People
Principal Investigators
Dr. Andrea J. Fassbender
Research Physical Scientist, PMEL
andrea.j.fassbender@noaa.gov
Andrea Fassbender is a group co-leader of GOBOP, responsible for Argo at PMEL. As an ocean biogeochemist, she uses observations from autonomous platforms, satellites, and ships, as well as output from earth system models, to study ocean productivity and ecosystem health in addition to the ocean's role in global biogeochemical cycles. During her free time she enjoys running, exploring Seattle neighborhoods, spending time with family and friends, and admiring the Pacific Northwest's moss growing capabilities.
Dr. Zachary K. Erickson
Research Oceanographer, PMEL
zachary.k.erickson@noaa.gov
Zachary Erickson is a group co-leader of GOBOP, responsible for the physical oceanography measurements taken by PMEL as part of GO-SHIP. He is broadly interested in interactions between physical and biological systems, with a focus on carbon export processes. Besides working on ship-based hydrography, he also extensively uses data from floats, gliders, and satellites. When not at a computer or on a boat, he is likely enjoying the outdoors on foot or via bicycle, petting his cat while reading a book, or at a piano bench.
Profile | Google Scholar | ORCID | GitHub
Dr. John Lyman
Assistant Researcher, CIMAR
john.lyman@noaa.gov
John Lyman is an Assistant Researcher in GOBOP. He is an oceanographer who is interested in both the dynamics of the ocean and the development of new analysis techniques. John also enjoys snowboarding with his boys, climbing with friends and snorkeling with his wife.
Dr. Jonathan Sharp
Research Scientist, CICOES
jonathan.sharp@noaa.gov
Jon Sharp is a Research Scientist in GOBOP. He joined the group in 2020 after earning his PhD at the University of South Florida. Jon is primarily focused on marine carbonate chemistry, biogeochemical processes, and pairing oceanographic observations with machine learning techniques to create useful data products. In his free time, Jon enjoys hiking, cooking, and supporting any and all Philadelphia sports teams.
Profile | Google Scholar | ORCID | GitHub | ResearchGate
Research Scientists
Dr. Gregory C. Johnson
Affiliate Professor, School of Oceanography, University of Washington
gcj3@uw.edu
Gregory Johnson is now retired from his position of Oceanographer at PMEL, where he was formerly responsible for Core and Deep Argo. He continues to collaborate with GOBOP members on large-scale observational physical oceanography, studying variability of ocean temperature, salinity, and currents, their causes, and effects. When not studying the ocean, he enjoys sailing, painting, and gardening.
Profile | Google Scholar | Publons | ORCID
Hartmut Frenzel
Research Scientist, CICOES
hartmut.frenzel@noaa.gov
Hartmut Frenzel is a Research Scientist in GOBOP. He provides data management, software development, and delayed mode quality control for PMEL BGC Argo floats. Outside of work he enjoys bicycling, running, hiking, kayaking, traveling, and photography.
Profile | Google Scholar | ORCID | GitHub | ResearchGate
Hristina Hristova
Research Scientist, CIMAR
hristina.hristova@noaa.gov
Hristina Hristova is a Research Scientist in GOBOP. She provides delayed mode quality control for the PMEL Core Argo floats, assists with data management and is interested in statistical analysis of large observational and model data sets. Outside of work she enjoys adventuring in the city and the outdoors.
Dr. Elizabeth Steffen
Float Research Coordinator, CIMAR
elizabeth.steffen@noaa.gov
Elizabeth Steffen takes the lead in physical aspects of the floats in GOBOP—testing, shipping, deploying, and in some cases assembling floats. She analyzes their performance in the field in order to improve performance. Away from floats she enjoys the outdoors including anything on or in the water (diving, sailing, swimming, kayaking) and visiting National Parks.
Postdocs
Dr. Mar C. Arroyo
Postdoc, CICOES
mcarroyo@ucsc.edu
Mar Arroyo is a University of Washington CICOES Postdoctoral Scholar in the GOBOP group. Mar is broadly interested in marine carbon and biogeochemical cycling and uses a combination of observational and modeling tools to study carbon cycle feedbacks, ocean acidification, hypoxia, and their potential impacts on marine ecosystem habitability. Outside of research, Mar enjoys urban hikes and exploring Seattle neighborhoods, eating pizza, and going to live rock shows.
Dr. Jacob T. Cohen
Postdoc, CICOES
jtcohen@uw.edu
Jacob Cohen is a CICOES Postdoctoral Scholar in the GOBOP and EcoFOCI groups. He studies the life cycle and biogeochemical impacts of eddies in the Gulf of Alaska in both models and observations. His research interests also include marine heatwaves, Arctic sea ice, and seasonal-to-decadal climate prediction. When he's not at his desk, Jacob enjoys biking, cooking, and playing and coaching ultimate frisbee.
Dr. Hannah Joy-Warren
Postdoc, CICOES
hjoyw@uw.edu
Hannah Joy-Warren is an NSF Office of Polar Programs (OPP) Postdoctoral Fellow in GOBOP, the Marine Phytoplankton and Optics Group in Air-Sea Interactions and Remote Sensing (AIRS) at APL, and the Gray Lab in the School of Oceanography at the University of Washington. She is a polar oceanographer studying the role of phytoplankton species composition in carbon flows. She loves biking with her dog, exploring the mountains, doing ceramics, and playing the ukulele.
Profile | Google Scholar | ORCID | GitHub | ResearchGate
Dr. Stephanie (Steffi) O'Daly
Postdoc, CICOES
sodaly@uw.edu
Steffi O'Daly is a U.S. Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) Postdoctoral Fellow in GOBOP with joint appointments at the University of Washington and NOAA PMEL and collaborators at the University of California Irvine. She is a biogeochemical oceanographer studying drivers of the strength and efficiency of the biological carbon pump in the global ocean. She loves biking, climbing, cooking, and playing with her two tabby cats.
Dr. Mary Margaret V. Stoll
Postdoc, CICOES
mmstoll@uw.edu
Mary Margaret Stoll is a University of Washington CICOES Postdoctoral Scholar in the GOBOP group. Her research focuses on ocean biogeochemistry from multiple perspectives including the biological carbon pump, ecosystem habitability, ocean acidification, and carbon dioxide removal. Her postdoctoral work leverages data products informed by BGC Argo floats and satellite data to better constrain the biological carbon pump and net community production. Outside of research, Mary Margaret enjoys backcountry skiing, eating Italian food, spending time with family and friends, and spotting Mt. Rainier from as many places as possible.
Graduate Students
Nina Buzby
Graduate Student, UW
nbuzby@uw.edu
Nina Buzby is a chemical oceanography Graduate Student in GOBOP and the Gray Lab in the School of Oceanography at the University of Washington. She studies biogeochemical cycling, carbon chemistry, and the influence of detection platforms in quantifying primary productivity. Outside of research, Nina enjoys adventuring with her dog, trying out breweries, or cooking and eating spicy foods.
Stevie Walker
Graduate Student, UW
walkersl@uw.edu
Stevie Walker is a graduate student in the GOBOP lab attending the University of Washington School of Oceanography. Stevie is interested in using observational and model data to study the biological pump and processes related to its role in deep ocean carbon sequestration. In their freetime, Stevie enjoys biking, hiking, climbing, and playing drums and guitar.
Alumni
Researchers
Alexandra Brewer, former JIMAR Float Research Associate at PMEL, now Director of Sustainability at University of Puget Sound
Chanelle Cadot, former JIMAR Float Research Associate at PMEL, now a Physics Teacher at Spanaway Lake High School
Kristy McTaggart, a former Oceanographer at PMEL and long-time member of GOBOP, is now retired
Postdoctoral Scholars
Dr. Marin Cornec, former UW and CICOES Postdoctoral Scholar at PMEL, now a Postdoctoral Scholar at the Laboratoire d'Océanographie de Villefranche
Dr. Donata Giglio, former JISAO Postdoctoral Scholar at PMEL, now an Assistant Professor at the University of Colorado Boulder
Dr. Yibin Huang, former UCSC Prostdoctoral Scholar at PMEL, now an Associate Professor in the Department of Marine Chemistry at Xiamen University
Dr. Jannes Koelling, former CICOES Postdoctoral Fellow at PMEL, now an Acting Instructor at the University of Washington
Dr. Marion Meinvielle, former NRC Postdoctoral Scholar at PMEL, present position unknown
Dr. Lauren Moseley, former CICOES Postdoctoral Scholar at PMEL, now the OAEMIP Research Fellow with the Carbon to Sea Initiative
Dr. Sunke Schmidtko, former NRC Postdoctoral Scholar at PMEL, now at GEOMAR
Dr. Bernadette Sloyan, former NRC Postdoctoral Scholar at PMEL, now a Chief Research Scientist at CSIRO's Oceans and Atmosphere
Dr. Annie Wong, former NRC Postdoctoral researcher and JIMAR assistant researcher at PMEL, now a Senior Research Scientist at the University of Washington
Dr. Yang Xiang, former CICOES Postdoctoral Fellow at PMEL, now an Assistant Professor in the Department of Oceanography & Coastal Sciences at Louisiana State University
Dr. Hannah Zanowski, former JISAO Postdoctoral Scholar at PMEL, now an Assistant Professor at University of Wisconsin-Madison
Graduate Students
Dr. Mar Arroyo, former University of California Santa Cruz Graduate Student at PMEL, now a Postdoctoral Scholar at PMEL
Kimberly Gottschalk, former University of Washington School of Oceanography Graduate Student at PMEL, Public Service Assistant at King County Library System.
Dr. Paige Lavin, former University of Washington School of Oceanography Graduate Student at PMEL, now an Assistant Research Scientist at University of Maryland-College Park
Dr. Sarah Purkey, former University of Washington School of Oceanography Graduate Student at PMEL, now a Professor of Oceanography at the Scripps Institution of Oceanography
Dr. Mary Margaret Stoll, former University of Washington School of Oceanography Graduate Student at PMEL, now a Postdoctoral Scholar at PMEL
Amy Wirts, former University of Washington School of Oceanography Graduate Student at PMEL, now Coastal Lands Program Coordinator with Hawaiʻi Sea Grant and the Department of Land and Natural Resources' (DLNR) Office for Conservation and Coastal Lands (OCCL)
Undergraduate Interns
Reese Barrett, 2022 Hollings Scholarship Summer Intern at PMEL, now a Graduate Student at the University of Washington
Dr. Abigail Birnbaum, former Hollings Scholarship Summer Intern at PMEL, now a Post Doctoral Associate at Pacific Northwest National Laboratory
Tina Chen, former Hollings Scholarship Summer Intern at PMEL, present position unknown
Sonja Giardina, 2023 Hollings Scholarship Summer Intern at PMEL, current undergraduate at University of Hawaiʻi at Mānoa
Sarah Packman, former Lapenta Scholarship Summer Intern at PMEL, now a Graduate Student at the MIT/WHOI Joint Program in Oceanography
Isabel Thornberry, 2023 Hollings Scholarship Summer Intern at PMEL, recent graduate of Haverford College
Dr. Madeleine Youngs, former Hollings Scholarship Summer Intern at PMEL, now an Assistant Professor in the Department of Atmospheric and Oceanic Science, University of Maryland