WEKO3
アイテム
太平洋北赤道反流とその変動及びエルニーニョ現象に対する応答に関する研究
http://hdl.handle.net/20.500.12000/0002019585
http://hdl.handle.net/20.500.12000/00020195857aff4a8b-cffc-4afe-9c39-a8323e79cbdb
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rikoken422abstract.pdf (1 MB)
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rikoken422review.pdf (3.6 MB)
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rikoken422dijest.pdf (1.2 MB)
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| Item type | 琉球大学リポジトリ登録用アイテムタイプ(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-01-06 | |||||||
| タイトル | ||||||||
| タイトル | 太平洋北赤道反流とその変動及びエルニーニョ現象に対する応答に関する研究 | |||||||
| 言語 | ja | |||||||
| タイトル | ||||||||
| タイトル | Study on the Pacific North Equatorial Countercurrent, its variations, and its responses to the El Niño event | |||||||
| 言語 | en | |||||||
| 作成者 |
Yusuf, Jati Wijaya
× Yusuf, Jati Wijaya
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| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| 内容記述 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | The North Equatorial Countercurrent (NECC) is an eastward zonal current that establishes the low-latitude North Pacific Gyre. The NECC, which flows along the Pacific Ocean, has aroused the curiosity of scientists due to the likelihood that it may play a key role in the El Niño Southern Oscillation's (ENSO) evolution. ENSO has two phases: the warm period, which we call El Nino, and the cold phase, which we call La Nina. To explore the dominant mode of the NECC in each season, an empirical orthogonal function (EOF) approach was used in this study. Using geostrophic current data from altimetric satellites, we found that the NECC strengthened (weakened) during the developing phase of the El Niño (La Niña) event, which occurs mostly in boreal summer. The NECC magnitude decreased significantly as it entered the mature phase of El Nino, which occurs primarily in boreal winter. The movement of the NECC pathway to the north (south) was also seen when the magnitude was strengthening (weakening). In addition, the response of the NECC in the west and east of the dateline to three types of El Nino over 40 years (1978-2017) was carried out to analyze the differences. El Nino events are classified into three types: east pacific (EP), central pacific (CP), and a combination of both EP and CP (MIX). The results of this study showed that during the MIX El Nino period, the NECC was at its strongest in the west and east of the dateline. In the western Pacific Ocean, EP El Nino episodes usually induced a stronger NECC than CP El Nino episodes throughout the development phase, although it is difficult to detect with EOF analysis. In the mature phase, on the other hand, CP El Nino is detected more regularly, resulting in a greater NECC magnitude. Several oddities, such as episodes EP 1986/1987, CP 1987/1988, and CP 2002/2003, were identified during El Nino's unique years. In the east of the dateline, The NECC was considerably stronger during the EP and MIX El Niño than during the CP El Niño for the spring to fall, which are frequently linked with the development phase. In the mature phase, the NECC during the EP El Niño was weaker than the NECC during the CP and MIX El Niño. The movement of the western Pacific NECC to the south occurs in all types of El Nino events. The NECC east of the dateline, on the other hand, shifted northward during the mature phase of the CP and MIX episodes but not during the EP episodes. | |||||||
| 言語 | en | |||||||
| 出版者 | ||||||||
| 出版者 | 琉球大学 | |||||||
| 言語 | ja | |||||||
| 出版者 | ||||||||
| 出版者 | University of the Ryukyus | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| 出版タイプ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第422号 | |||||||
| 学位名 | ||||||||
| 言語 | ja | |||||||
| 学位名 | 博士（学術） | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2022-09-22 | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 18001 | |||||||
| 言語 | ja | |||||||
| 学位授与機関名 | 琉球大学 | |||||||
| 言語 | en | |||||||
| 学位授与機関名 | University of the Ryukyus | |||||||
