Iron regulation of North Atlantic eddy phytoplankton productivity.
Browning, Thomas J. , Al-Hashem, Ali A., Hopwood, Mark J.
, Engel, Anja
, Belkin, Igor M., Wakefield, Ewan D., Fischer, Tim
and Achterberg, Eric P.
(2021)
Iron regulation of North Atlantic eddy phytoplankton productivity.
Geophysical Research Letters
.
e2020GL091403.
DOI 10.1029/2020GL091403.
![]() |
Text
2020GL091403.pdf - Accepted Version Available under License Creative Commons: Attribution 4.0. Download (10Mb) |
![]() |
Other (Text)
2020gl091403-sup-0001-text - Supplemental Material Available under License Creative Commons: Attribution 4.0. Download (12Mb) |
![]() |
Other (Data)
2020gl091403-sup-0002-data - Supplemental Material Available under License Creative Commons: Attribution 4.0. Download (4Kb) |
Abstract
Cyclonic ocean eddies drive upwelling of deep waters enhanced in nutrients, which can elevate phytoplankton productivity. At mid‐latitudes in the North Atlantic, satellite images show enhanced chlorophyll‐a associated with eddies. However, surface macronutrient concentrations are often not fully depleted in this region, implying enhanced macronutrient supply is not the primary control. We conducted high resolution sampling through two mid‐latitude Atlantic eddies in late spring, located 800 and 350 km east of the Newfoundland Grand Banks. Waters outside of both eddies had unused residual macronutrients, low dissolved iron, and iron‐stressed phytoplankton. Inside both eddies, plankton biomass was higher and macronutrient concentrations lower. However, full macronutrient drawdown and an absence of iron stress were only present in the eddy nearer the continental shelf. From these two examples, iron supply and proximity to shelf iron sources appear to be important factors regulating productivity and macronutrient utilization in mid‐latitude North Atlantic cyclonic eddies.
Document Type: | Article |
---|---|
Keywords: | Eddy, Upwelling, Primary productivity, Iron, Phytoplankton, North Atlantic |
Research affiliation: | OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography |
Main POF Topic: | PT6: Marine Life |
Refereed: | Yes |
Open Access Journal?: | No |
DOI etc.: | 10.1029/2020GL091403 |
ISSN: | 0094-8276 |
Related URLs: | |
Projects: | REEBUS |
Date Deposited: | 08 Feb 2021 14:07 |
Last Modified: | 08 Feb 2021 14:07 |
URI: | http://oceanrep.geomar.de/id/eprint/51752 |
Actions (login required)
![]() |
View Item |
Document Downloads
More statistics for this item...
Copyright 2013 | GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel | All rights reserved
Questions, comments and suggestions regarding the GEOMAR repository are welcomed
at bibliotheksleitung@geomar.de !