Anomalous variation in summer tropical cyclone activity by preceding winter Aleutian low oscillation

Abstract This research found a high‐positive correlation between Aleutian low oscillation during the winter (November–March) and tropical cyclone ( TC ) genesis frequency during the following summer (July–September) over a 26‐year period (1982–2007). In the years with high Aleutian low oscillation,...

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Bibliographic Details
Published in:Atmospheric Science Letters
Main Authors: Choi, Jae‐Won, Cha, Yumi
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2017
Subjects:
Bering Sea
Okhotsk
Pacific
aleutian low
Sea ice
Online Access:http://dx.doi.org/10.1002/asl.752
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fasl.752
https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/asl.752
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Summary:Abstract This research found a high‐positive correlation between Aleutian low oscillation during the winter (November–March) and tropical cyclone ( TC ) genesis frequency during the following summer (July–September) over a 26‐year period (1982–2007). In the years with high Aleutian low oscillation, a number of characteristics were analyzed. In the preceding winter, anomalous pressure patterns, such as south‐low and north‐high at the low level, formed as the center for the regions near 20°N in the western North Pacific. Sea ice concentration was less than the average around the Sea of Okhotsk and the Bering Sea, which weakened the Aleutian Low in this area. This anomalous pressure pattern continued until the following summer, and it reinforced the anomalous easterlies at the mid‐latitudes (20°–40°N) in East Asia and contributed to the high TC passage frequency in the East Asian continent.

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