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Topic Name: Unique Survey Of Ocean Climate May Improve Climate Predictions
Category: Environmental Fluid Mechanics
Research persons: dr. Tor Eldevik
Location: Nansen, Norway
Details
A research team from the Nansen Environmental and Remote Sensing Center, and the Bjerknes Centre for Climate Research, both in Bergen, Norway, has studied observed anomalies in ocean climate, and identified the anomalies’ progression
with the circulation of the Nordic Seas, and the Norwegian Sea in particular.
The Nordic Seas have been much surveyed by, e.g., Norwegian, Faroese, Icelandic, and (Soviet) Russian research vessels since 1950.
The present study is the first large-scale synthesis of this rich observational
documentation on annual to decadal time scales.
"The traditional and common understanding is that variability in the exchange of water masses between the Nordic Seas and the North Atlantic Ocean is governed by changes in the northern deep waters. Our analysis does not support this concept. We find that anomalies can be traced back to the extension of the Gulf Stream
into the Norwegian Sea," says the lead author of the study, dr. Tor Eldevik of
the Nansen Center.
The Norwegian study improves the understanding of the Atlantic Ocean’s
overturning circulation from a warm Gulf Stream in the surface to a cold return
flow at depth. The analysis thus offer a new benchmark for evaluating which
ocean regions and observations are the more appropriate for understanding past
and present climate change. The study provides an observational basis for the
development of future monitoring or model systems for climate prediction
covering the North Atlantic/Nordic Seas region.
"It is a prerequisite for predicting future climate to identify and understand
the climate variability of recent decades as documented by the instrumental
record. Our study will hopefully be a valuable reference for identifying future
change," says Eldevik.
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