The project conducted field sampling in the Yukon River, delta and plume waters for two transects in spring/summer of 2022 and 2023 and acquisition of additional transect samples during similar flow regimes through our collaborators. Field measurements included a number of water quality parameters relevant to Arctic biogeochemical function and NASA products, including dissolved organic matter (DOM), particulate organic matter (POM), suspended particulate matter (SPM), chlorophyll-a, radiometry, in situ inherent optical properties, discrete dissolved and particle absorption, fluorescent DOM (FDOM), lignin phenols, HPLC pigments, bioavailability of dissolved organic carbon (DOC).