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首页> 外文期刊>Paleoceanography >Interdecadal-decadal climate variability from multicoral oxygen isotope records in the South Pacific Convergence Zone region since 1650 A.D.
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Interdecadal-decadal climate variability from multicoral oxygen isotope records in the South Pacific Convergence Zone region since 1650 A.D.

机译：自公元1650年以来南太平洋收敛带地区多珊瑚氧同位素记录的年代际年代际变化。

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[1] In the South Pacific, interdecadal-decadal oceanic and atmospheric variability, referred to as the Interdecadal Pacific Oscillation (IPO), is most pronounced in the South Pacific Convergence Zone (SPCZ) salinity front region. Here we have used annual average oxygen isotope (delta O-18) time series from five coral cores collected from Fiji and Tonga in this region to construct a Fiji-Tonga Interdecadal-Decadal Pacific Oscillation (F-T IDPO) index of low-frequency (> 9 and < 55 years) climate variability back to 1650 A. D. We first demonstrate the consistency between this F-T IDPO index and a mean sea level (MSL) pressure-based SPCZ position index (SPI) (1891-2000), thus verifying the ability of coral delta O-18 to record past interdecadal-decadal climatic variations in this region back to 1891. The F-T IDPO index is then shown to be synchronous with the IPO index (1856-2000), suggesting that this coral-based index effectively represents the interdecadal-decadal scale climate variance back to 1650. The regularity of the F-T IDPO index indicates that interdecadal-decadal variability in the SPCZ region has been relatively constant over the past 350 years with a mean frequency of similar to 20 years (variance peaks near 11 and 35 years). There is a consistent antiphase correlation of the F-T IDPO index and the interdecadal-decadal components in equatorial Pacific coral delta O-18 series from Maiana and Palmyra. This observation indicates that the eastward expansion ( westward contraction) of the eastern salinity front of the Western Pacific Warm Pool (WPWP) occurs simultaneously (+/-<= 1 year) with the westward ( eastward) shift of the SPCZ salinity front during positive IPO ( negative IPO) phases. This is the same relationship observed during the phases of the El Nino Southern Oscillation.
机译：[1]在南太平洋，年代际-年代际海洋和大气变化，被称为年代际太平洋涛动（IPO），在南太平洋汇聚区（SPCZ）盐度前沿地区最为明显。在这里，我们使用了从该地区的斐济和汤加采集的五个珊瑚核的年度平均氧同位素（δO-18）时间序列，来构建低频（>>的斐济-汤加年代际-年代际太平洋涛动（FT IDPO）指数9和<55年）的气候变化可追溯到公元1650年。我们首先证明了该FT IDPO指数与基于平均海平面（MSL）压力的SPCZ位置指数（SPI）（1891-2000）之间的一致性，从而验证了珊瑚三角洲O-18记录了该地区过去十年间的年代际气候变化，可追溯到1891年。然后显示FT IDPO指数与IPO指数（1856-2000）是同步的，表明该基于珊瑚的指数有效地代表了年代际到年代际尺度的气候变化可追溯到1650年。FTIDPO指数的规律性表明，在过去350年中，SPCZ地区的年代际到年代际变化一直相对稳定，平均频率接近20年（变化pe大约11和35年）。在Maiana和Palmyra的赤道太平洋珊瑚三角洲O-18系列中，F-T IDPO指数与年代际和年代际成分之间存在一致的反相相关性。该观察结果表明，西太平洋暖池（WPWP）东部盐度锋向东扩展（向西收缩）在正值期间与SPCZ盐度锋向西（向东）移动同时发生（+/- <= 1年） IPO（负IPO）阶段。这是在厄尔尼诺南方涛动阶段观察到的相同关系。

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