A study on DOM optical properties was conducted in coastal waters of Greenland during two summer expeditions in 2021 and 2022. Water samples for determination of DOM absorption coefficients, DOM fluorescence intensity and total chlorophyll a concentration were collected at fixed depths (surface, chlorophyll a maximum depth, below chlorophyll a maximum depth) of west and east Greenland shelf waters. Based on 91 EEM spectra and application of the PARAFAC, the 5-component model has been developed and validated. The studies revealed a small differences in both quantitative and qualitative properties of DOM optical characteristics between the waters of the East and West Greenland Shelf. The studies indicated that on average FDOM in investigated areas was equally composed by protein-like and humic-like fluorophores although the contribution of fluorescence intensity of the identified protein-like components (I_p) to the total fluorescence intensity (I_T) varied from 30 to 79 % with higher values for surface water samples. The spectral indices: ratio between fluorescence intensity of identified protein-like components to humic-like components, I_p/I_h,  humification index, HIX, and biological index, BIX, have been calculated.

Primary Presenter: MONIKA ZABLOCKA, INSTITUTE OF OCEANOLOGY POLISH ACADEMY OF SCIENCES (monika_z@iopan.pl)

Authors:

Monika Zabłocka, Institute of Oceanology Polish Academy of Sciences  (monika_z@iopan.pl)

Piotr Kowalczuk, Institute of Oceanology Polish Academy of Sciences  (piotr@iopan.pl)

Joanna Stoń-Egiert, Institute of Oceanology Polish Academy of Sciences  (aston@iopan.pl)

Elena Terzic, Institute of Oceanology Polish Academy of Sciences  (eterzic@iopan.pl)

Artur Palacz, Institute of Oceanology Polish Academy of Sciences  (palacz@iopan.pl)