Intra‐Seasonal Variabilities Associated With Tropical Cyclones in Eastern and Southeastern Asian Regions and Their Recent Change
Abstract This study focuses on the diverse intra‐seasonal variabilities (ISVs) exhibited by tropical cyclone (TC) occurrence frequency affecting southeastern and eastern Asian regions, classified as SEATOFs and EATC occurrence frequency (EATOFs). Both groups exhibit pronounced 8–20‐day variability,...
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| Format: | Article |
| Language: | English |
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Wiley
2025-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2025GL116723 |
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| _version_ | 1849236750628552704 |
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| author | Rui Jin Johnny C. L. Chan Hui Yu Peng Zhang |
| author_facet | Rui Jin Johnny C. L. Chan Hui Yu Peng Zhang |
| author_sort | Rui Jin |
| collection | DOAJ |
| description | Abstract This study focuses on the diverse intra‐seasonal variabilities (ISVs) exhibited by tropical cyclone (TC) occurrence frequency affecting southeastern and eastern Asian regions, classified as SEATOFs and EATC occurrence frequency (EATOFs). Both groups exhibit pronounced 8–20‐day variability, particularly in EATOFs, whereas SEATOFs demonstrate an additional 20–60‐day peak. The corresponding 8–20‐day atmospheric ISVs are focused on, which closely mirror the tropical quasi‐biweekly oscillation (QBWO) but differ in spatial structure. SEATOFs are tied to a zonally elongated, westward‐propagating QBWO (W‐QBWO), while EATOFs are linked to a west‐northward‐propagating QBWO (NW‐QBWO) with a slight southwest‐northeast tilt and intensified perturbations along the East Asian coast. Notably, EATOFs and their 8–20‐day ISV amplitude have concurrently increased since the late 1990s. This shift can be attributed to an interdecadal shift of QBWO dominance from W‐QBWO to NW‐QBWO. These results highlight the QBWO's substantial influence on TC activities across both Asian regions, particularly along the East Asian coast. |
| format | Article |
| id | doaj-art-71041be0d4964be5a44aa80528cb04e2 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-71041be0d4964be5a44aa80528cb04e22025-08-20T04:02:09ZengWileyGeophysical Research Letters0094-82761944-80072025-07-015213n/an/a10.1029/2025GL116723Intra‐Seasonal Variabilities Associated With Tropical Cyclones in Eastern and Southeastern Asian Regions and Their Recent ChangeRui Jin0Johnny C. L. Chan1Hui Yu2Peng Zhang3Shanghai Typhoon Institute of China Meteorological Administration Shanghai ChinaShanghai Typhoon Institute of China Meteorological Administration Shanghai ChinaShanghai Typhoon Institute of China Meteorological Administration Shanghai ChinaDepartment of Atmospheric and Oceanic Sciences & Institute of Atmospheric Science Fudan University Shanghai ChinaAbstract This study focuses on the diverse intra‐seasonal variabilities (ISVs) exhibited by tropical cyclone (TC) occurrence frequency affecting southeastern and eastern Asian regions, classified as SEATOFs and EATC occurrence frequency (EATOFs). Both groups exhibit pronounced 8–20‐day variability, particularly in EATOFs, whereas SEATOFs demonstrate an additional 20–60‐day peak. The corresponding 8–20‐day atmospheric ISVs are focused on, which closely mirror the tropical quasi‐biweekly oscillation (QBWO) but differ in spatial structure. SEATOFs are tied to a zonally elongated, westward‐propagating QBWO (W‐QBWO), while EATOFs are linked to a west‐northward‐propagating QBWO (NW‐QBWO) with a slight southwest‐northeast tilt and intensified perturbations along the East Asian coast. Notably, EATOFs and their 8–20‐day ISV amplitude have concurrently increased since the late 1990s. This shift can be attributed to an interdecadal shift of QBWO dominance from W‐QBWO to NW‐QBWO. These results highlight the QBWO's substantial influence on TC activities across both Asian regions, particularly along the East Asian coast.https://doi.org/10.1029/2025GL116723tropical cyclonecoastal Asian regionintraseasonal variabilityquasi‐biweekly oscillation |
| spellingShingle | Rui Jin Johnny C. L. Chan Hui Yu Peng Zhang Intra‐Seasonal Variabilities Associated With Tropical Cyclones in Eastern and Southeastern Asian Regions and Their Recent Change Geophysical Research Letters tropical cyclone coastal Asian region intraseasonal variability quasi‐biweekly oscillation |
| title | Intra‐Seasonal Variabilities Associated With Tropical Cyclones in Eastern and Southeastern Asian Regions and Their Recent Change |
| title_full | Intra‐Seasonal Variabilities Associated With Tropical Cyclones in Eastern and Southeastern Asian Regions and Their Recent Change |
| title_fullStr | Intra‐Seasonal Variabilities Associated With Tropical Cyclones in Eastern and Southeastern Asian Regions and Their Recent Change |
| title_full_unstemmed | Intra‐Seasonal Variabilities Associated With Tropical Cyclones in Eastern and Southeastern Asian Regions and Their Recent Change |
| title_short | Intra‐Seasonal Variabilities Associated With Tropical Cyclones in Eastern and Southeastern Asian Regions and Their Recent Change |
| title_sort | intra seasonal variabilities associated with tropical cyclones in eastern and southeastern asian regions and their recent change |
| topic | tropical cyclone coastal Asian region intraseasonal variability quasi‐biweekly oscillation |
| url | https://doi.org/10.1029/2025GL116723 |
| work_keys_str_mv | AT ruijin intraseasonalvariabilitiesassociatedwithtropicalcyclonesineasternandsoutheasternasianregionsandtheirrecentchange AT johnnyclchan intraseasonalvariabilitiesassociatedwithtropicalcyclonesineasternandsoutheasternasianregionsandtheirrecentchange AT huiyu intraseasonalvariabilitiesassociatedwithtropicalcyclonesineasternandsoutheasternasianregionsandtheirrecentchange AT pengzhang intraseasonalvariabilitiesassociatedwithtropicalcyclonesineasternandsoutheasternasianregionsandtheirrecentchange |