188 canister air samples were collected from August 2001 to December 2002. Overall inspection indicated that CH 2 Cl , C 4 and HCl 3 had similar temporal variations while CFC‐11, CFC‐12, CFC‐113 showed same emission patterns during sampling period. Diurnal presented different ozone episode days, mainly related strength, atmospheric dispersion,...
We present the first directly retrieved global distribution of tropospheric column ozone from Global Ozone Monitoring Experiment (GOME) ultraviolet measurements during December 1996 to November 1997. The retrievals clearly show signals due convection, biomass burning, stratospheric influence, pollution, and transport. They are capable capturing spatiotemporal evolution in response regional or short time‐scale events such as 1997–1998 El Niño event a 10–20 DU change within few days. displays...
Abstract. We have incorporated a semi-mechanistic isoprene emission module into the JULES land-surface scheme, as first step towards modelling tool that can be applied for studies of vegetation – atmospheric chemistry interactions, including chemistry-climate feedbacks. Here, we evaluate coupled model against local above-canopy flux measurements from six tower sites well satellite-derived estimates over tropical South America and east south Asia. The simulates diurnal variability well:...
We quantify the source contributions to surface PM2.5 (fine particulate matter) pollution over North China from January 2013 2015 using GEOS-Chem chemical transport model and its adjoint with improved horizontal resolution (1/4° × 5/16°) aqueous-phase chemistry for sulfate production. The method attributes emissions different sectors species at resolution. Wintertime Beijing is contributed by of organic carbon (27% total contribution), anthropogenic fine dust (27%), SO2 (14%), which are...
Abstract. We simulated elemental carbon (EC) and organic (OC) aerosols in China compared model results to surface measurements at Chinese rural background sites, with the goal of deriving "top-down" emission estimates EC OC, as well better quantifying secondary sources OC. included state-of-the-science "bottom-up" inventories for (1.92 TgC yr−1) OC (3.95 yr−1), updated formation pathways. The average annual mean concentration sites was 1.1 μgC m−3, 56% lower than observed 2.5 m−3. 3.4 76% 14...
Abstract. We calculated the organic matter to carbon mass ratios (OM/OC ratios) in PM2.5 collected from 14 Chinese cities during summer and winter of 2003 analyzed causes for their seasonal spatial variability. The OM/OC were two ways. Using a balance method, averaged 1.92 ± 0.39 year-round, with no significant or variation. second calculation was based on chemical species analyses compounds extracted samples using dichloromethane/methanol water. ratio relatively high (1.75 0.13)...
Abstract We use 2005–2016 observations of formaldehyde (HCHO) columns over China from the OMI, GOME‐2, and SCIAMACHY satellite instruments to evaluate long‐term trends in emission inventories volatile organic compounds (VOCs) that affect air quality. The show large increases North Plain (+1.1 ± 0.5% a −1 relative 2005) Yangtze River Delta region (+1.5 0.4% 2005), consistent with trend anthropogenic VOC emissions Multi‐resolution Emission Inventory for (MEIC). Unlike other pollutants, have...
Climate warming may bear a penalty on future ozone air quality, even in the absence of changes anthropogenic activities. This has important implications for policy-making, but its quantification involves complex meteorological, chemical, and biological processes feedbacks that are not well understood. We examined how climate-sensitive affect surface ozone, identified key knowledge gaps uncovered by recent studies, summarized latest assessments climate change quality. Recent analyses have...
Abstract Global reanalysis products are important tools across disciplines to study past meteorological changes and especially useful for wind energy resource evaluations. Studies of observed speed show that land surface declined globally since the 1960s (known as global terrestrial stilling) but reversed with a turning point around 2010. Whether declining trend have been captured by remains unknown so far. To fill this research gap, systematic assessment climatological winds trends in five...
We developed a regional atmospheric transport model for microplastics (MPs, 10 μm to 5 mm in size) over Asia and the adjacent Pacific Indian oceans, accounting MPs' size- shape-dependent aerodynamics. The was driven by tuned emissions of MPs from land ocean, simulations were evaluated against coastal (n = 19) marine 56) observations. Our oceans 310 Gg y–1 (1 1 kton) 60 y–1, respectively. MP lines fragments may be transported atmosphere >1000 km; pellets our mostly deposited near-source....
Levoglucosan has been widely used to quantitatively assess biomass burning's contribution ambient aerosols, but previous such assessments have not accounted for levoglucosan's degradation in the atmosphere. We develop first global simulation of atmospheric levoglucosan, explicitly accounting its chemical degradation, evaluate impacts on use quantitative aerosol source apportionment. is emitted into atmosphere from burning plant matter open fires (1.7 Tg yr–1) and as biofuels (2.1 yr–1)....