Title

Role of carbonate burial in Blue Carbon budgets

Authors

V Saderne, King Abdullah University of Science and Technology, Saudi Arabia
N R. Geraldi, King Abdullah University of Science and Technology, Saudi Arabia
P I. Macreadie, Deakin University, Australia
Damien T. Maher, Southern Cross University, AustraliaFollow
J J. Middelburg, Utrecht University, The Netherlands
O Serrano, Edith Cowan University, Australia
H Almahasheer, Imam Abdulrahman Bin Faisal University, Saudi Arabia
A Arias-Ortiz, Universitat Autònoma de Barcelona, Spain
M Cusack, King Abdullah University of Science and Technology, Saudi Arabia
Bradley D. Eyre, Southern Cross University, AustraliaFollow
J W. Fourqurean, Florida International University, USA
H Kennedy, Bangor University, UK
D Krause-Jensen, Aarhus University, Denmark
T Kuwae, Port and Airport Research Institute, Japan
P S. Lavery, Edith Cowan University, Australia
C E. Lovelock, University of Queensland, Australia
N Marba, Institut Mediterrani d’Estudis Avançats, Spain
P Masqué, Edith Cowan University, Australia
M A. Mateo, Edith Cowan University, Australia
I Mazarrasa, Universidad de Cantabria, Spain
K J. McGlathery, University of Virginia, USA
M PJ Oreska, University of Virginia, USA
Christian J. Sanders, Southern Cross University, AustraliaFollow
Isaac R. Santos, Southern Cross University, AustraliaFollow
J M. Smoak, University of South Florida, USA
T Tanaya, Port and Airport Research Institute, Japan
K Watanabe, Port and Airport Research Institute, Japan
C M. Duarte, King Abdullah University of Science and Technology, Saudi Arabia

Document Type

Article

Publication details

Saderne, V, Geraldi, NR, Macreadie, PI, Maher, DT, Middelburg, JJ, Serrano, O, Almahasheer, H, Arias-Ortiz, A, Cusack, M, Eyre, BD, Fourqurean, JW, Kennedy, H, Krause-Jensen, D, Kuwae, T, Lavery, PS, Lovelock, CE, Marba, N, Masqué, P, Mateo, MA, Mazarrasa, I, McGlathery, KJ, Oreska, MPJ, sanders, CJ, Santos, IR, Smoak, JM, Tanaya, T, Watanabe, K & Duarte, CM 2019, 'Role of carbonate burial in Blue Carbon budgets', Nature Communications, vol. 10. no. 1.

Article available on Open Access

Peer Reviewed

Peer-Reviewed

Abstract

Calcium carbonates (CaCO3) often accumulate in mangrove and seagrass sediments. As CaCO3 production emits CO2, there is concern that this may partially offset the role of Blue Carbon ecosystems as CO2sinks through the burial of organic carbon (Corg). A global collection of data on inorganic carbon burial rates (Cinorg, 12% of CaCO3 mass) revealed global rates of 0.8 TgCinorg yr−1 and 15–62 TgCinorg yr−1 in mangrove and seagrass ecosystems, respectively. In seagrass, CaCO3burial may correspond to an offset of 30% of the net CO2 sequestration. However, a mass balance assessment highlights that the Cinorg burial is mainly supported by inputs from adjacent ecosystems rather than by local calcification, and that Blue Carbon ecosystems are sites of net CaCO3 dissolution. Hence, CaCO3 burial in Blue Carbon ecosystems contribute to seabed elevation and therefore buffers sea-level rise, without undermining their role as CO2 sinks.

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