Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Physical environment in the Gulf of Bothnia
SMHI, Research Department, Oceanography.
1996 (English)In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, 5-12 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

The Gulf of Bothnia contains about 29% of the whole water volume of the Baltic Sea. The water exchange between the Baltic proper and the Gulf is good, which results in a water renewal time of about 4 to 5 yrs. The dynamics and thermodynamics of the Gulf of Bothnia are guided by hydrological, meteorological and, partly, topographical factors, such as freshwater supply, wind over sea, sun radiation, sea ice and sill depth between the sub-basins, The water mass is vertically divided into two layers with a halocline at 50 to 60 m depth. The deep water, below 60 m, mainly originates from the upper layer of the Baltic proper and has a salinity of 6-7 psu. In the surface layer, a thermocline develops each summer. This upper well-mixed layer is, on average, 15 m deep. The north to south water transport mainly occurs in this surface layer along the coasts, with a tendency to cyclonic circulation. It is, however, strongly wind-dependent and thus intermittent in time, On a long time scale, pulse-like wind events produce on average an eastbound current drift in the open sea. The river runoff causes a slow southbound current drift of diluted freshwater along the western region of the Bothnian Sea. Distribution and deposition of dissolved and particulate matter occurs with several types of transport mechanisms. Our measurements during 1991 show that in the surface water, substances can be distributed right across the Bothnian Sea in about one to two weeks, but perhaps more normally in about one month, The geographical extension of the accumulation bottoms is most often limited to areas deeper than 40 m. Transport of particulate matter can however also occur below this critical depth especially during periods of strong winds, forcing wind waves of sufficient wave length and amplitude to erode bottom particulate matter.

Place, publisher, year, edition, pages
FIMR,DEPT PHYS,FIN-00931 HELSINKI,FINLAND. UMEA UNIV,DEPT PHYS GEOG,S-90187 UMEA,SWEDEN., 1996. 5-12 p.
National Category
Oceanography, Hydrology, Water Resources
Research subject
Oceanography
Identifiers
URN: urn:nbn:se:smhi:diva-1633ISI: A1996VR48000002OAI: oai:DiVA.org:smhi-1633DiVA: diva2:897596
Available from: 2016-01-26 Created: 2015-12-22 Last updated: 2017-11-30Bibliographically approved

Open Access in DiVA

No full text

By organisation
Oceanography
In the same journal
Ambio
Oceanography, Hydrology, Water Resources

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 23 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.29.0
|