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Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

The Journal of Latvian Academy of Sciences

6 Issues per year


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1407-009X
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Volume 65, Issue 5-6 (Jan 2011)

Issues

Hydrometeorological parameters and aquatic chemistry of Lake Engure: Trends of changes due to human impact and natural variability

Māris Kļaviņš
  • Faculty of Geography and Earth Sciences, University of Latvia, Raina bulv. 19, Rīga LV-1586, LATVIA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ilga Kokorīte
  • Faculty of Geography and Earth Sciences, University of Latvia, Raina bulv. 19, Rīga LV-1586, LATVIA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Valērijs Rodinovs
  • Faculty of Geography and Earth Sciences, University of Latvia, Raina bulv. 19, Rīga LV-1586, LATVIA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Zanita Avotniece
  • Faculty of Geography and Earth Sciences, University of Latvia, Raina bulv. 19, Rīga LV-1586, LATVIA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Gunta Spriņge
  • Faculty of Geography and Earth Sciences, University of Latvia, Raina bulv. 19, Rīga LV-1586, LATVIA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Agrita Briede
  • Faculty of Geography and Earth Sciences, University of Latvia, Raina bulv. 19, Rīga LV-1586, LATVIA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2012-06-28 | DOI: https://doi.org/10.2478/v10046-011-0029-x

Hydrometeorological parameters and aquatic chemistry of Lake Engure: Trends of changes due to human impact and natural variability

Lake Engure, located in Latvia, is the largest shallow coastal lake that developed after retreat of the Littorina Sea. It supports high biodiversity and has national and international importance. Engure is a hardwater lake with abundant macrophyte and charophyte vegetation. The present study determined the impact of the main meteorological indicators related to global warming, and also indicators of climate extremes. The lake water level is regulated by hydrotechnical constructions. In the the warm period (April-October) of the year the lake level tends to increase. However, from a perspective of long-term changes, there was a good relationship between the Western type of Atmospheric Circulation Index and water level in general, and also between NAO index in March and lake water level in April. Regarding water chemical composition, there has been a decrease of phosphorus concentration while ammonium and nitrate concentrations have not changed. Ionic composition of Lake Engure is characterised by dominance of hydrocarbonates, calcium and magnesium ions.

Engures ezera hidrometeorologisko parametru un ūdeņu ķīmiskā sastāva mainības tendences: antropogēno faktoru un dabiskās mainības ietekmes

Engures ezers kā Rīgas līča piekrastes seklūdens ezers, kas izveidojies, atkāpjoties Litorīnas jūrai, ir nacionāli un starptautiski nozīmīgs, ņemot vērā tā ekosistēmu augsto biologisko daudzveidību. Engures ezera ūdeņus raksturo augsta cietība, kas ietekmē iegremdētās un piekrastes joslas vegetāciju. Pētījumā izvērtēts galveno hidrometeorologisko parametru un klimata indikatoru (it īpaši ekstremālo klimatisko parādību) mainības raksturs un pierādītas globāli noritošās pasiltināšanās ietekmes. Esošo ezera ūdens līmeni nosaka hidrotehnisko būvju izveide, bet gada siltajā periodā ir raksturīgs ūdens līmeņa pieaugums, turklāt ilgtermiņā ezera ūdens līmeņa izmaiņas ietekmē atmosfēras gaisa masu pārnese no Ziemeļatlantijas. Pierādīta korelācija starp Ziemeļatlantijas oscilācijas indeksu martā un ezera ūdens līmeni aprīlī. Ūdens ķīmiskā sastāva izmaiņas raksturo fosfora koncentrāciju samazināšanās un relatīvi stabilas slāpekļa savienojumu koncentrācijas. Neorganisko jonu kompozīciju raksturo kalcija, magnija un hidrogēnkarbonātjonu dominance.

Keywords: Lake Engure; hydrometeorological parameters; aquatic chemistry; trends; extremes

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Published Online: 2012-06-28

Published in Print: 2011-01-01


Citation Information: Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences., ISSN (Print) 1407-009X, DOI: https://doi.org/10.2478/v10046-011-0029-x.

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