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Key factors driving particulate organic matter fluxes and related nitrogen losses in the main anoxic oxygen minimum zones of the world oceans

Projektbeschreibung

Neue Forschung an Sauerstoffminimumzonen

Sollten Sauerstoffminimumzonen in die europäische Strategie der Meeresbeobachtung einbezogen werden, käme den Ozeanen bei der Abschwächung des Klimawandels und dem Schutz der Fischbestände eine noch größere Rolle zu. Vor diesem Hintergrund wird das EU-finanzierte Projekt NOCEANIC den Stickstoffverlust untersuchen, der durch sinkende Werte von partikulärem organischem Kohlenstoff (POC) zustandekommt. Dies ist ein Kernmechanismus der biogeochemischen Kreisläufe in anoxischen Sauerstoffminimumzonen und nun soll geklärt werden, wodurch er gesteuert wird. NOCEANIC wird Zeitreihen von optischen Ersatzmodellen des POC sowie physikalisch-chemische Daten aus autonomen Messbojen untersuchen. Die Daten werden mit ihrer einzigartig hohen zeitlichen und vertikalen Auslösung neue Erkenntnisse über die biogeochemischen Zusammenhänge zwischen POC-Strömen und Stickstoffverlust liefern.

Ziel

Nitrogen loss fuelled by sinking particulate organic carbon (POC) is a key mechanism that drives biogeochemical cycles in anoxic oxygen minimum zones (OMZs). However, little is known about what controls this mechanism because of the challenges involved in observing it. Noceanic aims to improve current knowledge by exploiting – for the first time – time-series of optical proxies of POC and physicochemical data collected by autonomous profiling floats (i.e. “BGC-Argo”). This data acquired at unprecedented temporal and vertical resolution will generate new insights into the biogeochemical linkages between POC fluxes and N losses. Ultimately, Noceanic will contribute to reducing uncertainties in the mechanistic prediction of N losses and deepen understanding of the biogeochemical response of oceans to ongoing OMZs expansion. Noceanic will combine models, field and remote-sensing data. From field data, optical POC relationships will be tuned and then used to convert optical proxies of POC into POC fluxes. Remote-sensing data will be exploited to model surface POC formed by photosynthesis and assess its source of variability. From these elements, POC fluxes in anoxic OMZs (> 100 m) can then be translated into N losses. Finally, temporal changes in N losses will be explained in terms of the main factors driving the formation of POC and its export to anoxic OMZs. These innovative interdisciplinary activities will establish a two-way exchange of knowledge between the Researcher and the host institution, and enhance their European and international network of collaborators. An expected outcome of Noceanic is its impact on the European strategy for global ocean observations by promoting the inclusion of OMZs – a critical shift because OMZs expansion is affecting the oceans’ role in mitigating the Earth’s climate and the size of fish stocks, ultimately inflicting consequences on European society.

Koordinator

SORBONNE UNIVERSITE
Netto-EU-Beitrag
€ 196 707,84
Adresse
21 RUE DE L'ECOLE DE MEDECINE
75006 Paris
Frankreich

Auf der Karte ansehen

Region
Ile-de-France Ile-de-France Paris
Aktivitätstyp
Higher or Secondary Education Establishments
Links
Gesamtkosten
€ 196 707,84