Interannual and decadal variability of the western Pacific sea surface condition for the years 1787-2000: Reconstruction based on stable isotope record from a Guam coral
Interannual and decadal variability of the western Pacific sea surface condition for the years 1787-2000: Reconstruction based on stable isotope record from a Guam coral
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DOI：
10.1029/2004jc002555
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发表时间：
2005-05-27
影响因子：
3.6
通讯作者：
Paulay, G
中科院分区：
文献类型：
--
作者：
Asami, R;Yamada, T;Paulay, G
[ 1]我们提供了一个来自关岛（北纬13度，东经145度）珊瑚的213年稳定同位素时间序列，该珊瑚位于西太平洋暖池的北方边缘。氧同位素组成的珊瑚骨骼（三角洲O-18（珊瑚））显示季节性，年际和十年的变化，记录显着的海洋变化有关的热和水文变化在这一地区。三角洲O-18（珊瑚）异常反映了海表温度（SST）异常和海表盐度（SSS）异常，r值分别为-0.69和0.49，这与厄尔尼诺-南方涛动（ENSO）暖相和冷相期间发生的海洋变化密切相关。我们在珊瑚记录中识别出46个ENSO暖相（El Nino）和53个冷相（La Nina），这与Nino 3.4 SST异常重建的相一致。1790 - 1999年三角洲O-18（珊瑚）异常记录的光谱分析确定了大约3年到7年的显著峰值。这些结果表明，关岛珊瑚记录了厄尔尼诺/南方涛动的周期性。三角洲O-18（珊瑚）异常显示出类似于15年至45年周期的十年变化，从温暖到凉爽的条件有显着的变化（< 0.2%），反之亦然。三角洲O-18（珊瑚）时间序列的累积减少可能意味着在过去的200年里，热带西北太平洋的SST变暖了0.75摄氏度，海水三角洲O-18的淡化了0.23千分之一，对应于SSS减少了0.85。
[ 1] We present a monthly resolved, 213-year stable isotope time series from a coral from Guam (13 degrees N, 145 degrees E), which is located on the northern edge of the western Pacific warm pool. Oxygen isotopic composition of the coral skeleton (delta O-18(coral)) shows seasonal, interannual, and decadal variability, which documents significant oceanographic changes related to thermal and hydrologic variations in this region. The delta O-18(coral) anomaly reflects sea surface temperature (SST) anomaly and sea surface salinity (SSS) anomaly with significant r values of - 0.69 and 0.49, respectively, which are strongly linked to oceanographic changes that occur during El Nino - Southern Oscillation (ENSO) warm and cool phases. We identified 46 ENSO warm ( El Nino) and 53 cool phases ( La Nina) in the coral record, which are consistent with those phases reconstructed by Nino 3.4 SST anomaly. Spectral analyses of the delta O-18(coral) anomaly record for the years 1790 - 1999 identified significant peaks around similar to 3 to similar to 7 years. These results indicate that the Guam coral has recorded ENSO periodicity. The delta O-18(coral) anomaly shows decadal variability of similar to 15- to similar to 45-year periodicity with significant shifts (< 0.2%) from warmer to cooler condition and vice versa. An accumulative decrease in delta O-18(coral) time series may imply similar to 0.75 degrees C warming of SST and similar to 0.23 parts per thousand freshening of seawater delta O-18, corresponding to a decrease of SSS by similar to 0.85, in the northwestern tropical Pacific over the last 2 centuries.