Variability along the Atlantic water pathway in the forced Norwegian Earth System Model

H. R. Langehaug*, A. B. Sandø, M. Årthun, M. Ilıcak

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12 Atıf (Scopus)

Özet

The growing attention on mechanisms that can provide predictability on interannual-to-decadal time scales, makes it necessary to identify how well climate models represent such mechanisms. In this study we use a high (0.25° horizontal grid) and a medium (1°) resolution version of a forced global ocean-sea ice model, utilising the Norwegian Earth System Model, to assess the impact of increased ocean resolution. Our target is the simulation of temperature and salinity anomalies along the pathway of warm Atlantic water in the subpolar North Atlantic and the Nordic Seas. Although the high resolution version has larger biases in general at the ocean surface, the poleward propagation of thermohaline anomalies is better resolved in this version, i.e., the time for an anomaly to travel northward is more similar to observation based estimates. The extent of these anomalies can be rather large in both model versions, as also seen in observations, e.g., stretching from Scotland to northern Norway. The easternmost branch into the Nordic and Barents Seas, carrying warm Atlantic water, is also improved by higher resolution, both in terms of mean heat transport and variability in thermohaline properties. A more detailed assessment of the link between the North Atlantic Ocean circulation and the thermohaline anomalies at the entrance of the Nordic Seas reveals that the high resolution is more consistent with mechanisms that are previously published. This suggests better dynamics and variability in the subpolar region and the Nordic Seas in the high resolution compared to the medium resolution. This is most likely due a better representation of the mean circulation in the studied region when using higher resolution. As the poleward propagation of ocean heat anomalies is considered to be a key source of climate predictability, we recommend that similar methodology presented herein should be performed on coupled climate models that are used for climate prediction.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)1211-1230
Sayfa sayısı20
DergiClimate Dynamics
Hacim52
Basın numarası1-2
DOI'lar
Yayın durumuYayınlandı - 24 Oca 2019

Bibliyografik not

Publisher Copyright:
© 2018, The Author(s).

Finansman

Acknowledgements The research leading to these results have received funding from the European Union 7th Framework Programme (FP7 2007–2013) under Grant agreement no. 308299 (HRL). HRL and ABS acknowledge support from the Research Council of Norway (NFR) EPOCASA Project (Grant 229774), and also the NFR NORTH Project (Grant 229763) has provided funding for the study (HRL, ABS, and MI). MI is also supported by the SKD BASIC Project and Ice2Ice Project that has received funding from FP7 2007–2013 under Grant agreement no. 610055. MÅ has been funded by the NFR PATHWAY Project (Grant 263223), and the Blue-Action Project (European Union’s Horizon 2020 research and innovation program, Grant 727852).

FinansörlerFinansör numarası
NFR229763, 229774
Horizon 2020 Framework Programme
Seventh Framework Programme308299, 610055, 263223, 727852
Norges Forskningsråd

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