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Yayınlanmış 1 Ocak 2025 | Sürüm v1
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Dissolved Organic Carbon in Coastal Waters: Global Patterns, Stocks and Environmental Physical Controls

Oluşturanlar

  • 1. Aarhus Univ, Dept Ecosci, Sec Marine Divers & Expt Ecol, Roskilde, Denmark
  • 2. Inst Invest Marinas CSIC, Vigo, Spain
  • 3. Univ Aveiro, Ctr Environm & Marine Studies CESAM, Aveiro, Portugal
  • 4. Univ Republ, Ctr Univ Reg Este, Dept Interdisciplinario Sistemas Costero Marinos, Rocha, Uruguay
  • 5. Univ Las Palmas Gran Canaria, Inst Oceanog & Cambio Global IOCAG, Las Palmas Gran Canaria, Spain
  • 6. Mediterranean Inst Adv Studies CSIC UIB, Esporles, Spain
  • 7. Univ Fed Parana, Ctr Estudos Mar, Pontal Do Parana, Parana, Brazil
  • 8. Ist Sci Marine, CNR, ISMAR, I-34123 Trieste, Italy
  • 9. Southern Cross Univ, Fac Sci & Engn, Ctr Coastal Biogeochem, Lismore, NSW, Australia
  • 10. Natl Oceanog Ctr, Southampton, Hampshire, England
  • 11. Tech Univ Denmark, Natl Inst Aquat Resources, DK-2800 KGS Lyngby, Denmark
  • 12. Australian Inst Marine Sci, Townsville, Qld, Australia
  • 13. Univ Miami, Rosenstiel Sch Marine Atmospher & Earth Sci, Miami, FL 33136 USA
  • 14. Aarhus Univ, Dept Ecosci, Aarhus, Denmark
  • 15. Agrifood & Biosci Inst, Fisheries & Aquat Ecosyst Branch, Belfast, North Ireland

Açıklama

Dissolved organic carbon (DOC) in coastal waters is integral to biogeochemical cycling, but global and regional drivers of DOC are still uncertain. In this study we explored spatial and temporal differences in DOC concentrations and stocks across the global coastal ocean, and how these relate to temperature and salinity. We estimated a global median coastal DOC stock of 3.15 Pg C (interquartile range (IQR) = 0.85 Pg C), with median DOC concentrations being 2.2 times higher than in open ocean surface waters. Globally and seasonally, salinity was the main driver of DOC with concentrations correlated negatively with salinity, without a clear relationship to temperature. DOC concentrations and stocks varied with region and season and this pattern is likely driven by riverine inputs of DOC and nutrients that stimulate coastal phytoplankton production. Temporally, high DOC concentrations occurred mainly in months with high freshwater input, with some exceptions such as in Eastern Boundary Current margins where peaks are related to primary production stimulated by nutrients upwelled from the adjacent ocean. No spatial trend between DOC and temperature was apparent, but many regions (19 out of 25) had aligned peaks of seasonal temperature and DOC, related to increased phytoplankton production and vertical stratification at high temperatures. Links of coastal DOC with salinity and temperature highlight the potential for anthropogenic impacts to alter coastal DOC concentration and composition, and thereby ecosystem status.

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