2016 AMS 19th Conference on Atmospheric Chemistry

Greenhouse Gas Emissions: Quantifying Uncertainties in Measurements and Models and Resultant Climate Impacts

Session Co-Chairs: Scott Denning (Colorado State University), Abhishek Chatterjee (NASA's Goddard Space Flight Center), Sean Crowell (University of Oklahoma), Berrien Moore III (University of Oklahoma)

Session Description: Over the last few years, significant advances have been made in both in situ and remote sensing technologies for measuring greenhouse gases (GHGs). The successful launch of global observing systems such as the Orbiting Carbon Observatory (OCO-2), the Soil Moisture Active Passive (SMAP) missions as well as deployment of localized surface networks and aircraft campaigns such as the Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE) and the Megacities Carbon Project, is starting to yield more information on natural and anthropogenic sources than ever before. While these multiple observational platforms provide a significant potential for the monitoring of GHG emissions, more and more uncertainties are coming to light regarding our understanding of the global and regional budgets of GHGs, errors due to deficiency in atmospheric transport modeling (especially related to convection and vertical mixing), and identification and quantification of climate feedback sensitivities. This session solicits abstracts that address these uncertainties using models and observations and provide new insights on understanding GHG dynamics at various spatial (local to global) and temporal (sub-diurnal to decadal) scales. We encourage contributions on current and prospective observation technologies for GHGs, modeling studies to quantify budgets and/or uncertainties in GHG flux estimates, and evaluation and benchmarking of GHG estimates from Earth System Models using contemporary observations. We also encourage studies of perturbations to the carbon balance of terrestrial ecosystems in response to climate variability and change, especially as they combine models and observations or pertain to carbon-climate feedback. In addition, we seek contributions on improved quantification and understanding of underlying GHG emissions at the urban scale, policy issues related to GHG monitoring and regulation, and how the current state of the science is informing policy decisions.

Atmospheric Chemistry Modeling and Analysis Program (ACMAP)

Session Co-Chairs: Richard Eckman (NASA), Jonathan Jiang (NASA Jet Propulsion Laboratory), Ken Pickering (NASA's Goddard Space Flight Center)

Session Description: This session welcomes studies funded by, but not limited to NASA’s Atmospheric Composition Modeling and Analysis Program (ACMAP). In particular, studies related to global and regional modeling and/or 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 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 data sets and ground-based measurements are encouraged for modeling constraints and verification where applicable.

Atmospheric Convection: Observing Composition and Pollution Transport

Session Co-Chairs: Bryan Duncan (NASA's Goddard Space Flight Center) and Hui Su (NASA Jet Propulsion Laboratory)

Session Description: Atmospheric convection and its impacts on chemical tracer distribution and transport present a significant challenge to modeling of both climate and atmospheric composition. The global and regional impacts of convection on clouds, water vapor and trace gases are large and poorly quantified especially in the upper troposphere, leading to significant uncertainties in radiative forcing and in the impact on global air quality. The goal of this proposed session is to solicit recent global observations from satellite and their applications for improving model simulations of convective transport and associated atmospheric composition. Presentations are particularly encouraged with an assessment of the suitability of current observations and recommendations for stronger ones to constrain pollution vertical and long-range transport.

Secondary Organic Aerosols: Formation, Properties, and Atmospheric Evolution

Session Chair: Alla Zelenyuk (Pacific Northwest National Laboratory)

Session Description: Recent laboratory and field studies provide new insights into the formation, growth, phase, viscosity, and volatility of secondary organic aerosols (SOA). These data indicate that under many atmospherically-relevant conditions SOA particles are significantly more viscous and orders of magnitude less volatile than assumed in traditional modeling approaches; SOA formation yields can be significantly higher than previously reported values; and anthropogenic pollution enhance loadings of SOA from biogenic precursors.

Regional-scale air quality

Session Chair: Jeff Collett (Colorado State University)

Session Description: Variations in meteorology and climate couple with a range of source types and source activity levels to yield a wide range of regional scale air quality challenges around the globe. This session solicits reports from both observational and modeling perspectives on air pollution in different regions within North America and around the globe. Presentations focusing on improving air quality and air quality challenges are both welcome. Relevant air quality issues include, but are not limited to, ozone, fine particles, smoke from wild and prescribed fires, visibility and regional haze, and reactive nitrogen deposition.

Aerosols and Chemistry in Global Climate Models / Climate Variability and Change

Session Co-Chairs: Ben Kirtman (University of Miami), Dan Vimont (University of Wisconsin, Madison)

Session Description: The influence of chemical tracers (e.g. O3, CH4) on climate continues to be a challenge in climate research. This session will be joint with Climate Variability and Change to focus on presentations related to the CMIP6 AerChemMIP experiment or related topics, including but not limited to, evaluation and analysis of the CMIP6 model results and chemistry-climate model simulations using new observations and diagnostics.

Tropical Upper Troposphere Water Vapor, Clouds and Stratospheric Dehydration

Session Co-Chairs: Mark Schoeberl (Science and Technology Corporation), Eric Jensen (NASA AMES Research Center)

Session Description:
Recent observations from aircraft, balloons, and satellites, along with advances in modeling techniques and improved meteorological analyses, are providing new insights into the physical processes controlling clouds and water vapor concentration in the tropical tropopause and lowermost stratosphere. In particular, this session will focus on model and observational investigations addressing the impacts of rapid transport by deep convection, slow diabatic vertical motions, wave-driven temperature oscillations, and cloud microphysics using analyses from recent aircraft and balloon in situ measurements and long-term satellite measurements.

A Soil dust: Lofting, Transport, Characterization, and Interactions with Clouds and Climate

Session Chair: Ottmar Moehler (Karlsruhe Institute of Technology)

Session Description: Dust from both desert and more vegetated areas contributes a major fraction of the atmospheric aerosol with a variety of sources, compositions and impacts. The goal of this session is to bring together scientist from different disciplines working on the characterization, emission, atmospheric transport, chemical transformation and impact of dust from desert, vegetated or agricultural areas, not only including mineral but also organic and other constituents. We invite and welcome contributions from the general areas (1) speciation and characterization of the 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 and climate impact of atmospheric dust, including optical properties and cloud microphysics like CCN activation and heterogeneous ice nucleation.

Air Emissions and Air Quality Impacts From Oil and Gas Development

Session Co-chairs: Arsineh Hecobian (Colorado State University) and Jessica Gilman (NOAA)

Session Description: Improved capabilities for horizontal drilling and hydraulic fracturing over the past decade led to significant increases in unconventional oil and gas production in several regions of the United States. This development has raised concerns regarding emissions of greenhouse gases, air toxics, and precursors to ozone and fine particle formation. This session solicits presentations examining all aspects of air emissions and/or air quality or climate impacts of methane, volatile organic compounds, and nitrogen oxides from all stages of oil and gas development.

Morphology and Internal Mixing of Atmospheric Particles

Session Chair: Nicole Riemer (University of Illinois at Urbana-Champaign)

Session Description:
The lack of mechanistic knowledge on several aerosol properties and their complex interactions with clouds and radiation hinders the advance in predictive understanding of climatic and environmental impacts of atmospheric aerosol. Single particle morphology and aerosol mixing states are among those aerosol aspects that are the least known and characterized, due to their complexity and inherent measurement challenges. However, these single-particle aspects influence the aerosol optical properties, as well as various microphysical processes like hygroscopicity and heterogeneous ice nucleation. During the aerosol life cycle, particles experience several atmospheric aging processes, such as restructuring, coagulation and condensation with organic and inorganic materials, and heterogeneous chemical reactions. These processes result in changes in morphology and internal mixing state of individual particles. The significance of these effects and, hence, the impact on atmospheric radiation budget, is largely unconstrained and not well understood.

New experimental, as well as modeling efforts are needed to better understand the role of aerosol morphology and aerosol mixing state. This session focuses on this timely topic, and we welcome both laboratory and field measurements, as well as modeling efforts that investigate the morphology and mixing of atmospheric particles, their chemical and physical interactions with the environment and their effects, for example, on optical properties and microphysical processes.

Themed Joint Session (with 9AEROCLOUD): Grand Challenges in Observing Aerosol-Cloud-Climate Interactions

Session Co-Chairs: Sonia Kreidenweis (Colorado State University), Jiwen Fan (Pacific Northwest National Laboratory) and Jonathan Jiang (NASA Jet Propulsion Laboratory)

Session Description:
We invite contributions discussing the greatest observational needs to advance understanding of aerosol-cloud-climate interactions. Papers addressing the ways in which observations can be used to evaluate modeling studies of aerosol impacts on clouds and climate, and papers discussing processes within numerical models that could be better represented via insights from new observational strategies, are also welcomed. [note to Committee: session will begin with a Core Science Keynote talk; suggestions for speakers will be solicited].