|   | 
Details
   web
Records
Author Amon, RMW; Budéus, G; Meon, B
Title Dissolved organic carbon distribution and origin in the Nordic Seas: Exchanges with the Arctic Ocean and the North Atlantic Type Journal Article
Year 2003 Publication Journal of Geophysical Research Abbreviated Journal J Geophys Res
Volume 108 Issue C7 Pages (up)
Keywords dissolved organic matter; dissolved organic carbon; chromophoric dissolved organic matter; fluorescence; vertical carbon transport
Abstract Dissolved organic carbon (DOC) and in situ fluorescence were measured along with hydrographic parameters in the Greenland, Iceland, and Norwegian Seas (Nordic Seas). Surface (<100 m) concentrations of DOC ranged from 60 to 118 µM with elevated values in the East Greenland Current (EGC) which transports water from the Arctic Ocean to the North Atlantic. EGC surface waters also showed a pronounced fluorescence maximum between 30 and 120 m depth in all EGC sections indicating the abundance of Arctic river derived DOC in this current. Based on fluorescence we estimated that 20-50% of the annual river discharge to the Arctic Ocean was exported in the EGC. The fluorescence maximum was typically associated with salinity around 33 and temperatures below -1°C which are characteristic of surface and upper halocline water in the Arctic Ocean. The elevated fluorescence in this water mass suggests a strong Eurasian shelf component and also suggests that in situ fluorescence could be used to trace Eurasian shelf water in the central Arctic Ocean. DOC concentrations in the Nordic Sea basins (>1000 m) were relatively high (~50 µM DOC) compared with other ocean basins indicating active vertical transport of DOC in this region on decadal timescales. Based on existing vertical transport estimates and 15 µM of semilabile DOC we calculated an annual vertical net DOC export of 3.5 Tg C yr-1 in the Greenland Sea and about 36 Tg C yr-1 for the entire Arctic Mediterranean Sea (AMS) including the Greenland-Scotland Ridge overflow. It appears that physical processes play a determining role for the distribution of DOC in the AMS.
Address
Corporate Author Thesis
Publisher American Geophysical Union Place of Publication Washington, DC Editor
Language English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Nordic Seas Expedition Conference
Notes Approved no
Call Number refbase @ user @ ms Serial 5
Permanent link to this record
 

 
Author Granskog, M.
Title Investigations into the physical and chemical properties of Baltic Sea ice Type Book Whole
Year 2004 Publication Abbreviated Journal
Volume Issue Pages (up)
Keywords sea ice; snow-ice; superimposed ice; meteoric ice; chemistry; nutrients; trace elements; Baltic Sea
Abstract Sea ice is a key component of polar and sub-polar seas, including the Baltic Sea. It not only affects climate, from global to local scales, but also strongly modifies the conditions in the marine environment through freezing and eventual melt in several ways. The role of snow in sea ice growth is presumed to be high in the Baltic Sea, although very little quantitative information is available on the contribution of precipitation to ice growth in the Baltic Sea. Even less is known about the chemistry of sea ice and its role as a moderator of (bio)geochemical cycling and budgets of elements in the Baltic Sea. The aim of this Thesis is to shed new light on these matters.The importance of snow and precipitation on the growth of Baltic Sea ice is vital. For the first time, the stable oxygen isotopic composition of ice, snow and water were used to quantify the amount of snow and precipitation incorporated into the sea ice cover. Results show that meteoric ice (precipitation transformed to ice) constitute up to 35% of the total sea ice mass, much higher than reported elsewhere. Furthermore, the formation of superimposed ice (refrozen snow melt or rain) seem to be important as well, presumably due to the mild ice climate conditions in the region.The atmospheric load is also important in the chemical budgets of several elements, in particular nitrogen and lead, in the sea ice cover. The sea ice cover acts as a buffer for accumulated substances until its inevitable melt. However, the accumulated nutrients are transported through the ice at times when the ice becomes permeable. This, in turn, makes the accumulated nutrients available in the lower ice layers as well as in under-ice water, potentially affecting algal growth. The chemical budgets and the seasonal cycling of elements with selective rejection/retention during freezing of seawater are potentially affected, especially in the shallow regions of the Bothnian Bay.
Address
Corporate Author Thesis Ph.D. thesis
Publisher University of Helsinki Place of Publication Helsinki Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN 952-91-6613-3 Medium
Area Expedition Conference
Notes Academic dissertation in geophysics at the Faculty of Science of the University of Helsinki; Printed version includes 5 original papers; Online-ISBN: 952-10-1485-7 Approved no
Call Number refbase @ admin @ Granskog2004 Serial 13
Permanent link to this record
 

 
Author Leppäranta, M.; Palosuo, E.; Grönvall, H.; Kalliosaari, S.; Seinä, A.; Peltola, J. (eds)
Title Phases of the ice season in the Baltic Sea (North of 57°N) Type Book Whole
Year 1988 Publication Abbreviated Journal
Volume Issue Pages (up)
Keywords Ice; Ice Extent / Cover; Baltic Sea
Abstract
Address
Corporate Author Thesis
Publisher Finnish Institute of Marine Research Place of Publication Helsinki Editor Leppäranta, M.; Palosuo, E.; Grönvall, H.; Kalliosaari, S.; Seinä, A.; Peltola, J.
Language Summary Language Original Title
Series Editor Series Title Finnish Marine Research Abbreviated Series Title Finnish Mar Res
Series Volume 254 Series Issue Edition
ISSN ISBN 0357-1076 Medium
Area Expedition Conference
Notes Approved no
Call Number refbase @ admin @ Leppaeranta_etal1988 Serial 20
Permanent link to this record
 

 
Author Meiners, K.
Title Sea-ice communities: structure and composition in Baltic, Antarctic and Arctic seas Type Book Whole
Year 2002 Publication Abbreviated Journal
Volume Issue Pages (up)
Keywords Baltic Sea
Abstract Sea ice is an important structural component of polar marine ecosystems but also at lower latitude seas like e.g. the northern Baltic Sea. This study summarises observations on biological, chemical and physical characteristics of sea ice and under-ice water obtained during three expeditions to the Baltic Sea, the Fram Strait area (Arctic) and the Bellingshausen Sea (Antarctica). The study aimed at a better understanding and quantification of different components of the sea ice related food web. The seasonal Baltic sea ice is least studied and therefore the work in this area focused on an inventory determination of the abundance and biomass composition of the sympagic (=ice-associated) community of the Bothnian Bay and Bothnian Sea as well as on the importance of abiotic and biotic factors in the control of ice algal accumulation. The work on the better explored polar sea ice focused on the abundance, distribution and characteristics of transparent exopolymer particles (TEP) in Arctic and Antarctic sea ice. TEP are a recently described class of exopolymeric particles, which are formed abiotically and biotically from polysaccharid-rich precursors. High amounts of TEP-precursors are released by bacteria and algae especially in response to environmental stress. In the pelagic realm TEP are important in the aggregation of diatom blooms, provide the matrix of macroaggregates and serve as substrate and habitat for attached bacteria. High concentrations of TEP have been recently described for Arctic sea ice and may have an important impact on carbon dynamics in sea-ice systems. The present study related TEP concentrations to biotic and abiotic sea ice parameters, potential modes of TEP formation were elucidated and the importance of TEP for the sea-ice habitat was discussed.
Address
Corporate Author Thesis Doctoral thesis
Publisher Institut für Polarökologie, Universität Kiel Place of Publication Kiel Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Dissertation; plus 20 pages Appendix Approved no
Call Number refbase @ admin @ Meiners2002 Serial 21
Permanent link to this record
 

 
Author Mälkki, P.; Tamsalu, R.
Title Physical features of the Baltic Sea Type Book Whole
Year 1985 Publication Abbreviated Journal
Volume Issue Pages (up)
Keywords Baltic Sea; Bottom Topography; Climate; Salinity; Temperature; Ice; Ice Extent / Cover
Abstract
Address
Corporate Author Thesis
Publisher Finnish Institute of Marine Research Place of Publication Helsinki Editor
Language Summary Language Original Title
Series Editor Series Title Finnish Marine Research Abbreviated Series Title Finnish Mar Res
Series Volume 252 Series Issue Edition
ISSN ISBN 951-46-8594-6 Medium
Area Expedition Conference
Notes authors report that ice coverage lasts for 2 to 6 months (mean: 3 months) on the SW coast of Finland Approved no
Call Number refbase @ admin @ Maelkki+Tamsalu1985 Serial 24
Permanent link to this record