Articles | Volume 12, issue 13
https://doi.org/10.5194/bg-12-4051-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-12-4051-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
07 Jul 2015
Research article |
| 07 Jul 2015
High-resolution analysis of a North Sea phytoplankton community structure based on in situ flow cytometry observations and potential implication for remote sensing
M. Thyssen
CORRESPONDING AUTHOR
Université Lille Nord de France, CNRS UMR8187 Laboratoire d'Océanologie et de Géosciences, Université du Littoral Côte d'Opale, MREN, 32 Avenue Foch, 62930 Wimereux, France
now at: Aix Marseille Université, CNRS/INSU, IRD, Mediterranean Institute of Oceanography (MIO), UM110, 13288 Marseille, France
S. Alvain
Université Lille Nord de France, CNRS UMR8187 Laboratoire d'Océanologie et de Géosciences, Université du Littoral Côte d'Opale, MREN, 32 Avenue Foch, 62930 Wimereux, France
A. Lefèbvre
Laboratoire Environnement Ressources (LER), 150 quai Gambetta, 62200, Boulogne sur Mer, France
D. Dessailly
Université Lille Nord de France, CNRS UMR8187 Laboratoire d'Océanologie et de Géosciences, Université du Littoral Côte d'Opale, MREN, 32 Avenue Foch, 62930 Wimereux, France
M. Rijkeboer
RWS Centre for Water Management, Laboratory for Hydrobiological Analysis, Zuiderwagenplein 2, 8224 AD Lelystad, the Netherlands
N. Guiselin
Université Lille Nord de France, CNRS UMR8187 Laboratoire d'Océanologie et de Géosciences, Université du Littoral Côte d'Opale, MREN, 32 Avenue Foch, 62930 Wimereux, France
V. Creach
The Centre for Environment, Fisheries and Aquaculture Science (Cefas), Pakefield Road, NR33 0HT Lowestoft, UK
L.-F. Artigas
Université Lille Nord de France, CNRS UMR8187 Laboratoire d'Océanologie et de Géosciences, Université du Littoral Côte d'Opale, MREN, 32 Avenue Foch, 62930 Wimereux, France
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We compared the ability of in situ spectral and satellite sensors to estimate the productivity of Mediterranean grasslands undergoing different fertilization treatments. The objective of the study was to identify the best set of spectral predictors. In situ CO gas exchange and vegetation reflectance measurements were used for this purpose. Our results show the potential of Sentinel 2 and Landsat 8 satellites to monitor grasslands in support of a sustainable agriculture management.
Philipp M. M. Groetsch, Stefan G. H. Simis, Marieke A. Eleveld, and Steef W. M. Peters
Biogeosciences, 13, 4959–4973, https://doi.org/10.5194/bg-13-4959-2016, https://doi.org/10.5194/bg-13-4959-2016, 2016
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Phytoplankton spring bloom phenology was derived from a 15-year time series (2000–2014) of ship-of-opportunity chlorophyll a fluorescence observations in the Baltic Sea. Bloom peak concentrations have declined over the study period, while bloom duration has increased. It is concluded that nutrient reduction efforts led to decreasing bloom intensity, while changes in Baltic Sea environmental conditions associated with global change corresponded to a lengthening spring bloom period.
Rebecca N. Handcock, D. L. Gobbett, Luciano A. González, Greg J. Bishop-Hurley, and Sharon L. McGavin
Biogeosciences, 13, 4673–4695, https://doi.org/10.5194/bg-13-4673-2016, https://doi.org/10.5194/bg-13-4673-2016, 2016
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Proximal sensors can assist in managing feed in livestock production systems but raw data needs calibration to biophysical values such as biomass and ground cover. Our pilot project monitored tropical pastures for 18 months using digital cameras, multispectral sensors, soil moisture sensors, and field observations. We developed stringent data cleaning rules that are applicable to other sensor projects. Proximal sensors were found to deliver continual and timely pasture data.
T. Tagesson, R. Fensholt, S. Huber, S. Horion, I. Guiro, A. Ehammer, and J. Ardö
Biogeosciences, 12, 4621–4635, https://doi.org/10.5194/bg-12-4621-2015, https://doi.org/10.5194/bg-12-4621-2015, 2015
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Relationships between ecosystem properties of semi-arid savanna and reflected solar radiance between 35 and 1800nm were investigated. Normalised combinations of reflectance for the near infrared, shortwave infrared, and 600 to 700nm were strongly affected by solar and viewing angle effects. Ecosystem properties of savannas were strongly correlated with reflectance at 350-1800nm, and normalised combinations of reflectance were strong predictors of the savanna ecosystem properties.
L. Peperzak, H. J. van der Woerd, and K. R. Timmermans
Biogeosciences, 12, 1659–1670, https://doi.org/10.5194/bg-12-1659-2015, https://doi.org/10.5194/bg-12-1659-2015, 2015
T. Hakala, O. Nevalainen, S. Kaasalainen, and R. Mäkipää
Biogeosciences, 12, 1629–1634, https://doi.org/10.5194/bg-12-1629-2015, https://doi.org/10.5194/bg-12-1629-2015, 2015
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A hyperspectral lidar produces point clouds with multiple spectral channels (colours) for each point. We measured a pine and used the spectral content to estimate chlorophyll content. We validated these results using chemical laboratory analysis of needles taken from the pine. Our prototype has limitations, but still shows the great potential of coloured point clouds. Potential applications include forestry, security, archaeology and city modelling.
C. Lin, S. C. Popescu, S. C. Huang, P. T. Chang, and H. L. Wen
Biogeosciences, 12, 49–66, https://doi.org/10.5194/bg-12-49-2015, https://doi.org/10.5194/bg-12-49-2015, 2015
N. K. Ganju, J. L. Miselis, and A. L. Aretxabaleta
Biogeosciences, 11, 7193–7205, https://doi.org/10.5194/bg-11-7193-2014, https://doi.org/10.5194/bg-11-7193-2014, 2014
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Light availability to seagrass is an important factor in their success. We deployed instrumentation to measure light in Barnegat Bay, New Jersey, and found lower availability in the southern bay due to high turbidity (suspended sediment), while the northern bay has higher availability. In the northern bay, dissolved organic material and chlorophyll are most responsible for blocking light to the seagrass canopy. We also found that boat wakes do not have a large effect on sediment resuspension.
M. W. Matthews and S. Bernard
Biogeosciences, 10, 8139–8157, https://doi.org/10.5194/bg-10-8139-2013, https://doi.org/10.5194/bg-10-8139-2013, 2013
P. Chatzimpiros and S. Barles
Biogeosciences, 10, 471–481, https://doi.org/10.5194/bg-10-471-2013, https://doi.org/10.5194/bg-10-471-2013, 2013
M. Rossini, S. Cogliati, M. Meroni, M. Migliavacca, M. Galvagno, L. Busetto, E. Cremonese, T. Julitta, C. Siniscalco, U. Morra di Cella, and R. Colombo
Biogeosciences, 9, 2565–2584, https://doi.org/10.5194/bg-9-2565-2012, https://doi.org/10.5194/bg-9-2565-2012, 2012
A. Fujiwara, T. Hirawake, K. Suzuki, and S.-I. Saitoh
Biogeosciences, 8, 3567–3580, https://doi.org/10.5194/bg-8-3567-2011, https://doi.org/10.5194/bg-8-3567-2011, 2011
C. Höpfner and D. Scherer
Biogeosciences, 8, 3359–3373, https://doi.org/10.5194/bg-8-3359-2011, https://doi.org/10.5194/bg-8-3359-2011, 2011
F. Gao, S. Stanič, K. Bergant, T. Bolte, F. Coren, T.-Y. He, A. Hrabar, J. Jerman, A. Mladenovič, J. Turšič, D. Veberič, and M. Iršič Žibert
Biogeosciences, 8, 2351–2363, https://doi.org/10.5194/bg-8-2351-2011, https://doi.org/10.5194/bg-8-2351-2011, 2011
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Short summary
Phytoplankton community structure at a high spatial resolution (<3km) was studied in the North Sea during a cruise in May 2011. A first comparison with PHYSAT reflectance anomalies enables the extrapolation of the community structure rather than a dominant type at the North Sea scale and was interpreted with its hydrological characteristics. This will seriously improve our understanding of the influence of community structure on biogeochemical processes at the daily and basin scales.
Phytoplankton community structure at a high spatial resolution (3km) was studied in the North...
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