Helium isotope ratios and dissolved methane concentrations in a massive hydrothermal plume observed at the Australian-Antarctic Ridge in the Southern Ocean

Tamara Baumberger1, Pamela Barrett2, Anson MacKenzie Antriasian3, Sharon L Walker4, Susan G Merle5, Patrick Monreal6, Nathaniel J. Buck7, Jessalyn E Davis6, Elise Herzfeld6, Hope V Jerris8, Kevin R Arrigo9, Joseph A Resing10 and Randelle M Bundy6, (1)Oregon State University, Cooperative Institute for Marine Resource & Ecosystem Studies, Newport, United States, (2)University of Washington and NOAA/PMEL, Cooperative Institute for Climate, Oceans, and Ecosystem Studies, Seattle, United States, (3)Oregon State University, Newport, United States, (4)NOAA/PMEL, Seattle, United States, (5)Oregon State University, Cooperative Institute for Marine Ecosystem and Resource Studies, Newport, United States, (6)University of Washington, School of Oceanography, Seattle, United States, (7)University of Washington Seattle Campus, School of Oceanography, Seattle, United States, (8)Middlebury College, Earth and Climate Sciences, Middlebury, VT, United States, (9)Stanford University, Earth System Science, Stanford, United States, (10)University of Washington Cooperative Institute for Climate, Ocean & Ecosystem Studies; NOAA Pacific Marine Environmental Laboratory, Seattle, United States