Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL077666 |
Interdecadal Sea Level Variations in the Pacific: Distinctions Between the Tropics and Extratropics | |
Merrifield, M. A.1; Thompson, P. R.2 | |
2018-07-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:13页码:6604-6610 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Long tide gauge records from Fremantle and San Diego are used to examine interdecadal sea level fluctuations and their relationship to Pacific climate variability. The sea level difference between the tide gauges and the Southern Oscillation Index (SOI) provide a consistent depiction of trade wind variations along the equator over the past century. The sea level difference and SOI exhibit weak interdecadal variability prior to the late 1970s, followed by an extended 40-year period of high levels at San Diego and low at Fremantle, and low SOI levels signifying weakened equatorial trade winds. By referencing the tide gauge records to global mean sea level, we infer that Pacific trade winds exhibited weak departures from mean conditions on interdecadal time scales prior to the late 1970s and that a prolonged El Nino-like lull dominated the tropics at the end of the century. A recent shift suggests that the trades are reverting back to the El Nino-like state. These tropical interdecadal variations have counterparts in the extratropical North Pacific after the 1970s, as captured by the Pacific Decadal Oscillation, but the early twentieth century quiescent phase in the tropical Pacific is not reflected in the extratropics, which exhibits more energetic oscillatory behavior over the same time span. Plain Language Summary Long tide gauge records from Fremantle and San Diego provide a measure of interdecadal variations in trade wind forcing that impacts both locations. The records indicate substantial interdecadal sea level variation after the 1970s caused by a prolonged relaxation of the Pacific trade winds. Sea level and trade wind variations of this sort were considerably weaker earlier in the century. Measures of interdecadal climate variations in the extratropical North Pacific covaried with the trade winds after the 1970s, but the correspondence breaks down early in the century when tropical winds were near normal and the extratropics exhibited energetic interdecadal variability. The findings support previous studies that emphasize that the tropical and extratropical Pacific are not always in sync at these time scales, which has ramifications for understanding the underlying drivers of these variations as well as for decadal climate prediction. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439784300031 |
WOS关键词 | SURFACE-TEMPERATURE ; CLIMATE VARIABILITY ; NORTH PACIFIC ; EQUATORIAL PACIFIC ; HEMISPHERE ; ENSO ; OSCILLATION ; MECHANISMS ; FREMANTLE ; AMERICA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27836 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA; 2.Univ Hawaii Manoa, Dept Oceanog, Honolulu, HI 96822 USA |
推荐引用方式 GB/T 7714 | Merrifield, M. A.,Thompson, P. R.. Interdecadal Sea Level Variations in the Pacific: Distinctions Between the Tropics and Extratropics[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(13):6604-6610. |
APA | Merrifield, M. A.,&Thompson, P. R..(2018).Interdecadal Sea Level Variations in the Pacific: Distinctions Between the Tropics and Extratropics.GEOPHYSICAL RESEARCH LETTERS,45(13),6604-6610. |
MLA | Merrifield, M. A.,et al."Interdecadal Sea Level Variations in the Pacific: Distinctions Between the Tropics and Extratropics".GEOPHYSICAL RESEARCH LETTERS 45.13(2018):6604-6610. |
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