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Ryan P. Mulligan

Editor, JGR: Oceans

Photo of sand ripples underwater.
Posted inEditors' Highlights

A First Look at How Sand Behaves Inside a Rippled Bed

by Ryan P. Mulligan 11 September 202511 September 2025

A detailed numerical model shows how sediment particles experience wave-driven shear stress inside and above a sea bed with sand ripples.

Two maps from the paper.
Posted inEditors' Highlights

Dual Tsunami Generation from Atmospheric and Oceanic Sources

by Ryan P. Mulligan 24 June 202424 June 2024

The 2022 Tonga volcanic eruption generated waves that propagated across the Pacific Ocean. A new analysis of sea level measurements is used to dissect the difference in wave components from two sources.

World map using color to show the occurrence of extratropical cyclones
Posted inEditors' Highlights

Tracking Ocean Waves from Extratropical Cyclones on Global Scale

by Ryan P. Mulligan 20 January 202318 January 2023

A new way of tracking ocean waves with satellite measurements was developed and applied to extratropical cyclones, revealing the effects of storm characteristics on extreme sea states.

Two figures from the paper that show wave measurements in the presence of sea ice using satellite remote sensing.
Posted inEditors' Highlights

Satellites Remotely Measure Ocean Waves and Sea Ice Interactions

by Ryan P. Mulligan 12 July 202215 September 2025

A new method for using satellite observations from multiple sensors improves measurements of ocean waves as they propagate through and interact with sea ice.

Map showing location of study area (left) and conceptual model of tidally driven mixed sand–mud sediment transport at flood tide (right).
Posted inEditors' Highlights

Unravelling Sands and Muds Suspended in Coastal Environments

by Ryan P. Mulligan 26 July 202129 June 2022

A new study uses the response of optical and acoustic measurements to derive a sediment composition index for prediction of the relative fractions of mixed sediments in suspension.

A view of a bridge, with the New Orleans skyline visible in the distance between the bridge and the water. A purple tint, a teal curved line representing a river, and the text “#AGU25 coverage from Eos” overlie the photo.

Features from AGU Publications

Research Spotlights

Our Ocean’s “Natural Antacids” Act Faster Than We Thought

30 January 202630 January 2026
Editors' Highlights

Cows, Coal, and Chemistry: The Role of Photochemistry in Methane Budget

27 January 202623 January 2026
Editors' Vox

Bridging the Gap: Transforming Reliable Climate Data into Climate Policy

16 January 202616 January 2026
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