Changes in Circulation and Particle Scavenging in the Amerasian Basin of the Arctic Ocean over the Last Three Decades Inferred from the Water Column Distribution of Geochemical Tracers

Autor: Xiaoxin Yu, Michiel M Rutgers van der Loeff, Mélanie Grenier, Ole Valk, Susan E. Allen, R. Lawrence Edwards, Maureen Soon, K. H. Lepore, S. Bradley Moran, Yanbin Lu, Christelle Not, Roger Francois
Přispěvatelé: Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), University of British Columbia (UBC), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), University of Minnesota [Twin Cities] (UMN), University of Minnesota System
Jazyk: angličtina
Rok vydání: 2022
Předmět:
010504 meteorology & atmospheric sciences
Marine Inorganic Chemistry
temporal evolution
particle flux
Structural basin
Marine Geochemistry
Oceanography
01 natural sciences
Oceanography: Biological and Chemical
Water column
Geochemistry and Petrology
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Arctic Ocean
Earth and Planetary Sciences (miscellaneous)
Amerasian Basin
The Arctic: An AGU Joint Special Collection
14. Life underwater
Scavenging
Arctic Region
Research Articles
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
0105 earth and related environmental sciences
radioisotopes
Radiogenic Isotope Geochemistry
Ocean current
Arctic and Antarctic oceanography
Sediment
Physical and Chemical Properties of Seawater
lateral exchanges
Nutrients and Nutrient Cycling
Radioactivity and Radioisotopes
Oceanography: General
Geophysics
Circulation (fluid dynamics)
Geochemistry
Productivity (ecology)
13. Climate action
Space and Planetary Science
Environmental science
Antarctica
Seawater
Marine Organic Chemistry
Geographic Location
Research Article
Zdroj: Journal of Geophysical Research. Oceans
Journal of Geophysical Research. Oceans, 2019, 124 (12), pp.9338-9363. ⟨10.1029/2019JC015265⟩
ISSN: 2169-9275
2169-9291
DOI: 10.14288/1.0406577
Popis: Since the 1980–1990s, international research efforts have augmented our knowledge of the physical and chemical properties of the Arctic Ocean water masses, and recent studies have documented changes. Understanding the processes responsible for these changes is necessary to be able to forecast the local and global consequences of these property evolutions on climate. The present work investigates the distributions of geochemical tracers of particle fluxes and circulation in the Amerasian Basin and their temporal evolution over the last three decades (from stations visited between 1983 and 2015). Profiles of 230‐thorium (230Th) and 231‐protactinium (231Pa) concentrations and neodymium isotopes (expressed as εNd) measured in the Amerasian Basin prior to 2000 are compared to a new, post‐2000s data set. The comparison shows a large scale decrease in dissolved 230Th and 231Pa concentrations, suggesting intensification of scavenging by particle flux, especially in coastal areas. Higher productivity and sediment resuspension from the shelves appear responsible for the concentration decrease along the margins. In the basin interior, increased lateral exchanges with the boundary circulation also contribute to the decrease in concentration. This study illustrates how dissolved 230Th and 231Pa, with εNd support, can provide unique insights not only into changes in particle flux but also into the evolution of ocean circulation and mixing.
Key Points Concentration decreases of 230Thd and 231Pad suggest an enhancement of particulate scavenging since the 2000s in the Amerasian BasinParticulate scavenging results from higher productivity and sediment resuspension from the shelvesPost‐2000s changes in intermediate and deep layers suggest enhanced lateral mixing between the margins and central areas of the basins
Databáze: OpenAIRE
Externí odkaz: