Climate-driven oscillation of phosphorus and iron limitation in the North Pacific Subtropical Gyre
Abstract
The supply of nutrients is a fundamental regulator of ocean productivity and carbon sequestration. Nutrient sources, sinks, residence times, and elemental ratios vary over broad scales, including those resulting from climate-driven changes in upper water column stratification, advection, and the deposition of atmospheric dust. These changes can alter the proximate elemental control of ecosystem productivity with cascading ecological effects and impacts on carbon sequestration. Here, we report multidecadal observations revealing that the ecosystem in the eastern region of the North Pacific Subtropical Gyre (NPSG) oscillates on subdecadal scales between inorganic phosphorus (P i ) sufficiency and limitation, when P i concentration in surface waters decreases below 50–60 nmol⋅kg −1 . In situ observations and model simulations suggest that sea-level pressure changes over the northwest Pacific may induce basin-scale variations in the atmospheric transport and deposition of Asian dust-associated iron (Fe), causing the eastern portion of the NPSG ecosystem to shift between states of Fe and P i limitation. Our results highlight the critical need to include both atmospheric and ocean circulation variability when modeling the response of open ocean pelagic ecosystems under future climate change scenarios.
- Publication Date:
- Research Org.:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Org.:
- Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; National Science Foundation (NSF); Japan Agency for Marine-Earth Science and Technology (JAMSTEC); International Pacific Research Center (IPRC)
- OSTI Identifier:
- 1525531
- Alternate Identifier(s):
- OSTI ID: 1594091
- Grant/Contract Number:
- SC0006791; SC0006735; OCE-1260164; OCE-1357015; AGS-1049033
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 116 Journal Issue: 26; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; pelagic ecosystem; phosphorus limitation; atmospheric iron deposition; Pacific Decadal Oscillation; climate
Citation Formats
Letelier, Ricardo M., Björkman, Karin M., Church, Matthew J., Hamilton, Douglas S., Mahowald, Natalie M., Scanza, Rachel A., Schneider, Niklas, White, Angelicque E., and Karl, David M. Climate-driven oscillation of phosphorus and iron limitation in the North Pacific Subtropical Gyre. United States: N. p., 2019.
Web. doi:10.1073/pnas.1900789116.
Letelier, Ricardo M., Björkman, Karin M., Church, Matthew J., Hamilton, Douglas S., Mahowald, Natalie M., Scanza, Rachel A., Schneider, Niklas, White, Angelicque E., & Karl, David M. Climate-driven oscillation of phosphorus and iron limitation in the North Pacific Subtropical Gyre. United States. https://doi.org/10.1073/pnas.1900789116
Letelier, Ricardo M., Björkman, Karin M., Church, Matthew J., Hamilton, Douglas S., Mahowald, Natalie M., Scanza, Rachel A., Schneider, Niklas, White, Angelicque E., and Karl, David M. Mon .
"Climate-driven oscillation of phosphorus and iron limitation in the North Pacific Subtropical Gyre". United States. https://doi.org/10.1073/pnas.1900789116.
@article{osti_1525531,
title = {Climate-driven oscillation of phosphorus and iron limitation in the North Pacific Subtropical Gyre},
author = {Letelier, Ricardo M. and Björkman, Karin M. and Church, Matthew J. and Hamilton, Douglas S. and Mahowald, Natalie M. and Scanza, Rachel A. and Schneider, Niklas and White, Angelicque E. and Karl, David M.},
abstractNote = {The supply of nutrients is a fundamental regulator of ocean productivity and carbon sequestration. Nutrient sources, sinks, residence times, and elemental ratios vary over broad scales, including those resulting from climate-driven changes in upper water column stratification, advection, and the deposition of atmospheric dust. These changes can alter the proximate elemental control of ecosystem productivity with cascading ecological effects and impacts on carbon sequestration. Here, we report multidecadal observations revealing that the ecosystem in the eastern region of the North Pacific Subtropical Gyre (NPSG) oscillates on subdecadal scales between inorganic phosphorus (P i ) sufficiency and limitation, when P i concentration in surface waters decreases below 50–60 nmol⋅kg −1 . In situ observations and model simulations suggest that sea-level pressure changes over the northwest Pacific may induce basin-scale variations in the atmospheric transport and deposition of Asian dust-associated iron (Fe), causing the eastern portion of the NPSG ecosystem to shift between states of Fe and P i limitation. Our results highlight the critical need to include both atmospheric and ocean circulation variability when modeling the response of open ocean pelagic ecosystems under future climate change scenarios.},
doi = {10.1073/pnas.1900789116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 26,
volume = 116,
place = {United States},
year = {2019},
month = {6}
}
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https://doi.org/10.1073/pnas.1900789116
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