2026-04-28 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/research-news/202604/t20260428_1158215.shtml
- https://link.springer.com/article/10.1007/s11676-026-02046-7
1844年以降の年ごとの相対湿度復元により、中国南東部黄土高原で前例のない干ばつ（1997年～2023年）が発生したことが明らかになった Annually resolved relative humidity reconstruction since 1844 CE reveals unprecedented drought (1997–2023 CE) in the southeastern Chinese Loess Plateau
Dan Chen,Qiufang Cai,Yu Liu,Mei Xie,Kebayier Meng,Meng Ren,Qiang Li,Changfeng Sun,Huiming Song & Jun Zhao
Journal of Forestry Research Published:08 April 2026
DOI:https://doi.org/10.1007/s11676-026-02046-7
Abstract
Relative humidity (RH) plays a crucial role in maintaining both forest and human health. However, the historical characteristics and drivers of RH in the southeastern Chinese Loess Plateau (SECLP) remain poorly understood. Here, a high-resolution tree-ring-width record from the SECLP reveals that the radial growth of Pinus tabuliformis is limited by RH from April to mid-August (RHc10–23), which coincides with the period from the Chinese solar term Pure Brightness to End of Heat. The 180-year RHc10–23 reconstruction explains 45.40% of instrumental variance (1956–2020 CE) and reveals a long-term drying trend since 1844 CE, especially evident since 1956 CE. Three iconic Northern China droughts—the ~ 1900, late-1920s, and 1940–1943 events—are clearly resolved, together with an unprecedented 1997–2023 drought. Conversely, wet periods occurred during 1850–1890, 1910–1916, and 1951–1966 CE. The reconstruction mirrors broad Chinese Loess Plateau hydroclimatic patterns while retaining local signals. Over the past two centuries, SECLP hydroclimatic variations have been anti-correlated with regional temperature and modulated by the Asian summer monsoon, Atlantic Multidecadal Oscillation/Atlantic Multidecadal Variability, El Niño-Southern Oscillation, and Indian Ocean Dipole. This study enhances our understanding of regional hydroclimatic evolution, highlights human impacts on natural systems, and provides scientific support for climate change adaptation and water resource management.
