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首页> 外文期刊>Chinese science bulletin >Tree-ring based PDSI reconstruction since AD 1842 in the Ortindag Sand Land, east Inner Mongolia
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Tree-ring based PDSI reconstruction since AD 1842 in the Ortindag Sand Land, east Inner Mongolia

机译：内蒙古东部奥丁达格沙地自1842年以来基于树木年轮的PDSI重建

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Based on three Chinese pine (Pinus tabulaeformis Carr.) and one Meyer spruce (Picea meyeri Rehd. et Wils.) ring-width chronologies, a 163-year drought history was reconstructed in the eastern Ortindag Sand Land. All tree-ring chronologies show large inter-annual variations and strong common signals and fairly consistent variation between different chronologies, indicating that they are excellent proxy of regional climate. A regional chronology (RC) was established by averaging the four standard chronologies and further employed for the analysis and climatic reconstruction. The analysis revealed that tree growth is primarily limited by low precipitation in February—March and June—July and high temperature in May—July. In addition, RC has high correlations with the monthly Palmer drought severity index (PDSI) prior to and during the growing season because the PDSI considers the accumulation of the droughts. Response function analysis revealed that RC only exhibits significant correlations with the PDSI in June and July (close to the 95% significance level in May). Because May—July is a critical period for tree growth, the average May—July PDSI (PDSI_(5-7)) was reconstructed back to 1842 using RC in the Ortindag Sand Land. The reconstruction can explain 52% of the PDSI variance and the equation was rather stable over time. It agrees well with the variation of the average dryness/wetness indices in North China, and captures the decline process of the East Asian summer monsoon since the mid-1960s. It is worth noting that the Ortindag Sand Land has experienced the most severe drought in the recent 40 years based on the 163-year drought reconstruction. Like summer precipitation in North China the reconstructed PDSI_(5-7) also displays a 20-year oscillation.
机译：根据三棵中国松（Pinus tabulaeformis Carr。）和一棵迈耶云杉（Picea meyeri Rehd。et Wils。）环宽年表，在东部奥丁达格沙地重建了163年的干旱历史。所有年轮的年表都显示出较大的年际变化和强烈的共同信号，并且不同年表之间的变化也相当一致，这表明它们是区域气候的极好代表。通过对四个标准年表进行平均，建立了区域年表（RC），并将其进一步用于分析和气候重建。分析表明，树木生长主要受2月至3月和6月至7月的低降水量和5月至7月的高温的限制。此外，RC与生长季节之前和生长季节期间的每月Palmer干旱严重度指数（PDSI）具有高度相关性，因为PDSI考虑了干旱的累积。响应函数分析显示，RC仅在6月和7月与PDSI呈现显着相关性（接近5月的95％显着性水平）。由于五月至七月是树木生长的关键时期，因此在Ortindag沙地中使用RC重建了五月至七月的平均PDSI（PDSI_（5-7））。重建可以解释52％的PDSI方差，并且该方程随时间推移相当稳定。它与华北地区平均干湿指数的变化非常吻合，并记录了1960年代中期以来东亚夏季风的下降过程。值得注意的是，基于163年的干旱重建，奥丁达格沙地最近40年来最严重的干旱。像华北夏季降水一样，重建的PDSI_（5-7）也显示了20年的振荡。

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