Land surface states indicate climate variability and affect atmospheric composition (e.g., reactive trace gases, carbon dioxide, methane, and aerosols), which feeds back to the climate and the land surface conditions. The proposed session welcomes the submission of abstracts on studying the connections between land surface conditions and atmospheric composition using diverse observations (ground, aircraft, and satellites), modeling, and data assimilation. These studies can be on small to large temporal and spatial scales.

Soil dust from a variety of sources contributes a major fraction to the atmospheric aerosol and has strong impacts on the environment, the weather systems, and the global climate. The goal of this session is to bring together scientists from different disciplines working on the emission, atmospheric transport, transformation, physical, and chemical characterization, as well as cloud, weather, and climate impacts of soil dust from deserts, semi-arid regions, or agricultural areas. Of particular interest are questions about the speciation and atmospheric impact of different mineral, organic, and biological components in the soil dust of different origin. We invite and welcome laboratory, field, and modeling contributions from the general areas of (1) mineralogy, organic content, and other constituents of dust sampled from source regions or directly from the atmosphere; (2) emission fluxes, transport, and chemical transformation of dust in the atmosphere; and (3) cloud, weather, and climate impact, including optical properties and cloud microphysics like CCN activation and heterogeneous ice nucleation.

Ammonia is a key ingredient in many of today's air quality challenges.  It is an important contributor to fine particle formation and to excess nitrogen deposition.  Because it is not a regulated pollutant, its atmospheric concentrations, sources, and sinks are not as well known as for many other air pollutants.  This session seeks to highlight ongoing research efforts that add to our knowledge of atmospheric ammonia, its sources, and its environmental impacts.  Topics of interest include efforts to characterize ammonia sources, new efforts to measure ammonia concentrations in the ambient atmosphere, studies of ammonia contributions to fine particle and haze formation, and contributions of ammonia to nitrogen deposition.  Both observational (in situ and remote sensing) and model-based investigations are welcome.

Ammonia is a key ingredient in many of today's air quality challenges.  It is an important contributor to fine particle formation and to excess nitrogen deposition.  Because it is not a regulated pollutant, its atmospheric concentrations, sources, and sinks are not as well known as for many other air pollutants.  This session seeks to highlight ongoing research efforts that add to our knowledge of atmospheric ammonia, its sources, and its environmental impacts.  Topics of interest include efforts to characterize ammonia sources, new efforts to measure ammonia concentrations in the ambient atmosphere, studies of ammonia contributions to fine particle and haze formation, and contributions of ammonia to nitrogen deposition.  Both observational (in situ and remote sensing) and model-based investigations are welcome.

Aerosol–cloud interactions have significant influences on natural climate variability and are also one of the largest uncertainties in the estimate of anthropogenic climate forcing. This session seeks presentations of recent research work that advances the understanding of how various aerosol–cloud interactions impact the local and/or global radiative energy budget and consequent implications for climate change. We welcome discussion forums related to i) how microphysical interactions between aerosol and cloud modulate the cloud radiative properties and radiative effects (e.g., Twomey and lifetime effect), ii) how the relative position of aerosol and cloud (e.g., aerosol above, below, and inside clouds) influences the radiative energy distribution, and iii) novel measurement (remote sensing and in situ) and modeling techniques to quantify the impacts of aerosol–cloud interactions on radiation.

2018 Haurwitz Lecture

Core Science Keynote Presentations

This is the poster presentation session for the 20th Conference on Atmospheric Chemistry,  organized by the AMS Committee on Atmospheric Chemistry.

The Robert T. Ryan Symposium will conclude with a cocktail reception welcoming symposium attendees, along with Bob's numerous colleagues and former interns from across the weather enterprise. With a short program hosted by symposium co-chair and AMS Fellow Veronica Johnson of WJLA in Washington, D.C., this casual event will honor Bob for his distinguished career, achievements, and contributions to the American Meteorological Society.

This session welcomes studies funded by, but not limited to, NASA’s Atmospheric Composition Modeling and Analysis Program (ACMAP) and Aura Science Team (AST). In particular, studies related to global and regional modeling and/or satellite data analysis in the areas of atmospheric chemistry, air quality, and the oxidation efficiency in the troposphere; stratospheric chemistry and ozone depletion; and interactions between atmospheric chemistry, weather, and the climate are welcome. Studies of long-term trends in atmospheric composition are also of interest, where the connection between the cause and effect is elucidated using models. The session is also interested in studies that integrate observations from NASA instruments with models to address attribution and predictions. Use of satellite and suborbital datasets and ground-based measurements are encouraged for modeling constraints and verification where applicable.

The NASA Atmospheric Tomography (ATom) mission has embarked on a unique global transect of tropospheric chemistry, measuring a full suite of reactive gases and aerosols along curtains through the remote Pacific and Atlantic Ocean basins.  These ocean basins comprise most of the photochemical activity of the troposphere, controlling the global abundances of many species such as methane and tropospheric ozone.  By the time of this session, three of the four-season deployments will be completed and the datasets from the first two deployments will be publicly available. We invite presentations using ATom data, including in combination with other data, that examine the global scope of tropospheric gases and aerosols, particularly considering the evidence for and impacts of distant pollution sources on the oceanic atmosphere.

This session welcomes studies funded by, but not limited to, NASA’s Atmospheric Composition Modeling and Analysis Program (ACMAP) and Aura Science Team (AST). In particular, studies related to global and regional modeling and/or satellite data analysis in the areas of atmospheric chemistry, air quality, and the oxidation efficiency in the troposphere, stratospheric chemistry, and ozone depletion, and interactions between atmospheric chemistry, weather, and the climate are welcome. Studies of long-term trends in atmospheric composition are also of interest, where the connection between cause and effect is elucidated using models. The session is also interested in studies that integrate observations from NASA instruments with models to address attribution and predictions. Use of satellite and suborbital datasets and ground-based measurements are encouraged for modeling constraints and verification where applicable.

The NASA Atmospheric Tomography (ATom) mission has embarked on a unique global transect of tropospheric chemistry, measuring a full suite of reactive gases and aerosols along curtains through the remote Pacific and Atlantic Ocean basins.  These ocean basins comprise most of the photochemical activity of the troposphere, controlling the global abundances of many species such as methane and tropospheric ozone.  By the time this sessions begins, three of the four-season deployments will be completed and the datasets from the first two deployments will be publicly available. We invite presentations using ATom data, including in combination with other data, that examine the global scope of tropospheric gases and aerosols, particularly considering the evidence for and impacts of distant pollution sources on the oceanic atmosphere.

This session welcomes studies funded by, but not limited to, NASA’s Atmospheric Composition Modeling and Analysis Program (ACMAP) and Aura Science Team (AST). In particular, studies related to global and regional modeling and/or satellite data analysis in the area of atmospheric chemistry, air quality, and the oxidation efficiency in the troposphere; stratospheric chemistry and ozone depletion; and interactions between atmospheric chemistry, weather, and the climate are welcome. Studies of long-term trends in atmospheric composition are also of interest, where the connection between cause and effect is elucidated using models. The session is also interested in studies that integrate observations from NASA instruments with models to address attribution and predictions. Use of satellite and suborbital datasets and ground-based measurements are encouraged for modeling constraints and verification where applicable.

The NASA Atmospheric Tomography (ATom) mission has embarked on a unique global transect of tropospheric chemistry, measuring a full suite of reactive gases and aerosols along curtains through the remote Pacific and Atlantic Ocean basins.  These ocean basins comprise most of the photochemical activity of the troposphere, controlling the global abundances of many species such as methane and tropospheric ozone.  By the time this session begins, three of the four-season deployments will be completed and the datasets from the first two deployments will be publicly available. We invite presentations using ATom data, including in combination with other data, that examine the global scope of tropospheric gases and aerosols, particularly considering the evidence for and impacts of distant pollution sources on the oceanic atmosphere.

We encourage all attendees to take the opportunity to grab a snack and coffee and spend this extended afternoon break networking with colleagues and viewing the hundreds of posters on display in the poster hall. Poster displays are grouped by conference and change each day.

Including (i) the roles of plume, puff, Lagrangian particle, and other approaches; (ii) predictions for short averaging times (seconds to minutes) in hazards and other assessments; (iii) long-range transport models; and (iv) use of mesoscale models for providing meteorological data driving applied dispersion models.

This session welcomes studies funded by, but not limited to, NASA’s Atmospheric Composition Modeling and Analysis Program (ACMAP) and Aura Science Team (AST). In particular, studies related to global and regional modeling and/or satellite data analysis in the area of atmospheric chemistry, air quality, and the oxidation efficiency in the troposphere; stratospheric chemistry and ozone depletion; and interactions between atmospheric chemistry, weather, and the climate are welcome. Studies of long-term trends in atmospheric composition are also of interest, where the connection between cause and effect is elucidated using models. The session is also interested in studies that integrate observations from NASA instruments with models to address attribution and predictions. Use of satellite and suborbital datasets and ground-based measurements are encouraged for modeling constraints and verification where applicable.

This session is concerned with the general characterization of bioaerosols and more specifically with the measurement and modeling of their generation, transport, dispersion, and reactivity in the atmosphere.

We encourage all attendees to take the opportunity to grab a snack and coffee and spend this extended afternoon break networking with colleagues and viewing the hundreds of posters on display in the poster hall. Poster displays are grouped by conference and change each day.

This is the poster presentation session for 20ATmChem organized by the AMS Committee of Atmospheric Chemistry

The NASA Atmospheric Tomography (ATom) mission has embarked on a unique global transect of tropospheric chemistry, measuring a full suite of reactive gases and aerosols along curtains through the remote Pacific and Atlantic Ocean basins.  These ocean basins comprise most of the photochemical activity of the troposphere, controlling the global abundances of many species such as methane and tropospheric ozone.  By the time this session begins, three of the four-season deployments will be completed and the datasets from the first two deployments will be publicly available. We invite presentations using ATom data, including in combination with other data, that examine the global scope of tropospheric gases and aerosols, particularly considering the evidence for and impacts of distant pollution sources on the oceanic atmosphere.

It is now well recognized that international and global flows of pollutants contribute to ozone and aerosol pollution observed at the regional and local scales.  However, quantifying the contribution of the long-range transport to observed air pollution and exceedances of ambient standards continues to be a scientific challenge. This session will explore recent and ongoing work to quantify extra-regional contributions to exceedances of air quality standards using global and regional models and the analysis of ground-, aircraft-, and space-based observations. The session will also explore projections of how international and global flows of pollutants are expected to change as a result of changes in global emissions and climate.

This session focuses on the coupling of chemistry and meteorology in chemical transport models for air quality simulations/applications and in particular for ozone and PM2.5 impacts due to large single sources (e.g., power plants). Other key issues include the effects of boundary layer and land surface processes on air quality, the impact of clouds and precipitation on air quality, and modeling processes across scales.

Atmospheric aerosols originate from multiple natural and anthropogenic sources, and their emission strengths depend strongly on a combination of biological, geologic, human, and meteorological factors. Once emitted into the atmosphere, they often form complex mixtures that affect the earth system on multiple spatial and temporal scales. Natural aerosols can undergo volatilization and condensation, aggregation and disaggregation, photochemical reactions, and mixing with other compounds as they are transported downwind leading to heterogeneous structure both chemically and physically. Current studies show that these aerosol mixtures can have strong impacts on human health, ecosystems, global climate, and weather. It is important to understand these complex aerosol mixtures including their chemical make-up, biological implications, and physical properties, as well as their distribution, fate, and transport in the atmosphere. Recent advances in aerosol modeling have opened a wealth of questions pertaining to the relationship of aerosol chemical evolution, new particle formation, compositional influences on cloud microphysics, and radiative balance. Despite these advances, challenges remain with respect to model verification of aerosol distributions and aerosol properties—especially in under-sampled regions of the globe. This session solicits presentations of research studies on naturally occurring aerosols; e.g., mineral dust, wildfire smoke, sea salt, pollen, and biogenic particles, with a focus on multidisciplinary efforts that investigate their emissions strength, source properties, physical complexity and mixtures, chemical transformations, and transport. Many of these aerosols are directly emitted from other parts of the Earth system, but others can also form or be modified in the atmosphere due to interaction with gaseous emissions and photochemical reactions. This is especially the case with biogenic aerosols, where gas phase volatile organic compounds are emitted that may serve as precursors to secondary organic aerosol formation. Presentations that discuss the novel advances in measurement, modeling and analysis of naturally occurring aerosols including the characterization of the composition of aerosol mixtures, quantifying emission strength, understanding transport and photochemical evolution, and estimating their weather, climate, ecological, or health & safety implications are also invited. Through this session, we hope to catalyze discussions on the chemistry, physics, and biology of aerosols from emissions to impacts.

Anthropogenic air pollutant emissions, including those from transportation, industrial, residential, and commercial sectors, as well as from wild fires and prescribed burning, contribute to the long-existing air pollution problems (PM2.5/10, VOCs, O3, NOx, SOx, NH3) around the globe, especially in megacities and in the developing world, in addition to the warming produced by greenhouse gas (GHG) emissions. These pollutants have been found to have profound impacts on public health in terms of mortality, asthma, and heart conditions. These adverse effects may be enhanced in the future due to global climate change. Mitigation of the effects of air pollution and substantial reduction of air pollutant emissions are critical issues facing policymakers to protect public health and society development. This session solicits observational, modeling and/or multi-disciplinary scientific investigations of both aerosol and trace gas (composition) pollutants to address process level understanding of air quality issues and their impacts on human, environmental and agricultural health. Atmospheric constituents of interests include: ground-level ozone (O3), oxides of nitrogen (NOx) and sulfur (SOx), ammonia (NH3), methane (CH4), volatile organic compounds (VOCs), airborne respirable particulate matter (PM2.5), and inhalable particulate matter (PM2.5-PM10).