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Catch and Release: How Hemispheres Handle Energy through the Seasons in a Warmer World
Using a suite of multi-model climate projections, researchers found that an interhemispheric energy contrast shifts the tropical rain band southward. This leads to a delayed migration of tropical rainfall to the Northern Hemisphere during summer, a seasonal shift that greatly affects climate in the tropics and subtropics.
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Steven Ghan Selected as Fellow of the American Geophysical Union
Steven Ghan, a climate researcher at PNNL for more than 25 years, has been elected to the newest class of Fellows of the American Geophysical Union. No more than 0.01 percent of AGU's total membership—currently around 61,000 globally—receive the Fellow's honor each year. This year's 61 new members come from 21 different countries.
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Indian Monsoon Steers Tropical Cyclones across the Atlantic
Observational and modeling evidence demonstrated that a stronger Indian monsoon drives Atlantic tropical cyclones farther west due to large-scale steering changes. This link implies an increased probability of landfalling hurricanes during a strong monsoon season.
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Measuring the Tropics' Bulging Waistline
In an invited review for Nature Climate Change, scientists examined the rates and possible causes of the expanding width of the tropics. They found the expansion rate is likely at the lower end of the range previously indicated, and that natural climate swings played a larger role than previously thought.
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Eroding Gaps in Understanding the Global Carbon Cycle
Computer models that simulate Earth systems have lacked a way to represent soil erosion processes. PNNL researchers developed a new approach to soil erosion modeling to fill an important missing gap in understanding global carbon cycle processes.
How do human activities and natural systems interact to affect the Earth's climate? Ultimately, that is the question challenging scientists in PNNL’s Atmospheric Sciences & Global Change Division.
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