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Global Drivers on Southern Ocean Ecosystems: Changing Physical Environments and Anthropogenic Pressures in an Earth System

Morley, Simon A.; Abele, Doris; Barnes, David K.A.; Cárdenas, César A.; Cotté, Cedric; Gutt, Julian; Henley, Sian F.; Höfer, Juan; Hughes, Kevin A.; Martin, Stephanie M.; Moffat, Carlos; Raphael, Marilyn; Stammerjohn, Sharon E.; Suckling, Coleen C.; Tulloch, Vivitskaia J.D.; Waller, Cath L.; Constable, Andrew J.

Authors

Simon A. Morley

Doris Abele

David K.A. Barnes

César A. Cárdenas

Cedric Cotté

Julian Gutt

Sian F. Henley

Juan Höfer

Kevin A. Hughes

Stephanie M. Martin

Carlos Moffat

Marilyn Raphael

Sharon E. Stammerjohn

Coleen C. Suckling

Vivitskaia J.D. Tulloch

Andrew J. Constable



Abstract

Copyright © 2020 Morley, Abele, Barnes, Cárdenas, Cotté, Gutt, Henley, Höfer, Hughes, Martin, Moffat, Raphael, Stammerjohn, Suckling, Tulloch, Waller and Constable. The manuscript assesses the current and expected future global drivers of Southern Ocean (SO) ecosystems. Atmospheric ozone depletion over the Antarctic since the 1970s, has been a key driver, resulting in springtime cooling of the stratosphere and intensification of the polar vortex, increasing the frequency of positive phases of the Southern Annular Mode (SAM). This increases warm air-flow over the East Pacific sector (Western Antarctic Peninsula) and cold air flow over the West Pacific sector. SAM as well as El Niño Southern Oscillation events also affect the Amundsen Sea Low leading to either positive or negative sea ice anomalies in the west and east Pacific sectors, respectively. The strengthening of westerly winds is also linked to shoaling of deep warmer water onto the continental shelves, particularly in the East Pacific and Atlantic sectors. Air and ocean warming has led to changes in the cryosphere, with glacial and ice sheet melting in both sectors, opening up new ice free areas to biological productivity, but increasing seafloor disturbance by icebergs. The increased melting is correlated with a salinity decrease particularly in the surface 100 m. Such processes could increase the availability of iron, which is currently limiting primary production over much of the SO. Increasing CO2 is one of the most important SO anthropogenic drivers and is likely to affect marine ecosystems in the coming decades. While levels of many pollutants are lower than elsewhere, persistent organic pollutants (POPs) and plastics have been detected in the SO, with concentrations likely enhanced by migratory species. With increased marine traffic and weakening of ocean barriers the risk of the establishment of non-indigenous species is increased. The continued recovery of the ozone hole creates uncertainty over the reversal in sea ice trends, especially in the light of the abrupt transition from record high to record low Antarctic sea ice extent since spring 2016. The current rate of change in physical and anthropogenic drivers is certain to impact the Marine Ecosystem Assessment of the Southern Ocean (MEASO) region in the near future and will have a wide range of impacts across the marine ecosystem.

Citation

Morley, S. A., Abele, D., Barnes, D. K., Cárdenas, C. A., Cotté, C., Gutt, J., …Constable, A. J. (2020). Global Drivers on Southern Ocean Ecosystems: Changing Physical Environments and Anthropogenic Pressures in an Earth System. Frontiers in Marine Science, 7, https://doi.org/10.3389/fmars.2020.547188

Journal Article Type Review
Acceptance Date Nov 23, 2020
Online Publication Date Dec 15, 2020
Publication Date Dec 15, 2020
Deposit Date Jan 13, 2021
Publicly Available Date Jan 14, 2021
Journal Frontiers in Marine Science
Electronic ISSN 2296-7745
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 7
Article Number 547188
DOI https://doi.org/10.3389/fmars.2020.547188
Keywords Southern Annular Mode; Ozone hole; Cryosphere and climate change; Biogeochemsitry; Carbon dioxde; Non-indigenous species; Warming; Freshening
Public URL https://hull-repository.worktribe.com/output/3689131
Publisher URL https://www.frontiersin.org/articles/10.3389/fmars.2020.547188/full

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Copyright Statement
Copyright © 2020 Morley, Abele, Barnes, Cárdenas, Cotté, Gutt, Henley, Höfer, Hughes, Martin, Moffat, Raphael, Stammerjohn, Suckling, Tulloch, Waller and Constable. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.





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