A5021321050- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Urban Heat Island Mitigation
- Fire effects on ecosystems
- Lightning and Electromagnetic Phenomena
- Climate variability and models
- Solar Radiation and Photovoltaics
- Geochemistry and Geologic Mapping
- Aeolian processes and effects
- Plant Water Relations and Carbon Dynamics
- Calibration and Measurement Techniques
- Remote Sensing in Agriculture
- Remote Sensing and Land Use
- Vehicle emissions and performance
- International Law and Aviation
- Catalytic Processes in Materials Science
- Advanced Combustion Engine Technologies
- Land Use and Ecosystem Services
- Space exploration and regulation
- Plant responses to elevated CO2
Earth System Science Interdisciplinary Center
2015-2024
University of Maryland, College Park
2015-2024
NOAA Oceanic and Atmospheric Research
2008-2021
Dalhousie University
1997-2000
Abstract The increasing severity of droughts/floods and worsening air quality from aerosols in Asia monsoon regions are the two gravest threats facing over 60% world population living Asian regions. These dual have fueled a large body research last decade on roles impacting weather climate. This paper provides comprehensive review studies aerosols, monsoons, their interactions. region is primary source emissions diverse species both anthropogenic natural origins. distributions aerosol...
Abstract. Fine particulate matter with aerodynamic diameters ≤2.5 µm (PM2.5) has adverse effects on human health and the atmospheric environment. The estimation of surface PM2.5 concentrations made intensive use satellite-derived aerosol products. However, it been a great challenge to obtain high-quality high-resolution data from both ground satellite observations, which is essential monitor air pollution over small-scale areas such as metropolitan regions. Here, space–time extremely...
Respirable particles with aerodynamic diameters ≤ 10 µm (PM10) have important impacts on the atmospheric environment and human health. Available PM10 datasets coarse spatial resolutions, limiting their applications, especially at city level. A tree-based ensemble learning model, which accounts for spatiotemporal information (i.e., space-time extremely randomized trees, denoted as STET model), is designed to estimate near-surface concentrations. The 1-km resolution Multi-Angle Implementation...
Abstract Aerosols have significant and complex impacts on regional climate in East Asia. Cloud‐aerosol‐precipitation interactions (CAPI) remain most challenging studies. The quantitative understanding of CAPI requires good knowledge aerosols, ranging from their formation, composition, transport, radiative, hygroscopic, microphysical properties. A comprehensive review is presented here centered the based chiefly, but not limited to, publications special section named EAST‐AIRcpc concerning...
Particulate matter with aerodynamic diameters ≤1 μm (PM1) has a greater impact on the human health but been less studied due to fewer ground observations. This study attempts improve retrieval accuracy and spatial resolution of satellite-based PM1 estimates using new ground-based monitoring network in China. Therefore, space-time extremely randomized trees (STET) model is first developed estimate concentrations at 1 km from 2014 2018 across mainland The STET can derive daily an average...
The Atmospheric Radiation Measurement Mobile Facility (AMF) was deployed in Shouxian, Anhui Province, China from 14 May to 28 December 2008. Radiosonde data obtained during the AMF campaign are used analyze cloud vertical structure over this area by taking advantage of first direct measurements layers 95 GHz radar. Single‐layer, two‐layer, and three‐layer clouds account for 28.0%, 25.8%, 13.9% all configurations, respectively. Low, middle, high deep convective 20.1%, 19.3%, 59.5%, 1.1%...
Abstract. Gaseous pollutants at the ground level seriously threaten urban air quality environment and public health. There are few estimates of gaseous that spatially temporally resolved continuous across China. This study takes advantage big data artificial-intelligence technologies to generate seamless daily maps three major ambient pollutant gases, i.e., NO2, SO2, CO, China from 2013 2020 a uniform spatial resolution 10 km. Cross-validation between our observations illustrated high on...
Abstract. Fine particulate matter with a diameter of less than 2.5 µm (PM2.5) has been used as an important atmospheric environmental parameter mainly because its impact on human health. PM2.5 is affected by both natural and anthropogenic factors that usually have strong diurnal variations. Such information helps toward understanding the causes air pollution, well our adaptation to it. Most existing products derived from polar-orbiting satellites. This study exploits use next-generation...
A systematic formulation of various radiative transfer parameterizations is presented, including the absorption approximation (AA), δ-two-stream (D2S), δ-four-stream (D4S), and δ-two- four-stream combination (D2/4S), in a consistent manner for thermal infrared flux calculations. The D2/4S scheme uses source function from evaluates intensities directions. wide range accuracy checks monochromatic emissivity homogeneous layer broadband heating rates fluxes nonhomogeneous atmospheres performed...
As a fast developing country covering large territory, China is experiencing rapid environmental changes. High concentrations of aerosols with diverse properties are emitted in the region, providing unique opportunity for understanding impact changes on climate. Until very recently, few observational studies were conducted source regions. The East Asian Study Tropospheric Aerosols: An International Regional Experiment (EAST‐AIRE) attempts to characterize physical, optical and chemical their...
Satellite remote sensing is a promising technique for estimating global or regional evapotranspiration (ET). A simple and accurate method essential when ET using data. Such investigated by taking advantage of satellite measurements the extensive ground‐based available at eight enhanced surface facility sites located throughout Southern Great Plains (SGP) area United States from January 2002 to May 2005. Data analysis shows that correlation coefficients between net radiation are highest,...
Papers published in this special section report findings from the East Asian Study of Tropospheric Aerosols: An International Regional Experiment (EAST‐AIRE). They are concerned with (1) temporal and spatial distributions aerosol loading precursor gases, (2) single scattering albedo (SSA), (3) direct radiative effects, (4) validation satellite products, (5) transport mechanisms, (6) effects air pollution on ecosystems. Aerosol is heaviest mideastern China a mean optical depth (AOD) 0.5...
Abstract Summer precipitation plays critical roles in the energy balance and availability of fresh water over eastern China. However, little is known regarding trend local‐scale (LSP). Here we developed a novel method to determine LSP events summer afternoon throughout China from 1970 2010 based on hourly gauge measurements. The occurrence hours decrease at an annual rate 0.25%, which varies considerably by region, ranging 0.14% Yangtze River Delta 0.56% Pearl Delta. This declining frequency...
One year's worth of aerosol and surface irradiance data from September 2005 to August 2006 were obtained at Taihu, the second supersite for East Asian Study Tropospheric Aerosols: An International Regional Experiment (EAST‐AIRE). Aerosol optical properties derived measurements by a Sun photometer analyzed. The used together with quantitatively estimate effects on shortwave radiation (SWR) photosynthetically active (PAR). annual mean depth 500 nm is 0.77, Ångstrom wavelength exponent 1.17....
Abstract. The effect of aerosols on lightning has been noted in many case studies, but much less is known about the long-term impact, relative importance dynamics–thermodynamics versus aerosol, and any difference by different types aerosols. Attempts are made to tackle all these factors, whose distinct roles discovered analyzing 11-year datasets lightning, aerosol loading composition, dynamic–thermodynamic data from satellite model reanalysis. Variations rate analyzed with respect changes...
Abstract. The aerosol liquid water (ALW) content (ALWC), an important component of atmospheric particles, has a significant effect on optical properties, visibility and multiphase chemical reactions. In this study, ALWC is determined from hygroscopic growth factor (GF) particle number size distribution (PNSD) measurements also simulated by ISORROPIA II, thermodynamic equilibrium model, with measured composition data taken at urban site in Beijing 8 November to 15 December 2017. Rich made...
Abstract The local‐scale precipitation (LSP) is mainly driven by thermal convection. Here we reveal a decreasing trend in the summertime LSP frequency over both China and United States utilizing hourly rain gauge data from 1981 to 2012. contrasting aerosol likely contributes this same declining of countries. As optical depth (AOD) goes beyond turning zone 0.25–0.30, impact on changes invigoration suppression. mean AOD generally less larger than range opposite trends States, respectively,...
Abstract. The urban heat island intensity (UHII) is the temperature difference between areas and their rural surroundings. It commonly attributed to changes in underlying surface structure caused by urbanization. Air pollution aerosol particles can affect UHII through changing (1) energy balance radiative effect (ARE) (2) planetary-boundary-layer (PBL) stability airflow modifying thermodynamic structure, which referred as dynamic (ADE). By analyzing satellite data ground-based observations...
Four years of columnar aerosol optical properties and a one‐year vertical profiles particle extinction coefficient at 527 nm are analyzed Taihu in the central Yangtze River Delta region eastern China. Seasonal variations properties, distribution, influence on shortwave radiation heating rates were investigated. Multiyear depths (AOD), Ångstrom exponents, single scattering albedo (SSA) asymmetry factor (ASY) analyzed, together with profile extinction. AOD is largest summer smallest winter....
Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol products have been used to address climatic issues in many parts of the world, but their quality has yet be determined over China. This paper presents a thorough evaluation optical depth (AOD) data retrieved from MODIS collections 4 (C004) and 5 (C005) at two AERONET sites northern southeastern Established under aegis East Asian Study Tropospheric Aerosols: An International Regional Experiment (EAST‐AIRE) project, sites, Xianghe...