A 400-year tree-ring δ18O chronology for the southeastern Tibetan Plateau: Implications for inferring variations of the regional hydroclimate

Liu, Xiaohong; Zeng, Xiaomin; Leavitt, Steven W.; Wang, Wenzhi; An, Wenling; Xu, Guobao; Sun, Weijun; Wang, Yu; Qin, Dahe; Ren, Jiawen

doi:10.1016/j.gloplacha.2013.02.005

Cited by 55 publications

(46 citation statements)

References 45 publications

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“…The values are similar to results from nearby studies Liu et al, 2012;Liu et al, 2013). Moreover, the trees within the chronology are characterized by a common signal that is expressed by an EPS of 0.88 and a highly significant GLK of 0.57 (p<0.01).…”

Section: Chronology Characteristicssupporting

confidence: 86%

“…Multiproxy comparison of tree-ring data (TR), ice core, and lake sediment data. TR: Lhamcoka, this study; Ranwu, Liu et al, 2013;Reting, Grießinger et al, 2011;Dulan, Sheppard et al, 2004. Ice: Dasuopu and Dunde, Thompson et al, 2000.…”

Section: Discussionmentioning

confidence: 67%

“…Liu et al, 2013;Sano et al, 2013;Shi et al, 2012), the distinct humidity decline is more pronounced on the central and eastern TP. From that observation, Sano et al, 2013, con-cluded that there is a weakening of the monsoon over the last 100-200 years due to uneven SST variation (equatorial vs. northern Indian Ocean regions).…”

Section: Discussionmentioning

confidence: 92%

“…6 and locations in Fig. 1), including normalized tree-ring (TR) δ 18 O records (Ranwu TR: Liu et al, 2013;Reting TR: Grießinger et al, 2011), tree-ring width data (Dulan TR: Sheppard et al, 2004), accumulation records (Dasuopu and Dunde ice cores: Thompson et al, 2000) and lake sediments (Qinghai sediment: Xu et al, 2006a). We found significant positive correlations between our time series and the Ranwu (r = 0.55, p<0.01), Reting (r = 0.23, p<0.01), Dunde (r = 0.16, p<0.01) and Qinghai (r = 0.22, p<0.1) data sets.…”

Section: Discussionmentioning

confidence: 99%

“…The period is characterized by the driest summer in AD 1943 (RH = 68.4 %). The remarkable moisture reduction since the end of the LIA has been validated for the southern and south-eastern part of the TP (Liu (Grießinger et al, 2011;Liu et al, 2013;Shi et al, 2012) and might be caused by uneven warming trends of the northern and equatorial Indian Ocean sea surface temperatures (Chung and Ramanathan, 2006). More humid periods were detected during AD 1193-1300, AD 1345-1390, AD 1455-1475, and AD 1740-1750, with the highest relative humidity in AD 1272 (RH = 83.5 %).…”

Section: Reconstruction Of Relative Humiditymentioning

confidence: 94%

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Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ<sup>18</sup>O of tree-ring cellulose

et al. 2015

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Abstract. We present an 800-year δ 18 O chronology from the eastern part of the Tibetan Plateau (TP). The chronology dates back to AD 1193 and was sampled in AD 1996 from living Juniperus tibetica trees. This first long-term tree-ringbased δ 18 O chronology for eastern Tibet provides a reliable archive for hydroclimatic reconstructions. Highly significant correlations were obtained with hydroclimatic variables (relative humidity, vapour pressure, and precipitation) during the summer season. We applied a linear transfer model to reconstruct summer season relative humidity variations over the past 800 years. More moist conditions prevailed during the termination of the Medieval Warm Period while a systematic shift during the Little Ice Age is not detectable. A distinct trend towards more dry conditions since the 1870s is apparent. The moisture decline weakened around the 1950s but still shows a negative trend. The mid-19th century humidity decrease is in good accordance with several multiproxy hydroclimate reconstructions for south Tibet. However, the pronounced summer relative humidity decline is stronger on the central and eastern TP. Furthermore, the relative humidity at our study site is significantly linked to the relative humidity at large parts of the TP. Therefore, we deduce that the reconstructed relative humidity is mostly controlled by local and mesoscale climatic drivers, although significant connections to the higher troposphere of west-central Asia were observed.

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Section: Chronology Characteristicssupporting

confidence: 86%

Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Reconstruction Of Relative Humiditymentioning

confidence: 94%

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Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ<sup>18</sup>O of tree-ring cellulose

et al. 2015

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Tree ring δ¹⁸O's indication of a shift to a wetter climate since the 1880s in the western Tianshan Mountains of northwestern China

Liu

et al. 2015

JGR Atmospheres

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May–September precipitation in the Bhutan Himalaya since 1743 as reconstructed from tree ring cellulose δ¹⁸O

et al. 2013

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[1] We developed a 50-year tree ring δ 18 O chronology for each of three tree species (Juniperus indica, Larix griffithii, and Picea spinulosa) using a total of 12 trees (four trees per species) from the Bhutan Himalaya. Despite originating from different species sampled at two different altitudes, the δ 18 O chronologies are highly correlated with one another (r = 0.76-0.89). Response analyses reveal that tree ring δ 18 O values are controlled mainly by summer precipitation, irrespective of species. Based on these results, a robust 269-year δ 18 O chronology was established to reconstruct the amount of May-September precipitation based on data from four larch trees. Our tree ring δ 18 O data show significant correlations with those from other regions of the Himalaya and the Tibetan Plateau, indicating that common signals related to monsoon activity are recorded in the data. However, at centennial timescales, our data from Bhutan show normal conditions during the 20th century, whereas records from sites in western Nepal and the southern/eastern Tibetan Plateau show weakening trends in monsoon intensity during the last 100-200 years; the weakening trends may be the result of a reduction in the meridional sea surface temperature gradient in the Indian Ocean during this time. At continental scales, the tree ring records show that areas more from ocean basins are particularly sensitive to reduced monsoon circulation. Correlation analyses suggest that the El Niño-Southern Oscillation (ENSO) plays an important role in modulating summer precipitation. However, the teleconnected relationship disappears during the period 1951-1970, coinciding with a negative phase of the Pacific Decadal Oscillation (PDO), implying interdecadal modulation of the PDO on the influence of the ENSO on precipitation in Bhutan.

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A 400-year tree-ring δ18O chronology for the southeastern Tibetan Plateau: Implications for inferring variations of the regional hydroclimate

Cited by 55 publications

References 45 publications

Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ<sup>18</sup>O of tree-ring cellulose

Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ<sup>18</sup>O of tree-ring cellulose

Tree ring δ¹⁸O's indication of a shift to a wetter climate since the 1880s in the western Tianshan Mountains of northwestern China

May–September precipitation in the Bhutan Himalaya since 1743 as reconstructed from tree ring cellulose δ¹⁸O

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A 400-year tree-ring δ18O chronology for the southeastern Tibetan Plateau: Implications for inferring variations of the regional hydroclimate

Cited by 55 publications

References 45 publications

Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ&lt;sup&gt;18&lt;/sup&gt;O of tree-ring cellulose

Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ&lt;sup&gt;18&lt;/sup&gt;O of tree-ring cellulose

Tree ring δ18O's indication of a shift to a wetter climate since the 1880s in the western Tianshan Mountains of northwestern China

May–September precipitation in the Bhutan Himalaya since 1743 as reconstructed from tree ring cellulose δ18O

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Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ<sup>18</sup>O of tree-ring cellulose

Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ<sup>18</sup>O of tree-ring cellulose

Tree ring δ¹⁸O's indication of a shift to a wetter climate since the 1880s in the western Tianshan Mountains of northwestern China

May–September precipitation in the Bhutan Himalaya since 1743 as reconstructed from tree ring cellulose δ¹⁸O