Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait
Phytoplankton in the ocean are extremely diverse. The abundance of various intracellular pigments are often used to study phytoplankton physiology and ecology, and identify and quantify different phytoplankton groups. In this study, phytoplankton absorption spectra ( aph(λ) ) derived from underway f...
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fthzgzmk:oai:publications.hereon.de:36569 2023-06-11T04:11:45+02:00 Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait Liu, Y. Boss, E. Chase, A. Xi, H. Zhang, X. Roettgers, R. Pan, Y. Bracher, A. 2019 https://publications.hereon.de/id/36569 https://publications.hzg.de/id/36569 https://doi.org/10.3390/rs11030318 en eng MDPI https://dx.doi.org/10.3390/rs11030318 urn:issn:2072-4292 https://publications.hereon.de/id/36569 https://publications.hzg.de/id/36569 info:eu-repo/semantics/openAccess open_access oa_gold issn:2072-4292 Liu, Y.; Boss, E.; Chase, A.; Xi, H.; Zhang, X.; Roettgers, R.; Pan, Y.; Bracher, A.: Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait. In: Remote Sensing. Vol. 11 (2019) 3, 318. (DOI: /10.3390/rs11030318) info:eu-repo/semantics/article Zeitschrift Artikel 2019 fthzgzmk https://doi.org/10.3390/rs11030318 2023-05-28T23:24:45Z Phytoplankton in the ocean are extremely diverse. The abundance of various intracellular pigments are often used to study phytoplankton physiology and ecology, and identify and quantify different phytoplankton groups. In this study, phytoplankton absorption spectra ( aph(λ) ) derived from underway flow-through AC-S measurements in the Fram Strait are combined with phytoplankton pigment measurements analyzed by high-performance liquid chromatography (HPLC) to evaluate the retrieval of various pigment concentrations at high spatial resolution. The performances of two approaches, Gaussian decomposition and the matrix inversion technique are investigated and compared. Our study is the first to apply the matrix inversion technique to underway spectrophotometry data. We find that Gaussian decomposition provides good estimates (median absolute percentage error, MPE 21–34%) of total chlorophyll-a (TChl-a), total chlorophyll-b (TChl-b), the combination of chlorophyll-c1 and -c2 (Chl-c1/2), photoprotective (PPC) and photosynthetic carotenoids (PSC). This method outperformed one of the matrix inversion algorithms, i.e., singular value decomposition combined with non-negative least squares (SVD-NNLS), in retrieving TChl-b, Chl-c1/2, PSC, and PPC. However, SVD-NNLS enables robust retrievals of specific carotenoids (MPE 37–65%), i.e., fucoxanthin, diadinoxanthin and 19 ′ -hexanoyloxyfucoxanthin, which is currently not accomplished by Gaussian decomposition. More robust predictions are obtained using the Gaussian decomposition method when the observed aph(λ) is normalized by the package effect index at 675 nm. The latter is determined as a function of “packaged” aph(675) and TChl-a concentration, which shows potential for improving pigment retrieval accuracy by the combined use of aph(λ) and TChl-a concentration data. To generate robust estimation statistics for the matrix inversion technique, we combine leave-one-out cross-validation with data perturbations. We find that both approaches provide useful information on pigment ... Article in Journal/Newspaper Fram Strait Hereon Publications (Helmholtz-Zentrum) Remote Sensing 11 3 318 |
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Open Polar |
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Hereon Publications (Helmholtz-Zentrum) |
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fthzgzmk |
language |
English |
description |
Phytoplankton in the ocean are extremely diverse. The abundance of various intracellular pigments are often used to study phytoplankton physiology and ecology, and identify and quantify different phytoplankton groups. In this study, phytoplankton absorption spectra ( aph(λ) ) derived from underway flow-through AC-S measurements in the Fram Strait are combined with phytoplankton pigment measurements analyzed by high-performance liquid chromatography (HPLC) to evaluate the retrieval of various pigment concentrations at high spatial resolution. The performances of two approaches, Gaussian decomposition and the matrix inversion technique are investigated and compared. Our study is the first to apply the matrix inversion technique to underway spectrophotometry data. We find that Gaussian decomposition provides good estimates (median absolute percentage error, MPE 21–34%) of total chlorophyll-a (TChl-a), total chlorophyll-b (TChl-b), the combination of chlorophyll-c1 and -c2 (Chl-c1/2), photoprotective (PPC) and photosynthetic carotenoids (PSC). This method outperformed one of the matrix inversion algorithms, i.e., singular value decomposition combined with non-negative least squares (SVD-NNLS), in retrieving TChl-b, Chl-c1/2, PSC, and PPC. However, SVD-NNLS enables robust retrievals of specific carotenoids (MPE 37–65%), i.e., fucoxanthin, diadinoxanthin and 19 ′ -hexanoyloxyfucoxanthin, which is currently not accomplished by Gaussian decomposition. More robust predictions are obtained using the Gaussian decomposition method when the observed aph(λ) is normalized by the package effect index at 675 nm. The latter is determined as a function of “packaged” aph(675) and TChl-a concentration, which shows potential for improving pigment retrieval accuracy by the combined use of aph(λ) and TChl-a concentration data. To generate robust estimation statistics for the matrix inversion technique, we combine leave-one-out cross-validation with data perturbations. We find that both approaches provide useful information on pigment ... |
format |
Article in Journal/Newspaper |
author |
Liu, Y. Boss, E. Chase, A. Xi, H. Zhang, X. Roettgers, R. Pan, Y. Bracher, A. |
spellingShingle |
Liu, Y. Boss, E. Chase, A. Xi, H. Zhang, X. Roettgers, R. Pan, Y. Bracher, A. Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait |
author_facet |
Liu, Y. Boss, E. Chase, A. Xi, H. Zhang, X. Roettgers, R. Pan, Y. Bracher, A. |
author_sort |
Liu, Y. |
title |
Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait |
title_short |
Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait |
title_full |
Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait |
title_fullStr |
Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait |
title_full_unstemmed |
Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait |
title_sort |
retrieval of phytoplankton pigments from underway spectrophotometry in the fram strait |
publisher |
MDPI |
publishDate |
2019 |
url |
https://publications.hereon.de/id/36569 https://publications.hzg.de/id/36569 https://doi.org/10.3390/rs11030318 |
genre |
Fram Strait |
genre_facet |
Fram Strait |
op_source |
issn:2072-4292 Liu, Y.; Boss, E.; Chase, A.; Xi, H.; Zhang, X.; Roettgers, R.; Pan, Y.; Bracher, A.: Retrieval of Phytoplankton Pigments from Underway Spectrophotometry in the Fram Strait. In: Remote Sensing. Vol. 11 (2019) 3, 318. (DOI: /10.3390/rs11030318) |
op_relation |
https://dx.doi.org/10.3390/rs11030318 urn:issn:2072-4292 https://publications.hereon.de/id/36569 https://publications.hzg.de/id/36569 |
op_rights |
info:eu-repo/semantics/openAccess open_access oa_gold |
op_doi |
https://doi.org/10.3390/rs11030318 |
container_title |
Remote Sensing |
container_volume |
11 |
container_issue |
3 |
container_start_page |
318 |
_version_ |
1768387053350813696 |