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Natural variability or anthropogenically-induced variation? Insights from 15 years of multidisciplinary observations at the arctic marine LTER site HAUSGARTEN

descriptionPublicationkeyboard_double_arrow_right Article 01 Jun 2016 Germany Elsevier BVEcological Indicators, volume 65, pages 89-102 (issn: 1470-160X,

Authors: Thomas Soltwedel; Eduard Bauerfeind; Melanie Bergmann; Astrid Bracher; Nataliya Budaeva; Katarzyna Busch; Alexandra Cherkasheva; +13 Authors

doi: 10.1016/j.ecolind.2015.10.001 , 10.34657/3708 , 10.23689/fidgeo-2691

Natural variability or anthropogenically-induced variation? Insights from 15 years of multidisciplinary observations at the arctic marine LTER site HAUSGARTEN

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  (101)
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Abstract

Abstract Time-series studies of arctic marine ecosystems are rare. This is not surprising since polar regions are largely only accessible by means of expensive modern infrastructure and instrumentation. In 1999, the Alfred Wegener Institute, Helmholtz-Centre for Polar and Marine Research (AWI) established the LTER (Long-Term Ecological Research) observatory HAUSGARTEN crossing the Fram Strait at about 79° N. Multidisciplinary investigations covering all parts of the open-ocean ecosystem are carried out at a total of 21 permanent sampling sites in water depths ranging between 250 and 5500 m. From the outset, repeated sampling in the water column and at the deep seafloor during regular expeditions in summer months was complemented by continuous year-round sampling and sensing using autonomous instruments in anchored devices (i.e., moorings and free-falling systems). The central HAUSGARTEN station at 2500 m water depth in the eastern Fram Strait serves as an experimental area for unique biological in situ experiments at the seafloor, simulating various scenarios in changing environmental settings. Long-term ecological research at the HAUSGARTEN observatory revealed a number of interesting temporal trends in numerous biological variables from the pelagic system to the deep seafloor. Contrary to common intuition, the entire ecosystem responded exceptionally fast to environmental changes in the upper water column. Major variations were associated with a Warm-Water-Anomaly evident in surface waters in eastern parts of the Fram Strait between 2005 and 2008. However, even after 15 years of intense time-series work at HAUSGARTEN, we cannot yet predict with complete certainty whether these trends indicate lasting alterations due to anthropologically-induced global environmental changes of the system, or whether they reflect natural variability on multiyear time-scales, for example, in relation to decadal oscillatory atmospheric processes.

Country

Germany

Related Organizations

University of Göttingen
Germany
Helmholtz Association of German Research Centres
Germany
Leibniz Association
Germany
University of Gothenburg
Sweden
Alfred Wegener Institute for Polar and Marine Research
Germany

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Subjects by Vocabulary

Microsoft Academic Graph classification: Water column Observatory Ecology Seafloor spreading Oceanography Deep sea Ecosystem Marine ecosystem Pelagic zone Arctic Environmental science

Keywords

Observatories, HAUSGARTEN; Arctic Ocean; Deep sea; Natural variability; Anthropogenic impact, 551, Anthropogenic impacts, Arctic, Arctic Ocean, research work, Ecology, seafloor, Surface waters, water column, anthropogenic effect, environmental change, Deep sea, observatory, marine ecosystem, Natural variability, sampling, 570, Time series, Anthropogenic impact, General Decision Sciences, Ecosystems, water depth, Ecology, Evolution, Behavior and Systematics, Decision Sciences(all), HAUSGARTEN, polar region, FOS: Biological sciences, Fram Strait

101 references, page 1 of 11

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Bauerfeind, E., Nöthig, E.-M., Beszczynska, A., Fahl, K., Kaleschke, L., Kreker, K., Klages, M., Soltwedel, T., Lorenzen, C., Wegner, J., 2009. Variations in vertical particle flux in the Eastern Fram Strait (79◦ N/4◦ E) during 2000-2005. Results from the Deep-Sea Long-Term Observatory HAUSGARTEN. Deep-Sea Res. I 56, 1471-1487.

Bauerfeind, E., Nöthig, E.-M., Pauls, B., Kraft, A., Beszczynska-Möller, A., 2014. Variability in pteropod sedimentation and corresponding aragonite flux at the Arctic deep-sea long-term observatory HAUSGARTEN in the eastern Fram Strait from 2000 to 2009. J. Mar. Syst. 132, L18501, 95-105, http://dx.doi.org/10.1016/j. jmarsys.2013.12.006.

Belt, S.T., Massé, G., Rowland, S.J., Poulin, M., Michel, C., LeBlanc, B., 2007. A novel chemical fossil of Palaeo sea ice: IP25. Org. Geochem. 38, 16-27.

Bergmann, M., Soltwedel, T., Klages, M., 2011. The interannual variability of megafaunal assemblages in the Arctic deep sea: preliminary results from the HAUSGARTEN observatory (79◦ N). Deep-Sea Res. I 58, 711-723. [OpenAIRE]

Bergmann, M., Klages, M., 2012. Increase of litter at the Arctic deep-sea observatory HAUSGARTEN. Mar. Pollut. Bull. 64 (12), 2734-2741. [OpenAIRE]

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Impact byBIP!

	citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	102
	popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.	Top 1%
	influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	Top 10%
	impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.	Top 1%

	citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	102
	popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.	Top 1%
	influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	Top 10%
	impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.	Top 1%