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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Scaling factors for production rates of in situ produced cosmogenic nuclides: a critical reevaluation
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Scaling factors for production rates of in situ produced cosmogenic nuclides: a critical reevaluation

机译：原位产生的宇宙成因核素生产率的比例因子：关键的重新评估

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摘要

New scaling factors are presented describing the altitude and latitudinal dependence of production rates for in situ produced cosmogenic nuclides. The new factors incorporate the influence of the non-dipole contributions to the geomagnetic field on the cosmic ray flux. The currently used scaling factors of Lal [Earth Planet. Sci. Lett. 104 (1991) 424-439] are based on the assumption of a dipole field. The overall strategy used in deriving the new scaling factors is, however, very similar to that of Lal and relies on the same and/or similar nuclear data. In this reevaluation, data are only used if the effective geomagnetic parameters (inclination, horizontal field strength) can be reconstructed for the time of measurement. The absorption free pathlengths Λ for cosmic rays selected for this study are based on observational data at altitudes relevant for exposure age dating (sea level to 7000 m). At sea level and latitudes between 20 °and 40 °, the new factors are up to 18% lower and at high altitudes more than 30% higher than those of Lal. In addition to accounting for the influence of the effective geomagnetic field and providing more applicable estimates of Λ, the new factors also allow for correction for the significant deviations from the standard pressure-altitude relationship that exist in the atmosphere (≤10%).
机译：提出了新的比例因子，描述了原位产生的宇宙成因核素的海拔高度和生产速率的纬度依赖性。新的因素结合了非偶极子对地磁场的影响对宇宙射线通量的影响。 Lal [Earth Planet。科学来吧104（1991）424-439]是基于偶极场的假设。但是，用于推导新比例因子的总体策略与Lal非常相似，并且依赖于相同和/或相似的核数据。在此重新评估中，仅当可以在测量时重构有效的地磁参数（倾角，水平磁场强度）时才使用数据。为这项研究选择的宇宙射线的无吸收自由光长度Λ是基于与暴露年龄测算（海平面至7000 m）有关的海拔高度的观测数据。在海平面和20°至40°之间的纬度下，新因子比拉尔低18％，在高海拔比拉尔高30％以上。除了考虑有效地磁场的影响并提供更适用的Λ估计值外，新因素还可以校正与大气中存在的标准压力-高度关系的重大偏差（≤10％）。

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