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Postbomb Subtropical North Pacific Surface Water Radiocarbon History
Journal of Geophysical Research: Oceans ( IF 3.6 ) Pub Date : 2021-01-17 , DOI: 10.1029/2020jc016881
Thomas P. Guilderson 1 , Daniel P. Schrag 2 , Ellen R. M. Druffel 3 , Ron W. Reimer 4
Affiliation  

We have generated a high‐resolution coral Δ14C record from the leeward side of the Big Island of Hawai’i in the subtropical North Pacific. The record spans 1947–1992, when the coral was collected, and includes a brief prebomb interval as well as the postbomb era. Mean prebomb (1947–1954) values average −55‰ (±1, SE of the mean) with a clear seasonal cycle. Values are less positive during winter when vertical exchange mixes surface and lower‐14C subsurface waters. The postbomb annual maximum occurs in 1971 (+160‰) and decreases in a series of shifts to +105‰ in 1991, the end of our coral‐based reconstruction. The decrease is not monotonic and has inflection points during the La Niña years of 1973, 1977, and 1984. Imbedded in the Δ14C record is interannual variability in the El Nino‐Southern Oscillation band which is interpreted to reflect the lateral advection of low latitude surface waters as part of the oceanic Hadley Cell driven by Sverdrup dynamics.

中文翻译:

炸弹后亚热带北太平洋地表水放射性碳的历史

我们已经产生了高分辨率的珊瑚Δ 14从夏威夷大岛的中亚热带北太平洋的风C侧记录。记录跨度为1947-1992年,当时收集了珊瑚,包括短暂的炸弹前间隔和炸弹后时代。平均前炸弹(1947-1954)的值平均为-55‰(±1,平均值的标准误差),具有清晰的季节性周期。在冬季,垂直交换将地表水和14 C以下的地下水混合时,该值的正值较小。炸弹爆发后的年度最大值发生在1971年(+ 160‰),并在一系列变化中逐渐减少,在1991年以珊瑚为基础的重建工作结束时降至+ 105‰。下降不是单调的,并在拉尼娜年的1973年,1977年,1984年和在Δ嵌入具有拐点14C记录是厄尔尼诺-南方涛动带的年际变化,这被解释为反映了低纬度地表水的横向对流,这是由Sverdrup动力学驱动的海洋Hadley细胞的一部分。
更新日期:2021-02-15
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