People
Principal Investigators
Dr. Gregory C. Johnson
Oceanographer, PMEL
gregory.c.johnson@noaa.gov
Gregory Johnson is a group co-leader of GOBOP, responsible for Core and Deep Argo at PMEL. A large-scale observational physical oceanographer, he studies the roles of the ocean in climate, including variations of ocean temperature, salinity, and currents, their causes, and effects. When not working he enjoys sailing, painting, and gardening.
Profile | Google Scholar | Publons | ORCID
Dr. Andrea J. Fassbender
Research Physical Scientist, PMEL
andrea.j.fassbender@noaa.gov
Andrea Fassbender is a group co-leader of GOBOP, responsible for Biogeochemical 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 the ocean's role in global climate. During her free time she enjoys playing Co Rec soccer, 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
Research Scientists
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. 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.
Kristy McTaggart
Oceanographer, PMEL
kristene.e.mctaggart@noaa.gov
Kristy McTaggart is a Physical Oceanographer in GOBOP. She is CTD lead for all NOAA GO-SHIP lines, and also performs delayed-mode quality control of PMEL Argo float data. Kristy enjoys foreign travel, photography, hiking, and walks with friends.
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
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. Marin Cornec
Postdoc, UW
marin.cornec@noaa.gov
Marin Cornec is a Postdoctoral Scholar in GOBOP with joint appointments at the University of Washington and NOAA PMEL. He is interested in assessing and quantifying phytoplankton-related biological processes and their implications in the biological carbon pump using a combination of observational data. In his free time, he enjoys hiking, scuba diving, going to movies, and visiting breweries.
ORCID | GitHub | ResearchGate
Dr. Hannah Joy-Warren
Postdoc, CICOES
hjoyw@uw.edu
Hannah Joy-Warren is a CICOES Postdoctoral Research Fellow in GOBOP 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. Jannes Koelling
Postdoc, CICOES
jannes@uw.edu
Jannes Koelling is a CICOES Postdoctoral Research Fellow in GOBOP and the Gray Lab in the School of Oceanography at the University of Washington. His main research focus is ocean ventilation in the subpolar North Atlantic Ocean, studying how air-sea gas exchange, physical transport, and biological production and consumption control the amount of oxygen that enters the deep ocean. His favorite non-science activities are playing soccer, baking, and going to the mountains to hike, backpack, or snowboard.
Dr. Paige Lavin
Postdoc, U. of Maryland
Paige.Lavin@noaa.gov
Paige Lavin is a Postdoctoral Research Associate at the Cooperative Institute for Satellite Earth System Studies (CISESS) at the University of Maryland and NOAA's Laboratory for Satellite Altimetry. She is a Visiting Scientist in GOBOP and received her PhD in Oceanography from the University of Washington in 2021. Paige is a large-scale physical oceanographer who combines in-situ and satellite observations to study ocean heat content and sea level rise, often using machine learning methods. She is currently a member of the NASA Ocean Surface Topography Science Team. In her free time, she enjoys cooking, photography, traveling, and playing sports.
Publons | ORCID | ResearchGate
Dr. Yang Xiang
Postdoc, CICOES
yaxiang@uw.edu
Yang Xiang is a CICOES Postdoctoral Research Fellow in GOBOP and the Quay Lab in the School of Oceanography at the University of Washington. He is a chemical oceanographer studying the composition of marine particles and its roles in the ocean carbon cycle through processes such as scavenging, regeneration, and sinking. In his free time, he enjoys travelling, hiking, watching and playing sports.
Graduate Students
Mar Arroyo
Graduate Student, UCSC
mcarroyo@ucsc.edu
Mar Arroyo is a PhD Student in GOBOP attending the University of California Santa Cruz. Mar is interested in marine carbonate chemistry and uses a combination of observational and model data to study coastal carbon cycling and ocean acidification. He also enjoys biking, listening to music, and trying new breakfast cereals.
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 is interested in the impacts of climate change on biogeochemical cycling and carbon chemistry, and is studying 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.
Mary Margaret Stoll
Graduate Student, UW
mmstoll@uw.edu
Mary Margaret Stoll is a chemical oceanography graduate student at the University of Washington in the School of Oceanography and is a member of both the PMEL GOBOP and Carbon Groups. She is interested in studying ocean biogeochemistry from a variety of perspectives including ecosystem habitability, climate change impacts, and carbon dioxide removal. Outside of research, Mary Margaret enjoys skiing, playing field hockey, spending time with family and friends, and spotting Mt. Rainier from as many places as possible.
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 a Forests COI Manager at the Puyallup Watershed Initiative
Chanelle Cadot, former JIMAR Float Research Associate at PMEL, now a Field Engineer at the University of Washington, Applied Physics Laboratory
Postdoctoral Scholars
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. Marion Meinvielle, former NRC Postdoctoral Scholar at PMEL, present position unknown
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. Hannah Zanowski, former JISAO Postdoctoral Scholar at PMEL, now an Assistant Professor at University of Wisconsin-Madison
Graduate Students
Kimberly Gottschalk, former University of Washington School of Oceanography Graduate Student at PMEL, present position unknown
Dr. Paige Lavin, former University of Washington School of Oceanography Graduate Student at PMEL, now a Postdoctoral Research Associate at University of Maryland-College Park
Dr. Sarah Purkey, former University of Washington School of Oceanography Graduate Student at PMEL, now an Assistant Professor of Oceanography at the Scripps Institution of Oceanography
CDR Amy Wirts, former University of Washington School of Oceanography Graduate Student at PMEL, now at the US Coast Guard
Undergraduate Interns
Reese Barrett, 2022 Hollings Scholarship Summer Intern at PMEL, now a Graduate Student at the University of Washington
Abigail Birnbaum, former Hollings Scholarship Summer Intern at PMEL, now a Graduate Student at Tufts University
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
Dr. Madeleine Youngs, former Hollings Scholarship Summer Intern at PMEL, now a NOAA Climate and Global Change Postdoctoral Fellow at NYU
Sarah Packman, 2023 Lapenta Scholarship Summer Intern at PMEL, current undergraduate at Harvard University
Isabel Thornberry, 2023 Hollings Scholarship Summer Intern at PMEL, current undergraduate at Haverford College