Role of Oceanic Memory Effects in the Barents Sea in the Seasonal Linkage Between the Winter and Summer Arctic Oscillation. Issue 23 (26th November 2021)

• Record Type: Journal Article
• Authors: Hoshi, Ryosuke; Takahashi, Hiroshi G.
• Is Part Of: Journal of geophysical research. Volume 126:Issue 23(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-26
• Subjects: Arctic climate change -- sea ice -- oceanic memory effect; Atmospheric physics -- Periodicals; Geophysics -- Periodicals; 551.5
• DOI: 10.1029/2021JD034799
• Languages: English
• ISSNs: 2169-897X

Abstract

Abstract: We investigated the mechanism of inter‐seasonal linkage between the winter Arctic Oscillation (AO) and the subsequent summer AO. Our focus was the collapse of the linkage in the late 1980s, associated with substantial sea ice loss in the Arctic. Because atmospheric circulation itself does not have long‐lasting memory effects from winter to summer, the seasonal persistency of sea ice and sea surface temperature (SST) anomalies are likely to contribute to the inter‐seasonal linkage. In the early significant‐linkage period prior to 1990, the winter AO signal was maintained in the sea ice and SST anomalies over the Barents Sea during inter‐seasonal periods. The surface anomalies then influenced the summer atmospheric circulation by exciting the Rossby wave propagation. However, in the recent poor‐linkage period after 1990, sea ice loss in the Barents Sea and Northern Hemisphere was significant. In addition, the seasonal persistency of sea ice and SST anomalies over the Barents Sea were less significant, and the winter AO signal was not maintained beyond a given season. Thus, the oceanic memory effects of the Barents Sea were reduced and might not have been associated with the recent inter‐seasonal linkage. Key Points: Inter‐seasonal linkage between the winter Arctic Oscillation (AO) and the subsequent summer AO collapsed in the late 1980s In the early good‐linkage period, the oceanic memory effects of the Barents Sea had an important role in the inter‐seasonal linkage In recent years, the oceanic memory effects of the Barents Sea have become weaker, which has been related to the seasonal linkage collapse