TY  - JOUR
A1  - Dvornikov, Yury
A1  - Leibman, Marina
A1  - Heim, Birgit
A1  - Bartsch, Annett
A1  - Herzschuh, Ulrike
A1  - Skorospekhova, Tatiana
A1  - Fedorova, Irina
A1  - Khomutov, Artem
A1  - Widhalm, Barbara
A1  - Gubarkov, Anatoly
A1  - Rößler, Sebastian
T1  - Terrestrial CDOM in lakes of Yamal Peninsula
BT  - Connection to lake and lake catchment properties
JF  - Remote Sensing
N2  - In this study, we analyze interactions in lake and lake catchment systems of a continuous permafrost area. We assessed colored dissolved organic matter (CDOM) absorption at 440 nm (a(440)(CDOM)) and absorption slope (S300-500) in lakes using field sampling and optical remote sensing data for an area of 350 km(2) in Central Yamal, Siberia. Applying a CDOM algorithm (ratio of green and red band reflectance) for two high spatial resolution multispectral GeoEye-1 and Worldview-2 satellite images, we were able to extrapolate the a()(CDOM) data from 18 lakes sampled in the field to 356 lakes in the study area (model R-2 = 0.79). Values of a(440)(CDOM) in 356 lakes varied from 0.48 to 8.35 m(-1) with a median of 1.43 m(-1). This a()(CDOM) dataset was used to relate lake CDOM to 17 lake and lake catchment parameters derived from optical and radar remote sensing data and from digital elevation model analysis in order to establish the parameters controlling CDOM in lakes on the Yamal Peninsula. Regression tree model and boosted regression tree analysis showed that the activity of cryogenic processes (thermocirques) in the lake shores and lake water level were the two most important controls, explaining 48.4% and 28.4% of lake CDOM, respectively (R-2 = 0.61). Activation of thermocirques led to a large input of terrestrial organic matter and sediments from catchments and thawed permafrost to lakes (n = 15, mean a(440)(CDOM) = 5.3 m(-1)). Large lakes on the floodplain with a connection to Mordy-Yakha River received more CDOM (n = 7, mean a(440)(CDOM) = 3.8 m(-1)) compared to lakes located on higher terraces.
KW  - CDOM
KW  - lakes
KW  - lake catchments
KW  - permafrost
KW  - Yamal
KW  - remote sensing data
Y1  - 2018
U6  - https://doi.org/10.3390/rs10020167
SN  - 2072-4292
VL  - 10
IS  - 2
PB  - MDPI
CY  - Basel
ER  -