La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Blue carbon in human-dominated estuarine and shallow coastal systems
Auteurs :	Tomohiro Kuwae, Auteur ; Jota Kanda, Auteur ; Atsushi Kubo, Auteur ; Fumiyuki Nakajima, Auteur ; Hiroshi Ogawa, Auteur ; Akio Sohma, Auteur ; Masahiro Suzumura, Auteur
Type de document :	Article
Dans :	AMBIO (45(3) APR 2016)
Article en page(s) :	290-301
Langues:	Anglais
Résumé :	Estuarine and shallow coastal systems (ESCS) are recognized as not only significant organic carbon reservoirs but also emitters of CO2 to the atmosphere through air-sea CO2 gas exchange, thus posing a dilemma on ESCS's role in climate change mitigation measures. However, some studies have shown that coastal waters take up atmospheric CO2 (C-atm), although the magnitude and determinants remain unclear. We argue that the phenomenon of net uptake of C-atm by ESCS is not unusual under a given set of terrestrial inputs and geophysical conditions. We assessed the key properties of systems that show the net C-atm uptake and found that they are often characteristic of human-dominated systems: (1) input of high terrestrial nutrients, (2) input of treated wastewater in which labile carbon is highly removed, and (3) presence of hypoxia. We propose that human-dominated ESCS are worthy of investigation as a contributor to climate change mitigation.

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