Linear Response Function Reveals the Most Effective Remote Forcing in Causing September Arctic Sea Ice Melting in CESM

Wu, Yutian; Lu, Jian; Ding, Qinghua; Liu, Fukai

doi:10.1029/2021GL094189

Linear Response Function Reveals the Most Effective Remote Forcing in Causing September Arctic Sea Ice Melting in CESM

Journal Article · Mon Aug 16 04:00:00 EDT 2021 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2021GL094189· OSTI ID:1821181

Wu, Yutian ^[1]; Lu, Jian ^[2]; Ding, Qinghua ^[3]; Liu, Fukai ^[4]

New York University
BATTELLE (PACIFIC NW LAB)
UNIVERSITY OF WASHINGTON
UNIVERSITY PROGRAMS

We apply the linear response function method to investigate the most excitable mode of the September Arctic sea ice and its corresponding remote oceanic forcing in climate models. The method is useful in identifying the fundamental, dynamical and causal relationship between the remote forcing and sea ice response. We find that the most excitable mode of the September Arctic sea ice preferentially takes place over the Pacic side of the Arctic and its remote forcing corresponds to a dipole pattern of precipitation anomaly in the tropics with an increase of precipitation over the western and central tropical and subtropical Pacic ocean while a decrease over the Maritime Continent. The tropical precipitation anomaly likely drives a Rossby wave train propagating toward higher latitudes and leads to a ridge anomaly over the Pacic side of the Arctic, resulting in poleward atmospheric heat transport, enhanced downward longwave radiation and thus melting of the sea ice. In addition, a good agreement is found with the leading tropical Arctic teleconnection mode detected in a pre-industrial control simulation, which supports the usefulness and robustness of the linear response function method and the importance of tropical forcing in shaping the sea ice variability.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1821181

Report Number(s):: PNNL-SA-154552

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 15 Vol. 48

Country of Publication:: United States

Language:: English

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