A5078108017- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Organometallic Complex Synthesis and Catalysis
- Climate variability and models
- Air Quality and Health Impacts
- Synthesis and characterization of novel inorganic/organometallic compounds
- Organoboron and organosilicon chemistry
- Metal complexes synthesis and properties
- Meteorological Phenomena and Simulations
- Organophosphorus compounds synthesis
- CO2 Reduction Techniques and Catalysts
- Inorganic and Organometallic Chemistry
- Catalytic Processes in Materials Science
- Coordination Chemistry and Organometallics
- Synthesis and Characterization of Heterocyclic Compounds
- Lanthanide and Transition Metal Complexes
- Luminescence Properties of Advanced Materials
- Catalytic Cross-Coupling Reactions
- Magnetism in coordination complexes
- Crystal structures of chemical compounds
- Cryospheric studies and observations
- Crystallography and molecular interactions
Texas A&M University
2020-2024
Massachusetts Institute of Technology
2023
Mitchell Institute
2022-2023
Chinese Academy of Sciences
2023
Institute of Atmospheric Physics
2023
University of Wyoming
2016-2021
Georgia Institute of Technology
2010-2018
Wyoming Department of Education
2015-2017
Capital Normal University
2015-2016
The University of Texas at Austin
2004-2010
Uncertainty in the representation of biomass burning (BB) aerosol composition and optical properties climate models contributes to a range modeled effects on incoming solar radiation. Depending model, top-of-the-atmosphere BB effect can from cooling warming. By relating absorption relative extinction carbonaceous 12 observational datasets nine state-of-the-art Earth system models/chemical transport models, we identify varying degrees overestimation absorptivity by these models. Modifications...
Marine stratocumulus clouds cover nearly one-quarter of the ocean surface and thus play an extremely important role in determining global radiative balance. The semipermanent marine deck over southeastern Atlantic Ocean is particular interest, because its interactions with seasonal biomass burning aerosols that are emitted southern Africa. Understanding impacts on implications for regional balance still very limited. Previous studies have focused assessing magnitude warming caused by solar...
Abstract. Aerosol indirect radiative forcing (IRF), which characterizes how aerosols alter cloud formation and properties, is very sensitive to the preindustrial (PI) aerosol burden. Dimethyl sulfide (DMS), emitted from ocean, a dominant natural precursor of non-sea-salt sulfate in PI pristine present-day (PD) atmospheres. Here we revisit atmospheric oxidation chemistry DMS, particularly under conditions, its impact on IRF. Based previous laboratory studies, expand simplified DMS scheme used...
Abstract. A recent development in the representation of aerosols climate models is realization that some components organic aerosol (OA), emitted from biomass and biofuel burning, can have a significant contribution to shortwave radiation absorption atmosphere. The absorbing fraction OA referred as brown carbon (BrC). This study introduces one first implementations BrC into Community Atmosphere Model version 5 (CAM5), using parameterization for absorptivity described Saleh et al. (2014)....
A novel Y 2 CaHfScAl 3 O 12 :Cr 3+ ,Yb NIR phosphor and application demonstration in the fields of information encryption non-invasive detection.
Abstract. Aerosols from open-land fires could significantly perturb the global radiation balance and induce climate change. In this study, Community Atmosphere Model version 5 (CAM5) with prescribed daily fire aerosol emissions is used to investigate spatial seasonal characteristics of radiative effects (REs, relative case no fires) open-fire aerosols including black carbon (BC) particulate organic matter (POM) 2003 2011. The annual mean RE aerosol–radiation interactions (REari) all 0.16 ±...
Abstract The reliability of climate simulations and projections, particularly in the regions with complex terrains, is greatly limited by model resolution. In this study we evaluate variable‐resolution Community Earth System Model (VR‐CESM) a high‐resolution (0.125°) refinement over Rocky Mountain region. VR‐CESM results are compared observations, as well CESM simulation at quasi‐uniform 1° resolution (UNIF) Canadian Regional Climate version 5 (CRCM5) 0.11° We find that effective capturing...
Abstract Aerosols emitted from wildfires could significantly affect global climate through perturbing radiation balance. In this study, the Community Earth System Model with prescribed daily fire aerosol emissions is used to investigate aerosols’ impacts on emphasis role of feedbacks. The total radiative effect (RE) estimated be −0.78 ± 0.29 W m −2 , which mostly shortwave RE due aerosol–cloud interactions (REaci; −0.70 0.20 ). associated annual-mean surface air temperature (SAT) change ∆ T...
An advanced aerosol treatment, with a focus on semivolatile nitrate formation, is introduced into the Community Atmosphere Model version 5 interactive chemistry (CAM5-chem) by coupling for Simulating Aerosol Interactions and Chemistry (MOSAIC) 7-mode Modal Module (MAM7). important feature of MOSAIC dynamic partitioning all condensable gases to different fine coarse mode aerosols, as governed mode-resolved thermodynamics heterogeneous chemical reactions. Applied in free-running from 1995 2005...
Abstract India as a hotspot for air pollution has heavy black carbon (BC) and dust (DU) loadings. BC been identified to significantly impact the Indian climate. However, whether BC-climate interactions regulate DU during premonsoon season is unclear. Here, using long-term Reanalysis data, we show that positively correlated northern while negatively southern BC. We further identify mechanism of BC-dust-climate revealed COVID-19. reduction in due lockdown decreases solar heating atmosphere...
Abstract Dust aerosol plays an important role in the Earth System. As a natural aerosol, dust is often calculated interactively global climate models and temporal variations of emission past century are far less constrained compared to those anthropogenic emissions. Here we evaluate East Asia simulated by 15 participating Coupled Model Intercomparison Project Phase 5. The results show that none can reproduce observed decline event frequency during 1961–2005 over Asia. tend simulate either...
Abstract Dry deposition is an important process affecting the lifetime and spatial distributions of atmospheric aerosols. Black carbon (BC) plays role in Earth's climate, but subject to large bias remote regions model simulations. In this study, improve BC simulations, scheme Petroff Zhang ( ) (PZ10) implemented into Community Atmospheric Model version 5 (CAM5), simulations using PZ10 are compared with one default et al. (Z01) observations. The predicts much lower dry velocity (V d than Z01...
Abstract. Secondary organic aerosol (SOA) is a dominant contributor of fine particulate matter in the atmosphere, but complexity SOA formation chemistry hinders accurate representation models. Volatility-based parameterizations have been adopted many recent modeling studies and shown reasonable performance compared to observations. However, assumptions made these empirical can lead substantial errors when applied future climatic conditions as they do not include mechanistic understanding...
Abstract We incorporate the Model for Simulating Aerosol Interactions and Chemistry (MOSAIC) module in Community Earth System version 2 (CESM2) Atmosphere Version 6 with interactive chemistry (CAM6‐chem), couple it four mode of Modal Module (MAM4). The MOSAIC is used to simulate thermodynamics gas‐aerosol mass exchange, a special focus on simulating nitrate aerosol. By comparing against ground satellite observations, we found that MOSAIC/MAM4 scheme performs reasonably well spatiotemporal...
Abstract. The deposition of light-absorbing aerosols (LAAs), such as black carbon (BC) and dust, onto snow cover has been suggested to reduce the albedo modulate snowpack consequent hydrologic cycle. In this study we use variable-resolution Community Earth System Model (VR-CESM) with a regionally refined high-resolution (0.125°) grid quantify impacts LAAs in Rocky Mountain region during period 1981–2005. We first evaluate model simulation LAA concentrations both near surface then investigate...
Abstract The maximum supersaturation ( S x ) in clouds is a key parameter affecting the cloud's microphysical and radiative properties. We investigate of marine boundary layer by combining airborne surface observations Eastern North Atlantic. cloud droplet number concentration N c least diluted cores agrees well with particles larger than Hoppel Minimum (HM) >HM below clouds, indicating that HM represents average size threshold above which are activated to form droplets. values derived...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeometrically Distorted and Redox-Active Organometallic Iridium Complexes Containing Biphenyl-2,2'-diylZheng Lu, Chul-Ho Jun, Susan R. de Gala, Michael P. Sigalas, Odile Eisenstein, Robert H. CrabtreeCite this: Organometallics 1995, 14, 3, 1168–1175Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeprotonated thioamides as thiolate S-donor ligands with a high tendency to avoid M-S-M bridge formation: crystal and molecular structure of bis(2-hydroxy-5-methylacetophenone N,N-dimethylthiosemicarbazonato)dinickelZheng Lu, Corbet White, Arnold L. Rheingold, Robert H. CrabtreeCite this: Inorg. Chem. 1993, 32, 19, 3991–3994Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September...
Abstract Previous studies have noticed that the Coupled Model Intercomparison Project Phase 6 (CMIP6) models with a stronger cooling from aerosol‐cloud interactions (ACI) also an enhanced warming positive cloud feedback, and these two opposing effects are counter‐balanced in simulations of historical period. However, reasons for this anti‐correlation less explored. In study, we perturb ice microphysical processes to obtain liquid varying amounts Earth System Models (ESMs). We find model...
Abstract We introduce a physics‐based aerosol wet removal scheme with unified treatments of transport and by convective clouds into the Community Atmosphere Model version 6. Since several important physical processes are still neglected or poorly represented in this new scheme, we develop secondary improvements to parameterizations activation, resuspension, cloud‐borne detrainment scheme. Changes cause tropospheric concentrations decrease different extents: compared control run,...
The catalyst [Ir(biph)(PMe3)3Cl] (biph = biphenyl-2,2′-diyl) gives head-to-head dimerization of 1-alkynes to the corresponding Z-enynes.
Abstract We investigate the influence of wildfire smoke aerosols on cloud microphysics and precipitation using a coupled aerosol‐cloud microphysics‐meteorology model WRF‐Chem‐SMOKE. The Wildfire Automated Biomass Burning Algorithm products are used to compute “online” hourly size‐ composition‐resolved emission fluxes during Canadian boreal wildfires in summer 2007. Comparisons with Moderate Resolution Imaging Spectroradiometer aerosol optical depth, Ozone Monitoring Instrument index,...