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Renberg, Ingemar
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Publications (10 of 49) Show all publications
Maier, D. B., Gälman, V., Renberg, I. & Bigler, C. (2018). Using a decadal diatom sediment trap record to unravel seasonal processes important for the formation of the sedimentary diatom signal. Journal of Paleolimnology, 60(2), 133-152
Open this publication in new window or tab >>Using a decadal diatom sediment trap record to unravel seasonal processes important for the formation of the sedimentary diatom signal
2018 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 60, no 2, p. 133-152Article in journal (Refereed) Published
Abstract [en]

Sediment trap studies and high frequency monitoring are of great importance to develop a deeper understanding of how seasonal environmental processes are imprinted in sediment signal formation. We collected whole year diatom assemblages from 2002 to 2014 with a sequential sediment trap from a varved boreal lake (Nylandssjon, Sweden) together with environmental and limnological parameters, and compared them with the corresponding diatom record of the annual laminated sediment. Our data set indicates a large year-to-year variability of diatom succession and abundance patterns, which is well reflected in the varved sediments. Specifically, Cyclotella glomerata dominated the annual sediment trap record (as well as in the corresponding sediment varves) in years with warmer air temperatures in March/April, and Asterionella formosa dominated the annual sediment assemblages as a consequence of years characterized by higher runoff before lake over-turn. Years succeeding forest clearance in the lake catchment showed marked increase in diatom and sediment flux. The DCA scores of the yearly diatom trap assemblages clearly resemble the lake's thermal structure, which indicates that the relative abundance of major taxa seems primarily controlled by the timing of seasonal environmental events, such as above-average winter air temperature and/or autumn runoff and the current thermal structure of the lake. The high seasonal variability between environmental drivers in combination with the physical limnology leaves us with several possible scenarios leading to either an A. formosa versus C. glomerata dominated annual diatom sediment signal. With this study we highlight that short-term environmental events and seasonal limnological conditions are of major importance for interpreting annual sediment signals.

Place, publisher, year, edition, pages
Springer, 2018
Keywords
Annual diatom flux, Sequential sediment trap, Varved lake sediments, Seasonal air temperature, Discharge, Catchment
National Category
Geology Ecology
Identifiers
urn:nbn:se:umu:diva-150660 (URN)10.1007/s10933-018-0020-5 (DOI)000437128400003 ()2-s2.0-85042094692 (Scopus ID)
Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2020-02-03Bibliographically approved
Arnqvist, P., Bigler, C., Renberg, I. & Sjöstedt de Luna, S. (2016). Functional clustering of varved lake sediment to reconstruct past seasonal climate. Environmental and Ecological Statistics, 23(4), 513-529
Open this publication in new window or tab >>Functional clustering of varved lake sediment to reconstruct past seasonal climate
2016 (English)In: Environmental and Ecological Statistics, ISSN 1352-8505, E-ISSN 1573-3009, Vol. 23, no 4, p. 513-529Article in journal (Refereed) Published
Abstract [en]

Annually laminated (varved) lake sediments constitutes excellent environmental archives, and have the potential to play an important role for understanding past seasonal climate with their inherent annual time resolution and within-year seasonal patterns. We propose to use functional data analysis methods to extract the relevant information with respect to climate reconstruction from the rich but complex information in the varves, including the shapes of the seasonal patterns, the varying varve thickness, and the non-linear sediment accumulation rates. In particular we analyze varved sediment from lake Kassjon in northern Sweden, covering the past 6400 years. The properties of each varve reflect to a large extent weather conditions and internal biological processes in the lake the year that the varve was deposited. Functional clustering is used to group the seasonal patterns into different types, that can be associated with different weather conditions. The seasonal patterns were described by penalized splines and clustered by the k-means algorithm, after alignment. The observed (within-year) variability in the data was used to determine the degree of smoothing for the penalized spline approximations. The resulting clusters and their time dynamics show great potential for seasonal climate interpretation, in particular for winter climate changes.

Place, publisher, year, edition, pages
Springer, 2016
Keywords
Climate, Clustering, Curve registration, Functional data analysis, Penalized least squares, Varved lake diment
National Category
Probability Theory and Statistics Environmental Sciences
Identifiers
urn:nbn:se:umu:diva-130095 (URN)10.1007/s10651-016-0351-1 (DOI)000387424200002 ()2-s2.0-84978663468 (Scopus ID)
Available from: 2017-01-13 Created: 2017-01-11 Last updated: 2023-03-24Bibliographically approved
Renberg, I. (2014). A short summary of my forty years in paleolimnology. Journal of Paleolimnology, 51(1), 145-153
Open this publication in new window or tab >>A short summary of my forty years in paleolimnology
2014 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 51, no 1, p. 145-153Article in journal (Refereed) Published
National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-86847 (URN)10.1007/s10933-013-9698-6 (DOI)000330590900011 ()2-s2.0-84892843939 (Scopus ID)
Available from: 2014-03-13 Created: 2014-03-11 Last updated: 2023-03-23Bibliographically approved
Maier, D. B., Rydberg, J., Bigler, C. & Renberg, I. (2013). Compaction of recent varved lake sediments. GFF, 135(3-4), 231-236
Open this publication in new window or tab >>Compaction of recent varved lake sediments
2013 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 135, no 3-4, p. 231-236Article in journal (Refereed) Published
Abstract [en]

To assess the rates of compaction in recent, varved (annually laminated) lake sediments, we used a collection of 13 freeze cores sampled from 1979 to 2012 in Nylandssjon (northern Sweden). This unique series of stored freeze cores allowed us to measure how the thickness of individual varves changed when they were overlain by new varves. The compaction rate was greatest during the first few years after deposition; varve thickness decreased by 60% after 5 years (sediment depth 5cm). Thereafter, the compaction rate declined, but after 33 years (the study period) there was still a weak trend of continued compaction (sediment depth 12cm). The rate of compaction is clearly linked to loss of water along with an increase in dry-bulk density of the sediment. Despite compaction causing considerable varve thickness changes over time, the year-to-year variation in varve thickness is preserved while sediment ages. Understanding compaction processes is of fundamental importance to paleolimnology, for example in studies involving calibration of varve thicknesses of recent varves against environmental parameters.

Place, publisher, year, edition, pages
Taylor & Francis, 2013
Keywords
varved lake sediment, compaction, varve thickness, bulk density, diagenesis, post-depositional changes, paleolimnology
National Category
Geology
Identifiers
urn:nbn:se:umu:diva-85095 (URN)10.1080/11035897.2013.788551 (DOI)000327571800002 ()2-s2.0-84889583158 (Scopus ID)
Note

Special Issue: Varve Genesis, Chronology and Paleoclimate

Available from: 2014-01-28 Created: 2014-01-28 Last updated: 2023-03-24Bibliographically approved
Catalan, J., Pla-Rabes, S., Wolfe, A. P., Smol, J. P., Ruehland, K. M., Anderson, N. J., . . . Renberg, I. (2013). Global change revealed by palaeolimnological records from remote lakes: a review. Journal of Paleolimnology, 49(3), 513-535
Open this publication in new window or tab >>Global change revealed by palaeolimnological records from remote lakes: a review
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2013 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 49, no 3, p. 513-535Article in journal (Refereed) Published
Abstract [en]

Over recent decades, palaeolimnological records from remote sites have provided convincing evidence for the onset and development of several facets of global environmental change. Remote lakes, defined here as those occurring in high latitude or high altitude regions, have the advantage of not being overprinted by local anthropogenic processes. As such, many of these sites record broad-scale environmental changes, frequently driven by regime shifts in the Earth system. Here, we review a selection of studies from North America and Europe and discuss their broader implications. The history of investigation has evolved synchronously with the scope and awareness of environmental problems. An initial focus on acid deposition switched to metal and other types of pollutants, then climate change and eventually to atmospheric deposition-fertilising effects. However, none of these topics is independent of the other, and all of them affect ecosystem function and biodiversity in profound ways. Currently, remote lake palaeolimnology is developing unique datasets for each region investigated that benchmark current trends with respect to past, purely natural variability in lake systems. Fostering conceptual and methodological bridges with other environmental disciplines will upturn contribution of remote lake palaeolimnology in solving existing and emerging questions in global change science and planetary stewardship.

Place, publisher, year, edition, pages
Springer Netherlands, 2013
Keywords
Remote lake palaeolimnology, Climate change, Nitrogen cascade, Acidification, Long-range atmospheric pollution, Arctic lakes, Alpine lakes, High latitude, High altitude
National Category
Earth and Related Environmental Sciences Ecology
Identifiers
urn:nbn:se:umu:diva-70355 (URN)10.1007/s10933-013-9681-2 (DOI)000316886900014 ()2-s2.0-84875590771 (Scopus ID)
Available from: 2013-05-14 Created: 2013-05-14 Last updated: 2023-03-24Bibliographically approved
Klaminder, J., Appleby, P., Crook, P. & Renberg, I. (2012). Post-deposition diffusion of 137Cs in lake sediment: implications for radiocaesium dating. Sedimentology, 59(7), 2259-2267
Open this publication in new window or tab >>Post-deposition diffusion of 137Cs in lake sediment: implications for radiocaesium dating
2012 (English)In: Sedimentology, ISSN 0037-0746, E-ISSN 1365-3091, Vol. 59, no 7, p. 2259-2267Article in journal (Refereed) Published
Abstract [en]

Peak activities of radiocaesium (137Cs) in lake sediments have frequently been used to infer the ages of sediments deposited in the 1960s (137Cs derived from nuclear bomb testing) or in 1986 (Chernobyl derived 137Cs). Records of the vertical distribution of 137Cs in sediments can thus be used to provide accurate dates for a critical period in which palaeoecological reconstructions often overlap contemporary monitoring data. However, knowledge regarding how the distribution of 137Cs in sediments is affected by post-depositional processes is limited to interpretations based on the 137Cs distribution in sediments sampled at a single given date. This study assesses the extent to which the 137Cs record in annually laminated (varved) lake sediments is affected by post-depositional diffusion, using 11 archived sediment cores sampled between 1986 and 2007. The sediment record reveals how Chernobyl 137Cs incorporated into the 1986 varve diffused downwards in the core at a decreasing rate over time, whereas the surface sediments continued to receive inputs of 137Cs mobilized from the catchment soils or lake margin. In spite of these processes, all cores post-dating the Chernobyl accident had a clear and well-resolved peak in the 1986 varve, justifying the use of this feature as a fixed chronostratigraphic feature. Because of the very high levels of Chernobyl fallout at this site, downwards migration of Chernobyl 137Cs has, however, completely masked the nuclear weapons 137Cs fallout peak that had been clearly preserved in the 1964 varve of a pre-Chernobyl core sampled just three weeks before the Chernobyl accident. In consequence, the weapons fallout marker is likely to be of little use for determining 137Cs dates in areas strongly affected by high levels of Chernobyl fallout.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2012
Keywords
137Cs, dating, diffusion, Sweden, varved sediment
National Category
Geology
Identifiers
urn:nbn:se:umu:diva-104243 (URN)10.1111/j.1365-3091.2012.01343.x (DOI)000311403500012 ()2-s2.0-84870255897 (Scopus ID)
Available from: 2015-06-11 Created: 2015-06-09 Last updated: 2023-03-24Bibliographically approved
Renberg, I. & Hansson, H. (2011). A tripod piston corer for taking a meter-long sediment core with an undisturbed sediment-water interface. Journal of Paleolimnology, 46(2), 313-317
Open this publication in new window or tab >>A tripod piston corer for taking a meter-long sediment core with an undisturbed sediment-water interface
2011 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 46, no 2, p. 313-317Article in journal, Editorial material (Other academic) Published
Abstract [en]

We present a design for a piston corer that can take a sediment core up to 1 m long, with an undisturbed sediment-water interface. The coring device possesses a tripod unit and a core-tube unit, the latter comprised of a core tube, a piston with a wire, a drive weight in which the core tube is mounted and a steel rod. The tripod stands on the sediment surface during coring, stabilizing the system and serving as an anchor point for the piston wire. A ball clamp, the critical component of the design, is mounted on top of the tripod. The steel rod runs through the ball clamp and at its lower end, holds the drive weight and the core tube. The ball clamp allows the core tube to slide downward, while the piston is held in a fixed vertical position by the wire connected to the tripod. When the corer is lifted, however, the ball clamp locks. This makes it possible to operate the corer with a single cable, because the piston is not subject to any lifting force when the corer is retrieved. The piston remains in position in the core tube even if the collected sediment core is very short. The piston corer can be deployed from a raft or a boat. 

Place, publisher, year, edition, pages
Springer, 2011
Keywords
Coring system for soft sediments, Long cores, Piston corer, Sediment corer, Undisturbed sediment-water interface
National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-217424 (URN)10.1007/s10933-011-9542-9 (DOI)2-s2.0-79960722739 (Scopus ID)
Available from: 2023-12-05 Created: 2023-12-05 Last updated: 2023-12-05Bibliographically approved
Bindler, R., Segerström, U., Pettersson-Jensen, I.-M., Berg, A., Hansson, S., Holmström, H., . . . Renberg, I. (2011). Early medieval origins of iron mining and settlement in central Sweden: multiproxy analysis of sediment and peat records from the Norberg mining district. Journal of Archaeological Science, 38(2), 291-300
Open this publication in new window or tab >>Early medieval origins of iron mining and settlement in central Sweden: multiproxy analysis of sediment and peat records from the Norberg mining district
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2011 (English)In: Journal of Archaeological Science, ISSN 0305-4403, E-ISSN 1095-9238, Vol. 38, no 2, p. 291-300Article in journal (Refereed) Published
Abstract [en]

The historical Norberg mining district in central Sweden with its shallow, easily accessible iron ores figures prominently in the earliest documents from the 14th century concerning mining or metallurgy. This 1000-km2 district is considered to be one of the first areas in Sweden exploited for iron ores and, in fact, Europe’s oldest known blast furnace, Lapphyttan, is located in the Norberg district about 10 km from the mines in the village of Norberg (Norbergsby). Earlier archaeological excavations suggest the furnace was in operation as early as the 11th or 12th century (870 and 930 14C yr BP), and a number of other sites in the district have been dated to the 13th–15th centuries. Here, we have analyzed two lake sediment records (Kalven and Noren) from the village of Norberg and a peat record from Lapphyttan. The Lapphyttan peat record was radiocarbon dated, whereas the sediment from Kalven is annually laminated, which provides a fairly precise chronology. Our pollen data indicate that land use in the area began gradually as forest grazing by at least c. AD 1050, with indications of more widespread forest disturbance and cultivation from c. 1180 at Lapphyttan and 1250 at Kalven. Based on 206Pb/207Pb isotope ratios in Kalven’s varved sediment record, there is an indication of mining or metallurgy in the area c. 960, but likely not in immediate connection to our sites. Evidence of mining and metallurgy increases gradually from c. 1180 when there is a decline in 206Pb/207Pb ratios and an increase in charcoal particles at Lapphyttan, followed by increasing inputs of lithogenic elements in Noren’s sediment record indicating soil disturbance, which we attribute to the onset of mining the iron ore bodies surrounding Noren. From AD 1295 onwards evidence of mining and metallurgy are ubiquitous, and activities accelerate especially during the late 15th century; the maximum influence of Bergslagen ore lead (i.e., the minimum in 206Pb/207Pb isotope ratios) in both Kalven and Noren occurs c. 1490–1500, when also varve properties change in Kalven and in Noren sharp increases occur in the concentrations of a range of other ore-related metals (e.g., arsenic, cadmium, copper, iron, lead, mercury and zinc). From the 15th century onwards mining and metallurgy are the dominant feature of the sediment records.

Keywords
Iron mining, lake sediment, peat, geochemistry, pollen
Identifiers
urn:nbn:se:umu:diva-38214 (URN)10.1016/j.jas.2010.09.004 (DOI)2-s2.0-78649510277 (Scopus ID)
Available from: 2010-11-30 Created: 2010-11-30 Last updated: 2023-03-23Bibliographically approved
Bindler, R., Rydberg, J. & Renberg, I. (2011). Establishing natural sediment reference conditions for metals and the legacy of long-range and local pollution on lakes in Europe. Journal of Paleolimnology, 45(4), 519-531
Open this publication in new window or tab >>Establishing natural sediment reference conditions for metals and the legacy of long-range and local pollution on lakes in Europe
2011 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 45, no 4, p. 519-531Article in journal (Refereed) Published
Abstract [en]

The intention of the European Water Framework Directive (WFD) and the national guidelines that implement the WFD is that present-day conditions and future management strategies are to be based on an understanding of reference conditions for the particular water body of interest. In the context of non-synthetic pollutants such as lead, mercury and cadmium, the criteria for a high ecological status are that "concentrations [are] within the range normally associated with undisturbed conditions". How this normal range is to be defined is open to interpretation; for example, in Sweden reference conditions based on sediment records are defined as the conditions prior to modern industrialization, i.e. prior to the mid-1800's. These pre-industrial reference conditions would correspond to sediments 15-30 cm depth. However, 'reference conditions' are not always synonymous with 'natural background conditions'. Analyses of long sediment profiles from Swedish lakes and from a few other areas, however, have shown that pre-industrial pollution-at least with regard to lead-was extensive. Atmospheric lead pollution has its origin in antiquity, with a small, well-defined peak already during the Greek-Roman period 2,000 years ago. Sediments deposited 300-500 years in Sweden and Scotland, for example, show a dominance of pollution lead, and in some sediment records also cadmium and copper pollution was extensive. Thus, in order to characterize natural background concentrations of metals, long sediment profiles are needed to reach sediments unaffected by pollution (> 3,000 years BP); this can correspond to sediments below 50 cm in some lakes, but in others sediments below 300 cm or more.

Place, publisher, year, edition, pages
Dordrecht: Springer, 2011
Keywords
Cadmium, Lead, Mercury, Metal pollution, Reference conditions
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:umu:diva-52209 (URN)10.1007/s10933-010-9425-5 (DOI)000290043900009 ()2-s2.0-79955521966 (Scopus ID)
Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2023-03-24Bibliographically approved
Boes, X., Rydberg, J., Martinez-Cortizas, A., Bindler, R. & Renberg, I. (2011). Evaluation of conservative lithogenic elements (Ti, Zr, Al, and Rb) to study anthropogenic element enrichments in lake sediments. Journal of Paleolimnology, 46(1), 75-87
Open this publication in new window or tab >>Evaluation of conservative lithogenic elements (Ti, Zr, Al, and Rb) to study anthropogenic element enrichments in lake sediments
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2011 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 46, no 1, p. 75-87Article in journal (Refereed) Published
Abstract [en]

In lake sediment investigations of heavy metal pollution history, it has become a common approach to calculate enrichment factors (EFs) by normalizing elemental distributions to a reference lithogenic element. However, this approach requires that the reference element remains stable once it has been deposited to the sediment (it is not affected by diagenetic processes). This is rarely studied in well-controlled field experiments. Here, we test the commonly used reference elements titanium (Ti), zirconium (Zr), aluminum (Al), and rubidium (Rb). We use a unique series of freeze cores collected in different years since 1979 in Lake Nylandssjon in northern Sweden. This lake has sediment with distinct varves (annually laminated deposit). Element concentrations in individual varves were analyzed using X-ray fluorescence (XRF) spectroscopy. By tracking the newly formed surface varve from different cores across this core series, i.e., following the element concentration in a specific varve as it becomes progressively aged, it was possible to assess the potential impact of diagenetic processes on geochemical signatures. Results confirm the conservative character of the studied elements; there was neither an increasing nor a decreasing concentration trend with time during sediment ageing for any of these elements. Secondly, we addressed the question 'which of them is the most appropriate for EFs estimates with the aim of distinguishing anthropogenic from geogenic inputs, for example in pollution studies'. To assess the reliability of the EFs we used lead (Pb) as an example, because anthropogenic Pb in the sediment could be independently calculated using stable Pb isotopes. When anthropogenic Pb concentrations calculated with Pb-EFs were compared to the anthropogenic Pb concentrations derived from stable Pb isotopes, the differences found were 20% for Ti, 10% for Zr, 11% for Al, and 27% for Rb when upper continental crust concentrations were used for the background ratio. Based on the results from Nylandssjon our suggestions are that (1) when using EFs on a single core, which is the normal case in paleolimnology, multiple reference elements should be used together and (2) the results from those should be critically evaluated.

Place, publisher, year, edition, pages
Dordrecht: Springer, 2011
Keywords
Sediment geochemistry, Sedimentology, Diagenesis, Paleoenvironment, Pollution, Enrichment factor (EF), Varved sediments
National Category
Earth and Related Environmental Sciences Biological Sciences
Identifiers
urn:nbn:se:umu:diva-52208 (URN)10.1007/s10933-011-9515-z (DOI)000293144700006 ()2-s2.0-79957928559 (Scopus ID)
Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2023-03-24Bibliographically approved
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