Sustaining biological productivity over ocean subtropical gyres by time-varying eddies ...
<!--!introduction!--> The ocean's subtropical gyres account for about half of global ocean biological carbon fixation. Their productivity is limited by the rate of supply of essential nutrients to the sunlit surface water, which is continuously depleted by gravitational sinking of organic...
| Main Authors: | , , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
GFZ German Research Centre for Geosciences
2023
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.57757/iugg23-0972 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016505 |
| Summary: | <!--!introduction!--> The ocean's subtropical gyres account for about half of global ocean biological carbon fixation. Their productivity is limited by the rate of supply of essential nutrients to the sunlit surface water, which is continuously depleted by gravitational sinking of organic particles and large-scale, wind-driven downwelling. To address this conundrum of how productivity is sustained in subtropical gyres, we conduct two complementary studies: 1. We conducted a field campaign in in the North Atlantic subtropical gyre, consisting of transects over and off the mid-Atlantic ridge including measurements of turbulent kinetic energy dissipation and nitrate. Diapycnal mixing provides a nutrient supply within the euphotic zone, but a loss of nutrients within the upper thermocline. Eddy stirring augments, and is comparable to, the diapycnal transfer of nutrients within the summertime upper thermocline, while also acting to replenish nutrients within the deeper parts of the thermocline. 2. We ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
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