Characteristics of precipitation in East Asia associated with Okhotsk Sea blocking in June and July
Abstract This study investigates the influence of Okhotsk Sea blocking (OKB) on summer precipitation in East Asia in terms of the movement, enhancement and extension of the monsoon rainband. For this purpose, a composite analysis is conducted for nine OKB events that occur in June and July from 2000...
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crwiley:10.1002/joc.8403 2024-06-02T08:12:41+00:00 Characteristics of precipitation in East Asia associated with Okhotsk Sea blocking in June and July Song, Chan‐Yeong Ahn, Joong‐Bae Rural Development Administration 2024 http://dx.doi.org/10.1002/joc.8403 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8403 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 44, issue 5, page 1654-1675 ISSN 0899-8418 1097-0088 journal-article 2024 crwiley https://doi.org/10.1002/joc.8403 2024-05-03T11:10:56Z Abstract This study investigates the influence of Okhotsk Sea blocking (OKB) on summer precipitation in East Asia in terms of the movement, enhancement and extension of the monsoon rainband. For this purpose, a composite analysis is conducted for nine OKB events that occur in June and July from 2000 to 2022. The results show that the OKB events that occur in June are associated with decreased precipitation in East Asia, whereas those that occur in July are related to increased precipitation in the same region. The long‐lasting OKB can continuously maintain and intensify anomalous cyclonic circulations in northeastern Asia, leading to enhanced vertically integrated moisture flux convergence (VIMFC) along the northern edge of the Western North Pacific subtropical high. However, there are differences in spatial distribution and displacement of anomalous cyclonic circulations between June and July. The OKB occurring in June is related to simultaneously developing and progressively strengthening anticyclonic circulation in the Okhotsk Sea as well as cyclonic circulation in northeastern Asia. Under the displacement of an intensified and southwardly extended cyclonic circulation, the VIMFC shifts southward and into a southeast‐to‐northwest orientation, compared to climatology, resulting in decreased precipitation in East Asia, particularly in southern China and southern Japan. On the other hand, when the OKB occur in July, anticyclonic circulation in the Okhotsk Sea is developed initially followed by cyclonic circulation in northeastern Asia, amplifying several days after onset. Anomalous cyclonic circulation is much weaker and located more northward than in June, which is favourable for stagnating and enhancing the VIMFC in East Asia. As a result, precipitation can increase in the region, particularly on the Korean Peninsula and in Japan. Article in Journal/Newspaper okhotsk sea Wiley Online Library Okhotsk Pacific International Journal of Climatology |
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Wiley Online Library |
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English |
description |
Abstract This study investigates the influence of Okhotsk Sea blocking (OKB) on summer precipitation in East Asia in terms of the movement, enhancement and extension of the monsoon rainband. For this purpose, a composite analysis is conducted for nine OKB events that occur in June and July from 2000 to 2022. The results show that the OKB events that occur in June are associated with decreased precipitation in East Asia, whereas those that occur in July are related to increased precipitation in the same region. The long‐lasting OKB can continuously maintain and intensify anomalous cyclonic circulations in northeastern Asia, leading to enhanced vertically integrated moisture flux convergence (VIMFC) along the northern edge of the Western North Pacific subtropical high. However, there are differences in spatial distribution and displacement of anomalous cyclonic circulations between June and July. The OKB occurring in June is related to simultaneously developing and progressively strengthening anticyclonic circulation in the Okhotsk Sea as well as cyclonic circulation in northeastern Asia. Under the displacement of an intensified and southwardly extended cyclonic circulation, the VIMFC shifts southward and into a southeast‐to‐northwest orientation, compared to climatology, resulting in decreased precipitation in East Asia, particularly in southern China and southern Japan. On the other hand, when the OKB occur in July, anticyclonic circulation in the Okhotsk Sea is developed initially followed by cyclonic circulation in northeastern Asia, amplifying several days after onset. Anomalous cyclonic circulation is much weaker and located more northward than in June, which is favourable for stagnating and enhancing the VIMFC in East Asia. As a result, precipitation can increase in the region, particularly on the Korean Peninsula and in Japan. |
author2 |
Rural Development Administration |
format |
Article in Journal/Newspaper |
author |
Song, Chan‐Yeong Ahn, Joong‐Bae |
spellingShingle |
Song, Chan‐Yeong Ahn, Joong‐Bae Characteristics of precipitation in East Asia associated with Okhotsk Sea blocking in June and July |
author_facet |
Song, Chan‐Yeong Ahn, Joong‐Bae |
author_sort |
Song, Chan‐Yeong |
title |
Characteristics of precipitation in East Asia associated with Okhotsk Sea blocking in June and July |
title_short |
Characteristics of precipitation in East Asia associated with Okhotsk Sea blocking in June and July |
title_full |
Characteristics of precipitation in East Asia associated with Okhotsk Sea blocking in June and July |
title_fullStr |
Characteristics of precipitation in East Asia associated with Okhotsk Sea blocking in June and July |
title_full_unstemmed |
Characteristics of precipitation in East Asia associated with Okhotsk Sea blocking in June and July |
title_sort |
characteristics of precipitation in east asia associated with okhotsk sea blocking in june and july |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1002/joc.8403 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8403 |
geographic |
Okhotsk Pacific |
geographic_facet |
Okhotsk Pacific |
genre |
okhotsk sea |
genre_facet |
okhotsk sea |
op_source |
International Journal of Climatology volume 44, issue 5, page 1654-1675 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.8403 |
container_title |
International Journal of Climatology |
_version_ |
1800759210341826560 |