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Holby, Ola
Publications (10 of 24) Show all publications
Anderson, L. G., Björk, G., Holby, O., Jutterstrom, S., Morth, C. M., O'Regan, M., . . . Jakobsson, M. (2017). Shelf-Basin interaction along the East Siberian Sea. Ocean Science, 13(2), 349-363
Open this publication in new window or tab >>Shelf-Basin interaction along the East Siberian Sea
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2017 (English)In: Ocean Science, ISSN 1812-0784, E-ISSN 1812-0792, Vol. 13, no 2, p. 349-363Article in journal (Refereed) Published
Abstract [en]

Extensive biogeochemical transformation of organic matter takes place in the shallow continental shelf seas of Siberia. This, in combination with brine production from sea-ice formation, results in cold bottom waters with relatively high salinity and nutrient concentrations, as well as low oxygen and pH levels. Data from the SWERUS-C3 expedition with icebreaker Oden, from July to September 2014, show the distribution of such nutrient-rich, cold bottom waters along the continental margin from about 140 to 180 degrees E. The water with maximum nutrient concentration, classically named the upper halocline, is absent over the Lomonosov Ridge at 140 degrees E, while it appears in the Makarov Basin at 150 degrees E and intensifies further eastwards. At the intercept between the Mendeleev Ridge and the East Siberian continental shelf slope, the nutrient maximum is still intense, but distributed across a larger depth interval. The nutrient-rich water is found here at salinities of up to similar to 34.5, i.e. in the water classically named lower halocline. East of 170 degrees E transient tracers show significantly less ventilated waters below about 150 m water depth. This likely results from a local isolation of waters over the Chukchi Abyssal Plain as the boundary current from the west is steered away from this area by the bathymetry of the Mendeleev Ridge. The water with salinities of similar to 34.5 has high nutrients and low oxygen concentrations as well as low pH, typically indicating decay of organic matter. A deficit in nitrate relative to phosphate suggests that this process partly occurs under hypoxia. We conclude that the high nutrient water with salinity similar to 34.5 are formed on the shelf slope in the Mendeleev Ridge region from interior basin water that is trapped for enough time to attain its signature through interaction with the sediment.

Place, publisher, year, edition, pages
Copernicus MBH, 2017
National Category
Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:kau:diva-65519 (URN)10.5194/os-13-349-2017 (DOI)000400167800001 ()
Available from: 2018-01-04 Created: 2018-01-04 Last updated: 2018-06-27Bibliographically approved
Holby, O., Sachs, O., Sauter, E. J., Schlueter, M., Rutgers van der Loeff, M. M. & Jerosch, K. (2009). Benthic organic carbon flux and oxygen penetration reflect different plankton provinces in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 56(8), 1319-1335
Open this publication in new window or tab >>Benthic organic carbon flux and oxygen penetration reflect different plankton provinces in the Southern Ocean
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2009 (English)In: Deep Sea Research Part I: Oceanographic Research Papers, ISSN 0967-0637, E-ISSN 1879-0119, Vol. 56, no 8, p. 1319-1335Article in journal (Refereed)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-9789 (URN)
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2017-12-07Bibliographically approved
Stoica, A., Sandberg, M. & Holby, O. (2009). Energy Use and Recovery Strategies within Wastewater Treatment and Sludge Handling at Pulp and Paper Mills. Bioresource Technology, 100(14), 3497-3505
Open this publication in new window or tab >>Energy Use and Recovery Strategies within Wastewater Treatment and Sludge Handling at Pulp and Paper Mills
2009 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 100, no 14, p. 3497-3505Article in journal (Refereed) Published
Abstract [en]

This paper presents an inclusive approach with focus on energy use and recovery in wastewater management, including wastewater treatment (WWT) and sludge handling. Process data from three Swedish mills and a mathematical model were used to evaluate seven sludge handling strategies. The results indicate that excess energy use in WWT processes counters the potential energy recovery in the sludge handling systems. Energy use in WWT processes is recommended to aim for sufficient effluent treatment, not for sludge reduction. Increased secondary sludge production is favourable from an energy point of view provided it is used as a substrate for heat, biogas or electricity production.

Keywords
Pulp and paper mills; wastewater treatment; sludge handling; bioenergy; sustainability.
National Category
Other Mechanical Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-3850 (URN)10.1016/j.biortech.2009.02.041 (DOI)
Available from: 2009-03-25 Created: 2009-03-25 Last updated: 2017-12-13Bibliographically approved
Sandberg, M. & Holby, O. (2008). Black liquor and alkaline shocks in a multiple stage Biological tratment plant. J. Environ. Eng. Sci. 7(4):335-344
Open this publication in new window or tab >>Black liquor and alkaline shocks in a multiple stage Biological tratment plant
2008 (English)In: J. Environ. Eng. Sci. 7(4):335-344Article in journal (Refereed)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-17431 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Sandberg, M. & Holby, O. (2008). Black Liquor and Alkaline Shocks in a Multiple Stage Biological Treatment Plant. Journal of Environmental Engineering and Science, 7(4), 335-344
Open this publication in new window or tab >>Black Liquor and Alkaline Shocks in a Multiple Stage Biological Treatment Plant
2008 (English)In: Journal of Environmental Engineering and Science, ISSN 1496-2551, E-ISSN 1496-256X, Vol. 7, no 4, p. 335-344Article in journal (Refereed) Published
Abstract [en]

To find the impact that alkaline and black liquor spills have on multiple stage biological treatment plants, trials were made in a MultiBio lab-scale treatment plant. It was shown that the concentration of black liquor was diluted between the multiple stages. The initial bacterial stages were inhibited by high concentration of black liquor but recovered when the concentration decreased. Low pH in the feed contaminated with black liquor gave less inhibition than high pH. In a MultiBio treatment plant the active sludge stages, which are sensitive to toxic spills, are placed after the fast growing bacterial stages and are therefore protected. During normal conditions the activated sludge stages receive low concentrations of biodegradable COD. During the trials extra COD in the form of diluted black liquor induced the COD reduction. To evaluate the results, measured concentrations were compared with a computer model.

National Category
Energy Systems
Research subject
Energy Technology
Identifiers
urn:nbn:se:kau:diva-1985 (URN)10.1139/S08-007 (DOI)
Available from: 2008-02-11 Created: 2008-02-11 Last updated: 2017-12-07Bibliographically approved
Barker Jørgensen, B., Nørh Glud, R. & Holby, O. (2005). Oxygen distribution and bioirrigation in Artic fjord sediments (Svalbard, Barents Sea). Mar. Ecol. Prog. Ser. 292:85-95
Open this publication in new window or tab >>Oxygen distribution and bioirrigation in Artic fjord sediments (Svalbard, Barents Sea)
2005 (English)In: Mar. Ecol. Prog. Ser. 292:85-95Article in journal (Refereed)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-22203 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Wenzhöfer, F., Holby, O. & Kohls, O. (2001). Deep penetrating benthic oxygen profiles measured in situ by oxygen optodes. Deep-Sea Research I 48: 1741-1755(In press, Deep Sea Research)
Open this publication in new window or tab >>Deep penetrating benthic oxygen profiles measured in situ by oxygen optodes
2001 (English)In: Deep-Sea Research I 48: 1741-1755(In press, Deep Sea Research)Article in journal (Refereed)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-18065 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Fones, G., Davison, W., Holby, O., Jørgensen, B. & Thamdrup, B. (2001). High-resolution metal gradients measured by In Situ DGT/DET deployment in Black Sea sediments using an autonomous benthic lander. Limnol. Oceanogr. 46(4):982-988
Open this publication in new window or tab >>High-resolution metal gradients measured by In Situ DGT/DET deployment in Black Sea sediments using an autonomous benthic lander
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2001 (English)In: Limnol. Oceanogr. 46(4):982-988Article in journal (Refereed)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-19982 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Wenzhöfer, F., Holby, O., Glud, R. N., Nielsen, H. K. & Gundersen, J. K. (2000). In situ microsensor studies of a shallow water hydrothermal vent at Milos, Greece. Marine Chemistry. 69: 43-54
Open this publication in new window or tab >>In situ microsensor studies of a shallow water hydrothermal vent at Milos, Greece
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2000 (English)In: Marine Chemistry. 69: 43-54Article in journal (Refereed)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-20249 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Nørh Glud, R., Gundersen, J. K. & Holby, O. (1999). Benthic in situ respirationin the upwelling area off central Chile. Mar. Ecol. Prog. Ser. 186: 9-18
Open this publication in new window or tab >>Benthic in situ respirationin the upwelling area off central Chile
1999 (English)In: Mar. Ecol. Prog. Ser. 186: 9-18Article in journal (Refereed)
National Category
Energy Systems
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-17347 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
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