Large Stimulation of Recalcitrant Dissolved Organic Carbon Degradation by Increasing Ocean Temperatures

Frontiers in Marine Science

Christian Lønborg¹  Dennis A. Hansell²  Robert T. Letscher³  Xosé A. Álvarez–Salgado⁴ 

[1] Australian Institute of Marine Science, Townsville, QLD, Australia;Department of Ocean Sciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States;Earth System Science, University of California, Irvine, Irvine, CA, United States;IIM–CSIC, Instituto de Investigacións Mariñas, Vigo, Spain;

关键词: temperature;    dissolved organic carbon;    mineralization;    Arrhenius law;    global ocean biogeochemical model;   

DOI  :  10.3389/fmars.2017.00436

来源: DOAJ

【 摘 要 】

More than 96% of organic carbon in the ocean is in the dissolved form, most of it with lifetimes of decades to millennia. Yet, we know very little about the temperature sensitivity of dissolved organic carbon (DOC) degradation in a warming ocean. Combining independent estimates from laboratory experiments, oceanographic cruises and a global ocean DOC cycling model, we assess the relationship between DOC decay constants and seawater temperatures. Our results show that the apparent activation energy of DOC decay (Ea) increases by three-fold from the labile (lifetime of days) and semi-labile (lifetime of months) to the semi-refractory (lifetime of decades) DOC pools, with only minor differences between the world's largest ocean basins. This translates into increasing temperature coefficients (Q10) from 1.7–1.8 to 4–8, showing that the generalized assumption of a constant Q10 of ~2 for biological rates is not universally applicable for the microbial degradation of DOC in the ocean. Therefore, rising ocean temperatures will preferentially impact the microbial degradation of the more recalcitrant and larger of the three studied pools. Assuming a uniform 1°C warming scenario throughout the ocean, our model predicts a global decrease of the DOC reservoir by 7 ± 1 Pg C. This represents a 15% reduction of the semi-labile + semi-refractory DOC pools.

【 授权许可】

Unknown