南カリフォルニア海流系における人為起源炭素侵入の時期
Timing of the anthropogenic carbon invasion in the Southern California Current (原題)
Yéssica Vanessa Contreras-Pacheco, J. L. Abella-Gutiérrez, Gerardo Vallejo Espinosa, Juan Carlos Herguera
🤖 gxceed AI 要約
日本語
バハ・カリフォルニア沖の高解像度堆積物コアを用い、過去150年の有機・無機炭素同位体比を分析した研究。過去70年間で炭素同位体比が軽くなる傾向を確認し、大気起源炭素（スース効果）がカリフォルニア海流の表層水に侵入していることを示唆する。大気記録より傾きが緩やかなのは、重い同位体を持つ亜表層水の湧昇混合と移流の影響と解釈される。東部境界湧昇域の全球炭素循環における役割の解明に寄与する。
English
Using 150-year sediment core records off Baja California, this study analyzes organic and inorganic carbon isotopes to track anthropogenic carbon uptake. A clear trend toward lighter isotopes over the past seven decades mirrors the atmospheric Suess effect, indicating atmospheric carbon invasion into southern California Current surface waters. The shallower slope versus atmospheric records is attributed to upwelling of heavier subsurface waters and advection. It improves characterization of Eastern Boundary Upwelling Systems in the global carbon cycle.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
海洋炭素吸収源の長期実証は、ブルーカーボンや海洋ベースの気候緩和策を議論する日本のGX文脈に基礎的知見を提供するが、直接的な政策・開示連動は弱い。
In the global GX context
Adds long-term empirical evidence on how coastal upwelling regions absorb anthropogenic carbon, relevant to blue-carbon accounting and ocean-based climate mitigation debates within the global carbon cycle and IPCC framing.
👥 読者別の含意
🔬研究者:東部境界湧昇域の炭素吸収源・源機能の長期変動を同位体で定量化する手法と知見を提供する。
🏛政策担当者:海洋炭素吸収源の評価やブルーカーボン政策の科学的基礎として参照可能。
📄 Abstract（原文）
Abstract. The role of Eastern Boundary Upwelling Systems (EBUS), such as the southern California Current System, is a well-known high productivity region driven by alongshore winds, although their role as atmospheric carbon sources and sinks is poorly understood in the global carbon cycle. In the southern CCS, off Baja California, wind-driven vertical mixing upwells nutrient and carbon-rich waters from late winter to early summer, while weaker winds during the rest of the year allow the intrusion of nutrients and carbon-depleted subtropical surface waters. Here, we interpret the isotopic composition of organic carbon and calcitic records spanning 150 years from high-resolution sediment cores collected off Baja California in the context of seasonal variability observed between 1990 and 2011. The results show a clear trend toward lighter carbon isotopic compositions of the organic and inorganic carbon for the past seven decades. These trends are similar to the atmospheric records associated with the Suess effect, suggesting an atmospheric carbon invasion into the surface waters of the California Current. Nevertheless, the slope of the atmospheric carbon isotopic records is steeper than our marine record, most likely related to the upward mixing of subsurface waters with a relatively heavier carbon isotopic signature and advection processes inherent to the strong seasonality of the CCS southern boundary. These results will allow a better characterization of the relative role of the EBUS regions in the global carbon cycle.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.5194/bg-23-7397-2026first seen 2026-10-26 04:50:55 · last seen 2026-11-05 05:19:14
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