Siberian Federal University, Svobodny pr. 79, 660041, Krasnoyarsk, Russia.
Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, 8903, Birmensdorf, Switzerland.
Sci Rep. 2022 May 11;12(1):7752. doi: 10.1038/s41598-022-11299-1.
Temperature and precipitation changes are crucial for larch trees growing at high-elevation sites covered by permafrost in the Altai-Sayan mountain range (ASMR). To contextualize the amplitude of recent climate fluctuations, we have to look into the past by analyzing millennial paleoclimatic archives recording both temperature and precipitation. We developed annually resolved 1500-year tree-ring cellulose chronologies (δC, δO), and used these new records to reconstruct the variability in local summer precipitation and air temperature. We combined our new local reconstructions with existing paleoclimatic archives available for the Altai. The data show a strong decreasing trend by ca. 49% in regional summer precipitation, along with a regional summer temperature increase towards the twenty-first century, relative to the preceding 1500 years. Modern dry conditions (1966-2016 CE) in the ASMR are the result of simultaneous summer warming and decreased precipitation. Our new reconstructions also demonstrate that climate change in the ASMR is much stronger compared to the global average.
温度和降水变化对于生长在阿尔泰山-萨彦山脉（ASMR）多年冻土覆盖的高海拔地区的落叶松至关重要。为了了解最近气候波动的幅度，我们必须通过分析记录温度和降水的千年古气候档案来了解过去。我们开发了分辨率为年的 1500 年树木年轮纤维素年表（δC、δO），并使用这些新记录来重建当地夏季降水和气温的变化。我们将新的本地重建与阿尔泰现有的古气候档案相结合。数据显示，与前 1500 年相比，区域夏季降水约减少了 49%，同时区域夏季温度在 21 世纪呈上升趋势。ASMR 现代干旱条件（1966-2016 年）是夏季变暖与降水减少同时发生的结果。我们的新重建也表明，与全球平均水平相比，ASMR 的气候变化要强得多。
