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Jonsson, Anders
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Publications (10 of 37) Show all publications
Klaus, M., Bergström, A.-K., Jonsson, A., Deininger, A., Geibrink, E. & Karlsson, J. (2018). Weak response of greenhouse gas emissions to whole lake N enrichment. Limnology and Oceanography, 63, S340-S353
Open this publication in new window or tab >>Weak response of greenhouse gas emissions to whole lake N enrichment
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2018 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 63, p. S340-S353Article in journal (Refereed) Published
Abstract [en]

Global warming and land use scenarios suggest increased 21st century nitrogen (N) inputs to aquatic systems. Nitrogen affects in-lake processing and, potentially, atmospheric exchange of greenhouse gases, probably being most relevant in unproductive systems. Here, we test for the first time the effect of a whole-lake experimental increase (threefold) in external nitrate loads on the atmospheric exchange of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) from N-limited unproductive boreal lakes. Nitrate enrichment effects were assessed within a paired Before/After-Control/Impact framework based on 2-hourly to biweekly surface-water sampling of dissolved gas concentrations, and monthly whole-lake inventory surveys, carried out over 4 yrs in six lakes. Nitrate enrichment did not affect gas exchange during summer stratification and whole-lake gas inventories during summer and winter stratification. This finding specifically emphasizes the modest role of internal carbon fixation for the CO2 dynamics of unproductive boreal lakes. A global synthesis of 52 published studies revealed a wide range of nutrient fertilization effects, both in systems similar to our experimental lakes, and other more productive systems. Effects depended mainly on the spatiotemporal scale of the study and became more pronounced when N enrichment was combined with phosphorous. Conclusively, although short-term and habitat-specific effects can occur, changes in N supply have only weak whole-ecosystem effects on greenhouse gas emissions from unproductive boreal lakes.

National Category
Physical Geography
Identifiers
urn:nbn:se:umu:diva-135002 (URN)10.1002/lno.10743 (DOI)000427077300023 ()
Note

Originally included in thesis in manuscript form

Available from: 2017-05-15 Created: 2017-05-15 Last updated: 2018-06-09Bibliographically approved
Rocher-Ros, G., Giesler, R., Lundin, E., Salimi, S., Jonsson, A. & Karlsson, J. (2017). Large lakes dominate CO2 evasion from lakes in an arctic catchment. Geophysical Research Letters, 44(24), 12254-12261
Open this publication in new window or tab >>Large lakes dominate CO2 evasion from lakes in an arctic catchment
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2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 24, p. 12254-12261Article in journal (Refereed) Published
Abstract [en]

CO2 evasion from freshwater lakes is an important component of the carbon cycle. However, the relative contribution from different lake sizes may vary, since several parameters underlying CO2 flux are size dependent. Here we estimated the annual lake CO2 evasion from a catchment in northern Sweden encompassing about 30,000 differently sized lakes. We show that areal CO2 fluxes decreased rapidly with lake size, but this was counteracted by the greater overall coverage of larger lakes. As a result, total efflux increased with lake size and the single largest lake in the catchment dominated the CO2 evasion (53% of all CO2 evaded). By contrast, the contribution from the smallest ponds (about 27,000) was minor (<6%). Our results emphasize the importance of accounting for both CO2 flux rates and areal contribution of various sized lakes in assessments of CO2 evasion at the landscape scale.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2017
National Category
Geophysics Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:umu:diva-144858 (URN)10.1002/2017GL076146 (DOI)000422954700049 ()
Available from: 2018-02-22 Created: 2018-02-22 Last updated: 2018-06-09Bibliographically approved
Myrstener, M., Jonsson, A. & Bergström, A.-K. (2016). The effects of temperature and resource availability on denitrification and relative N2O production in boreal lake sediments. Journal of Environmental Sciences(China), 47, 82-90
Open this publication in new window or tab >>The effects of temperature and resource availability on denitrification and relative N2O production in boreal lake sediments
2016 (English)In: Journal of Environmental Sciences(China), ISSN 1001-0742, E-ISSN 1878-7320, Vol. 47, p. 82-90Article in journal (Refereed) Published
Abstract [en]

Anthropogenic environmental stressors (like atmospheric deposition, land use change, and climate warming) are predicted to increase inorganic nitrogen and organic carbon loading to northern boreal lakes, with potential consequences for denitrification in lakes. However, our ability to predict effects of these changes is currently limited as northern boreal lakes have been largely neglected in denitrification studies. The aim of this study was therefore to assess how maximum potential denitrification and N2O production rates, and the relationship between the two (relative N2O production), is controlled by availability of nitrate (NO3), carbon (C), phosphorus (P), and temperature. Experiments were performed using the acetylene inhibition technique on sediments from a small, nutrient poor boreal lake in northern Sweden in 2014. Maximum potential denitrification and N2O production rates at 4°C were reached already at NO3 additions of 106–120 μg NO3–N/L, and remained unchanged with higher NO3 amendments. Higher incubation temperatures increased maximum potential denitrification and N2O production rates, and Q10 was somewhat higher for N2O production (1.77) than for denitrification (1.69). The relative N2O production ranged between 13% and 64%, and was not related to NO3 concentration, but the ratio increased when incubations were amended with C and P (from a median of 16% to 27%). Combined, our results suggests that unproductive northern boreal lakes currently have low potential for denitrification but are susceptible to small changes in NO3 loading especially if these are accompanied by enhanced C and P availability, likely promoting higher N2O production relative to N2.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Acetylene, NO3, Carbon, DOC, Nitrous oxide ratio, Sediment
National Category
Environmental Sciences
Identifiers
urn:nbn:se:umu:diva-126746 (URN)10.1016/j.jes.2016.03.003 (DOI)000383932200010 ()27593275 (PubMedID)
Available from: 2016-10-19 Created: 2016-10-13 Last updated: 2018-06-09Bibliographically approved
Karlsson, J., Berggren, M., Ask, J., Byström, P., Jonsson, A., Laudon, H. & Jansson, M. (2014). Response to Comment: Terrestrial support of pelagic consumers in unproductive lakes- Uncertainty and potential in assessments using stable isotopes. Limnology and Oceanography, 59(5), 1800-1803
Open this publication in new window or tab >>Response to Comment: Terrestrial support of pelagic consumers in unproductive lakes- Uncertainty and potential in assessments using stable isotopes
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2014 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 59, no 5, p. 1800-1803Article in journal, Editorial material (Refereed) Published
National Category
Environmental Sciences
Identifiers
urn:nbn:se:umu:diva-98410 (URN)10.4319/lo.2014.59.5.1800 (DOI)000345462100027 ()
Available from: 2015-01-22 Created: 2015-01-22 Last updated: 2018-06-07Bibliographically approved
Jansson, M., Berggren, M., Laudon, H. & Jonsson, A. (2012). Bioavailable phosphorus in humic headwater streams in boreal Sweden. Limnology and Oceanography, 57(4), 1161-1170
Open this publication in new window or tab >>Bioavailable phosphorus in humic headwater streams in boreal Sweden
2012 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 57, no 4, p. 1161-1170Article in journal (Refereed) Published
Abstract [en]

Bioavailable phosphorus (BAP) concentrations were determined nine times between April and October 2010 in two humic boreal headwater streams draining forest-and mire-dominated catchments. BAP was analyzed in a bioassay in which natural P-limited bacterioplankton grew with natural P as the sole P source. In both streams, approximately 90% of the BAP occurred as dissolved species (passing a 0.2-mu m filter), consisting partly of low-molecular-weight forms (passing a filter with nominal cutoff at 1 kDa) and partly of high-molecular-weight forms (passing a 0.2-mu m filter but not a 1-kDa filter). Concentrations of total dissolved BAP varied between 1 mu g L-1 and 14 mu g L-1, with the highest values in the middle of the summer. Compared to the forest stream, BAP concentrations were generally higher in the mire stream, where it occasionally amounted to nearly 50% of total P. Molybdate reactive phosphorus overestimated BAP considerably. Most of the BAP was in forms other than free orthophosphate. Temporal BAP variations showed no relationships with dissolved organic carbon (C) or iron but were positively related to air temperature and negatively related to the absorbance ratio (a254 : a365) of organic compounds in the water, indicating connections between terrestrial export of BAP and temperature-dependent terrestrial C metabolism. Concentrations of BAP can relieve stream bacteria from P limitation, and a significant share of BAP exported to streams can reach and be used in downstream lakes.

National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-59734 (URN)10.4319/lo.2012.57.4.1161 (DOI)000307269300021 ()
Available from: 2012-10-18 Created: 2012-09-25 Last updated: 2018-06-08Bibliographically approved
Jansson, M., Karlsson, J. & Jonsson, A. (2012). Carbon dioxide supersaturation promotes primary production in lakes [Letter to the editor]. Ecology Letters, 15(6), 527-532
Open this publication in new window or tab >>Carbon dioxide supersaturation promotes primary production in lakes
2012 (English)In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 15, no 6, p. 527-532Article in journal, Letter (Refereed) Published
Abstract [en]

Ecology Letters (2012) Abstract A majority of the worlds lakes are supersaturated with respect to carbon dioxide (CO2). By experimental manipulation of the CO2 concentration in supersaturated boreal lakes, we demonstrate that phytoplankton primary production was up to 10 times higher in supersaturated lake water in comparison with water with CO2 at equilibrium concentrations and that CO2, together with nutrients, explained most of the variation in pelagic primary production and phytoplankton biomass over a wide variety of unproductive lakes. These results suggest that phytoplankton can be co-limited by CO2 and nutrients in unproductive lakes. As import of terrestrial organic carbon and its subsequent microbial mineralisation in lakes is a driving force of CO2-supersaturation our results suggest that lake productivity and carbon cycling may respond to variations in terrestrial organic carbon export, (e.g. caused by land use or climate change) in ways not described before.

Keywords
CO2-supersaturation, lake ecosystems, primary production
National Category
Earth and Related Environmental Sciences Ecology
Identifiers
urn:nbn:se:umu:diva-56202 (URN)10.1111/j.1461-0248.2012.01762.x (DOI)000303666200003 ()
Available from: 2012-06-12 Created: 2012-06-12 Last updated: 2018-06-08Bibliographically approved
Karlsson, J., Berggren, M., Ask, J., Byström, P., Jonsson, A., Laudon, H. & Jansson, M. (2012). Terrestrial organic matter support of lake food webs: Evidence from lake metabolism and stable hydrogen isotopes of consumers. Limnology and Oceanography, 57(4), 1042-1048
Open this publication in new window or tab >>Terrestrial organic matter support of lake food webs: Evidence from lake metabolism and stable hydrogen isotopes of consumers
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2012 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 57, no 4, p. 1042-1048Article in journal (Refereed) Published
Abstract [en]

We quantified the utilization of terrestrial organic matter (OM) in the food web of a humic lake by analyzing the metabolism and the consumers' stable isotopic (C, H, N) composition in benthic and pelagic habitats. Terrestrial OM inputs (3 g C m(-2) d(-1)) to the lake greatly exceeded autochthonous OM production (3 mg C m(-2) d(-1)) in the lake. Heterotrophic bacterial growth (19 mg C m(-2) d(-1)) and community respiration (115 mg C m(-2) d(-1)) were high relative to algal photosynthesis and were predominantly (> 85%) supported by terrestrial OM in both habitats. Consequently, terrestrial OM fueled most (85%) of the total production at the base of the lake's food web (i.e., the sum of primary and bacterial production). Despite the uncertainties of quantitatively estimating resource use based on stable isotopes, terrestrial OM clearly also supported around half the zooplankton (47%), macrozoobenthos (63%), and fish (57%) biomass. These results indicate that, although rates of terrestrial OM inputs were around three orders of magnitude greater than that of autochthonous OM production, the use of the two resources by higher trophic levels was roughly equal. The disproportionally low reliance on terrestrial OM at higher trophic levels, compared with its high rates of input and high support of basic biomass production in the lake, suggests that autochthonous resources could not be completely replaced by terrestrial resources and indicates an upper limit to terrestrial support of lake food webs.

National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-59733 (URN)10.4319/lo.2012.57.4.1042 (DOI)000307269300011 ()
Available from: 2012-10-18 Created: 2012-09-25 Last updated: 2018-06-08Bibliographically approved
Jansson, M., Jonsson, A., Andersson, A. & Karlsson, J. (2010). Biomass and structure of planktonic communities along an air temperature gradient in subarctic Sweden. Freshwater Biology, 55(3), 691-700
Open this publication in new window or tab >>Biomass and structure of planktonic communities along an air temperature gradient in subarctic Sweden
2010 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 55, no 3, p. 691-700Article in journal (Refereed) Published
Abstract [en]

1. Air temperature will probably have pronounced effects on the composition of plankton communities in northern lake ecosystems, either via indirect effects on the export of essential elements from catchments or through direct effects of water temperature and the ice-free period on the behaviour of planktonic organisms.

2. We assessed the role of temperature by comparing planktonic communities in 15 lakes along a 6 °C air temperature gradient in subarctic Sweden.

3. We found that the biomass of phytoplankton, bacterioplankton and the total planktonic biomass were positively related to air temperature, probably as a result of climatic controls on the export of nitrogen from the catchment (which affects phytoplankton biomass) and dissolved organic carbon (affecting bacterioplankton biomass).

4. The structure of the zooplankton community, and top down effects on phytoplankton, were apparently not related to temperature but mainly to trophic interactions ultimately dependent on the presence of fish in the lakes.

5. Our results suggest that air temperature regimes and long-term warming can have strong effects on the planktonic biomass in high latitude lakes. Effects of temperature on the structure of the planktonic community might be less evident unless warming permits the invasion of fish into previous fishless lakes.

Keywords
ecosystem, fish, lakes, phytoplankton, zooplankton
National Category
Biological Sciences
Identifiers
urn:nbn:se:umu:diva-31935 (URN)10.1111/j.1365-2427.2009.02310.x (DOI)000274814100015 ()
Available from: 2010-02-24 Created: 2010-02-24 Last updated: 2018-06-08Bibliographically approved
MacIntyre, S., Jonsson, A., Jansson, M., Åberg, J., Turney, D. E. & Miller, S. D. (2010). Buoyancy flux, turbulence, and the gas transfer coefficient in a stratified lake. Geophysical Research Letters, 37(L24604)
Open this publication in new window or tab >>Buoyancy flux, turbulence, and the gas transfer coefficient in a stratified lake
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2010 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 37, no L24604Article in journal (Refereed) Published
Abstract [en]

Gas fluxes from lakes and other stratified water bodies, computed using conservative values of the gas transfer coefficient k600, have been shown to be a significant component of the carbon cycle. We present a mechanistic analysis of the dominant physical processes modifying k600 in a stratified lake and resulting new models of k600 whose use will enable improved computation of carbon fluxes. Using eddy covariance results, we demonstrate that i) higher values of k600 occur during low to moderate winds with surface cooling than with surface heating; ii) under overnight low wind conditions k600 depends on buoyancy flux β rather than wind speed; iii) the meteorological conditions at the time of measurement and the inertia within the lake determine k600; and iv) eddy covariance estimates of k600 compare well with predictions of k600 using a surface renewal model based on wind speed and β.

Identifiers
urn:nbn:se:umu:diva-38928 (URN)10.1029/2010GL044164 (DOI)000285638900001 ()
Available from: 2011-01-11 Created: 2011-01-11 Last updated: 2018-06-08Bibliographically approved
Åberg, J., Jansson, M. & Jonsson, A. (2010). Importance of water temperature and thermal stratification dynamics for temporal variation of surface water CO2 in a boreal lake. Journal of Geophysical Research, 115(G02024), 10PP
Open this publication in new window or tab >>Importance of water temperature and thermal stratification dynamics for temporal variation of surface water CO2 in a boreal lake
2010 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 115, no G02024, p. 10PP-Article in journal (Refereed) Published
Abstract [en]

Variation of the surface water CO2 concentration is likely to be the result of biological activity and physical processes as water mixing and gas exchange with the atmosphere. Here we have studied the variations in surface water CO2 during the ice-free period in the humic Lake Merasjärvi in northern Sweden. Meteorological, hydrological and limnological data were collected using data logging equipment permitting high time-resolution. The surface water of the lake was supersaturated with respect to CO2 throughout the study period. There were, however, considerable diurnal and longer-term temporal variations of the surface water CO2 concentrations. Partial least squares (PLS) models were used to link the logged CO2 data to the multivariate dataset. On the longer-term time scale (analyzed with 24h means of the logged data) high concentrations of surface water CO2 were best related to the depth and temperature of the upper warmer layer (epilimnion), and to erosion of the underlying colder layer (hypolimnion). The diurnal variation (analyzed with 30 minute means of the logged data) was best related to the thermal dynamics within the epilimnion, which regulated the surface water access to CO2 stores within this layer. Variables related to CO2 emission and photosynthesis (wind and PAR), showed only weak correlations to variations of the surface water CO2 concentration. Accordingly, the CO2 flux, measured with the eddy-covariance technique, was not correlated to the surface water CO2 concentration.

Keywords
lake, carbon dioxide, PLS, thermal stratification, boreal
National Category
Earth and Related Environmental Sciences
Research subject
Physical Geography
Identifiers
urn:nbn:se:umu:diva-26965 (URN)10.1029/2009JG001085 (DOI)000279310300001 ()
Available from: 2009-11-04 Created: 2009-11-04 Last updated: 2018-06-08Bibliographically approved
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