Pirkko Kortelainen

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Carbon dioxide (CO2) transfer from inland waters to the atmosphere, known as CO2 evasion, is a component of the global carbon cycle. Global estimates of CO2 evasion have been hampered, however, by the lack of a framework for estimating the inland water surface area and gas transfer velocity and by the absence of a global CO2 database. Here we report(More)
The quantity of carbon dioxide (CO2) emissions from inland waters into the atmosphere varies, depending on spatial and temporal variations in the partial pressure of CO2 (pCO2) in waters. Using 22,664 water samples from 851 boreal lakes and 64 boreal streams, taken from different water depths and during different months we found large spatial and temporal(More)
Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Abstract As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to(More)
Finnish rivers exported annually on average 1.2 M t carbon, and total organic carbon (TOC) comprised the major share (nearly 80 %) of this export. The mean area specific carbon export was 4.5 g C m−2 year−1. The highest organic carbon export originated from peat dominated catchments, whereas rivers draining agricultural catchments had the highest(More)
  • M Søndergaard, D N Thomas, Morten Søndergaard, Niels Henrik Borch, David Bowers, Dylan Evans +12 others
  • 2004
Dissolved organic matter (DOM). What is it and why study it? Preface and acknowledgements B y contract EVK3-CT-2000-00034 the European Commission initiated in January 2001 the 36 months research project " Dissolved organic matter (DOM) in coastal ecosystems: transport, dynamics and environmental impact " (www.domaine.ku.dk)*. The overall aim of the project(More)
Northern lakes are ice-covered for considerable portions of the year, where carbon dioxide (CO2) can accumulate below ice, subsequently leading to high CO2 emissions at ice-melt. Current knowledge on the regional control and variability of below ice partial pressure of carbon dioxide (pCO2) is lacking, creating a gap in our understanding of how ice cover(More)
NO3, Mn, Fe, and SO4 act as terminal electron acceptors (TEAs), modifying mineralization pathways and coupling biogeochemical cycles. Although single TEA concentrations and fluxes have been intensively studied, the factors regulating the simultaneous fluxes and molar ratios of TEAs are poorly elucidated. We studied the mean concentrations, exports, and(More)
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