Phytoplankton Pigments
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Phytoplankton Pigments
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Author : Suzanne Roy
language : en
Publisher: Cambridge University Press
Release Date : 2011-10-27
Phytoplankton Pigments written by Suzanne Roy and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-10-27 with Science categories.
Pigments act as tracers to elucidate the fate of phytoplankton in the world's oceans and are often associated with important biogeochemical cycles related to carbon dynamics in the oceans. They are increasingly used in in situ and remote-sensing applications, detecting algal biomass and major taxa through changes in water colour. This book is a follow-up to the 1997 volume Phytoplankton Pigments in Oceanography (UNESCO Press). Since then, there have been many advances concerning phytoplankton pigments. This book includes recent discoveries on several new algal classes particularly for the picoplankton, and on new pigments. It also includes many advances in methodologies, including liquid chromatography-mass spectrometry (LC-MS) and developments and updates on the mathematical methods used to exploit pigment information and extract the composition of phytoplankton communities. The book is invaluable primarily as a reference for students, researchers and professionals in aquatic science, biogeochemistry and remote sensing.
Phytoplankton Pigments In Oceanography
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Author : International Council of Scientific Unions. Scientific Committee on Oceanic Research
language : en
Publisher: Unesco
Release Date : 1997
Phytoplankton Pigments In Oceanography written by International Council of Scientific Unions. Scientific Committee on Oceanic Research and has been published by Unesco this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Marine algae categories.
This comprehensive work stems from the activities of SCOR Working Group 78 (Determination of Photosynthetic Pigments in Seawater) established in 1985. It brings together in one volume all the oceanographer needs to measure and identify pigments as well as to select the most appropriate methods and ensure the best analytical quality control.
Phytoplankton Pigments
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Author : Suzanne Roy
language : en
Publisher:
Release Date : 2011
Phytoplankton Pigments written by Suzanne Roy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Algae categories.
Describes recent advances in the study and use of phytoplankton pigments for students, researchers and professionals in aquatic science, biogeochemistry and remote sensing.
Phytoplankton Pigments
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Author : Suzanne Roy
language : en
Publisher:
Release Date : 2011
Phytoplankton Pigments written by Suzanne Roy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Algae categories.
Describes recent advances in the study and use of phytoplankton pigments for students, researchers and professionals in aquatic science, biogeochemistry and remote sensing.
Studies On The Distribution Of Phytoplankton Pigments And Nutrients In The Milwaukee Harbor Area And Factors Controlling Assimilation Numbers
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Author : Max L. Bothwell
language : en
Publisher:
Release Date : 1975
Studies On The Distribution Of Phytoplankton Pigments And Nutrients In The Milwaukee Harbor Area And Factors Controlling Assimilation Numbers written by Max L. Bothwell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Harbors categories.
Phytoplankton Pigment Data Prydz Bay Region Sibex Ii
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Author : Simon W. Wright
language : en
Publisher:
Release Date : 1987
Phytoplankton Pigment Data Prydz Bay Region Sibex Ii written by Simon W. Wright and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with High performance liquid chromatography categories.
Diurnal Study Of Phytoplankton Pigments
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Author : Charles S. Yentsch
language : en
Publisher:
Release Date : 1961
Diurnal Study Of Phytoplankton Pigments written by Charles S. Yentsch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with categories.
Estimating Phytoplankton Pigments In The Changing Arctic Ocean
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Author : Yangyang Liu
language : en
Publisher:
Release Date : 2022
Estimating Phytoplankton Pigments In The Changing Arctic Ocean written by Yangyang Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Human-induced climate change is amplified in the Arctic. At the root of these amplifications are changes in air temperature and sea ice. The sea-ice cover is dramatically receding in the Arctic Ocean. In the study region of the thesis, the Fram Strait (the largest and only deep gateway to the Arctic Ocean) and its vicinity, changes have been observed in sea-ice conditions and water temperatures due to Arctic warming. This has consequences for phytoplankton. Phytoplankton are one of the main primary producers in the Arctic Ocean. Arctic warming induced alterations in light and nutrient regimes impact phytoplankton seasonality, biomass, community composition and distribution. Phytoplankton biomass and community composition are often indicated by their pigment composition and concentrations. To study the response of phytoplankton to the changing climate, this thesis aims to estimate phytoplankton pigments using observations from the shipboard underway flow-through AC-S spectrophotometer system and the Regulated Ecosystem model version 2 (REcoM2) (Hohn, 2008; Schartau et al., 2007) implemented with phytoplankton growth and photoinhibition models. In the first part of the thesis, an underway flow-through AC-S system was set up onboard R.V. Polarstern during two Fram Strait cruises, PS93.2 and PS99.2. Hyperspectral particulate absorption coefficient was derived from the underway AC-S measurements. Particulate absorption line height at 676 nm calculated from particulate absorption coefficient was empirically related to high performance liquid chromatography (HPLC) chlorophyll a (Chl a) concentrations for PS93.2 and PS99.2, respectively. Both relationships were applied to high frequency (4 Hz) AC-S data to estimate Chl a concentrations along the cruise tracks. In total, 24424 and 16110 Chl a data points were generated for PS93.2 and PS99.2, respectively. The reconstructed AC-S Chl a data sets were used to evaluate seven satellite Chl a algorithms. The number of AC-S-satellite match-ups is over one order of magnitude greater than HPLC-satellite match-ups. AC-S-satellite match-ups show that all algorithms were characterized by an overestimation of satellite Chl a. Two algorithms based on Polymer atmospheric correction processors (Steinmetz et al., 2011) generated data products with relatively high estimation precision and small error. The Polymer atmospheric correction processors account for sun glint and thin clouds in their reflectance models to derive atmospheric corrected remote sensing reflectance, allowing a much larger spatial coverage of data than using standard atmospheric correction processors. In the Arctic Ocean where operational satellite ocean color data have relatively low space-time resolution, Polymer algorithms are promising candidates in enlarging satellite ocean color data sets, e.g., for Sentinel-3/OLCI satellite sensor, given more validation activities are performed in the future. In the second part of the thesis, the underway flow-through AC-S system was set up onboard R.V. Polarstern during the Fram Strait cruise PS107, in addition to PS93.2 and PS99.2. AC-S derived hyperspectral particulate absorption coefficient were matched with HPLC pigments data. In total, 298 match-ups were used as the pigment retrieval data set. Two pigment retrieval algorithms, Gaussian decomposition (Chase et al., 2013) and the singular value decomposition combined with non-negative least squares (SVD-NNLS) inversion method (Moisan et al., 2011) were compared and optimized for estimating various phytoplankton pigments or pigment groups from the particulate absorption coefficient data. The Gaussian decomposition method provides good estimates (median absolute percentage error, MPE 21-34%) of Chl a, chlorophyll b, chlorophyll c1 and c2, photosynthetic carotenoids and photoprotective carotenoids (PPC). This method outperformed the SVD-NNLS method in retrieving chlorophyll b, chlorophyll c1 and c2, photosynthetic carotenoids, 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 spectral phytoplankton absorption coefficient is normalized by the package effect index at 675 nm. The latter is determined as a function of ”packaged” phytoplankton absorption coefficient at 675 nm and Chl a concentrations, which shows potential for improving pigment retrieval accuracy by the combined use of phytoplankton absorption coefficient and Chl a data. Both approaches provide useful information on pigment distribution, and hence phytoplankton community composition indicators, at a spatial resolution much finer than can be achieved with discrete HPLC samples. Xanthophyll pigments provide one of the most important photoprotective mechanisms to dissipate the excess light energy and prevent photoinhibition. In the third part of the thesis, phytoplankton growth models of Geider et al. (1998), the Geider model, and Marshall et al. (2000), the Marshall model, were implemented into REcoM2 to predict the photoprotective needs of phytoplankton and their attributions from phytoplankton PPC, physiological state, and community composition. Assume that photoinhibition is negligible in phytoplankton communities acclimated to ambient light (Cullen et al., 1992). The difference between the photosynthesis-irradiance (P-E) curves with (Marshall) and without photoinhibition (Geider) is considered a measure of photoprotective needs in order to minimize such photoinhibition. The degree of phytoplankton photoprotection is represented by the difference of the initial slopes of the P-E curves between the Marshall and Geider models. It was then related to the HPLC PPC/Chl a data, producing a 4-D global map of PPC/Chl a estimates. These estimates were in agreement with field observations in most of the surface ocean, at depth and even across seasons, suggesting the role of PPC in photoprotective activities in the global ocean. However, at higher latitudes, discrepancies between predictions and observations suggested PPC content was insufficient to satisfy phytoplankton protective needs the community and thus other mechanisms of nonphotochemical quenching were relevant. Furthermore, at higher latitudes, changes in PPC content can result from both physiological acclimation and shifts in community composition while in the rest of ocean taxonomic changes played a main role. A comprehensive view of the phytoplankton community pigment signature is crucial for modeling the coupling of light absorption to carbon fixation in the ocean. Future validation of the above model can use the combined HPLC observations and pigment estimates from underway flow-through AC-S system. Furthermore, this work provides insights on how much of the variability in community PPC ratios is attributable to changes in community composition or changes in physiological state. This may allow an improvement of the match between satellite ocean color data and the underlying phytoplankton community. In addition, these insights may contribute to a better understanding of the effect of phytoplankton photoacclimation on the accuracy of satellite ocean color products in the Arctic Ocean.
Absorption Spectrum Of Phytoplankton Pigments Derived From Hyperspectral Remote Sensing Reflectance
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Author :
language : en
Publisher:
Release Date : 2004
Absorption Spectrum Of Phytoplankton Pigments Derived From Hyperspectral Remote Sensing Reflectance written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
For a data set collected around Baja California with chlorophyll-a concentration ((chl-a)) ranging from 0.16 to 11.3 mg/cubic meter, hyperspectral absorption spectra of phytoplankton pigments were independently inverted from hyperspectral remote-sensing reflectance using a newly developed ocean-color algorithm. The derived spectra were then compared with those measured from water samples using the filter-pad technique, and an average difference of 21.4% was obtained. These results demonstrate that the inversion algorithm worked quite well for the coastal waters observed, and suggest a potential of using hyperspectral remote sensing to retrieve both chlorophyll-a and other accessory pigments. (7 figures, 47 refs.).
Spatio Temporal Distribution Of Phytoplankton Pigments In Northumberland Strait
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Author : César Fuentes-Yaco
language : en
Publisher: Mont-Joli, Québec : Fisheries and Oceans Canada
Release Date : 1998
Spatio Temporal Distribution Of Phytoplankton Pigments In Northumberland Strait written by César Fuentes-Yaco and has been published by Mont-Joli, Québec : Fisheries and Oceans Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Artificial satellites in remote sensing categories.