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Mark DeGraff

Satellite image of green swirls in blue water next to a snow-covered coast
Posted inNews

Iron Emissions Are Shifting a North Pacific Plankton Bloom

by Mark DeGraff 6 August 20256 August 2025

Some of the iron emitted by industrial activity in East Asia is carried by winds into the North Pacific, where it nourishes iron-hungry phytoplankton.

A raging stream in Rocky Mountain National Park in north central Colorado
Posted inNews

Years-Old Groundwater Dominates Spring Mountain Streams

by Mark DeGraff 3 July 20253 July 2025

Alpine rain and snow take much longer to percolate into western U.S. streams than previously thought, adding complexity to long-standing hydrologic models.

View of a wide creek surrounded by trees
Posted inNews

Mobile Bay Has More Branching Brooks Than Shown on Federal Maps

by Mark DeGraff 16 December 202416 December 2024

A more accurate charting of the full extent of stream networks will help land managers better protect U.S. creeks and rivers.

A view of a Washington, D.C., skyline from the Potomac River at night. The Lincoln Memorial (at left) and the Washington Monument (at right) are lit against a purple sky. Over the water of the Potomac appear the text “#AGU24 coverage from Eos.”

Features from AGU Publications

Research Spotlights

Machine Learning Simulates 1,000 Years of Climate

27 August 202527 August 2025
Editors' Highlights

Spacecraft Surveys Shed New Light on Auroral Kilometric Radiation

3 September 20253 September 2025
Editors' Vox

Experienced Researcher Book Publishing: Sharing Deep Expertise

3 September 202526 August 2025
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