A shift in cloud cover over the southeastern Tibetan Plateau since 1600: evidence from regional tree-ring δ18O and its linkages to tropical oceans

Liu, Xiaohong; Xu, Guobao; Grießinger, Jussi; An, Wenling; Wang, Wenzhi; Zeng, Xiaomin; Wu, Guojiao; Qin, Dahe

doi:10.1016/j.quascirev.2014.01.009

Cited by 55 publications

(59 citation statements)

References 54 publications

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“…The spring climate was relatively dry in the 2000s, which was consistent with instrumental records of decreasing spring precipitation monitored in the Lijiang Meteorological Station in 21st century and drying climatic conditions reconstructed from the ice-core records, sediment records, and tree-ring 18O records (Zhang et al, 2002;He et al, 2003;Liu et al, 2014). Severe drought events occurred in the year 2006 and the year 2009-2010 in the southwestern part of China (Yin et al, 2010;Wang and Meng, 2013;Zhao et al, 2013).…”

Section: Discussionsupporting

confidence: 68%

Assessing drought variability since 1650 AD from tree‐rings on the Jade Dragon Snow Mountain, southwest China

Gebrekirstos

et al. 2015

Intl Journal of Climatology

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Southwest China has experienced significant drought during the past few years. To better understand the tendency of drought changes over time, this study applies dendroclimatological techniques to assess drought variations in Lijiang Prefecture, southwest China. So far, the longest chronology (387 years) of Picea likiangensis on the Jade Dragon Snow Mountain was constructed, and the relationships between the tree-ring width and climate variables were analysed. The spring season Palmer Drought Severity Index (PDSI) was reconstructed based on a standard chronology. Tree-ring width is positively related to precipitation and relative humidity from February to March and the PDSI from January to May. Conversely, tree-ring width is also negatively related with mean temperature from January to May, suggesting that growth of P. likiangensis is affected both by temperature and precipitation. The reconstructed PDSI showed that the Jade Dragon Snow Mountain has experienced considerable variations in spring drought conditions during the past 361 years. Four distinct periods were recognized: (1) 1650-1730, a relatively humid period with an average PDSI value above zero; (2) 1730-1860, a period with greatly fluctuating PDSI and intermittent wet periods (1746-1755, 1782-1800, and 1820-1830) and several dry periods (1735-1745, 1756-1780, 1810-1820, and 1830-1860); (3) 1870-1945, a humid period, with the highest PDSI value during 1930-1945; and (4) 1945-2011, a period with decreasing humidity. The results are consistent with hydrological studies in nearby regions and related species, as well as historical records of natural disasters. The recently observed spring drought follows a trend of decreasing humidity over the past 60 years, suggesting that a sound strategy for management and land-use planning is required to secure ecosystem and human well-being.

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Section: Discussionsupporting

confidence: 68%

Assessing drought variability since 1650 AD from tree‐rings on the Jade Dragon Snow Mountain, southwest China

Gebrekirstos

et al. 2015

Intl Journal of Climatology

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“…A reduction in the monsoon precipitation and relative humidity of the ISM in the last 200 years is also evident in other areas influenced by the ISM. Maar lake sediments in Myanmar exhibit a decreasing trend of monsoonal rainfall since 1840 CE (Sun et al, 2016); a tree-ring δ 18 O record from southeast Asia exhibits a drying trend since 1800 CE (Xu et al, 2013a); a stalagmite δ 18 O record from southwest China reveals an overall decreasing trend in monsoon precipitation since 1760 CE (Tan et al, 2016); tree-ring δ 18 O and maar lake records in southwest China indicate reduced monsoon precipitation, relative humidity and cloud cover since 1840 or 1860 CE (Chu et al, 2011;Grießinger et al, 2017;Liu et al, 2014;Wernicke et al, 2015;Xu et al, 2012). Monsoon precipitation in northwestern India shows a significant decreasing trend during the period of 1866(Bhutiyani et al, 2010.…”

Section: Interannual Variability Of the Ism Inferred From The Regionamentioning

confidence: 99%

“…However, oxygen isotopes in tree rings and ice cores from the Tibetan Plateau revealed a weakening trend ISM since 1840 or 1860 (Duan et al, 2004;Grießinger et al, 2017;Liu et al, 2014;Wernicke et al, 2015). In addition, a stalagmite oxygen isotope record from northern India indicated that the ISM experienced a 70-year pattern of variation over the last 200 years, with no clear trend (Sinha et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies

Sano

Dimri

et al. 2018

Clim. Past

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Abstract. We have constructed a regional tree-ring cellulose oxygen isotope (δ 18 O) record for the northern Indian subcontinent based on two new records from northern India and central Nepal and three published records from northwestern India, western Nepal and Bhutan. The record spans the common interval from 1743 to 2008 CE. Correlation analysis reveals that the record is significantly and negatively correlated with the three regional climatic indices: all India rainfall (AIR; r = −0.5, p < 0.001, n = 138), Indian monsoon index (IMI; r = −0.45, p < 0.001, n = 51) and the intensity of monsoonal circulation (r = −0.42, p < 0.001, n = 51). The close relationship between tree-ring cellulose δ 18 O and the Indian summer monsoon (ISM) can be explained by oxygen isotope fractionation mechanisms. Our results indicate that the regional tree-ring cellulose δ 18 O record is suitable for reconstructing high-resolution changes in the ISM. The record exhibits significant interannual and long-term variations. Interannual changes are closely related to the El Niño-Southern Oscillation (ENSO), which indicates that the ISM was affected by ENSO in the past. However, the ISM-ENSO relationship was not consistent over time, and it may be partly modulated by Indian Ocean sea surface temperature (SST). Long-term changes in the regional tree-ring δ 18 O record indicate a possible trend of weakened ISM intensity since 1820. Decreasing ISM activity is also observed in various high-resolution ISM records from southwest China and Southeast Asia, and may be the result of reduced land-ocean thermal contrasts since 1820 CE.

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“…The detected recent reduction of monsoonal precipitation has been interpreted as a reaction to increased sea surface temperatures (SSTs) over the tropical Pacific and Indian Ocean (Zhou et al, 2008a). Strong responses to regional cloud cover changes were found for tree-ring δ 18 O chronologies from the south-eastern TP Liu et al, 2014;Shi et al, 2012). The local moisture reduction starting in the middle of the 19th century is less pronounced than for south-west Tibet, and is associated with complex El Niño-Southern Oscillation (ENSO) teleconnections (Liu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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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A shift in cloud cover over the southeastern Tibetan Plateau since 1600: evidence from regional tree-ring δ18O and its linkages to tropical oceans

Cited by 55 publications

References 54 publications

Assessing drought variability since 1650 AD from tree‐rings on the Jade Dragon Snow Mountain, southwest China

Assessing drought variability since 1650 AD from tree‐rings on the Jade Dragon Snow Mountain, southwest China

Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies

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

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A shift in cloud cover over the southeastern Tibetan Plateau since 1600: evidence from regional tree-ring δ18O and its linkages to tropical oceans

Cited by 55 publications

References 54 publications

Assessing drought variability since 1650 AD from tree‐rings on the Jade Dragon Snow Mountain, southwest China

Assessing drought variability since 1650 AD from tree‐rings on the Jade Dragon Snow Mountain, southwest China

Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies

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

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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