Particulate organic carbon dynamics in the Gulf of Lion shelf (NW Mediterranean) using a coupled hydrodynamic–biogeochemical model
نویسندگان
چکیده
Abstract. The Gulf of Lion shelf (GoL, NW Mediterranean) is one the most productive areas in Mediterranean Sea. A 3D coupled hydrodynamic–biogeochemical model used to study mechanisms that drive particulate organic carbon (POC) dynamics over shelf. set observations, including temporal series from a coastal station, remote sensing surface chlorophyll a, and glider deployment, validate distribution physical biogeochemical variables model. reproduces time spatial evolution temperature, nitrate concentrations well shows clear annual cycle gross primary production respiration. We estimate an net ∼ 200 × 104 t C yr−1 at scale marked by coast-slope increase with maximal values eastern region. Our results show favoured inputs nutrients imported offshore waters, representing 3 15 times Rhône terms phosphate. In addition, empirical orthogonal function (EOF) decomposition highlights role solar radiation anomalies continental winds favour upwellings, River, changes production. Annual POC deposition (27 yr−1) represents 13 % delivery terrestrial favours front mouth, mean cyclonic circulation increases between 30 50 m depth prodelta west. Mechanisms responsible for export (24 open sea are discussed. off western part, Cap de Creus Lacaze-Duthiers canyon, 37 total export. Maximum obtained during dense water cascading events marine winds. Considering waters only, mainly exported part through inputs, which spread Northern Current favourable wind conditions. GoL appears as autotrophic ecosystem positive source adjacent basin. undergoing future temperature stratification induced climate change could impact trophic status towards deep It crucial develop models predict assess these evolutions.
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ژورنال
عنوان ژورنال: Biogeosciences
سال: 2021
ISSN: ['1726-4189', '1726-4170']
DOI: https://doi.org/10.5194/bg-18-5513-2021