INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Global Scale Fluorescence Characterization Of Dissolved Organic Matter In Alpine And Remote Lakes
Autor/es:
MLADENOV, N., MORALES-BAQUERO, R., SOMMARUGA, R., CAMARERO, L., LAURION, I., DIÉGUEZ, M. C. & RECHE, I.
Lugar:
Niza, Francia
Reunión:
Congreso; ASLO 2009; 2009
Institución organizadora:
American Society of Limnology and Oceanography
Resumen:
Due to their position in the landscape, alpine and remote lakes provide essential end
member biogeochemical information without the confounding effects of diverse
terrestrial inputs and local anthropogenic pollution. Here we take advantage of a global
network of remote lakes (ECOSENSOR) to examine dissolved organic matter (DOM)
in lakes of the Atlas Mountains (Morocco), the Sierra Nevada and Pyrenees (Spain),
the Alps (Austria), the Patagonian Andes (Argentina), and the Canadian Arctic. Using
PARAFAC modeling of fluorescence spectra, we found that the most remote alpine
lakes exhibited high protein-like fluorescence, lack of a distinct humic peak (excitation/
emission 350/420-480nm), and low fluorescence at high excitation wavelengths. We
further evaluated the influence of Saharan dust deposition on lake DOM and found that,
across a gradient of low to high deposition (Austria-Morocco), there was an increase in
DOC, absorption coefficients, and fluorescence intensity. In light of rising desertification
linked to global change, these results suggest that atmospheric dust deposition may be
an important, yet thus far unrecognized control on lake DOM dynamics and that remote
lakes provide a unique opportunity to monitor this influence.