Biogenic sinking particle fluxes and sediment trap collection efficiency at Ocean Station Papa
Estapa, Margaret (University of Maine)
Buesseler, Ken (Woods Hole Oceanographic Institution)
Durkin, Colleen A. (California State University)
Omand, Melissa (University of Rhode Island)
Benitez-Nelson, Claudia (University of South Carolina)
Roca Martí, Montserrat (Woods Hole Oceanographic Institution)
Breves, Elly (Skidmore College. Rensselaer Polytechnic Institute)
Kelly, R. P. (University of Rhode Island)
Pike, Steve (Woods Hole Oceanographic Institution)

Fecha:	2021
Resumen:	Comprehensive field observations characterizing the biological carbon pump (BCP) provide the foundation needed to constrain mechanistic models of downward particulate organic carbon (POC) flux in the ocean. Sediment traps were deployed three times during the EXport Processes in the Ocean from RemoTe Sensing campaign at Ocean Station Papa in August-September 2018. We propose a new method to correct sediment trap sample contamination by zooplankton "swimmers. " We consider the advantages of polyacrylamide gel collectors to constrain swimmer influence and estimate the magnitude of possible trap biases. Measured sediment trap fluxes of thorium-234 are compared to water column measurements to assess trap performance and estimate the possible magnitude of fluxes by vertically migrating zooplankton that bypassed traps. We found generally low fluxes of sinking POC (1. 38 + 0. 77 mmol C m-2 d-1 at 100 m, n ¼ 9) that included high and variable contributions by rare, large particles. Sinking particle sizes generally decreased between 100 and 335 m. Measured 234Th fluxes were smaller than water column 234Th fluxes by a factor of approximately 3. Much of this difference was consistent with trap undersampling of both small (<32 mm) and rare, large particles (.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Biological carbon pump ; Carbon flux ; Ocean station papa ; Particle size distribution ; Sediment traps ; Swimmers
Publicado en:	Elementa (Washington DC), Vol. 9, Issue 1 (June 2021) , art. 00122, ISSN 2325-1026

DOI: 10.1525/elementa.2020.00122

24 p, 755.7 KB

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