Absence of late-summer warming trend over the past two and half centuries on the eastern Tibetan Plateau

Xing, Puyuan; Zhang, Qi-Bin; Lv, Li-Xin

doi:10.1016/j.gloplacha.2014.10.006

Cited by 18 publications

(11 citation statements)

References 72 publications

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“…The Itrax multiscanner by Cox Analytical Systems (Sweden) was mainly, but not exclusively, developed for wood samples-the functionality permits the analysis of speleothems and other small flat samples and additionally offers information about chemical composition of the samples when equipped with an X-ray fluorescence detector (Hevia et al, 2018;Scharnweber et al, 2016). Available since 2004, an increasing number of laboratories (at present 15) have used the Itrax multiscanner to produce density data for a number of dendroecological and/or dendroclimatological studies (e.g., Björklund et al, 2015;Björklund et al, 2013;Cameron et al, 2015;Duan & Zhang, 2014;Gunnarson et al, 2011;Gunnarson et al, 2012;Helama et al, 2014;Liang et al, 2016;Linderholm et al, 2015;Melvin et al, 2013;McCarroll et al, 2013;Xing et al, 2014;Zhang et al, 2015Zhang et al, , 2016. Many of these studies combine new or updated measurements with previously published MXD data acquired by other analytical techniques such as the Walesch technique.…”

Section: The Itrax Multiscannermentioning

confidence: 99%

Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Björklund

Arx

Nievergelt

et al. 2019

Reviews of Geophysics

117

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X-ray microdensitometry on annually resolved tree-ring samples has gained an exceptional position in last-millennium paleoclimatology through the maximum latewood density (MXD) parameter, but also increasingly through other density parameters. For 50 years, X-ray based measurement techniques have been the de facto standard. However, studies report offsets in the mean levels for MXD measurements derived from different laboratories, indicating challenges of accuracy and precision. Moreover, reflected visible light-based techniques are becoming increasingly popular, and wood anatomical techniques are emerging as a potentially powerful pathway to extract density information at the highest resolution. Here we review the current understanding and merits of wood density for tree-ring research, associated microdensitometric techniques, and analytical measurement challenges. The review is further complemented with a careful comparison of new measurements derived at 17 laboratories, using several different techniques. The new experiment allowed us to corroborate and refresh "long-standing wisdom" but also provide new insights. Key outcomes include (i) a demonstration of the need for mass/volume-based recalibration to accurately estimate average ring density; (ii) a substantiation of systematic differences in MXD measurements that cautions for great care when combining density data sets for climate reconstructions; and (iii) insights into the relevance of analytical measurement resolution in signals derived from tree-ring density data. Finally, we provide recommendations expected to facilitate future inter-comparability and interpretations for global change research.Plain Language Summary Paleoclimatology, the study of how the climate has changed throughout earth history, is an important component of climate change research. The wood density of tree

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Section: The Itrax Multiscannermentioning

confidence: 99%

Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Björklund

Arx

Nievergelt

et al. 2019

Reviews of Geophysics

117

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“…Since 1901, global mean surface temperature has increased by 0.89˝C according to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) [6]. This warming trend is complex with large spatial heterogeneity, varying from significant temperature increase at some regions to no change or even cooling at certain regions [7][8][9]. Evidence also suggests that high-mountain environments are experiencing more rapid warming than lowlands, and this phenomenon is usually referred to as elevation-dependent warming (EDW) [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The Tibetan (Qinghai-Xizang) Plateau, known as the "Third Pole" of the Earth and the "Water Tower of Asia", is the highest plateau in the world and has been regarded as one of the ideal regions to study climate change [9,25,26]. Studies have suggested that the warming rate rise as elevation increases [10], causing higher climate sensitivity and phenological changes in higher elevations, but dominant climatic factors differ considerably across the Tibetan Plateau [2,11,27].…”

Section: Introductionmentioning

confidence: 99%

Elevation-Dependent Vegetation Greening of the Yarlung Zangbo River Basin in the Southern Tibetan Plateau, 1999–2013

Weishou

et al. 2015

Remote Sensing

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Abstract:The Yarlung Zangbo River basin is an important alley to transport moisture from the Indian Ocean to the inner Tibetan Plateau. With a wide range of elevations from 147 m to over 7000 m above sea level (a.s.l.), ecosystems respond differently to climate change at various elevations. However, the pattern of elevation-dependent vegetation change and how it responds to recent warming have been rarely reported. Here, we investigated the pattern of vegetation greening at different elevations in this river basin using SPOT normalized difference vegetation index (NDVI) data during 1999-2013, and examined its relationship with elevation-dependent changes in temperature and precipitation. The annual NDVI has increased by 8.83% from 1999 to 2013. In particular, the NDVI increased more apparently at lower elevations, but remained relatively stable or even decreased at high elevations. It seems that rising temperature has driven the basin-wide vegetation greening, but the greening rate is in contrast to the pattern of elevation-dependent warming (EDW) with more significant temperature increase at higher elevations. It appears that decreasing precipitation does not reverse the overall increasing trend in NDVI, but relatively limited precipitation (<500 mm) may constrain the NDVI increases, causing apparently stable or even decreased NDVI at higher elevations (>4000 m).

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“…Although the maximum length of chronologies derived from tree‐ring isotopes is shorter than those derived from tree‐ring width on the TP, a few tree‐ring isotope chronologies longer than 600 years have been established (Holmes et al ., ; Griessinger et al ., , ). Along with tree‐ring width and isotopes, tree‐ring density also displays great potential in reconstructing historical climate on the TP, especially for late summer or growing season temperatures (Bräuning and Mantwill, ; Fan et al ., ; Duan et al ., , ; Wang et al ., ; Chen et al ., ; Xing et al ., ; Duan et al ., ; Yin et al ., ; Duan et al ., ; Li et al ., ; Li et al ., ). However, the chronology length of published tree‐ring density records is less than 600 years on the TP to date.…”

Section: Introductionmentioning

confidence: 99%

Post‐industrial late summer warming recorded in tree‐ring density in the eastern Tibetan Plateau

Duan

et al. 2019

Intl Journal of Climatology

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Tree‐ring density has been suggested to be a useful proxy for revealing long‐term late summer or growing season temperature variability on the Tibetan Plateau (TP). However, the current chronology length of tree‐ring density records on the TP is obviously shorter than both tree‐ring width and tree‐ring isotope records. This phenomenon implies the possibility of extending the current tree‐ring density record into earlier times and provides us with an opportunity to evaluate recent warming on a longer time scale. In this study, we present a 640‐year tree‐ring maximum latewood density (MXD) chronology of Balfour spruce back to 1,375 CE in the eastern TP. This tree‐ring MXD chronology is longer than the previous ones on the TP. Growth‐climate relationship analysis shows that the established MXD chronology correlates significantly and positively with August–September mean temperatures recorded at the nearest meteorological station over the common period of 1954–2014 (r = 0.66, effective degree of freedom [edf] = 62.7, p < 0.0001). Based on the growth‐climate response relationship, the August–September mean temperature was reconstructed from 1,625 to 2,014, which is the reliable period of the MXD chronology, with the expressed population signal (EPS) greater than 0.85. The reconstructed August–September temperatures show an increasing trend since the late 19th century, and this reconstruction suggests that the last 10‐, 30‐, 50‐ and 100‐year periods all appear to be the warmest over the past 390 years. Together with preciously published temperature reconstructions based on tree‐ring MXD near our study area, the results of this study demonstrate that the southeastern TP has experienced post‐industrial warming since the late 19th century.

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Absence of late-summer warming trend over the past two and half centuries on the eastern Tibetan Plateau

Cited by 18 publications

References 72 publications

Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Elevation-Dependent Vegetation Greening of the Yarlung Zangbo River Basin in the Southern Tibetan Plateau, 1999–2013

Post‐industrial late summer warming recorded in tree‐ring density in the eastern Tibetan Plateau

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