globalchange  > 气候变化事实与影响
DOI: 10.1002/2014GB004852
Scopus ID: 2-s2.0-84908044755
The significance of the episodic nature of atmospheric deposition to Low Nutrient Low Chlorophyll regions
Author: Guieu C; , Aumont O; , Paytan A; , Bopp L; , Law C; S; , Mahowald N; , Achterberg E; P; , Marañón E; , Salihoglu B; , Crise A; , Wagener T; , Herut B; , Desboeufs K; , Kanakidou M; , Olgun N; , Peters F; , Pulido-Villena E; , Tovar-Sanchez A; , Völker C
Source Publication: Global Biogeochemical Cycles
ISSN: 8866236
Publishing Year: 2014
Volume: 28, Issue:11
pages begin: 1179
pages end: 1198
Language: 英语
Scopus Keyword: atmospheric deposition ; bioassay ; carbon balance ; carbon sequestration ; chlorophyll ; episodic event ; growth rate ; microbial activity ; oligotrophic environment ; phytoplankton ; surface water ; synoptic meteorology ; timescale ; Bacteria (microorganisms)
English Abstract: In the vast Low Nutrient Low-Chlorophyll (LNLC) Ocean, the vertical nutrient supply from the subsurface to the sunlit surface waters is low, and atmospheric contribution of nutrients may be one order of magnitude greater over short timescales. The short turnover time of atmospheric Fe and N supply (<1 month for nitrate) further supports deposition being an important source of nutrients in LNLC regions. Yet, the extent to which atmospheric inputs are impacting biological activity and modifying the carbon balance in oligotrophic environments has not been constrained. Here, we quantify and compare the biogeochemical impacts of atmospheric deposition in LNLC regions using both a compilation of experimental data and model outputs. A metadata-analysis of recently conducted field and laboratory bioassay experiments reveals complex responses, and the overall impact is not a simple "fertilization effect of increasing phytoplankton biomass" as observed in HNLC regions. Although phytoplankton growth may be enhanced, increases in bacterial activity and respiration result in weakening of biological carbon sequestration. The application of models using climatological or time-averaged non-synoptic deposition rates produced responses that were generally much lower than observed in the bioassay experiments. We demonstrate that experimental data and model outputs show better agreement on short timescale (days to weeks) when strong synoptic pulse of aerosols deposition, similar in magnitude to those observed in the field and introduced in bioassay experiments, is superimposed over the mean atmospheric deposition fields. These results suggest that atmospheric impacts in LNLC regions have been underestimated by models, at least at daily to weekly timescales, as they typically overlook large synoptic variations in atmospheric deposition and associated nutrient and particle inputs. Inclusion of the large synoptic variability of atmospheric input, and improved representation and parameterization of key processes that respond to atmospheric deposition, is required to better constrain impacts in ocean biogeochemical models. This is critical for understanding and prediction of current and future functioning of LNLC regions and their contribution to the global carbon cycle. ©2014. American Geophysical Union. All Rights Reserved.
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Document Type: 期刊论文
Appears in Collections:气候变化事实与影响

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Affiliation: Laboratoire d'Océanographie de Villefranche (LOV), UMR7093, CNRS-INSU-Université Paris 6, Villefranche sur Mer, France; Laboratoire de Physique des Océans, Institut Européen de la Mer, Centre IRD de Bretagne, Plouzané, France; Institute of Marine Sciences, University of California Santa Cruz, Santa Cruz, United States; LSCE/IPSL, CNRS/CEA/UVSQ, Gif sur Yvette, France; National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand; Department of Chemistry, University of Otago, Dunedin, New Zealand; Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, United States; Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, United Kingdom; GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Universidad de Vigo, Vigo, Spain; Institute of Marine Sciences, METU, Mersin, Turkey; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Trieste, Italy; Institut Méditerranéen d'Océanologie (MIO), UMR 7294, Université d'AIX-Marseille-CNRS-IRD, Marseille, France; Israel Oceanographic and Limnological Research (IOLR), National Institute of Oceanography, Haifa, Israel; Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France; Environmental Chemical Processes Laboratory, Dept. of Chemistry, University of Crete, Heraklion, Greece; Helmholtz-Center for Ocean Research Kiel, GEOMAR, Kiel, Germany; Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey; Institut de Ciències del Mar, CMIMA (CSIC), Barcelona, Spain; Department of Global Change Research IMEDEA (CSIC-UIB), Instituto Mediterráneo de Estudios Avanzados, Spain; Department of Ecology and Coastal Management, Andalusian Institute for Marine Science, Campus Universitario Río San Pedro, Puerto Real, Cádiz, Spain; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Recommended Citation:
Guieu C,, Aumont O,, Paytan A,et al. The significance of the episodic nature of atmospheric deposition to Low Nutrient Low Chlorophyll regions[J]. Global Biogeochemical Cycles,2014-01-01,28(11)
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