泛第三极环境与绿色丝路

基于树轮宽度的澜沧江源区干旱重建

  • 黄小梅 ,
  • 肖丁木 ,
  • 秦宁生
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  • 1.中国气象局成都高原气象研究所/高原与盆地暴雨旱涝灾害四川省重点实验室,四川 成都 610072;
    2.四川省气象台,四川 成都 610072;
    3.四川省气候中心,四川 成都 610072
黄小梅(1987-),女,助理研究员,硕士,主要研究方向为青藏高原气候变化和气候诊断. E-mail: hxmlovely@163.com
秦宁生. E-mail: qinns0515@163.com

收稿日期: 2018-06-27

  修回日期: 2018-09-27

  网络出版日期: 2025-10-18

基金资助

国家自然科学基金(41772173);中国沙漠气象科学研究基金(Sqj2016002)

Drought Reconstruction Based on Tree-Ring Width in Headwaters of the Lancang River

  • HUANG Xiao-mei ,
  • XIAO Ding-mu ,
  • QIN Ning-sheng
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  • 1. Chengdu Institute of Plateau Meteorology, CMA/Sichuan Provincial Key Laboratory for Heavy Rain and Drought-Flood Disasters in Plateau and Basin, Chengdu 610072, Sichuan,China;
    2. Sichuan Provincial Meteorological Observatory, Chengdu 610072, Sichuan,China;
    3. Sichuan Provincial Climate Center, Chengdu 610072, Sichuan,China

Received date: 2018-06-27

  Revised date: 2018-09-27

  Online published: 2025-10-18

摘要

依据采自青海省杂多县昂赛乡的树轮样本,建立树轮宽度差值年表(RES)。相关普查表明,澜沧江源区6—7月平均的12个月时间尺度标准化降水蒸散指数(SPEI)与RES年表具有显著的正相关。利用RES年表重建了澜沧江源区1639—2013年6—7月平均的SPEI变化序列,重建方程方差解释量达到37.4%,且经过交叉检验证明了方程的稳定性。重建序列展示了澜沧江源区干旱的长期变化情况,发现1694—1710、1753—1778、1830—1847、1862—1872、1892—1908、1919—1929、1978—1989年共7个偏湿阶段和1646—1673、1682—1693、1711—1731、1735—1752、1796—1809、1817—1829、1848—1861、1873—1886、1949—1959、1990—2000年10个偏干阶段。重建的SPEI序列存在30~64、19~21、4.2~4.3、2.6~3.2、2.5 a和2.2 a左右的显著变化周期。相关分析表明,赤道中东太平洋海温对澜沧江源区干湿变化具有显著影响。此外,澜沧江源区干湿变化可能与厄尔尼诺-南方涛动(ENSO)、太平洋年代际振荡(PDO)、太阳活动等大尺度的气候驱动因子存在一定的联系。此次SPEI重建为澜沧江源区提供了长期干旱变化历史,可为该区水资源管理提供科学依据。

本文引用格式

黄小梅 , 肖丁木 , 秦宁生 . 基于树轮宽度的澜沧江源区干旱重建[J]. 干旱区研究, 2019 , 36(2) : 280 -289 . DOI: 10.13866/j.azr.2019.02.02

Abstract

Tree-ring width residual chronology (RES) was developed from the tree-ring samples collected in Angsai Township, Zaduo County, Qinghai Province. The results of general survey showed that there was a high correlation between the tree-ring width chronology and the SPEI (June-July) at 12-month time scale. The June-July SPEI in the headwaters of the Lancang River was reconstructed from AD 1639 to 2013, and it was used to explain the 37.4% of the total SPEI variance during their common period. The cross-validation revealed that the reconstructed equation was stable. The results showed that the relatively wet periods occurred during 1694-1710, 1753-1778, 1830-1847, 1862-1872, 1892-1908, 1919-1929 and 1978-1989, and the relatively dry periods occurred during 1646-1673, 1682-1693, 1711-1731, 1735-1752, 1796-1809, 1817-1829, 1848-1861, 1873-1886, 1949-1959 and 1990-2000, respectively. The reconstructed SPEI series revealed that there were the significant variation periods of 30-64, 19-21, 4.2-4.3, 2.6-3.2, 2.5 and 2.2 years. Correlation analysis showed that the sea surface temperature in the middle-east equator Pacific Ocean affected significantly the dry-wet changes in the headwaters of the Lancang River. Our reconstruction was associated with the large-scale atmospheric-oceanic variability, such as the El Nio-Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO) and solar activity. This SPEI reconstruction could provide a long-term drought history in the headwaters of the Lancang River and serve as the scientific basis for water resources management in this semiarid region.

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