The Influence of Environments on the Intensity Change of Typhoon Soudelor
Previous studies have shown that background oceanic and atmospheric environments can influence not only the formation but also the intensity of tropical cyclones. Typhoon Soudelor in August 2015 is notable in that it underwent two rapid intensifications as the storm passed over the Philippine Sea wh...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-01-01
|
| Series: | Atmosphere |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4433/12/2/162 |
| _version_ | 1827597557523546112 |
|---|---|
| author | Leo Oey Yuchen Lin |
| author_facet | Leo Oey Yuchen Lin |
| author_sort | Leo Oey |
| collection | DOAJ |
| description | Previous studies have shown that background oceanic and atmospheric environments can influence not only the formation but also the intensity of tropical cyclones. Typhoon Soudelor in August 2015 is notable in that it underwent two rapid intensifications as the storm passed over the Philippine Sea where the 26 °C isotherm (<i>Z</i><sub>26</sub>) was deeper than 100 m and warm eddies abounded. At the same time, prior to the storm’s arrival, an anomalous upper-level anticyclone developed south of Japan and created a weakened vertical wind shear (<i>V<sub>s</sub></i>) environment that extended into the Philippine Sea. This study examines how the rapid intensification of Typhoon Soudelor may be related to the observed variations of <i>Z</i><sub>26</sub>, <i>V<sub>s</sub></i> and other environmental fields as the storm crossed over them. A regression analysis indicates that the contribution to Soudelor’s intensity variation from <i>V<sub>s</sub></i> is the largest (62%), followed by <i>Z</i><sub>26</sub> (27%) and others. Further analyses using composites then indicate that the weak vertical wind shear produced by the aforementioned anomalous anticyclone is a robust feature in the western North Pacific during the developing summer of strong El Ninos with Oceanic Nino Index (ONI) > 1.5. |
| first_indexed | 2024-03-09T03:34:04Z |
| format | Article |
| id | doaj.art-f8e5c5adae244f2ea4be590a098d4620 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-09T03:34:04Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-f8e5c5adae244f2ea4be590a098d46202023-12-03T14:52:18ZengMDPI AGAtmosphere2073-44332021-01-0112216210.3390/atmos12020162The Influence of Environments on the Intensity Change of Typhoon SoudelorLeo Oey0Yuchen Lin1IHOS, National Central University, Taoyuan City 32001, TaiwanCIGLR, University of Michigan, Ann Arbor, MI 48109, USAPrevious studies have shown that background oceanic and atmospheric environments can influence not only the formation but also the intensity of tropical cyclones. Typhoon Soudelor in August 2015 is notable in that it underwent two rapid intensifications as the storm passed over the Philippine Sea where the 26 °C isotherm (<i>Z</i><sub>26</sub>) was deeper than 100 m and warm eddies abounded. At the same time, prior to the storm’s arrival, an anomalous upper-level anticyclone developed south of Japan and created a weakened vertical wind shear (<i>V<sub>s</sub></i>) environment that extended into the Philippine Sea. This study examines how the rapid intensification of Typhoon Soudelor may be related to the observed variations of <i>Z</i><sub>26</sub>, <i>V<sub>s</sub></i> and other environmental fields as the storm crossed over them. A regression analysis indicates that the contribution to Soudelor’s intensity variation from <i>V<sub>s</sub></i> is the largest (62%), followed by <i>Z</i><sub>26</sub> (27%) and others. Further analyses using composites then indicate that the weak vertical wind shear produced by the aforementioned anomalous anticyclone is a robust feature in the western North Pacific during the developing summer of strong El Ninos with Oceanic Nino Index (ONI) > 1.5.https://www.mdpi.com/2073-4433/12/2/162typhoon rapid intensificationtropical cyclonesvertical wind shearupper-ocean warm eddies26 °C isothermEl Nino |
| spellingShingle | Leo Oey Yuchen Lin The Influence of Environments on the Intensity Change of Typhoon Soudelor Atmosphere typhoon rapid intensification tropical cyclones vertical wind shear upper-ocean warm eddies 26 °C isotherm El Nino |
| title | The Influence of Environments on the Intensity Change of Typhoon Soudelor |
| title_full | The Influence of Environments on the Intensity Change of Typhoon Soudelor |
| title_fullStr | The Influence of Environments on the Intensity Change of Typhoon Soudelor |
| title_full_unstemmed | The Influence of Environments on the Intensity Change of Typhoon Soudelor |
| title_short | The Influence of Environments on the Intensity Change of Typhoon Soudelor |
| title_sort | influence of environments on the intensity change of typhoon soudelor |
| topic | typhoon rapid intensification tropical cyclones vertical wind shear upper-ocean warm eddies 26 °C isotherm El Nino |
| url | https://www.mdpi.com/2073-4433/12/2/162 |
| work_keys_str_mv | AT leooey theinfluenceofenvironmentsontheintensitychangeoftyphoonsoudelor AT yuchenlin theinfluenceofenvironmentsontheintensitychangeoftyphoonsoudelor AT leooey influenceofenvironmentsontheintensitychangeoftyphoonsoudelor AT yuchenlin influenceofenvironmentsontheintensitychangeoftyphoonsoudelor |