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Does Satellite Chlorophyll‐a Respond to Southernmost Patagonian Dust? A Multi‐year, Event‐Based Approach.

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Title: Does Satellite Chlorophyll‐a Respond to Southernmost Patagonian Dust? A Multi‐year, Event‐Based Approach.
Authors: Cosentino, N. J.1,2,3,4, Ruiz‐Etcheverry, L. A.5,6,7, Bia, G. L.1,2, Simonella, L. E.8, Coppo, R.1,2, Torre, G.1,2, Saraceno, M.5,6,7, Tur, V. M.1,2, Gaiero, D. M.1,2 diego.gaiero@unc.edu.ar
Source: Journal of Geophysical Research. Biogeosciences. Dec2020, Vol. 125 Issue 12, p1-19. 19p.
Subject Terms: *Chlorophyll, *Dust, *Atmospheric aerosols, *Climatology, *Ocean, Continental shelf
Geographic Terms: Patagonia (Argentina & Chile), Atlantic Ocean
Abstract: Mineral aerosols may affect global climate indirectly by enhancing net primary productivity (NPP) upon deposition to the oceans and associated atmosphere‐to‐ocean CO2 flux. This mechanism is hypothesized to have contributed significantly to the last interglacial‐to‐glacial climatic transition. However, the dust‐NPP connection remains contentious for the present‐day climate system. We analyze the impact of southernmost Patagonian dust emissions on southwestern Atlantic Ocean continental shelf and proximal open ocean satellite chlorophyll‐a concentration. We use the first decadal time series of surface dust mass flux in southern Patagonia, along with in situ visibility data, to model dust emission, transport, and deposition to the ocean. We then perform a dust event‐based analysis of chlorophyll‐a time series, using a novel approach by which time series are corrected for post‐depositional particle advection due to ocean currents. Finally, we performed chemical analysis of iron in dust samples, a key micronutrient limiting phytoplankton biomass in high‐nutrient, low‐chlorophyll oceans such as offshore of the 200‐m isobath off Patagonia. We find no compelling evidence for an influence of dust as an enhancer of phytoplankton biomass either on shelf or proximal open ocean waters of the southwestern Atlantic Ocean. For open ocean waters this is consistent with a lack of source‐inherited bioavailable iron in dust samples. Future case studies addressing similar questions should concentrate on dust sources with identified high contents of bioavailable iron, particularly in the Southern Hemisphere where atmospheric processing of iron is weak. Key Points: We present the first decadal time series of surface dust mass flux in PatagoniaThe first event‐based study in the southwestern Atlantic Ocean shows no evidence for an influence of dust on chlorophyll‐a concentrationsSource‐inherited low concentrations of bioavailable iron preclude enhancement of primary producers' biomass in proximal open ocean waters [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Biogeosciences is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Does Satellite Chlorophyll‐a Respond to Southernmost Patagonian Dust? A Multi‐year, Event‐Based Approach.
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  Data: <searchLink fieldCode="AR" term="%22Cosentino%2C+N%2E+J%2E%22">Cosentino, N. J.</searchLink><relatesTo>1,2,3,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Ruiz‐Etcheverry%2C+L%2E+A%2E%22">Ruiz‐Etcheverry, L. A.</searchLink><relatesTo>5,6,7</relatesTo><br /><searchLink fieldCode="AR" term="%22Bia%2C+G%2E+L%2E%22">Bia, G. L.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Simonella%2C+L%2E+E%2E%22">Simonella, L. E.</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Coppo%2C+R%2E%22">Coppo, R.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Torre%2C+G%2E%22">Torre, G.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Saraceno%2C+M%2E%22">Saraceno, M.</searchLink><relatesTo>5,6,7</relatesTo><br /><searchLink fieldCode="AR" term="%22Tur%2C+V%2E+M%2E%22">Tur, V. M.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Gaiero%2C+D%2E+M%2E%22">Gaiero, D. M.</searchLink><relatesTo>1,2</relatesTo><i> diego.gaiero@unc.edu.ar</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Biogeosciences%22">Journal of Geophysical Research. Biogeosciences</searchLink>. Dec2020, Vol. 125 Issue 12, p1-19. 19p.
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  Data: *<searchLink fieldCode="DE" term="%22Chlorophyll%22">Chlorophyll</searchLink><br />*<searchLink fieldCode="DE" term="%22Dust%22">Dust</searchLink><br />*<searchLink fieldCode="DE" term="%22Atmospheric+aerosols%22">Atmospheric aerosols</searchLink><br />*<searchLink fieldCode="DE" term="%22Climatology%22">Climatology</searchLink><br />*<searchLink fieldCode="DE" term="%22Ocean%22">Ocean</searchLink><br /><searchLink fieldCode="DE" term="%22Continental+shelf%22">Continental shelf</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Patagonia+%28Argentina+%26+Chile%29%22">Patagonia (Argentina & Chile)</searchLink><br /><searchLink fieldCode="DE" term="%22Atlantic+Ocean%22">Atlantic Ocean</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Mineral aerosols may affect global climate indirectly by enhancing net primary productivity (NPP) upon deposition to the oceans and associated atmosphere‐to‐ocean CO2 flux. This mechanism is hypothesized to have contributed significantly to the last interglacial‐to‐glacial climatic transition. However, the dust‐NPP connection remains contentious for the present‐day climate system. We analyze the impact of southernmost Patagonian dust emissions on southwestern Atlantic Ocean continental shelf and proximal open ocean satellite chlorophyll‐a concentration. We use the first decadal time series of surface dust mass flux in southern Patagonia, along with in situ visibility data, to model dust emission, transport, and deposition to the ocean. We then perform a dust event‐based analysis of chlorophyll‐a time series, using a novel approach by which time series are corrected for post‐depositional particle advection due to ocean currents. Finally, we performed chemical analysis of iron in dust samples, a key micronutrient limiting phytoplankton biomass in high‐nutrient, low‐chlorophyll oceans such as offshore of the 200‐m isobath off Patagonia. We find no compelling evidence for an influence of dust as an enhancer of phytoplankton biomass either on shelf or proximal open ocean waters of the southwestern Atlantic Ocean. For open ocean waters this is consistent with a lack of source‐inherited bioavailable iron in dust samples. Future case studies addressing similar questions should concentrate on dust sources with identified high contents of bioavailable iron, particularly in the Southern Hemisphere where atmospheric processing of iron is weak. Key Points: We present the first decadal time series of surface dust mass flux in PatagoniaThe first event‐based study in the southwestern Atlantic Ocean shows no evidence for an influence of dust on chlorophyll‐a concentrationsSource‐inherited low concentrations of bioavailable iron preclude enhancement of primary producers' biomass in proximal open ocean waters [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Biogeosciences is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1029/2020JG006073
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 19
        StartPage: 1
    Subjects:
      – SubjectFull: Chlorophyll
        Type: general
      – SubjectFull: Dust
        Type: general
      – SubjectFull: Atmospheric aerosols
        Type: general
      – SubjectFull: Climatology
        Type: general
      – SubjectFull: Ocean
        Type: general
      – SubjectFull: Continental shelf
        Type: general
      – SubjectFull: Patagonia (Argentina & Chile)
        Type: general
      – SubjectFull: Atlantic Ocean
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      – TitleFull: Does Satellite Chlorophyll‐a Respond to Southernmost Patagonian Dust? A Multi‐year, Event‐Based Approach.
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              Text: Dec2020
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