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1. Arctic Ocean Primary Productivity.

   Frey, K.E (October 2017, In: Arctic Report Card 2017, NOAA, http://www.arctic.noaa.gov/Report-Card/Report-Card-2017/ArtMID/7798/ArticleID/701/Arctic-Ocean-Primary-Productivity)
2. The Diel Cycle of Surface Ocean Elemental Stoichiometry has Implications for Ocean Productivity

   https://doi.org/10.1029/2021GB007092  

   Garcia, Nathan S.; Talmy, David; Fu, Wei‐Wei; Larkin, Alyse A.; Lee, Jenna; Martiny, Adam C. (March 2022, Global Biogeochemical Cycles)

   Abstract Environmentally driven variability in the elemental stoichiometry of ocean plankton plays a key role in ocean biogeochemical processes. Recent studies have identified clear regional variability in C:N:P, but less is known about the environmental regulation of diel variability in plankton elemental stoichiometry. Here, we quantified the amplitude of the diel variability in C:N of surface ocean particles (<30 μm,C:N_amp) across large latitudinal gradients in the Indian and Atlantic Oceans. We commonly observed diel oscillations in C:N and biome‐specific variability inC:N_amp. Temperature emerged as the strongest predictor ofC:N_amp, relative to the supply of nitrate. We propose thatC:N_ampis positively related to photosynthesis and respiration and thus phytoplankton growth rates. We find that independent growth rate proxies and an ecosystem model support this hypothesis. In addition, the temperature sensitivity ofC:N_amphas aQ₁₀of 1.78 corroborating studies of phytoplankton growth rates. Surface communities across the Indian Ocean transect had a very small dependency on nitrate, whereas recycled nitrogen sources were by far the most preferred and the ratio of recycled‐N:nitrate utilization increased with increasingC:N_amp. To predict future changes inC:N_amp, we combined our statistical model with data from the fifth Coupled Model Intercomparison Project for the years 1990 and 2090. The results suggest that future rising temperatures will yield increasedC:N_amp. Collectively, our results imply that rising surface ocean temperatures lead to elevated phytoplankton growth rates supported by recycled nutrients. 

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3. Ocean carbon from space: Current status and priorities for the next decade

   https://doi.org/10.1016/j.earscirev.2023.104386  

   Brewin, Robert J.W.; Sathyendranath, Shubha; Kulk, Gemma; Rio, Marie-Hélène; Concha, Javier A.; Bell, Thomas G.; Bracher, Astrid; Fichot, Cédric; Frölicher, Thomas L.; Galí, Martí; et al (May 2023, Earth-Science Reviews)
4. Strong glacial-interglacial variability in upper ocean hydrodynamics, biogeochemistry, and productivity in the southern Indian Ocean

   https://doi.org/10.1038/s43247-021-00148-0  

   Tangunan, Deborah; Berke, Melissa A.; Cartagena-Sierra, Alejandra; Flores, José Abel; Gruetzner, Jens; Jiménez-Espejo, Francisco; LeVay, Leah J.; Baumann, Karl-Heinz; Romero, Oscar; Saavedra-Pellitero, Mariem; et al (December 2021, Communications Earth & Environment)

   null (Ed.)

   Abstract In the southern Indian Ocean, the position of the subtropical front – the boundary between colder, fresher waters to the south and warmer, saltier waters to the north – has a strong influence on the upper ocean hydrodynamics and biogeochemistry. Here we analyse a sedimentary record from the Agulhas Plateau, located close to the modern position of the subtropical front and use alkenones and coccolith assemblages to reconstruct oceanographic conditions over the past 300,000 years. We identify a strong glacial-interglacial variability in sea surface temperature and productivity associated with subtropical front migration over the Agulhas Plateau, as well as shorter-term high frequency variability aligned with variations in high latitude insolation. Alkenone and coccolith abundances, in combination with diatom and organic carbon records indicate high glacial export productivity. We conclude that the biological pump was more efficient and strengthened during glacial periods, which could partly account for the reported reduction in atmospheric carbon dioxide concentrations. 

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5. Productivity and Change in Fish and Squid in the Southern Ocean

   https://doi.org/10.3389/fevo.2021.624918  

   Caccavo, Jilda Alicia; Christiansen, Henrik; Constable, Andrew J.; Ghigliotti, Laura; Trebilco, Rowan; Brooks, Cassandra M.; Cotte, Cédric; Desvignes, Thomas; Dornan, Tracey; Jones, Christopher D.; et al (June 2021, Frontiers in Ecology and Evolution)

   Southern Ocean ecosystems are globally important and vulnerable to global drivers of change, yet they remain challenging to study. Fish and squid make up a significant portion of the biomass within the Southern Ocean, filling key roles in food webs from forage to mid-trophic species and top predators. They comprise a diverse array of species uniquely adapted to the extreme habitats of the region. Adaptations such as antifreeze glycoproteins, lipid-retention, extended larval phases, delayed senescence, and energy-conserving life strategies equip Antarctic fish and squid to withstand the dark winters and yearlong subzero temperatures experienced in much of the Southern Ocean. In addition to krill exploitation, the comparatively high commercial value of Antarctic fish, particularly the lucrative toothfish, drives fisheries interests, which has included illegal fishing. Uncertainty about the population dynamics of target species and ecosystem structure and function more broadly has necessitated a precautionary, ecosystem approach to managing these stocks and enabling the recovery of depleted species. Fisheries currently remain the major local driver of change in Southern Ocean fish productivity, but global climate change presents an even greater challenge to assessing future changes. Parts of the Southern Ocean are experiencing ocean-warming, such as the West Antarctic Peninsula, while other areas, such as the Ross Sea shelf, have undergone cooling in recent years. These trends are expected to result in a redistribution of species based on their tolerances to different temperature regimes. Climate variability may impair the migratory response of these species to environmental change, while imposing increased pressures on recruitment. Fisheries and climate change, coupled with related local and global drivers such as pollution and sea ice change, have the potential to produce synergistic impacts that compound the risks to Antarctic fish and squid species. The uncertainty surrounding how different species will respond to these challenges, given their varying life histories, environmental dependencies, and resiliencies, necessitates regular assessment to inform conservation and management decisions. Urgent attention is needed to determine whether the current management strategies are suitably precautionary to achieve conservation objectives in light of the impending changes to the ecosystem. 

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