Tropics-to-Arctic teleconnection
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Our CESM2 pacemaker simulations demonstrate that wintertime Arctic temperature anomalies are controlled by tropical SSTs during major El Niño events.
The 1997–1998 cold pan-Arctic during winter can be explained by anomalously high far eastern equatorial Pacific SSTs during 1997–1998. Consistently, during the 2017–2018 La Niña, unusually low SSTs in the same region contributed to pan-Arctic warming.
H.-I. Jeong., *H.-S. Park, M. F. Stuecker and S.-W. Yeh, 2021: Distinct impacts of major El Niño events on Arctic temperatures due to differences in eastern tropical Pacific sea surface temperatures. Science Advances, 8, 1-11
Sea ice dynamics
We have derived an analytical model for wind-driven free sea ice drift. We allow for partial sea ice cover using the "mixture layer" formulation and explicitly assume an oceanic Ekman layer, separated from the ice by a thin boundary layer.
Provided that surface wind field is known, it is easy to calculate sea ice motion using this analytical model. We believe this analytical model is going to be a powerful tool for identifying and quantifying the mechanisms for sea ice variability.
* Park, H.-S. and A. L. Stewart, 2016: An analytical model for wind-driven Arctic summer sea ice drift, The Cryosphere, 10, 227-244.
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