Variations in colored dissolved organic matter between boreal lakes studied by satellite remote sensing

• Therehave been major improvements in our understanding of the roleof lakes and impoundments in global carbon cycle. Estimating thetrue role of lakes as sentinels, regulators and integrators ofclimate change requires analyzing carbon content of vast number oflakes. This is not realistic without using remote sensing methods.There are no satellite sensors at the moment that providefull global coverage and at the same time have spatialand radiometric resolutions suitable for lake color dissolved organic matter(CDOM) mapping. Therefore, the global study has to be performedusing more sensitive sensors to create regional lake CDOM statisticsfor as many sites as possible and extrapolating the resultson global lake map that can be created from lesssensitive sensor data with full global coverage (Landsat). As afirst step towards the global lake carbon mapping we showthat the Advanced Land Imager (ALI) allows to study regionalvariations in lake CDOM content and consequently estimate closely correlatedDOC (dissolved organic carbon) and CO2 saturation values. The resultsshow also that there may be regional differences in lakeCDOM content even if the study sites are geographically relativelyclose to each other and occupying zones with similar landcover and annual runoff. In one occasion the difference canbe explained with human impact that has caused acidification oflakes but the other occasion needs further studies.

Ämnesord

NATURVETENSKAP  -- Biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Nyckelord

colored dissolved organic matter

lakes

remote sensing

global carbon cycle

Biology

Biologi

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