Reducing the effects of fouling on chlorophyll estimates derived from long‐term deployments of optical instruments

Davis, Richard F.; Moore, C.; Zaneveld, J. Ronald V.; Napp, Jeffrey M.

doi:10.1029/96jc02430

Cited by 56 publications

(36 citation statements)

References 12 publications

(7 reference statements)

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“…The remaining backscattering is attributed to particles as it is customary, to assume a negligible contribution of CDM to scattering and backscattering (e.g., Mobley, 1994). Chlorophyll concentration was estimated in three ways: (715))}/0.014), e.g., Davis et al (1997), where a p denotes particulate absorption, and the wavelength is given in brackets. The value of the chlorophyll-specific absorption, a*(676) = 0.014 m 2 g chl -1 used here is consistent with published literature values for the oceanic assemblages of phytoplankton (e.g., Sosik & Mitchell, 1995) and was chosen here based on regression of HPLC determination of [chl] versus absorption based [chl].…”

Section: Data Collection and Methods Of Analysismentioning

confidence: 99%

Measurements of spectral optical properties and their relation to biogeochemical variables and processes in Crater Lake, Crater Lake National Park, OR

Boss

Collier

Larson³

et al. 2007

Hydrobiologia

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Section: Data Collection and Methods Of Analysismentioning

confidence: 99%

Measurements of spectral optical properties and their relation to biogeochemical variables and processes in Crater Lake, Crater Lake National Park, OR

Boss

Collier

Larson³

et al. 2007

Hydrobiologia

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“…13 in Crater Lake, measurements of beam attenuation and chlorophyll absorption were made during June and September 2001. Using a 25-cm path-length WetLabs ac-9, we measured beam attenuation by particles at 650 nm and estimated the chlorophyll concentration from the difference in absorption at 676 and 650 nm (Davis et al 1997;Chang and Dickey 2001). Conventional measurements of phytoplankton biovolume and chlorophyll concentration were obtained from bottle samples as described in McIntire et al (1996) and are available for biweekly periods from 1989 to 2000 for June-September.…”

Section: Methodsmentioning

confidence: 99%

Subsurface maxima of phytoplankton and chlorophyll: Steady‐state solutions from a simple model

Fennel

Boss

2003

Limnology & Oceanography

243

208

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In oligotrophic lakes and oceans, the deep chlorophyll maximum may form independently of a maximum of phytoplankton biomass, because the ratio of chlorophyll to phytoplankton biomass (in units of carbon) increases with acclimation to reduced light and increased nutrient supply at depth. Optical data (beam attenuation as proxy for phytoplankton biomass and chlorophyll fluorescence and absorption as proxies for chlorophyll concentration) and conventional measurements of biovolume, particulate organic carbon, and chlorophyll from two oligotrophic systems (Crater Lake, Oregon, and Sta. ALOHA in the subtropical North Pacific Ocean) are presented and show a vertical separation of the maxima of biomass and chlorophyll by 50-80 m during stratified conditions. We use a simple mathematical framework to describe the vertical structure of phytoplankton biomass, nutrients, and chlorophyll and to explore what processes contribute to the generation of vertical maxima. Consistent with the observations, the model suggests that biomass and chlorophyll maxima in stable environments are generated by fundamentally different mechanisms. Maxima in phytoplankton biomass occur where the growth rate is balanced by losses (respiration and grazing) and the divergence in sinking velocity, whereas the vertical distribution of chlorophyll is strongly determined by photoacclimation. A deep chlorophyll maximum is predicted well below the particle maximum by the model. As an interpretation of these results, we suggest a quantitative criterion for the observed coexistence of vertically distinct phytoplankton assemblages in oligotrophic systems: the vertical position at which a species occurs in highest abundance in the water column is determined by the ''general compensation depth''-that is, the depth at which specific growth and all loss rates, including the divergence of sinking/swimming and vertical mixing, balance. This prediction can be tested in the environment when the divergence of sinking and swimming is negligible.

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“…Spectral absorption of particles has been measured in situ using the same filtration system at both low and high spectral resolution. Low spectral resolution data has been used to estimate in-situ chlorophyll concentration from the peak height of the 676 nm Sorret band in an oligotrophic lake (Davis et al, 1997;Boss et al, 2007). High spectral resolution particulate absorption data were shown to provide concentrations of in-situ phytoplankton pigments and hence to extract information on the underlying phytoplankton population (Moisan et al, 2011;Chase et al, 2013).…”

Section: Combination Of Several Optical Properties Spectral Optical Pmentioning

confidence: 99%

Optical techniques for remote and in-situ characterization of particles pertinent to GEOTRACES

Boss

Guidi

Richardson

et al. 2015

Progress in Oceanography

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a b s t r a c tField and laboratory characterization of marine particles is laborious and expensive. Proxies of particle properties have been developed that allow researchers to obtain high frequency distributions of such properties in space or time. We focus on optical techniques used to characterize marine particles in-situ, with a focus on GEOTRACES-relevant properties, such as bulk properties including particle mass, crosssectional area, particle size distribution, particle shape information, and also single particle optical properties, such as individual particle type and size. We also address the use of optical properties of particles to infer particulate organic or inorganic carbon. In addition to optical sensors we review advances in imaging technology and its use to study marine particles in situ. This review addresses commercially available technology and techniques that can be used as a proxy for particle properties and the associated uncertainties with particular focus to open ocean environments, the focus of GEOTRACES.

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Reducing the effects of fouling on chlorophyll estimates derived from long‐term deployments of optical instruments

Cited by 56 publications

References 12 publications

Measurements of spectral optical properties and their relation to biogeochemical variables and processes in Crater Lake, Crater Lake National Park, OR

Measurements of spectral optical properties and their relation to biogeochemical variables and processes in Crater Lake, Crater Lake National Park, OR

Subsurface maxima of phytoplankton and chlorophyll: Steady‐state solutions from a simple model

Optical techniques for remote and in-situ characterization of particles pertinent to GEOTRACES

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