Biogeochemical Studies in the Polar Oceans: Achievements in the Arctic Ocean and Challenges in the S

Abstract

The Arctic Ocean is the most severely affected by global warming and ocean acidification on the Earth. How are biological production and material cycles responding to these changes? To clarify this, we have investigated using a sediment trap mooring system and various sensors such as pH/pCO2 in the western Arctic Ocean since 2010, collected biogenic particles and acquired data in a time series, and described the changes in biogeochemical processes. We have also clarified that nitrogen fixation, considered a local biogeochemical process, is found to occur in polar oceans where nitrate and ammonia are abundant. In addition, we have had the opportunity to challenge biogeochemical research in the Southern Ocean, East Antarctica. Using an Event-Based Vision Sensor (EVS) developed by Sony, we plan to capture particles of previously unmeasured sizes and estimate the total amount of particles originating from marine organisms with the results of giant particles by sediment trap observations. Numerical simulations are also making progress. In this presentation, I will introduce the results of achievements in the Arctic Ocean and a new challenging research related to the biogeochemical processes through observations in the Southern Ocean.