A tephra-based approach to calibrating relative geomagnetic paleointensity stacks to absolute values
A tephra-based approach to calibrating relative geomagnetic paleointensity stacks to absolute values
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基于火山灰的方法将相对地磁古强度堆栈校准为绝对值
DOI：
10.1016/j.epsl.2021.117119
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发表时间：
2021
影响因子：
5.3
通讯作者：
Shibuya Hidetoshi
中科院分区：
文献类型：
--
作者：
Mochizuki Nobutatsu;Fujii Satomu;Hasegawa Takeshi;Yamamoto Yuhji;Hatakeyama Tadahiro;Yamashita Daisuke;Okada Makoto;Shibuya Hidetoshi
相对古强度（RPI）叠加提供了一个相对的，全球性的古强度变化，反映了地心轴向偶极矩的变化。RPI叠加的先前校准依赖于将平均RPI调整为虚拟轴向偶极矩（VADM）的平均值，所述VADM选自绝对古强度（API）数据库。为了实现RPI叠加到绝对值的更定量校准，我们提出了一种新的方法，该方法比较（1）火山岩衍生的API和（2）相同火山岩的层位，在氧同位素地层学中，绑定RPI（以下称为“TA-TOR”方法）。对于TA-TOR方法，API是新确定的焊接凝灰岩的15个火山碎屑流沉积在日本。15个新API中的8个和2个先前报道的API在氧同位素地层学中具有火山灰层位。基于TA-TOR方法的10个数据，结合4个过渡场数据，将从API计算的VADs（VADs）与来自两个RPI堆栈PISO-1500和Sint-2000的等熵RPI进行比较。RPI与VADMAP PI图中的14个数据点显示线性关系，相关系数为0.83-0.89。使用所观察到的线性关系，两个RPI堆栈可靠地校准到VADM值（VADMRPI）自1.1 Ma以来的时期。与先前研究校准的VADMs相比，本校准提供了12-13%的更小的中位数/平均值和更大的离散度，如两个RPI堆栈的15-53%的更大标准差所示。从两个堆栈的VADMRPI的累积分布和那些从API数据库中选择的VADMs之间的相似性表明，本校准的可靠性。这些结果表明，目前的校准，它依赖于TA-TOR的方法，准确地转换成VADMRPI值的RPI堆栈，并将有助于在地心轴向偶极矩的时间变化的研究，沉积RPI，宇宙成因的放射性核素。通过本校准从PISO-1500和Sint-2000获得的过去110万年VADMRPI的变化，可以用作这一时期的标准地心轴向偶极子变化。
Relative paleointensity (RPI) stacks provide a relative, global paleointensity variation, which reflects variations in the geocentric axial dipole moment. Previous calibrations of an RPI stack rely on adjusting a mean RPI to a mean of virtual axial dipole moments (VADMs), which are selected from absolute paleointensity (API) databases. To achieve more quantitative calibration of an RPI stack into absolute values, we propose a novel approach that compares (1) tephra-derived APIs and (2) the same tephras' horizons, in the oxygen isotope stratigraphy, tied RPIs (hereafter termed the “TA-TOR” approach). For the TA-TOR approach, APIs were newly determined for welded tuffs of 15 pyroclastic flow deposits in Japan. Eight of the 15 new APIs and 2 previously reported APIs have tephra horizons in the oxygen isotope stratigraphy. Based on the 10 data of the TA-TOR approach, combined with 4 data of the transitional field, VADMs calculated from the APIs (VADMAPI) were compared with isochronous RPIs from two RPI stacks, PISO-1500 and Sint-2000. The 14 data points in RPI vs. VADMAPIdiagrams show a linear relationship with correlation coefficients of 0.83–0.89. Using the observed linear relationships, the two RPI stacks were reliably calibrated to VADM values (VADMRPI) for the period since 1.1 Ma. Compared with the VADMs calibrated by the previous studies, the present calibration provides a 12–13% smaller median/mean and a larger dispersion as represented by a 15–53% larger standard deviation for the two RPI stacks. The similarities between the cumulative distributions of VADMRPIfrom the two stacks and those of VADMs selected from the API database indicate the reliability of the present calibration. These results show that the present calibration, which relies on the TA-TOR approach, accurately converts a RPI stack into VADMRPIvalues and will contribute to studies on time variations in the geocentric axial dipole moment, sedimentary RPI, and cosmogenic radionuclides. Variations in VADMRPIfor the past 1.1 Myr, obtained from PISO-1500 and Sint-2000 via the present calibration, can be used as standard geocentric axial dipole variations for this period.
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影响因子：
3.9
作者：
T. Sakamoto;M. Ikehara;M. Uchida;K. Aoki;Y. Shibata;T. Kanamatsu;N. Harada;K. Iijima;K. Katsuki;H. Asahi;Kozo Takahashi;H. Sakai;H. Kawahata
通讯作者：
T. Sakamoto;M. Ikehara;M. Uchida;K. Aoki;Y. Shibata;T. Kanamatsu;N. Harada;K. Iijima;K. Katsuki;H. Asahi;Kozo Takahashi;H. Sakai;H. Kawahata
影响因子：
--
作者：
N. Mochizuki;H. Oda;O. Ishizuka;T. Yamazaki;H. Tsunakawa
通讯作者：
N. Mochizuki;H. Oda;O. Ishizuka;T. Yamazaki;H. Tsunakawa
影响因子：
3.7
作者：
T. Yamazaki;H. Oda
通讯作者：
T. Yamazaki;H. Oda
影响因子：
3
作者：
Biggin, Andrew J.;Strik, Geert H. M. A.;Langereis, Cor G.
通讯作者：
Langereis, Cor G.
- 仙台和原町的数值气候分析 - 基于热平衡分析的城市气候形成机制比较
DOI：
--
发表时间：
2004
期刊：
日本建築学会東北支部研究報告集 計画系 No.67
影响因子：
--
作者：
吉田智弘;吉田智弘
通讯作者：
吉田智弘