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Optical determinations of photophysiology along an ecological gradient in the North Pacific Ocean.

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Title: Optical determinations of photophysiology along an ecological gradient in the North Pacific Ocean.
Authors: Allen, James G.1,2 (AUTHOR) jgallen@hawaii.edu, Dugenne, Mathilde1,2 (AUTHOR), Letelier, Ricardo M.3 (AUTHOR), White, Angelicque E.1,2 (AUTHOR)
Source: Limnology & Oceanography. Mar2022, Vol. 67 Issue 3, p713-725. 13p.
Subjects: Fluorescence yield, Photosynthetically active radiation (PAR), Photosynthetic rates, Colloidal carbon, Chlorophyll spectra, Radiation measurements
Abstract: Photosynthesis acts as a fundamental control in the cycling of biologically reactive elements in the ocean. Modeling photosynthesis requires an understanding of its response to light, specifically the maximum rate of photosynthesis per photon absorbed and the irradiance level at which it becomes light‐saturated (Ek), though field measurements of these parameters are both time and labor intensive. As absorbed light either drives photosynthesis, is re‐emitted as fluorescence, or is converted to heat, fluorescence can be related to the photosynthetic response to light in that, as light increases, there exists an inflection point where the probability that excess absorbed energy is dissipated as heat increases and fluorescence yield is decreased. Accordingly, we use a combination of in vivo chlorophyll fluorescence, particulate matter absorption spectra, and photosynthetically active radiation measurements to approximate this inflection irradiance (termed EFT) and relate it to modeled Ek along a transect from the oligotrophic North Pacific Subtropical Gyre to the edge of the more eutrophic subpolar gyre (~ 45°N). We find that EFT declines by a factor of 4× from values of 200–300 μmol photons m−2 s−1 in the oligotrophic gyre to 50–100 μmol photons m−2 s−1 north of the transition zone and correlates well with Ek from traditional data and models. This latitudinal pattern is associated with changes in biomass concentrations and the phytoplankton carbon to chlorophyll ratio, as well as with changes in particulate carbon to nitrogen ratios. Collectively, these results demonstrate a promising framework to capture high‐resolution variability in a key photosynthetic parameter. [ABSTRACT FROM AUTHOR]
Copyright of Limnology & Oceanography 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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DbLabel: Engineering Source
An: 155835698
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PubTypeId: academicJournal
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  Data: Optical determinations of photophysiology along an ecological gradient in the North Pacific Ocean.
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  Data: <searchLink fieldCode="JN" term="%22Limnology+%26+Oceanography%22">Limnology & Oceanography</searchLink>. Mar2022, Vol. 67 Issue 3, p713-725. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Fluorescence+yield%22">Fluorescence yield</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthetically+active+radiation+%28PAR%29%22">Photosynthetically active radiation (PAR)</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthetic+rates%22">Photosynthetic rates</searchLink><br /><searchLink fieldCode="DE" term="%22Colloidal+carbon%22">Colloidal carbon</searchLink><br /><searchLink fieldCode="DE" term="%22Chlorophyll+spectra%22">Chlorophyll spectra</searchLink><br /><searchLink fieldCode="DE" term="%22Radiation+measurements%22">Radiation measurements</searchLink>
– Name: Abstract
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  Data: Photosynthesis acts as a fundamental control in the cycling of biologically reactive elements in the ocean. Modeling photosynthesis requires an understanding of its response to light, specifically the maximum rate of photosynthesis per photon absorbed and the irradiance level at which it becomes light‐saturated (Ek), though field measurements of these parameters are both time and labor intensive. As absorbed light either drives photosynthesis, is re‐emitted as fluorescence, or is converted to heat, fluorescence can be related to the photosynthetic response to light in that, as light increases, there exists an inflection point where the probability that excess absorbed energy is dissipated as heat increases and fluorescence yield is decreased. Accordingly, we use a combination of in vivo chlorophyll fluorescence, particulate matter absorption spectra, and photosynthetically active radiation measurements to approximate this inflection irradiance (termed EFT) and relate it to modeled Ek along a transect from the oligotrophic North Pacific Subtropical Gyre to the edge of the more eutrophic subpolar gyre (~ 45°N). We find that EFT declines by a factor of 4× from values of 200–300 μmol photons m−2 s−1 in the oligotrophic gyre to 50–100 μmol photons m−2 s−1 north of the transition zone and correlates well with Ek from traditional data and models. This latitudinal pattern is associated with changes in biomass concentrations and the phytoplankton carbon to chlorophyll ratio, as well as with changes in particulate carbon to nitrogen ratios. Collectively, these results demonstrate a promising framework to capture high‐resolution variability in a key photosynthetic parameter. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Limnology & Oceanography 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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RecordInfo BibRecord:
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        Value: 10.1002/lno.12031
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      – Code: eng
        Text: English
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        PageCount: 13
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      – SubjectFull: Fluorescence yield
        Type: general
      – SubjectFull: Photosynthetically active radiation (PAR)
        Type: general
      – SubjectFull: Photosynthetic rates
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      – SubjectFull: Colloidal carbon
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      – SubjectFull: Chlorophyll spectra
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      – SubjectFull: Radiation measurements
        Type: general
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      – TitleFull: Optical determinations of photophysiology along an ecological gradient in the North Pacific Ocean.
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            NameFull: Allen, James G.
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            NameFull: Dugenne, Mathilde
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            NameFull: Letelier, Ricardo M.
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            NameFull: White, Angelicque E.
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            – D: 01
              M: 03
              Text: Mar2022
              Type: published
              Y: 2022
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