Hofmann, Andreas F. und Peltzer, Edward T. und Brewer, Peter G. (2012) Kinetic bottlenecks to chemical exchange rates for deep-sea animals – Part 1: Oxygen. Biogeosciences Discussion (BGD) (9), Seiten 13817-13856. Copernicus Publications. doi: 10.5194/bgd-9-13817-2012.
Dies ist die aktuellste Version dieses Eintrags.
![]()
|
PDF
889kB |
Offizielle URL: http://www.biogeosciences-discuss.net/9/13817/2012/
Kurzfassung
Ocean warming will reduce dissolved oxygen concentrations which can pose challenges to marine life. Oxygen limits are traditionally reported simply as a static concentration thresholds with no temperature, pressure or flow rate dependency. Here we treat the oceanic oxygen supply potential for heterotrophic consumption as a dynamic molecular exchange problem analogous to familiar gas exchange processes at the sea surface. A combination of the purely physico-chemical oceanic properties temperature, hydrostatic pressure, and oxygen concentration defines the ability of the ocean to supply oxygen to any given animal. This general oceanic oxygen supply potential is modulated by animal specific properties such as the diffusive boundary layer thickness to define and limit maximal oxygen supply rates. Here we combine all these properties into formal, mechanistic equations defining novel oceanic properties that subsume various relevant classical oceanographic parameters to better visualize, map, comprehend, and predict the impact of ocean deoxygenation on aerobic life. By explicitly including temperature and hydrostatic pressure into our quantities, various ocean regions ranging from the cold deep-sea to warm, coastal seas can be compared. We define purely physico-chemical quantities to describe the oceanic oxygen supply potential, but also quantities that contain organism-specific properties which in a most generalized way describe general concepts and dependencies. We apply these novel quantities to example oceanic profiles around the world and find that temperature and pressure dependencies of diffusion and partial pressure create zones of greatest physical constriction on oxygen supply typically at around 1000m depth, which coincides with oxygen concentration minimum zones. In these zones, which comprise the bulk of the world ocean, ocean warming and deoxygenation have a clear negative effect for aerobic life. In some shallow and warm waters the enhanced diffusion and higher partial pressure due to higher temperatures might slightly overcompensate for oxygen concentration decreases due to decreases in solubility.
elib-URL des Eintrags: | https://elib.dlr.de/78400/ | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||
Titel: | Kinetic bottlenecks to chemical exchange rates for deep-sea animals – Part 1: Oxygen | ||||||||||||||||
Autoren: |
| ||||||||||||||||
Datum: | 11 Oktober 2012 | ||||||||||||||||
Erschienen in: | Biogeosciences Discussion (BGD) | ||||||||||||||||
Open Access: | Ja | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||
DOI: | 10.5194/bgd-9-13817-2012 | ||||||||||||||||
Seitenbereich: | Seiten 13817-13856 | ||||||||||||||||
Verlag: | Copernicus Publications | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | deep-sea gas exchange, kinetic limitation, diffusion, limits to marine life, hypoxia | ||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||
HGF - Programm: | Rationelle Energieumwandlung und Nutzung (alt) | ||||||||||||||||
HGF - Programmthema: | Brennstoffzelle (alt) | ||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||
DLR - Forschungsgebiet: | E EV - Energieverfahrenstechnik | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Elektrochemische Prozesse (alt) | ||||||||||||||||
Standort: | Stuttgart | ||||||||||||||||
Institute & Einrichtungen: | Institut für Technische Thermodynamik > Elektrochemische Energietechnik | ||||||||||||||||
Hinterlegt von: | Hofmann, Andreas Felix | ||||||||||||||||
Hinterlegt am: | 12 Nov 2012 15:59 | ||||||||||||||||
Letzte Änderung: | 22 Jun 2023 10:33 |
Verfügbare Versionen dieses Eintrags
- Kinetic bottlenecks to chemical exchange rates for deep-sea animals – Part 1: Oxygen. (deposited 12 Nov 2012 15:59) [Gegenwärtig angezeigt]
Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags