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Showing 1–7 of 7 results
Advanced filters: Author: Sandy J. Thomalla Clear advanced filters

  • Using 25 years of satellite chlorophyll a data, the authors demonstrate significant and widespread changes in the amplitude, timing, duration and seasonality of Southern Ocean phytoplankton blooms. Such changes threaten ecosystem services and can impact global climate by altering natural CO2 uptake.

    • Sandy J. Thomalla
    • Sarah-Anne Nicholson
    • Marié E. Smith
    ResearchOpen Access
    Nature Climate Change
    Volume: 13, P: 975-984

  • It is found that carbon export fluxes to the deep ocean from a highly productive, naturally iron-fertilized region of the sub-Antarctic Southern Ocean are two to three times larger than the carbon export fluxes from an adjacent high-nutrient low-chlorophyll area not fertilized by iron. These findings support the hypothesis that increased iron supply to the glacial sub-Antarctic may have directly enhanced carbon export to the deep ocean.

    • Raymond T. Pollard
    • Ian Salter
    • Mike V. Zubkov
    Research
    Nature
    Volume: 457, P: 577-580

  • This study reports a dense, late summer phytoplankton bloom in the Southern Ocean that accumulated unusually high levels of organic matter and supported feeding hot spots for birds and whales. The authors show that this recurring open ocean bloom is driven by anomalies in easterly winds that push sea ice southwards and favour the upwelling of deep waters enriched in hydrothermal iron.

    • Sebastien Moreau
    • Tore Hattermann
    • Harald Steen
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-12

  • Earth system models underestimate the decline in net primary productivity associated with ocean warming, meaning future net primary productivity decline is more likely than currently estimated, according to a ranking of Earth system models using remote sensing data.

    • Thomas J. Ryan-Keogh
    • Alessandro Tagliabue
    • Sandy J. Thomalla
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 6, P: 1-10

  • The Southern Ocean represents a substantial carbon sink and heavily influences global carbon fluxes. This Review describes how an expanding suite of observations are providing increasing insight into the contribution of biota and plankton to the carbon cycle in the Southern Ocean.

    • Philip W. Boyd
    • Kevin R. Arrigo
    • Sandy J. Thomalla
    Reviews
    Nature Reviews Earth & Environment
    Volume: 5, P: 390-408

  • The Southern Ocean carbon sink is projected to move poleward under a high emission scenario with increases in the Revelle Factor and carbon uptake that are biologically-driven in summertime and solubility-driven in wintertime linked to sea-ice melt, suggest CMIP6 Earth system model simulations.

    • Precious Mongwe
    • Luke Gregor
    • Pedro M. S. Monteiro
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 5, P: 1-13