Changes in the role of Pacific decadal oscillation on sea ice extent variability across the mid-1990s

Characteristics of sea ice extent (SIE) have been rapidly changing in the Pacific Arctic sector (PAS) in recent years. The SIE variability in PAS during the late spring and early summer (i.e., April–May–June, AMJ) plays a key role in determining the SIE during the following fall when SIE is at a min...

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Bibliographic Details
Published in:Scientific Reports
Main Authors: Kim, Hyerim, Yeh, Sang-Wook, An, Soon-Il, Song, Se-Yong
Format: Text
Language:English
Published: Nature Publishing Group UK 2020
Subjects:
Article
Arctic
Pacific
Pacific Arctic
Sea ice
Alaska
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7567812/
http://www.ncbi.nlm.nih.gov/pubmed/33067517
https://doi.org/10.1038/s41598-020-74260-0
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Summary:Characteristics of sea ice extent (SIE) have been rapidly changing in the Pacific Arctic sector (PAS) in recent years. The SIE variability in PAS during the late spring and early summer (i.e., April–May–June, AMJ) plays a key role in determining the SIE during the following fall when SIE is at a minimum. We find that the Pacific Decadal Oscillation (PDO), which is the most dominant variability of sea surface temperature (SST) on the low-frequency timescales, differently influences the SIE in PAS during AMJ before and after the mid-1990s. While a positive phase of PDO during the previous winter acts to increases SIE during AMJ before the mid-1990s, it acts to decrease SIE during AMJ after the mid-1990s. Further analysis indicates that atmospheric circulation associated with PDO differently influences the variability of SIE in the PAS during AMJ by modulating poleward moisture transport across the Alaska or the Far East Asia peninsula. This results in the change in the relationship of PDO and SIE in the PAS before and after the mid-1990s.

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