A 382-year reconstruction of August mean minimum temperature from tree-ring maximum latewood density on the southeastern Tibetan Plateau, China

Heng, Liang; Lyu, Lixin; Wahab, Muhammad

doi:10.1016/j.dendro.2015.11.001

Cited by 38 publications

(15 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

103

View full text Add to dashboard Cite

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

show abstract

Section: The Itrax Multiscannermentioning

confidence: 99%

Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Björklund

Arx

Nievergelt

et al. 2019

Reviews of Geophysics

103

View full text Add to dashboard Cite

show abstract

“…Tree-ring analysis is often used in long-term paleoclimatic reconstructions because of the wide distribution of data, length of data, and ability to accurately date annual variability [8][9][10][11][12]. Although numerous tree-ring-based paleoclimatic reconstructions are available for China [8,13,14], compared with other regions, such as the Tibetan Plateau [15,16], the Qinling Mountains [17,18], the Tianshan Mountains [19,20], and southeastern China [21,22], long-term paleoclimatic records are still relatively sparse for northeast China. In this context, an improved tree-ring network, comprised of denser spatial coverage and a longer time span, is urgently required for this region.…”

Section: Introductionmentioning

confidence: 99%

Tree-Ring-Recorded Drought Variability in the Northern Daxing’anling Mountains of Northeastern China

Jiang

Shah

Zhou

et al. 2018

Forests

View full text Add to dashboard Cite

We developed two tree-ring width chronologies of Mongolian Scots pine (Pinus sylvestris var. mongolica) from the low elevation forest of the northern Daxing’anling Mountains of Inner Mongolia. Although the two chronologies come from different sampling sites, significant correlations existed among the chronologies (r = 0.318), and the first principal component (PC1) accounted for 65.9% of total variance over their common period 1792–2016. Climate-growth correlation analysis revealed that the previous June and July Palmer drought severity index (PDSIp6-7) was the main climatic factor controlling tree-ring growth. Using a linear regression model, we reconstructed the PDSIp6-7 for the past 225 years (1792–2016). The reconstruction satisfied required statistical calibration and validation tests, and represented 38.6% of the PDSI variance recorded by instruments over the period 1955–2016. Six wet and five dry periods were revealed during these 225 years. The drought of 1903–1927 was the most severe drought in the study area in the last 225 years. Comparison with other tree-ring-based moisture-sensitive sequences from nearby regions confirmed a high degree of confidence in our reconstruction. The results of a spatial climate correlation analysis with a gridded PDSI dataset revealed that our reconstructions contained strong regional drought signals for the southern Stanovoy Range and the northern Daxing’anling Mountains. The power spectrum revealed the existence of significant frequency cycles, which may be linked to large-scale atmospheric-oceanic variability, such as the El Niño-Southern Oscillation, solar activity, and the North Atlantic Oscillation.

show abstract

“…Among the existing and largely statistical efforts, relating proxy data to local meteorological time series is the dominant approach (e.g., Grießinger et al, ; Liang et al, ). A second tendency is the linkage with remote large‐scale mechanisms of climate variability in the tropics (e.g., Pacific and Indian Ocean conditions) and extratropics (e.g., North Atlantic variability) (Hochreuther et al, ; Liang et al, ), which makes sense in view of High Asia's location at the interface of tropical and extratropical climates.…”

Section: Introductionmentioning

confidence: 99%

“…However, the said research typically regards the driver role of the two systems in separation and to be unequal. Since westerlies blow over High Asia constantly only in winter (Maussion et al, ), but the strongest signals in proxies all over High Asia are associated with the summer months (Grießinger et al, ; Liang et al, ; Zhu et al, ) during the northward progression of the monsoon, the ISM is favored in the literature for explaining climatic fluctuations at all time scales; only for individual mountain chains in northern High Asia are the westerlies deemed important (Yao et al, ). Yet the separation concept is not consistent with the findings from atmospheric research that the westerlies do not fully “withdraw” in summer (see below).…”

Section: Introductionmentioning

confidence: 99%

Prominent Midlatitude Circulation Signature in High Asia's Surface Climate During Monsoon

et al. 2017

View full text Add to dashboard Cite

High Asia has experienced strong environmental changes in recent decades, as evident in records of glaciers, lakes, tree rings, and vegetation. The multiscale understanding of the climatic drivers, however, is still incomplete. In particular, few systematic assessments have evaluated to what degree, if at all, the midlatitude westerly circulation modifies local surface climates in the reach of the Indian Summer Monsoon. This paper shows that a southward shift of the upper‐tropospheric westerlies contributes significantly to climate variability in the core monsoon season (July–September) by two prominent dipole patterns at the surface: cooling in the west of High Asia contrasts with warming in the east, while moist anomalies in the east and northwest occur with drying along the southwestern margins. Circulation anomalies help to understand the dipoles and coincide with shifts in both the westerly wave train and the South Asian High, which imprint on air mass advection and local energy budgets. The relation of the variabilities to a well‐established index of midlatitude climate dynamics allows future research on climate proxies to include a fresh hypothesis for the interpretation of environmental changes.

show abstract

A 382-year reconstruction of August mean minimum temperature from tree-ring maximum latewood density on the southeastern Tibetan Plateau, China

Cited by 38 publications

References 45 publications

Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Scientific Merits and Analytical Challenges of Tree‐Ring Densitometry

Tree-Ring-Recorded Drought Variability in the Northern Daxing’anling Mountains of Northeastern China

Prominent Midlatitude Circulation Signature in High Asia's Surface Climate During Monsoon

Contact Info

Product

Resources

About