Now showing items 1-20 of 29

• #### Annual Distributions and Sources of Arctic Aerosol Components, Aerosol Optical Depth, and Aerosol Absorption ﻿

(Wiley-Blackwell, 2014)
Radiative forcing by aerosols and tropospheric ozone could play a significant role in recent Arctic warming. These species are in general poorly accounted for in climate models. We use the GEOS-Chem global chemical transport ...
• #### Anthropogenic emissions of highly reactive volatile organic compounds in eastern Texas inferred from oversampling of satellite (OMI) measurements of HCHO columns ﻿

(IOP Publishing, 2014)
Satellite observations of formaldehyde (HCHO) columns provide top-down constraints on emissions of highly reactive volatile organic compounds (HRVOCs). This approach has been used previously in the US to estimate isoprene ...
• #### Climate response to the increase in tropospheric ozone since preindustrial times: A comparison between ozone and equivalent CO 2 forcings ﻿

(Wiley-Blackwell, 2004)
We examine the characteristics of the climate response to anthropogenic changes in tropospheric ozone. Using a general circulation model, we have carried out a pair of equilibrium climate simulations with realistic present-day ...
• #### Climatic Effects of 1950-2050 Changes in US Anthropogenic Aerosols - Part 1: Aerosol Trends and Radiative Forcing ﻿

(European Geosciences Union, 2012)
We calculate decadal aerosol direct and indirect (warm cloud) radiative forcings from US anthropogenic sources over the 1950–2050 period. Past and future aerosol distributions are constructed using GEOS-Chem and historical ...
• #### Climatic Effects of 1950-2050 Changes in US Anthropogenic Aerosols - Part 2: Climate Response ﻿

(European Geosciences Union, 2012)
We investigate the climate response to changing US anthropogenic aerosol sources over the 1950–2050 period by using the NASA GISS general circulation model (GCM) and comparing to observed US temperature trends. Time-dependent ...
• #### Correlations between Fine Particulate Matter $(PM_{2.5})$ and Meteorological Variables in the United States: Implications for the Sensitivity of $PM_{2.5}$ to Climate Change ﻿

(Elsevier, 2010)
We applied a multiple linear regression (MLR) model to study the correlations of total $PM_{2.5}$ and its components with meteorological variables using an 11-year (1998–2008) observational record over the contiguous US. ...
• #### Eastern Asian emissions of anthropogenic halocarbons deduced from aircraft concentration data ﻿

(Wiley-Blackwell, 2003)
The Montreal Protocol restricts production of ozone-depleting halocarbons worldwide. Enforcement of the protocol has relied mainly on annual government statistics of production and consumption of these compounds (bottom-up ...
• #### Effect of Changes in Climate and Emissions on Future Sulfate-Nitrate-Ammonium Aerosol Levels in the United States ﻿

(American Geophysical Union, 2009)
Global simulations of sulfate, nitrate, and ammonium aerosols are performed for the present day and 2050 using the chemical transport model GEOS-Chem. Changes in climate and emissions projected by the IPCC A1B scenario are ...
• #### Effects of 2000-2050 Global Change on Ozone Air Quality in the United States ﻿

(American Geophysical Union, 2008)
We investigate the effects on U.S. ozone air quality from 2000–2050 global changes in climate and anthropogenic emissions of ozone precursors by using a global chemical transport model (GEOS-Chem) driven by meteorological ...
• #### Effects of 2000–2050 Changes in Climate and Emissions on Global Tropospheric Ozone and the Policy-Relevant Background Surface Ozone in the United States ﻿

(American Geophysical Union, 2008)
We use a global chemical transport model (GEOS-Chem) driven by a general circulation model (NASA Goddard Institute for Space Studies GCM) to investigate the effects of 2000–2050 global change in climate and emissions (the ...
• #### Effects of future climate change on regional air pollution episodes in the United States ﻿

(Wiley-Blackwell, 2004)
We examine the impact of future climate change on regional air pollution meteorology in the United States by conducting a transient climate change (1950–2052) simulation in a general circulation model (GCM) of the Goddard ...
• #### Fresh air in the 21st century? ﻿

(Wiley-Blackwell, 2003)
Ozone is an air quality problem today for much of the world's population. Regions can exceed the ozone air quality standards (AQS) through a combination of local emissions, meteorology favoring pollution episodes, and the ...
• #### General circulation model assessment of direct radiative forcing by the sulfate-nitrate-ammonium-water inorganic aerosol system ﻿

(Wiley-Blackwell, 2001)
An on-line simulation of aerosol sulfate, nitrate, ammonium, and water in the Goddard Institute for Space Studies general circulation model (GCM II-prime) has been used to estimate direct aerosol radiative forcing for the ...
• #### Global modeling of tropospheric chemistry with assimilated meteorology: Model description and evaluation ﻿

(Wiley-Blackwell, 2001)
We present a first description and evaluation of GEOS-CHEM, a global threedimensional (3-D) model of tropospheric chemistry driven by assimilated meteorological observations from the Goddard Earth Observing System (GEOS) ...
• #### Impact of 2000–2050 Climate Change on Fine Particulate Matter (PM2.5) Air Quality Inferred from a Multi-Model Analysis of Meteorological Modes ﻿

(European Geosciences Union, 2012)
Studies of the effect of climate change on fine particulate matter (PM2.5) air quality using general circulation models (GCMs) show inconsistent results including in the sign of the effect. This reflects uncertainty in the ...
• #### Impact of increasing heatwaves on U.S. ozone episodes in the 2050s: Results from a multi-model analysis using extreme value theory ﻿

(Wiley-Blackwell, 2016)
We develop a statistical model using extreme value theory to estimate the 2000-2050 changes in ozone episodes across the United States. We model the relationships between daily maximum temperature (Tmax) and maximum daily ...
• #### Impacts of Changes in Land Use and Land Cover on Atmospheric Chemistry and Air Quality over the 21st Century ﻿

(European Geosciences Union, 2012)
The effects of future land use and land cover change on the chemical composition of the atmosphere and air quality are largely unknown. To investigate the potential effects associated with future changes in vegetation ...
• #### Interactions between tropospheric chemistry and aerosols in a unified general circulation model ﻿

(Wiley-Blackwell, 2003)
A unified tropospheric chemistry-aerosol model has been developed within the Goddard Institute for Space Studies general circulation model (GCM). The model includes a detailed simulation of tropospheric ozone-NOx-hydrocarbon ...
• #### Intercontinental influence of NOx and CO emissions on particulate matter air quality ﻿

(Elsevier BV, 2011)
Anthropogenic emissions of nitrogen oxides (NOx ≡ NO + NO2) and carbon monoxide (CO) affect particulate matter (PM) air quality on an intercontinental scale by changing background concentrations of oxidants (OH, ozone, ...
• #### Meteorological Modes of Variability for Fine Particulate Matter (PM2.5) Air Quality in the United States: Implications for PM2.5 Sensitivity to Climate Change ﻿

(European Geosciences Union, 2012)
We applied a multiple linear regression model to understand the relationships of PM2.5 with meteorological variables in the contiguous US and from there to infer the sensitivity of PM2.5 to climate change. We used 2004–2008 ...