Working towards an international consensus on criteria for assessing Internet Gaming Disorder: A critical commentary on Petry et al (2014)

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Despite slow nutrient supply to the subtropical surface ocean, the rates of annual inorganic carbon uptake and net oxygen production are similar to those of nutrient-rich high-latitude waters. This surprisingly high subtropical carbon uptake cannot be fully accounted for by sediment trap-collected sinking particles and the downward mixing of suspended and dissolved organic carbon. We propose an explanation for these paradoxical observations: gel-like organic matter rich in carbon but poor in nutrients, akin to transparent exopolymer particles, is produced by phytoplankton under nutrient limitation, and a portion sinks into the shallow subsurface, where it is respired by heterotrophic bacteria. This organic matter would evade detection by sediment traps, effectively representing an additional (sinking-driven) source of dissolved organic carbon to the subsurface. Building on existing evidence for the production of such nutrient-poor organic matter in surface waters, we describe evidence for its decomposition in the shallow subsurface of the Sargasso Sea. First, oxygen at these depths is consumed over the summer without comparable production of nitrate. Second, a seasonal change in the

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  • Queen Sirikit

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