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Full-Text Articles in Physical Sciences and Mathematics
Chlorophyll Absorption And Phytoplankton Size Information Inferred From Hyperspectral Particulate Beam Attenuation, Henry F. Houskeeper, David Draper, Raphael M. Kudela, Emmanuel Boss
Chlorophyll Absorption And Phytoplankton Size Information Inferred From Hyperspectral Particulate Beam Attenuation, Henry F. Houskeeper, David Draper, Raphael M. Kudela, Emmanuel Boss
Marine Sciences Faculty Scholarship
Electromagnetic theory predicts spectral dependencies in extinction efficiency near a narrow absorption band for a particle with an index of refraction close to that of the medium in which it is immersed. These absorption band effects are anticipated in oceanographic beam-attenuation (beam-c) spectra, primarily due to the narrow red peak in absorption produced by the phytoplankton photopigment, chlorophyll a (Chl a). Here we present a method to obtain Chl a absorption and size information by analyzing an eigendecomposition of hyperspectral beam-c residuals measured in marine surface waters by an automatic underway system. We find that three principal modes capture more …
Phytoplankton Phenology In The North Atlantic: Insights From Profiling Float Measurements, Bo Yang, Emmanuel S. Boss, Nils Haëntjens, Matthew C. Long, Michael J. Behrenfeld, Rachel Eveleth, Scott C. Doney
Phytoplankton Phenology In The North Atlantic: Insights From Profiling Float Measurements, Bo Yang, Emmanuel S. Boss, Nils Haëntjens, Matthew C. Long, Michael J. Behrenfeld, Rachel Eveleth, Scott C. Doney
Marine Sciences Faculty Scholarship
There was a typographical error in Equation (1) of our article, where the first term in the denominator should be 0.022 rather than 0.22. The fully corrected equation should be: (Formula presented.). The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.
Underway Spectrophotometry Along The Atlantic Meridional Transect Reveals High Performance In Satellite Chlorophyll Retrievals, Robert J.W. Brewin, Giorgio Dall'olmo, Silvia Pardo, Virginie Van Dongen-Vogels, Emmanuel S. Boss
Underway Spectrophotometry Along The Atlantic Meridional Transect Reveals High Performance In Satellite Chlorophyll Retrievals, Robert J.W. Brewin, Giorgio Dall'olmo, Silvia Pardo, Virginie Van Dongen-Vogels, Emmanuel S. Boss
Marine Sciences Faculty Scholarship
To evaluate the performance of ocean-colour retrievals of total chlorophyll-a concentration requires direct comparison with concomitant and co-located in situ data. For global comparisons, these in situ match-ups should be ideally representative of the distribution of total chlorophyll-a concentration in the global ocean. The oligotrophic gyres constitute the majority of oceanic water, yet are under-sampled due to their inaccessibility and under-represented in global in situ databases. The Atlantic Meridional Transect (AMT) is one of only a few programmes that consistently sample oligotrophic waters. In this paper, we used a spectrophotometer on two AMT cruises (AMT19 and AMT22) to continuously measure …
Regional Ocean-Colour Chlorophyll Algorithms For The Red Sea, Robert J.W. Brewin, Dionysios E. Raitsos, Giorgio Dall'olmo, Nikolaos Zarokanellos, Thomas Jackson, Marie Fanny Racault, Emmanuel S. Boss, Shubha Sathyendranath, Burt H. Jones, Ibrahim Hoteit
Regional Ocean-Colour Chlorophyll Algorithms For The Red Sea, Robert J.W. Brewin, Dionysios E. Raitsos, Giorgio Dall'olmo, Nikolaos Zarokanellos, Thomas Jackson, Marie Fanny Racault, Emmanuel S. Boss, Shubha Sathyendranath, Burt H. Jones, Ibrahim Hoteit
Marine Sciences Faculty Scholarship
The Red Sea is a semi-enclosed tropical marine ecosystem that stretches from the Gulf of Suez and Gulf of Aqaba in the north, to the Gulf of Aden in the south. Despite its ecological and economic importance, its biological environment is relatively unexplored. Satellite ocean-colour estimates of chlorophyll concentration (an index of phytoplankton biomass) offer an observational platform to monitor the health of the Red Sea. However, little is known about the optical properties of the region. In this paper, we investigate the optical properties of the Red Sea in the context of satellite ocean-colour estimates of chlorophyll concentration. Making …
In Situ Measurements Of Phytoplankton Fluorescence Using Low Cost Electronics, Thomas Leeuw, Emmanuel S. Boss, Dana L. Wright
In Situ Measurements Of Phytoplankton Fluorescence Using Low Cost Electronics, Thomas Leeuw, Emmanuel S. Boss, Dana L. Wright
Marine Sciences Faculty Scholarship
Chlorophyll a fluorometry has long been used as a method to study phytoplankton in the ocean. In situ fluorometry is used frequently in oceanography to provide depth-resolved estimates of phytoplankton biomass. However, the high price of commercially manufactured in situ fluorometers has made them unavailable to some individuals and institutions. Presented here is an investigation into building an in situ fluorometer using low cost electronics. The goal was to construct an easily reproducible in situ fluorometer from simple and widely available electronic components. The simplicity and modest cost of the sensor makes it valuable to students and professionals alike. Open …