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Spatial length scale in δ18O observations

This study presents an analysis conducted to determine the length scales of oxygen isotope (δ18O) variations in the surface ocean based on observational data. The findings reveal the presence of three length scales depending on the segment length being analyzed. These length scales are categorized as eddy scale (typically 100-300 km), intermediate scale (500-700 km), and gyre scale (1000-1500 km). The spatial distribution of the decorrelation length scales highlights the widespread presence of eddies in the Southern Ocean. In contrast, the longer length scales illustrate the zonal characteristics of the Antarctic Circumpolar Current and the structure of the Ross and Weddell gyres. The observed differences in spatial patterns indicate that at the largest scales, the decorrelation length scales are anisotropic, with meridional scales mainly reflecting the circumpolar current and northward scales indicating the spread of Subantarctic Mode Waters.

Our speaker

Mathilde is a Master's student in Physical Oceanography at the University of Bergen. She is a Marine Engineer who chose to specialize in Physical Oceanography through a research Master in Bergen. During her engineering Master's thesis, she worked for the European project OCEAN:ICE and developed a model to track the oxygen isotopes emerging from the melting of the ice sheets in Antarctica. She is now working on basal melting beneath the Fimbul Ice Shelf as part of her Master's thesis in Bergen and will continue on this path in the future through a PhD program.

What is a Climate Coffee?

#climatecoffees are short (circa 40 min: 20 min talk + 20 min Q&A), relaxed meetings for scientists to share ideas, discuss methods and communicate new results. They are open to speakers of all levels of seniority, we especially encourage early-career scientists to become a speaker. The Coffees are an exciting opportunity for scientists to build a network and disseminate recent results, peer-to-peer. We invite researchers from across the climate science community to join us for this series of regular online knowledge exchange events.

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Organisation

The Climate Coffees are organized by the Horizon Europe project OCEAN:ICE, the Danish Meteorological Institute and the European Climate Research Alliance.

Looking forward to seeing you at this Climate Coffee!

Chiara, Erika (OCEAN:ICE/DMI) and Sissi (ECRA)

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Climate coffee with Mathilde Helbert