Simon A. Morley
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
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
Dr Cath Waller C.L.Waller@hull.ac.uk
Lecturer
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., Henley, S. F., Höfer, J., Hughes, K. A., Martin, S. M., Moffat, C., Raphael, M., Stammerjohn, S. E., Suckling, C. C., Tulloch, V. J., Waller, C. L., & 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, Article 547188. 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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