scholarly journals Two databases derived from BGC-Argo float measurements for biogeochemical and bio-optical applications at the global scale

2017 ◽  
Author(s):  
Emanuele Organelli ◽  
Marie Barbieux ◽  
Hervé Claustre ◽  
Catherine Schmechtig ◽  
Antoine Poteau ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Optical Depth ◽  
Open Data ◽  
Temporal Distribution ◽  
Global Scale ◽  
Vertical Profiles ◽  
Photosynthetically Available Radiation ◽  
Global Database ◽  
Fluorescent Dissolved Organic Matter

Abstract. Since 2012, an array of 105 Biogeochemical (BGC) Argo floats has been deployed across the world’s oceans to fill the observational gap characterizing most of open-ocean environments. Profiles of biogeochemical (chlorophyll and fluorescent dissolved organic matter) and optical (single-wavelength particulate optical backscattering, downward irradiance at three wavelengths and photosynthetically available radiation) variables are collected in the upper 1000 m every 1 to 10 days. The global database of 9837 vertical profiles collected up to January 2016 is presented and its spatial and temporal coverage is discussed. Each variable is quality controlled with specifically-developed procedures and its time-series is quality-assessed to identify issues related to biofouling and/or instrumental drift. A second database of 5748 profile-derived products within the first optical depth (i.e. the layer of interest for satellite remote sensing) is also presented and its spatio-temporal distribution discussed. This database, devoted to field and remote ocean color applications, includes diffuse attenuation coefficients for downward irradiance at three narrow wavebands and one broad waveband (photosynthetically available radiation), calibrated chlorophyll and dissolved organic matter fluorescence, and single-wavelength particulate optical backscattering. To demonstrate the applicability of these global databases, data within the first optical depth are finally compared with previously established bio-optical models and used to validate remotely-derived bio-optical products. The quality-controlled databases are publicly available from SEANOE (SEA scieNtific Open data Edition) publisher at http://doi.org/10.17882/49388 and http://doi.org/10.17882/47142 for vertical profiles and products within the first optical depth, respectively.

scholarly journals Two databases derived from BGC-Argo float measurements for marine biogeochemical and bio-optical applications

2017 ◽  
Vol 9 (2) ◽  
pp. 861-880 ◽  
Author(s):  
Emanuele Organelli ◽  
Marie Barbieux ◽  
Hervé Claustre ◽  
Catherine Schmechtig ◽  
Antoine Poteau ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Optical Depth ◽  
Open Data ◽  
Vertical Profiles ◽  
Photosynthetically Available Radiation ◽  
Attenuation Coefficients ◽  
Fluorescent Dissolved Organic Matter ◽  
Optical Applications ◽  
Temporal Coverage

Abstract. Since 2012, an array of 105 Biogeochemical-Argo (BGC-Argo) floats has been deployed across the world's oceans to assist in filling observational gaps that are required for characterizing open-ocean environments. Profiles of biogeochemical (chlorophyll and dissolved organic matter) and optical (single-wavelength particulate optical backscattering, downward irradiance at three wavelengths, and photosynthetically available radiation) variables are collected in the upper 1000 m every 1 to 10 days. The database of 9837 vertical profiles collected up to January 2016 is presented and its spatial and temporal coverage is discussed. Each variable is quality controlled with specifically developed procedures and its time series is quality-assessed to identify issues related to biofouling and/or instrument drift. A second database of 5748 profile-derived products within the first optical depth (i.e., the layer of interest for satellite remote sensing) is also presented and its spatiotemporal distribution discussed. This database, devoted to field and remote ocean color applications, includes diffuse attenuation coefficients for downward irradiance at three narrow wavebands and one broad waveband (photosynthetically available radiation), calibrated chlorophyll and fluorescent dissolved organic matter concentrations, and single-wavelength particulate optical backscattering. To demonstrate the applicability of these databases, data within the first optical depth are compared with previously established bio-optical models and used to validate remotely derived bio-optical products. The quality-controlled databases are publicly available from the SEANOE (SEA scieNtific Open data Edition) publisher at https://doi.org/10.17882/49388 and https://doi.org/10.17882/47142 for vertical profiles and products within the first optical depth, respectively.

Production and degradation of fluorescent dissolved organic matter derived from bacteria

2017 ◽  
Vol 74 (1) ◽  
pp. 39-52 ◽  
Author(s):  
Ken Arai ◽  
Shigeki Wada ◽  
Koichi Shimotori ◽  
Yuko Omori ◽  
Takeo Hama
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Fluorescent Dissolved Organic Matter

Temperature, turbidity, and the inner filter effect correction methodology for analyzing fluorescent dissolved organic matter in urban sewage

2020 ◽  
Vol 27 (28) ◽  
pp. 35712-35723
Author(s):  
Angélique Goffin ◽  
Laura Alejandra Vasquez-Vergara ◽  
Sabrina Guérin-Rechdaoui ◽  
Vincent Rocher ◽  
Gilles Varrault
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Inner Filter Effect ◽  
Urban Sewage ◽  
Fluorescent Dissolved Organic Matter ◽  
Filter Effect

Changes in fluorescent dissolved organic matter and their association with phytoavailable phosphorus in soil amended with TiO2 nanoparticles

Chemosphere ◽  
2019 ◽  
Vol 227 ◽  
pp. 17-25 ◽  
Author(s):  
Zahra Zahra ◽  
Tahir Maqbool ◽  
Muhammad Arshad ◽  
Mohsin Ali Badshah ◽  
Hyung-Kyoon Choi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Tio2 Nanoparticles ◽  
Fluorescent Dissolved Organic Matter

scholarly journals The influence of dissolved organic matter on the marine production of carbonyl sulfide (OCS) and carbon disulfide (CS<sub>2</sub>) in the Peruvian upwelling

Ocean Science ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 1071-1090 ◽  
Author(s):  
Sinikka T. Lennartz ◽  
Marc von Hobe ◽  
Dennis Booge ◽  
Henry C. Bittig ◽  
Tim Fischer ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Carbon Disulfide ◽  
Solid Phase ◽  
Carbonyl Sulfide ◽  
Limiting Factors ◽  
Biogeochemical Model ◽  
Fluorescent Dissolved Organic Matter ◽  
Process Understanding ◽  
Future Emission

Abstract. Oceanic emissions of the climate-relevant trace gases carbonyl sulfide (OCS) and carbon disulfide (CS2) are a major source to their atmospheric budget. Their current and future emission estimates are still uncertain due to incomplete process understanding and therefore inexact quantification across different biogeochemical regimes. Here we present the first concurrent measurements of both gases together with related fractions of the dissolved organic matter (DOM) pool, i.e., solid-phase extractable dissolved organic sulfur (DOSSPE, n=24, 0.16±0.04 µmol L−1), chromophoric (CDOM, n=76, 0.152±0.03), and fluorescent dissolved organic matter (FDOM, n=35), from the Peruvian upwelling region (Guayaquil, Ecuador to Antofagasta, Chile, October 2015). OCS was measured continuously with an equilibrator connected to an off-axis integrated cavity output spectrometer at the surface (29.8±19.8 pmol L−1) and at four profiles ranging down to 136 m. CS2 was measured at the surface (n=143, 17.8±9.0 pmol L−1) and below, ranging down to 1000 m (24 profiles). These observations were used to estimate in situ production rates and identify their drivers. We find different limiting factors of marine photoproduction: while OCS production is limited by the humic-like DOM fraction that can act as a photosensitizer, high CS2 production coincides with high DOSSPE concentration. Quantifying OCS photoproduction using a specific humic-like FDOM component as proxy, together with an updated parameterization for dark production, improves agreement with observations in a 1-D biogeochemical model. Our results will help to better predict oceanic concentrations and emissions of both gases on regional and, potentially, global scales.

Carbon monoxide emissions by phytoplankton: evidence from laboratory experiments

2009 ◽  
Vol 6 (5) ◽  
pp. 369 ◽  
Author(s):  
Valérie Gros ◽  
Ilka Peeken ◽  
Katrin Bluhm ◽  
Eckart Zöllner ◽  
Roland Sarda-Esteve ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Atmospheric Chemistry ◽  
Laboratory Experiments ◽  
Euphotic Zone ◽  
Global Scale ◽  
Emission Rates ◽  
Direct Production ◽  
Diurnal Cycles

Environmental context. Carbon monoxide (CO) is a key component for atmospheric chemistry and its production in the ocean, although minor at the global scale, could play a significant role in the remote marine atmosphere. Up to now, CO production in the ocean was considered to mainly originate from the photo-production of dissolved organic matter (mainly under UV radiation). In this paper, we show evidence for direct production of CO by phytoplankton and we suggest it as a significant mechanism for CO production in the ocean. Abstract. In order to investigate carbon monoxide (CO) emissions by phytoplankton organisms, a series of laboratory experiments was conducted in Kiel (Germany). Nine monocultures, including diatoms, coccolithophorids, chlorophytes and cyanobacteria have been characterised. This was done by following the CO variations from monoculture aliquots exposed to photosynthetically active radiation during one or two complete diurnal cycles. All the studied cultures have shown significant CO production when illuminated. Emission rates have been estimated to range from 1.4 × 10–5 to 8.7 × 10–4 μg of CO μg chlorophyll–1 h–1 depending on the species. When considering the magnitude of the emission rates from the largest CO emitters (cyanobacteria and diatoms), this biotic source could represent up to 20% of the CO produced in oceanic waters. As global models currently mainly consider CO production from the photo-degradation of dissolved organic matter, this study suggests that biotic CO production should also be taken into account. Whether this biological production might also contribute to some degree to the previous observed non-zero CO production below the euphotic zone (dark CO production) cannot be deduced here and needs to be further investigated.

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