Journal
ATMOSPHERIC SCIENCE LETTERS
Volume 23, Issue 7, Pages -Publisher
WILEY
DOI: 10.1002/asl.1089
Keywords
Aleutian low; Arctic oscillation; correlation; interdecadal variation; surface air temperature
Funding
- Korean Meteorological Administration Research and Development Program [KMA2018-00322]
- National Research Foundation (NRF) [2021M316A1086803]
- Korea Meteorological Institute (KMI) [KMA2018-00322] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The study investigates the interdecadal relationship changes between the Arctic oscillation (AO) and Aleutian low (AL). The results show a weakening AO-AL relationship since the mid-1990s, leading to a decrease in the impact on surface air temperature (SAT) over Eastern Eurasia. The study suggests that low-frequency atmospheric circulation changes, such as AO and AL, should be considered when studying SAT changes in Eastern Eurasia.
We investigated interdecadal relationship changes between the Arctic oscillation (AO) and Aleutian low (AL) for the period 1980-2021 along with the linkage on surface air temperature (SAT) over Eastern Eurasia during the boreal winter (December-January-February). The AO-AL relationship has weakened since the mid-1990s. To explore a possible explanation, we compared atmospheric fields for two contrasting periods, one when the AO-AL relationship is the strongest (1986-2006) and one when it is the weakest (2000-2020). In both periods, atmospheric circulation over the Arctic region for the two AO-AL in-phase relationships (i.e., either +AO/+AL or -AO/-AL) evolves with negative AO-like patterns, contributing to a weakening AO-AL relationship in concurrent with a cool SAT in Eastern Eurasia. We found that the correlation between AL and SAT over Eastern Eurasia decreases, while the AO and SAT correlation remains unchanged. This implies that low-frequency atmospheric circulation changes such as those of the AO and AL should be considered when studying SAT changes in Eastern Eurasia.
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