Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea
Abstract The boreal summer intraseasonal oscillation (BSISO) is a major mode of sub‐seasonal variability that regulates the summer climate in East Asia. This study investigates the four possible effects of two different time‐scale BSISOs on temperature and precipitation variations in South Korea. Wh...
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| Language: | English |
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Wiley
2025-01-01
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| Series: | Atmospheric Science Letters |
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| Online Access: | https://doi.org/10.1002/asl.1282 |
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| author | Yoo‐Rim Jung Woo‐Seop Lee |
| author_facet | Yoo‐Rim Jung Woo‐Seop Lee |
| author_sort | Yoo‐Rim Jung |
| collection | DOAJ |
| description | Abstract The boreal summer intraseasonal oscillation (BSISO) is a major mode of sub‐seasonal variability that regulates the summer climate in East Asia. This study investigates the four possible effects of two different time‐scale BSISOs on temperature and precipitation variations in South Korea. When active BSISO convection is positioned over the subtropical western Pacific, it induces anomalous anticyclonic circulation accompanied by subsidence, leading to significant positive temperature anomalies. Conversely, the anomalous cyclonic circulation near the Korean Peninsula, resulting from suppressed convection in the subtropical western Pacific, along with low‐level cold advection anomalies, contributes to a decrease in temperature. The spatial distribution of BSISO convection, which drives precipitation variation, shows a distinctive pattern of three meridionally narrow cells extending from the Philippines to the Korean Peninsula. Suppressed (enhanced) convection to the north of 20°N in the western North Pacific (WNP) promotes the northwestward expansion (eastward contraction) of the WNP Subtropical High in conjunction with a southwesterly (northeasterly) moisture flux anomaly. Furthermore, enhanced (reduced) moisture flux convergence and intensified ascending (descending) motion create favorable conditions for positive (negative) precipitation anomalies in South Korea. The combined effect of BSISOs not only amplifies the mean temperature and precipitation anomalies compared to individual modes but also increases the frequency of warmer, wetter, and drier events. Therefore, monitoring both BSISO modes together is crucial for comprehending and predicting the anomalous summer climate in South Korea. |
| format | Article |
| id | doaj-art-a05bc27cea7445c9abd88f8e11c76a38 |
| institution | Kabale University |
| issn | 1530-261X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Atmospheric Science Letters |
| spelling | doaj-art-a05bc27cea7445c9abd88f8e11c76a382025-01-29T09:47:22ZengWileyAtmospheric Science Letters1530-261X2025-01-01261n/an/a10.1002/asl.1282Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South KoreaYoo‐Rim Jung0Woo‐Seop Lee1Climate Services and Research Department APEC Climate Center Busan South KoreaClimate Services and Research Department APEC Climate Center Busan South KoreaAbstract The boreal summer intraseasonal oscillation (BSISO) is a major mode of sub‐seasonal variability that regulates the summer climate in East Asia. This study investigates the four possible effects of two different time‐scale BSISOs on temperature and precipitation variations in South Korea. When active BSISO convection is positioned over the subtropical western Pacific, it induces anomalous anticyclonic circulation accompanied by subsidence, leading to significant positive temperature anomalies. Conversely, the anomalous cyclonic circulation near the Korean Peninsula, resulting from suppressed convection in the subtropical western Pacific, along with low‐level cold advection anomalies, contributes to a decrease in temperature. The spatial distribution of BSISO convection, which drives precipitation variation, shows a distinctive pattern of three meridionally narrow cells extending from the Philippines to the Korean Peninsula. Suppressed (enhanced) convection to the north of 20°N in the western North Pacific (WNP) promotes the northwestward expansion (eastward contraction) of the WNP Subtropical High in conjunction with a southwesterly (northeasterly) moisture flux anomaly. Furthermore, enhanced (reduced) moisture flux convergence and intensified ascending (descending) motion create favorable conditions for positive (negative) precipitation anomalies in South Korea. The combined effect of BSISOs not only amplifies the mean temperature and precipitation anomalies compared to individual modes but also increases the frequency of warmer, wetter, and drier events. Therefore, monitoring both BSISO modes together is crucial for comprehending and predicting the anomalous summer climate in South Korea.https://doi.org/10.1002/asl.1282boreal summer Intraseasonal oscillation (BSISO)East AsiaIntraseasonal variabilitySouth Koreasub‐seasonal to seasonal (S2S) |
| spellingShingle | Yoo‐Rim Jung Woo‐Seop Lee Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea Atmospheric Science Letters boreal summer Intraseasonal oscillation (BSISO) East Asia Intraseasonal variability South Korea sub‐seasonal to seasonal (S2S) |
| title | Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea |
| title_full | Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea |
| title_fullStr | Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea |
| title_full_unstemmed | Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea |
| title_short | Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea |
| title_sort | influence of the boreal summer intraseasonal oscillation on temperature and precipitation in south korea |
| topic | boreal summer Intraseasonal oscillation (BSISO) East Asia Intraseasonal variability South Korea sub‐seasonal to seasonal (S2S) |
| url | https://doi.org/10.1002/asl.1282 |
| work_keys_str_mv | AT yoorimjung influenceoftheborealsummerintraseasonaloscillationontemperatureandprecipitationinsouthkorea AT wooseoplee influenceoftheborealsummerintraseasonaloscillationontemperatureandprecipitationinsouthkorea |