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Tree-ring record of winter temperature from Humla, Karnali, in central Himalaya: a 229 years-long perspective for recent warming trend
Geografiska Annaler: Series A, Physical Geography ( IF 1.4 ) Pub Date : 2020-04-23 , DOI: 10.1080/04353676.2020.1751446
Narayan Prasad Gaire 1, 2 , Ze-Xin Fan 1 , Santosh K. Shah 3 , Uday Kunwar Thapa 4 , Maan Bahadur Rokaya 5, 6
Affiliation  

ABSTRACT Tree rings are widely used to reconstruct past climates in regions where observational records of climate are short. In this study, we developed a 294 years-long (1718–2011 CE) ring-width chronology of the Himalayan Silver fir (Abies spectabilis (D.Don, Spach)) from Humla district in western Nepal to reconstruct winter minimum temperature for the remote region of central Himalaya where instrumental records are limited to past three or four decades. Ring-width chronology of the Himalayan Silver fir showed strongest and significant positive correlation with minimum winter temperature prior to the growing season. Based on this relationship, we reconstructed the winter season (previous October–current February) minimum temperature for western Nepal covering the period of 1780–2008 CE. Our reconstruction showed that winter minimum temperature is continuously increasing since the early twentieth century with unprecedented rapid warming in the latter half. The cold episodes in the reconstruction coincided with the major volcanic eruptions in the Northern Hemisphere and tropical regions. The spectral analysis using Multi-Taper Method revealed that the winter temperature in the north-western Himalaya has short- to medium-term periodicities of 2–3, 5.8–6.2, 7.9–8.2, 39–46 and 56–73 years, which suggest possible teleconnections with ENSO (El-Nino Southern Oscillation) and AMO (Atlantic Multidecadal Oscillation).

中文翻译:

喜马拉雅中部卡纳利胡姆拉冬季气温的年轮记录:229 年近期变暖趋势的视角

摘要 在气候观测记录较少的地区,树木年轮被广泛用于重建过去的气候。在这项研究中,我们开发了尼泊尔​​西部 Humla 区喜马拉雅银杉 (Abies spectabilis (D.Don, Spach)) 长达 294 年(公元 1718 年至 2011 年)的环宽年表,以重建尼泊尔西部的冬季最低气温。喜马拉雅中部偏远地区,仪器记录仅限于过去三四年。喜马拉雅银杉的环宽年表与生长季节之前的最低冬季温度呈最强且显着的正相关。基于这种关系,我们重建了 1780 年至 2008 年期间尼泊尔西部的冬季(前 10 月至当前 2 月)最低气温。我们的重建表明,自 20 世纪初以来,冬季最低气温持续升高,下半叶出现前所未有的快速升温。重建中的寒冷事件恰逢北半球和热带地区的主要火山爆发。多锥度法光谱分析表明,喜马拉雅西北部冬季气温具有 2-3 年、5.8-6.2 年、7.9-8.2 年、39-46 年和 56-73 年的中短期周期性。建议与 ENSO(厄尔尼诺南方涛动)和 AMO(大西洋多年代际涛动)可能的遥相关。重建中的寒冷事件恰逢北半球和热带地区的主要火山爆发。多锥度法光谱分析表明,喜马拉雅西北部冬季气温具有 2-3 年、5.8-6.2 年、7.9-8.2 年、39-46 年和 56-73 年的中短期周期性。建议与 ENSO(厄尔尼诺南方涛动)和 AMO(大西洋多年代际涛动)可能的遥相关。重建中的寒冷事件恰逢北半球和热带地区的主要火山爆发。多锥度法光谱分析表明,喜马拉雅西北部冬季气温具有 2-3 年、5.8-6.2 年、7.9-8.2 年、39-46 年和 56-73 年的中短期周期性。建议与 ENSO(厄尔尼诺南方涛动)和 AMO(大西洋多年代际涛动)可能的遥相关。
更新日期:2020-04-23
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