Unusual twentieth-century summer warmth in a 1,000-year temperature record from Siberia

Briffa, Keith R.; Jones, Phil; Schweingruber, Fritz Hans; Shiyatov, S. G.; Cook, Edward R.

doi:10.1038/376156a0

Cited by 272 publications

(189 citation statements)

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“…The tree-ring data in Siberia and Mongolia neighboring the Altay Mountains revealed the similar rise of temperatures form the mid-nineteenth century (Jacoby et al 1996;Briffa et al 2002). The growth of Siberian larch in the Altay Mountains also captures this warming trend (Fig.…”

Section: Tree Growth and Recent Warming Trendsmentioning

confidence: 81%

“…In strongly exposed locations, it may be no bigger than a shrub. Several tree-ring chronologies of Siberian larch, as climatic proxy records, have been developed from the Altay Mountains in recent decades (Ovtchinnikov et al 2000;Briffa et al 2002;Frank et al 2007;Myglan et al 2008;Loader et al 2010;Dulamsuren et al 2010;Sidorova et al 2011;Chen et al 2011). In the course of these studies, growth-climate relationships in different regions and across environmental gradients were evaluated (Frank et al 2007;Dulamsuren et al 2010;Chen et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Climatic response of ring width and maximum latewood density of Larix sibirica in the Altay Mountains, reveals recent warming trends

Chen

Yuan

Wang

et al. 2012

Annals of Forest Science

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& Introduction Siberian larch (Larix sibirica) is a highly climate sensitive species. Presently, the Altay Mountains is covered by widespread forests dominated by Siberian larch and thus has a great potential for dendroclimatological studies. However, tree-ring network of the Altay Mountains has not yet been well developed. The development of the new chronologies and the knowledge about the influence of climatic variables on tree growth is needed. & Method X-ray densitometric techniques were applied to obtain ring width (RW) and maximum latewood density (MXD) of Siberian larch from two upper tree line sites in the Altay Mountains, China. Climatic responses in ring widths and maximum latewood densities from the Altay Mountains (China, Russia, and Mongolia) were investigated by simple correlation analyses. To assess the common growth forces among the individual sites of the Altay Mountains, simple correlation, principal component analyses, and spatial correlation analysis were applied over the common period of the chronologies. & Results Ring width and maximum latewood density increases with decreasing precipitation, increasing temperature from late spring to late summer during the growing season. Based on the results of principal component analyses and spatial correlation analysis, summer temperature (June-July) is the most important forces on the Siberian larch growth of the Altay Mountains. The growth of Siberian larch in the Altay Mountains captures the current warming trend. The growth of Siberian larch did not clearly lose its sensitivity under most recent warming in our study areas. & Conclusions The new MXD chronologies is presently the longest, absolutely dated, tree-ring density record yet developed from China. The climate response analysis shows that the RW and MXD of Siberian larch have strong responses to temperature in the growing season. Thus, MXD and RW of Siberian larch provides the best information for climate reconstruction in the warm season. Tree-rings of Siberian larch allow detecting the recently observed warming trend and putting it into the long-term climatic context in the Altay Mountains, due to the strong growth sensitivity to temperature change.

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Section: Tree Growth and Recent Warming Trendsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Climatic response of ring width and maximum latewood density of Larix sibirica in the Altay Mountains, reveals recent warming trends

Chen

Yuan

Wang

et al. 2012

Annals of Forest Science

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“…Taken together, the volcanic eruptions may have affected a large area in southwest China. Warming in the 20 th century has been observed in treering reconstructions of temperature from widespread regions of Eurasia (Jacoby et al 1996;Briffa et al 2002;Gou et al 2007;Büntgen et al 2008;Chen et al 2010). Based on instrument data and other proxies, Wang et al (2004) showed that temperature anomalies during the period 1920 -1950 are noticeably positive over China throughout the last century.…”

Section: Discussionmentioning

confidence: 99%

Temperature Signals in Tree-Ring Width Chronologies of Alpine Treeline Conifers from the Baishui River Nature Reserve, China

Wang¹,

Chen²,

Yuan³

et al. 2013

Terr. Atmos. Ocean. Sci.

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Numerous dendro-climatic reconstructions have been developed for China, but there are still regions with limited data of this type. One region is the Qinling Mountains which is characterized by complex interactions between the mountains and climate. Presently, the subalpine region of the Qinling Mountains is covered by widespread forests and has great potential for dendroclimatological studies. Here we developed tree-ring width chronologies from two fir (Abies faxoniana) and one spruce (Picea brachytyla) sites in the Baishui River Nature Reserve, the western region of the Qinling Mountains, China. Climate response analysis reveals that radial growth of the fir site (TLD) is mainly controlled by temperature variations. The TLD chronology accounts for 32.7% of February -June temperature variance during the period 1959 -2006. Using a linear regression approach, we reconstructed the February -June temperature of Wen County for the past 252 years. The cool periods are identified for AD 1795 -1800, 1812 -1827, 1881 -1888, 1895 -1902, 1916 -1929, 1967 -1972 and 1978-1995. Warm conditions prevailed during AD 1783 -1794, 1801 -1811, 1828 -1856, 1867 -1880, 1889 -1894, 1903 -1915 and 1930 -1966. Wavelet analysis reveals the existence of some cycles (2.0 -3. 4, 5.7, 10.0 and 19.3 years). Spatial correlation analysis shows that the temperature reconstruction captures regional climatic variations over Central and Southwest China. The moving t-test indicated an abrupt warming change of our reconstruction occurred during the past 20 years. Overall, our study indicates the feasibility of combining tree-rings and the temperature to reconstruct large-scale temperature patterns over this area.

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“…Although the available regional temperature records only cover the period from the 1930s to present time, it is likely there was an annual temperature increase at the turn of the 20th century. The circum-Arctic annual air temperature increased between $1900 and 1940s (McBean et al 2004) and the tree-ring measurements from Salekhard (66°50¢ N, 65°15¢ E) in the eastern part of the northern Urals also indicate an increase in summer temperature between 1901(Briffa et al 1995Shiyatov et al 2002). We therefore suggest that the diatom changes observed at the turn of the 20th century were climatically induced.…”

Section: Mitrofanovskoe Lakementioning

confidence: 99%

Palaeolimnological evidence for recent climatic change in lakes from the northern Urals, arctic Russia

et al. 2005

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The recent sediments from two deep arctic lakes, Mitrofanovskoe and Vanuk-ty, situated in the permafrost belt within the Bol'shezemel'skaya Tundra in the northern Ural region, were studied for diatoms, chironomids, spheroidal carbonaceous particles and stable lead isotopes. The magnitudes and rates-of-change in diatom and chironomid assemblages were numerically estimated. Instrumental climate records were used to assess statistically the amount of variance in diatom and chironomid data explained by temperature. August and September air temperatures have a statistically significant effect on diatom composition at both lakes. At Mitrofanovskoe Lake, major compositional changes in diatom and chironomid assemblages occurred at the turn of the 20th century and might be related to the regional increase in temperature. Chironomidinferred air temperature also increased by approximately 1°C since the early 1900s. At both lakes diatom compositional changes, coincident with the increase in June and September temperatures, also occurred in the late 1960s. These compositional changes are correlated with the increase in diatom production, sediment organic content and diatom species richness, and are likely to be a diatom response to the lengthening of the growing season. These changes are also correlated with the circum-Arctic temperature increase from the 1960s. A chironomid response to the late 1960s temperature increase was less pronounced at both lakes. Pollution levels are relatively low and pollution history is unrelated to ecological changes. Both lead isotopes and spheroidal carbonaceous particles show a clear atmospheric pollution signal, peaking in the 1980s.

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Unusual twentieth-century summer warmth in a 1,000-year temperature record from Siberia

Cited by 272 publications

References 17 publications

Climatic response of ring width and maximum latewood density of Larix sibirica in the Altay Mountains, reveals recent warming trends

Climatic response of ring width and maximum latewood density of Larix sibirica in the Altay Mountains, reveals recent warming trends

Temperature Signals in Tree-Ring Width Chronologies of Alpine Treeline Conifers from the Baishui River Nature Reserve, China

Palaeolimnological evidence for recent climatic change in lakes from the northern Urals, arctic Russia

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