A compilation of surface inherent optical properties and phytoplankton pigment concentrations from the Atlantic Meridional Transect
<p>In situ measurements of particulate inherent optical properties (IOPs) – absorption (<span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span>), scattering (<span class="inline-formula"><i>b</i>&l...
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Copernicus Publications
2025-02-01
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| Series: | Earth System Science Data |
| Online Access: | https://essd.copernicus.org/articles/17/493/2025/essd-17-493-2025.pdf |
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| author | T. M. Jordan G. Dall'Olmo G. Tilstone R. J. W. Brewin F. Nencioli R. Airs C. S. Thomas L. Schlüter |
| author_facet | T. M. Jordan G. Dall'Olmo G. Tilstone R. J. W. Brewin F. Nencioli R. Airs C. S. Thomas L. Schlüter |
| author_sort | T. M. Jordan |
| collection | DOAJ |
| description | <p>In situ measurements of particulate inherent optical properties (IOPs) – absorption (<span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span>), scattering (<span class="inline-formula"><i>b</i><sub>p</sub>(<i>λ</i>)</span>), and beam attenuation (<span class="inline-formula"><i>c</i><sub>p</sub>(<i>λ</i>)</span>) – are crucial for the development of optical algorithms that retrieve biogeochemical quantities such as chlorophyll <span class="inline-formula"><i>a</i></span>, particulate organic carbon (POC), and total suspended matter (TSM). Here we present a compilation of particulate absorption–attenuation spectrophotometric data measured underway on nine Atlantic Meridional Transect (AMT) cruises between 50° N and 50° S from 2009–2019. The compilation includes coincident high-performance liquid chromatography (HPLC) phytoplankton pigment concentrations, which are used to calibrate transects of total chlorophyll <span class="inline-formula"><i>a</i></span> (Tot_Chl_a) concentrations derived from the <span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span> line-height method. The IOP data are processed using a consistent methodology and include propagated uncertainties for each IOP variable, uncertainty quantification for the Tot_Chl_a concentrations based on HPLC match-ups, application of consistent quality-control filters, and standardization of output data fields and formats. The total IOP dataset consists of <span class="inline-formula">∼310 000</span> measurements at a 1 min binning (<span class="inline-formula">∼270 000</span> hyper-spectral) and <span class="inline-formula">>700</span> coincident HPLC pigment surface samples (<span class="inline-formula">∼600</span> of which are coincident with hyper-spectral IOPs). We present the geographic variation in the IOPs, HPLC phytoplankton pigments, and <span class="inline-formula"><i>a</i><sub>p</sub></span>-derived Tot_Chl_a concentrations which are shown to have uncertainties between 8 % and 20 %. Additionally, to stimulate further investigation of accessory pigment extraction from <span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span>, we quantify pigment correlation matrices and identify spectral characteristics of end-member <span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span> spectra, where accessory pigment groupings are present in higher concentrations relative to Tot_Chl_a. All data are made publicly available in SeaBASS and NetCDF formats via the following links: <span class="uri">https://seabass.gsfc.nasa.gov/archive/PML/AMT</span> <span class="cit" id="xref_paren.1">(<a href="#bib1.bibx37">Jordan et al.</a>, <a href="#bib1.bibx37">2025</a><a href="#bib1.bibx37">a</a>)</span> and <a href="https://doi.org/10.5281/zenodo.12527954">https://doi.org/10.5281/zenodo.12527954</a> <span class="cit" id="xref_paren.2">(<a href="#bib1.bibx35">Jordan et al.</a>, <a href="#bib1.bibx35">2024</a>)</span>.</p> |
| format | Article |
| id | doaj-art-17c46254399643d8bc059e52f6435b6f |
| institution | Kabale University |
| issn | 1866-3508 1866-3516 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Earth System Science Data |
| spelling | doaj-art-17c46254399643d8bc059e52f6435b6f2025-02-06T07:15:11ZengCopernicus PublicationsEarth System Science Data1866-35081866-35162025-02-011749351610.5194/essd-17-493-2025A compilation of surface inherent optical properties and phytoplankton pigment concentrations from the Atlantic Meridional TransectT. M. Jordan0G. Dall'Olmo1G. Tilstone2R. J. W. Brewin3F. Nencioli4R. Airs5C. S. Thomas6L. Schlüter7Plymouth Marine Laboratory, Plymouth, UKIstituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, ItalyPlymouth Marine Laboratory, Plymouth, UKCentre for Geography and Environmental Science, University of Exeter, Penryn, UKCollecte Localisation Satellites, Toulouse, FrancePlymouth Marine Laboratory, Plymouth, UKNASA Goddard Space Flight Center, Greenbelt, USADHI – Water and Environment, Hørsholm, Denmark<p>In situ measurements of particulate inherent optical properties (IOPs) – absorption (<span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span>), scattering (<span class="inline-formula"><i>b</i><sub>p</sub>(<i>λ</i>)</span>), and beam attenuation (<span class="inline-formula"><i>c</i><sub>p</sub>(<i>λ</i>)</span>) – are crucial for the development of optical algorithms that retrieve biogeochemical quantities such as chlorophyll <span class="inline-formula"><i>a</i></span>, particulate organic carbon (POC), and total suspended matter (TSM). Here we present a compilation of particulate absorption–attenuation spectrophotometric data measured underway on nine Atlantic Meridional Transect (AMT) cruises between 50° N and 50° S from 2009–2019. The compilation includes coincident high-performance liquid chromatography (HPLC) phytoplankton pigment concentrations, which are used to calibrate transects of total chlorophyll <span class="inline-formula"><i>a</i></span> (Tot_Chl_a) concentrations derived from the <span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span> line-height method. The IOP data are processed using a consistent methodology and include propagated uncertainties for each IOP variable, uncertainty quantification for the Tot_Chl_a concentrations based on HPLC match-ups, application of consistent quality-control filters, and standardization of output data fields and formats. The total IOP dataset consists of <span class="inline-formula">∼310 000</span> measurements at a 1 min binning (<span class="inline-formula">∼270 000</span> hyper-spectral) and <span class="inline-formula">>700</span> coincident HPLC pigment surface samples (<span class="inline-formula">∼600</span> of which are coincident with hyper-spectral IOPs). We present the geographic variation in the IOPs, HPLC phytoplankton pigments, and <span class="inline-formula"><i>a</i><sub>p</sub></span>-derived Tot_Chl_a concentrations which are shown to have uncertainties between 8 % and 20 %. Additionally, to stimulate further investigation of accessory pigment extraction from <span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span>, we quantify pigment correlation matrices and identify spectral characteristics of end-member <span class="inline-formula"><i>a</i><sub>p</sub>(<i>λ</i>)</span> spectra, where accessory pigment groupings are present in higher concentrations relative to Tot_Chl_a. All data are made publicly available in SeaBASS and NetCDF formats via the following links: <span class="uri">https://seabass.gsfc.nasa.gov/archive/PML/AMT</span> <span class="cit" id="xref_paren.1">(<a href="#bib1.bibx37">Jordan et al.</a>, <a href="#bib1.bibx37">2025</a><a href="#bib1.bibx37">a</a>)</span> and <a href="https://doi.org/10.5281/zenodo.12527954">https://doi.org/10.5281/zenodo.12527954</a> <span class="cit" id="xref_paren.2">(<a href="#bib1.bibx35">Jordan et al.</a>, <a href="#bib1.bibx35">2024</a>)</span>.</p>https://essd.copernicus.org/articles/17/493/2025/essd-17-493-2025.pdf |
| spellingShingle | T. M. Jordan G. Dall'Olmo G. Tilstone R. J. W. Brewin F. Nencioli R. Airs C. S. Thomas L. Schlüter A compilation of surface inherent optical properties and phytoplankton pigment concentrations from the Atlantic Meridional Transect Earth System Science Data |
| title | A compilation of surface inherent optical properties and phytoplankton pigment concentrations from the Atlantic Meridional Transect |
| title_full | A compilation of surface inherent optical properties and phytoplankton pigment concentrations from the Atlantic Meridional Transect |
| title_fullStr | A compilation of surface inherent optical properties and phytoplankton pigment concentrations from the Atlantic Meridional Transect |
| title_full_unstemmed | A compilation of surface inherent optical properties and phytoplankton pigment concentrations from the Atlantic Meridional Transect |
| title_short | A compilation of surface inherent optical properties and phytoplankton pigment concentrations from the Atlantic Meridional Transect |
| title_sort | compilation of surface inherent optical properties and phytoplankton pigment concentrations from the atlantic meridional transect |
| url | https://essd.copernicus.org/articles/17/493/2025/essd-17-493-2025.pdf |
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