[P-EM11] Space Weather and Space Climate

[PEM11-P16] Annual ¹⁰Be record in travertine covering 1510-1701: a new proxy for reconstructing annual solar activity

Xu Hongyang²、*宮原 ひろ子¹、堀内 一穂³、松崎 浩之⁴、Zhao Xi²、Gan Hailing²、Luo Weijun⁵、Meadows Michael⁶、Zheng Xiangmin²、Zhou Limin² (1.武蔵野美術大学造形学部、2.華東師範大学、3.弘前大学、4.東京大学、5.中国科学院、6.ケープタウン大学)

キーワード：トラバーチン、宇宙線生成核種、太陽活動、銀河宇宙線、ベリリウム10

Previous research has revealed that the ¹⁰Be record in laminated travertine has significant potential for reconstructing past high-resolution solar activity. However, the depositional processes of atmospheric ¹⁰Be into travertine have not been fully resolved, and thus the methodology for extracting the production signal has not been established. In this study, we present an annually resolved ¹⁰Be record from Baishuitai travertine covering 1510-1701 CE, along with environmental proxies, discuss the potential influence of climatic/environmental variations on the travertine ¹⁰Be record, and propose an improved correction methodology for extracting the atmospheric ¹⁰Be production signal from the travertine. We show that ¹⁰Be deposition in travertines has two environmental impacts: the transport efficiency of atmospheric ¹⁰Be into travertine and the additional ¹⁰Be inflow from overland flow caused by rainfall. We demonstrate that these effects can be corrected based on iron and potassium contents and that the resulting corrected record reasonably agrees with ice-core and tree-ring data, indicating that ¹⁰Be in travertine can be a good proxy for probing the past annual solar activity.