The presence of nitryl chloride in polluted urban air can enhance the production of ozone by up to 41%, according to a new modeling study constrained by ground-based measurements.

Terri Cook
Terri Cook is an award-winning freelance writer whose career has focused on exploring and explaining the 4.5-billion-year-history of the remarkable planet we live on. Cook, who has an M.S. degree in Earth science from the University of California, Santa Cruz, writes about geology, ecology, and the environment—as well as wine, tea, hiking, and biking—for a diverse group of publications, including Eos, Scientific American, NOVA Next, Science News, and EARTH magazine, as well as Avalon Travel and numerous other travel-related publications. Her reporting has taken her to 25 states and 20 countries scattered across 5 continents, from the depths of the Grand Canyon to the sandy Australian Outback to the mist-shrouded summit of Bali’s Mount Batur. As the coauthor of three popular guidebooks, including Hiking the Grand Canyon’s Geology and Geology Underfoot Along Colorado’s Front Range, Cook gives frequent presentations about geology and science communication. She is the recipient of a 2016 European Geosciences Union Science Journalism Fellowship and is based in beautiful Boulder, Colo.
Evidence of an Extinct Ocean Basin Detected Beneath Greenland
An analysis of a seismic and gravity anomaly discovered in the middle mantle sheds new light on ancient oceans, the mantle's evolution, and ancient magmatism in the Arctic.
Toward a Reassessment of Daily Temperature Range Trends
To reduce the uncertainty associated with this important climate change index, recent studies have developed a new diurnal temperature range data set and compared the results to previous estimates.
Evaluating the Impact of Maryland's Healthy Air Act
Reducing emissions of short-lived gaseous sulfur pollutants from power plants had an immediate, local benefit, but controlling longer-lasting harmful particulate matter will require regional action.
Was the Recent Slowdown in Surface Warming Predictable?
The temporary deceleration in warming across the Northern Hemisphere earlier this century could not have been foreseen by statistical forecasting methods, a new study concludes.
How Much Dissolved Mercury Is Present in Streams?
The results of a new study suggest that an improved understanding of the processes mobilizing mercury in soils will be necessary to predict water quality impacts.
Understanding the Distribution of Juvenile Jumbo Squid
An expanding zone of shallow, oxygen-depleted water in the eastern tropical Pacific Ocean may be vertically restricting the habitat of this important source of food, according to a recent study.
A Decade of Progress in Stratospheric Aerosol Research
Enhanced technology and chemistry-climate models have advanced our understanding of the sources and processes controlling the evolution of the stratospheric aerosol layer, the so-called Junge layer.
Are U.S. States Prepared to Manage Water in a Changing Climate?
An empirical study of water allocation and planning in five states concludes that they lack a statewide strategy to manage the impacts of climate change on water resources.
Improving the Identification of Extreme Precipitation Trends in the U.S.
By greatly reducing the associated uncertainty, a new model is better able to discern statistically significant trends, offering the potential to improve the seasonal forecasting of rare events.