SOFIE: SOUTHERN OCEAN OVERTURNING FINGERPRINT EXPERIMENT
Most recently signed economic, political, and social
agreements such as the Paris Agreement, the 2030 Agenda for Sustainable
Development, or the FAO's Blue Growth Initiative have as common objective the strengthening of the global response to the threat of climate change
holding the increase in the global average temperature well below 2° C above
pre-industrial levels. Aside of the implementation of ambitious plans on adaptation and mitigation, our
ability to contain climate change within safe limits depends largely on the
evolution of the ocean circulation. Due to its powerful role in modulating the global rate of carbon and heat absorption, there is a critical and
urgent need to develop an approach to assess
changes in Southern Ocean overturning circulation, in order to better
determine its role in global environmental change and to increase our
resilience to such change.
The deep waters
upwelling in the Southern Ocean account for up to half of the annual oceanic
uptake of anthropogenic carbon from the atmosphere, dominate the global
oceanic heat uptake with up to three quarters of the additional heat influx to
the ocean occurring south of 30°S, and are a rich source
of the nutrients that fertilise the majority of global ocean biological
productivity north of 30°S. According to numerical studies, there is consensus that in response to increased westerly winds such as those
occurring within contemporary climate change, variations in the
overturning circulation are likely to be substantial. SOFIE results will be a major step to constrain the changing ability of the Southern Ocean to
slow down the rate of global climate change.
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