| The performance of drought over north central China during the past 200 years |
| Paper ID : 1042-ADA2013 |
| Authors: |
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Shuyuan Kang1, Bao Yang *2 1Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu Province, China. 2320 Donggang West Road, Lanzhou, 730000, Gansu, China |
| Abstract: |
| ABSTRACT Dendrochronological techniques can contribute to bioclimatic studies by providing insight on high time resolution, precise dating and sensitivity to climate signal, tree-ring has been one of the most important proxy indicators for studying past climate. There we developed ting-width chronologies in the transitional part of the Qinghai-Tibetan Plateau and the northwest Chinese Loess Plateau of north central China. The confident period of the chronology spanning the last 207 years (AD1804-2010) based on tree-ring widths of the Qinghai Spruce (P. crassifolia Kom.). Tree-growth of Taizi Mountains is sensitive to the Palmer Drought Severity Index (PDSI) variability. The main severe low epochs of tree-ring chronology is in the periods of 1860s and 1928-1932. The variation of tree-growth agreed well with other tree-ring series and historical record from nearby and remote regions, suggesting that our chronology could respond to broad-scale climate variability. Moreover, there is good agreement with our chronology and Mongolia chronologies found in 1860s and 1928-1932, maybe suggests that moisture signal was driven by common mechanism in these regions. Compare with Monsoon Asia Drought Atlas (MADA) datasets that historical documents record can represent the spatial distribution of drought in north central China very well in period 1860s and 1928-1932. In addition, drought in 1928-1932 is wider range than that in 1860s. The highest number of counties broke out locust plague in 1860s of our locust series from 1800 to 1950 in Gansu province reveals consistent associations with our chronology record time of low value, show that 1860s period is in times of drought. Based on the El Niño chronology and our tree-ring chronology, results showed that the negative tree-ring index anomalies are associated with El Niño years, implying that El Niño-Southern Oscillation (ENSO) might be influencing moisture variability in this study area. |
| Keywords: |
| Tree-ring width; climate-growth relationship; north central China; spatial and temporal distribution |
| Status : Abstract Accepted |
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