Dissolved organic matter (DOM) represents many compounds critical for maintaining carbon and nutrient cycling in marine environments. However, global climate change may drastically alter these dynamics, particularly in the Southern Ocean. This research will investigate whether the increased input of terrestrial organic matter into the marine environment, resulting from accelerated moss growth and melting glaciers, can explain the effects of climate change on the composition of DOM in the Southern Ocean and its impact on carbon and nutrient cycling. To achieve this, we will collect surface seawater samples from different sectors of the northern Antarctic Peninsula during the summer. Chemical analysis of these samples will allow us to classify the major organic compounds present in the seawater, verify which areas of the northern Antarctic Peninsula are most susceptible to terrestrial DOM inputs over time, and determine the bioavailability of these compounds for uptake and use in carbon and nutrient cycling.