An operational overview of the EXport processes in the ocean from RemoTe sensing (EXPORTS) northeast pacific field deployment

David A. Siegel, Ivona Cetinić, Jason R. Graff, Craig M. Lee, Norman Nelson, Mary Jane Perry, Inia Soto Ramos, Deborah K. Steinberg, Ken Buesseler, Roberta Hamme, Andrea J. Fassbender, David Nicholson, Melissa M. Omand, Marie Robert, Andrew Thompson, Vinicius Amaral, Michael Behrenfeld, Claudia Benitez-Nelson, Kelsey Bisson, Emmanuel BossPhilip W. Boyd, Mark Brzezinski, Kristen Buck, Adrian Burd, Shannon Burns, Salvatore Caprara, Craig Carlson, Nicolas Cassar, Hilary Close, Eric D'Asaro, Colleen Durkin, Zachary Erickson, Margaret L. Estapa, Erik Fields, James Fox, Scott Freeman, Scott Gifford, Weida Gong, Deric Gray, Lionel Guidi, Nils Haëntjens, Kim Halsey, Yannick Huot, Dennis Hansell, Bethany Jenkins, Lee Karp-Boss, Sasha Kramer, Phoebe Lam, Jong Mi Lee, Amy Maas, Olivier Marchal, Adrian Marchetti, Andrew McDonnell, Heather McNair, Susanne Menden-Deuer, Francoise Morison, Alexandria K. Niebergall, Uta Passow, Brian Popp, Geneviève Potvin, Laure Resplandy, Montserrat Roca-Martí, Collin Roesler, Tatiana Rynearson, Shawnee Traylor, Alyson Santoro, Kanesa Duncan Seraphin, Heidi M. Sosik, Karen Stamieszkin, Brandon Stephens, Weiyi Tang, Benjamin van Mooy, Yuanheng Xiong, Xiaodong Zhang

Research output: Contribution to journalReview articlepeer-review

3 Scopus citations

Abstract

The goal of the EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) field campaign is to develop a predictive understanding of the export, fate, and carbon cycle impacts of global ocean net primary production. To accomplish this goal, observations of export flux pathways, plankton community composition, food web processes, and optical, physical, and biogeochemical (BGC) properties are needed over a range of ecosystem states. Here we introduce the first EXPORTS field deployment to Ocean Station Papa in the Northeast Pacific Ocean during summer of 2018, providing context for other papers in this special collection. The experiment was conducted with two ships: a Process Ship, focused on ecological rates, BGC fluxes, temporal changes in food web, and BGC and optical properties, that followed an instrumented Lagrangian float; and a Survey Ship that sampled BGC and optical properties in spatial patterns around the Process Ship. An array of autonomous underwater assets provided measurements over a range of spatial and temporal scales, and partnering programs and remote sensing observations provided additional observational context. The oceanographic setting was typical of late-summer conditions at Ocean Station Papa: a shallow mixed layer, strong vertical and weak horizontal gradients in hydrographic properties, sluggish sub-inertial currents, elevated macronutrient concentrations and low phytoplankton abundances. Although nutrient concentrations were consistent with previous observations, mixed layer chlorophyll was lower than typically observed, resulting in a deeper euphotic zone. Analyses of surface layer temperature and salinity found three distinct surface water types, allowing for diagnosis of whether observed changes were spatial or temporal. The 2018 EXPORTS field deployment is among the most comprehensive biological pump studies ever conducted. A second deployment to the North Atlantic Ocean occurred in spring 2021, which will be followed by focused work on data synthesis and modeling using the entire EXPORTS data set.

Original languageEnglish (US)
Article number9
JournalElementa
Volume9
Issue number1
DOIs
StatePublished - Jul 7 2021

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Environmental Engineering
  • Ecology
  • Geotechnical Engineering and Engineering Geology
  • Geology
  • Atmospheric Science

Keywords

  • Biological pump
  • Carbon cycle
  • Export pathways
  • NASA field campaign
  • NPP fates
  • Organic carbon export

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