Seasonal record for alkenones in sedimentary particles from the Gulf of Maine |
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| Institution: | 1. College of Oceanic and Atmospheric Sciences, Oregon State University, Oceanography Admin. Building 104, Corvallis, OR 97331-5503, USA;2. School of Marine Sciences, University of Maine, Orono, ME 04469, USA;1. Division of Nephrology, Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas;2. Renal Section Medicine Service, South Texas Veteran Health Care System, San Antonio, Texas;3. Department of Life Sciences, Laboratory of Pharmacology and Toxicology, University of Siena, Siena, Italy;4. School of Health Professions, University of Texas Health Science Center at San Antonio, San Antonio, Texas;5. Division of Diabetes, Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas;7. Nephrology and Hypertension Unit, Western Galilee Hospital, Nahariya, Israel;11. Department of Epidemiology and Biostatistics, University of Texas Health Science Center at San Antonio, San Antonio, Texas;12. Department of Medicine, University of Pisa, Pisa, Italy;1. Institute of Earth Sciences, Ruprecht Karls University Heidelberg, Im Neuenheimer Feld 234-236, D-69120 Heidelberg, Germany;2. Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, D-55128 Mainz, Germany;3. Institute for Geosciences, Johannes Gutenberg University Mainz, Johann-Joachim-Becher-Weg 21, D-55099 Mainz, Germany;4. Department of Geography, Johannes Gutenberg University Mainz, Johann-Joachim-Becher-Weg 21, D-55099 Mainz, Germany;1. Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany;2. Riemann Center for Geometry and Physics, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany;1. NOAA-Fisheries, Northwest Fisheries Science Center, Hatfield Marine Science Center, Newport, OR, United States;2. Cooperative Institute for Marine Resources Studies, Oregon State University, Hatfield Marine Science Center, Newport, OR, United States;1. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;2. Sanya Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China;1. Department of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University, Den Burg, the Netherlands;2. Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, the Netherlands |
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| Abstract: | C37–39 alkenones and C36 alkenoates, biomarkers of haptophyte origin, were measured in a 10-month sediment trap times series from the Wilkinson Basin in the Gulf of Maine (GOM). Highest biomarker flux to the seabed was observed in summertime, the period when surface waters are stratified and a persistent, subsurface chlorophyll maximum (SCM) exists within the upper thermocline and at the base of the euphotic zone throughout the GOM. Comparison of biomarker content and composition of sediment trap particles and underlying surface sediments indicates significant loss (>50%) of signal due to the impact of early diagenesis. Despite such loss, however, C37 alkenone unsaturation patterns (U37K′) are not altered. Estimates of algal growth temperature made from analysis of U37K′ in these sedimentary materials correspond with water temperature measured at the SCM, identifying this biological oceanographic feature as a key site of alkenone export production to the GOM sediment record. Given the common occurrence of SCM in surface waters of the world ocean, particularly the expansive oligotrophic regions of the subtropical to temperate ocean, export of alkenones produced within such features is a potentially widespread biological oceanographic phenomenon which shapes the sediment record for these biomarkers. |
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