Industrial-era decline in subarctic Atlantic productivity

Matthew B. Osman, Sarah B. Das, Luke Trusel, Matthew J. Evans, Hubertus Fischer, Mackenzie M. Grieman, Sepp Kipfstuhl, Joseph R. McConnell, Eric S. Saltzman

Research output: Contribution to journalLetter

3 Citations (Scopus)

Abstract

Marine phytoplankton have a crucial role in the modulation of marine-based food webs1, fishery yields2 and the global drawdown of atmospheric carbon dioxide3. However, owing to sparse measurements before satellite monitoring in the twenty-first century, the long-term response of planktonic stocks to climate forcing is unknown. Here, using a continuous, multi-century record of subarctic Atlantic marine productivity, we show that a marked 10 ± 7% decline in net primary productivity has occurred across this highly productive ocean basin over the past two centuries. We support this conclusion by the application of a marine-productivity proxy, established using the signal of the planktonic-derived aerosol methanesulfonic acid, which is commonly identified across an array of Greenlandic ice cores. Using contemporaneous satellite-era observations, we demonstrate the use of this signal as a robust and high-resolution proxy for past variations in spatially integrated marine productivity. We show that the initiation of declining subarctic Atlantic productivity broadly coincides with the onset of Arctic surface warming4, and that productivity strongly covaries with regional sea-surface temperatures and basin-wide gyre circulation strength over recent decades. Taken together, our results suggest that the decline in industrial-era productivity may be evidence of the predicted5 collapse of northern Atlantic planktonic stocks in response to a weakened Atlantic Meridional Overturning Circulation6–8. Continued weakening of this Atlantic Meridional Overturning Circulation, as projected for the twenty-first century9,10, may therefore result in further productivity declines across this globally relevant region.

Original languageEnglish (US)
Pages (from-to)551-555
Number of pages5
JournalNature
Volume569
Issue number7757
DOIs
StatePublished - May 23 2019

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productivity
climate forcing
meridional circulation
twenty first century
ocean basin
gyre
drawdown
ice core
sea surface temperature
fishery
phytoplankton
aerosol
food
acid
carbon
monitoring
basin

All Science Journal Classification (ASJC) codes

  • General

Cite this

Osman, M. B., Das, S. B., Trusel, L., Evans, M. J., Fischer, H., Grieman, M. M., ... Saltzman, E. S. (2019). Industrial-era decline in subarctic Atlantic productivity. Nature, 569(7757), 551-555. https://doi.org/10.1038/s41586-019-1181-8
Osman, Matthew B. ; Das, Sarah B. ; Trusel, Luke ; Evans, Matthew J. ; Fischer, Hubertus ; Grieman, Mackenzie M. ; Kipfstuhl, Sepp ; McConnell, Joseph R. ; Saltzman, Eric S. / Industrial-era decline in subarctic Atlantic productivity. In: Nature. 2019 ; Vol. 569, No. 7757. pp. 551-555.
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Osman, MB, Das, SB, Trusel, L, Evans, MJ, Fischer, H, Grieman, MM, Kipfstuhl, S, McConnell, JR & Saltzman, ES 2019, 'Industrial-era decline in subarctic Atlantic productivity', Nature, vol. 569, no. 7757, pp. 551-555. https://doi.org/10.1038/s41586-019-1181-8

Industrial-era decline in subarctic Atlantic productivity. / Osman, Matthew B.; Das, Sarah B.; Trusel, Luke; Evans, Matthew J.; Fischer, Hubertus; Grieman, Mackenzie M.; Kipfstuhl, Sepp; McConnell, Joseph R.; Saltzman, Eric S.

In: Nature, Vol. 569, No. 7757, 23.05.2019, p. 551-555.

Research output: Contribution to journalLetter

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AU - Osman, Matthew B.

AU - Das, Sarah B.

AU - Trusel, Luke

AU - Evans, Matthew J.

AU - Fischer, Hubertus

AU - Grieman, Mackenzie M.

AU - Kipfstuhl, Sepp

AU - McConnell, Joseph R.

AU - Saltzman, Eric S.

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N2 - Marine phytoplankton have a crucial role in the modulation of marine-based food webs1, fishery yields2 and the global drawdown of atmospheric carbon dioxide3. However, owing to sparse measurements before satellite monitoring in the twenty-first century, the long-term response of planktonic stocks to climate forcing is unknown. Here, using a continuous, multi-century record of subarctic Atlantic marine productivity, we show that a marked 10 ± 7% decline in net primary productivity has occurred across this highly productive ocean basin over the past two centuries. We support this conclusion by the application of a marine-productivity proxy, established using the signal of the planktonic-derived aerosol methanesulfonic acid, which is commonly identified across an array of Greenlandic ice cores. Using contemporaneous satellite-era observations, we demonstrate the use of this signal as a robust and high-resolution proxy for past variations in spatially integrated marine productivity. We show that the initiation of declining subarctic Atlantic productivity broadly coincides with the onset of Arctic surface warming4, and that productivity strongly covaries with regional sea-surface temperatures and basin-wide gyre circulation strength over recent decades. Taken together, our results suggest that the decline in industrial-era productivity may be evidence of the predicted5 collapse of northern Atlantic planktonic stocks in response to a weakened Atlantic Meridional Overturning Circulation6–8. Continued weakening of this Atlantic Meridional Overturning Circulation, as projected for the twenty-first century9,10, may therefore result in further productivity declines across this globally relevant region.

AB - Marine phytoplankton have a crucial role in the modulation of marine-based food webs1, fishery yields2 and the global drawdown of atmospheric carbon dioxide3. However, owing to sparse measurements before satellite monitoring in the twenty-first century, the long-term response of planktonic stocks to climate forcing is unknown. Here, using a continuous, multi-century record of subarctic Atlantic marine productivity, we show that a marked 10 ± 7% decline in net primary productivity has occurred across this highly productive ocean basin over the past two centuries. We support this conclusion by the application of a marine-productivity proxy, established using the signal of the planktonic-derived aerosol methanesulfonic acid, which is commonly identified across an array of Greenlandic ice cores. Using contemporaneous satellite-era observations, we demonstrate the use of this signal as a robust and high-resolution proxy for past variations in spatially integrated marine productivity. We show that the initiation of declining subarctic Atlantic productivity broadly coincides with the onset of Arctic surface warming4, and that productivity strongly covaries with regional sea-surface temperatures and basin-wide gyre circulation strength over recent decades. Taken together, our results suggest that the decline in industrial-era productivity may be evidence of the predicted5 collapse of northern Atlantic planktonic stocks in response to a weakened Atlantic Meridional Overturning Circulation6–8. Continued weakening of this Atlantic Meridional Overturning Circulation, as projected for the twenty-first century9,10, may therefore result in further productivity declines across this globally relevant region.

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Osman MB, Das SB, Trusel L, Evans MJ, Fischer H, Grieman MM et al. Industrial-era decline in subarctic Atlantic productivity. Nature. 2019 May 23;569(7757):551-555. https://doi.org/10.1038/s41586-019-1181-8