Long-term summer temperature variations in the Pyrenees from detrended stable carbon isotopes

Esper, Jan; Konter, Oliver; Krusic, Paul J.; Saurer, Matthias; Holzkämper, Steffen; Büntgen, Ulf

doi:10.1515/geochr-2015-0006

Cited by 40 publications

(36 citation statements)

References 24 publications

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“…This record is the first climate reconstruction for the IR filling the gap between the temperature reconstructions developed for the north IP (Büntgen et al, 2008;Dorado Liñán et al, 2012;Esper et al, 2015a) and for the southern IP (Dorado Liñán et al, 2014). The IR2Tmax has been achieved using TRW, which is the same parameter used for the southern IP (Dorado Liñán et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…The IR2Tmax has been achieved using TRW, which is the same parameter used for the southern IP (Dorado Liñán et al, 2014). However, for the Pyrenees, maximum latewood density (MXD) (Büntgen et al, 2008;Dorado Liñán et al, 2012) or stable isotopes (Esper et al, 2015a) are needed to get skillful records for a temperature reconstruction.…”

Section: Discussionmentioning

confidence: 99%

“…In the IP, much progress has been made to reconstruct past centuries climate variability, including analysis of documentary evidence for temperature (i.e., Camuffo et al, 2010) and drought reconstruction (i.e., Barriendos, 1997;Vicente-Serrano and Cuadrat, 2007;Domínguez-Castro et al, 2010). Additionally, progress has been made in further understanding long-term climate variability in the IP through dendroclimatological studies focussing on drought (Esper et al, 2014;Tejedor et al, 2016) and temperature (Büntgen et al, 2008;Dorado Liñán et al, 2012Esper et al, 2015a). Nevertheless, a temperature reconstruction for central Spain is still missing.…”

Section: Introductionmentioning

confidence: 99%

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Temperature variability in the Iberian Range since 1602 inferred from tree-ring records

et al. 2017

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Abstract. Tree rings are an important proxy to understand the natural drivers of climate variability in the Mediterranean Basin and hence to improve future climate scenarios in a vulnerable region. Here, we compile 316 tree-ring width series from 11 conifer sites in the western Iberian Range. We apply a new standardization method based on the trunk basal area instead of the tree cambial age to develop a regional chronology which preserves high-to low-frequency variability. A new reconstruction for the 1602-2012 period correlates at −0.78 with observational September temperatures with a cumulative mean of the 21 previous months over the 1945-2012 calibration period. The new IR2Tmax reconstruction is spatially representative for the Iberian Peninsula and captures the full range of past Iberian Range temperature variability. Reconstructed long-term temperature variations match reasonably well with solar irradiance changes since warm and cold phases correspond with high and low solar activity, respectively. In addition, some annual temperature downturns coincide with volcanic eruptions with a 3-year lag.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature variability in the Iberian Range since 1602 inferred from tree-ring records

et al. 2017

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“…However, the potential of trees to record additional climate elements including relative humidity, sunshine and cloud cover changes has not been fully explored, and the combination of widely used TRW and MXD chronologies with other tree-ring proxies such as stable isotope ratios, height increments and cell parameters might further improve climate reconstructions (e.g., Bräun-ing, 2001;Carrer et al, 2016;Fonti & Babushkina, 2016;McCarroll et al, 2003). Only few studies have been conducted evaluating the climatic information recorded in both the classical tree-ring growth proxies, TRW and MXD, together with the stable isotope ratios, δ 13 C and δ 18 O (e.g., Esper et al, 2015a;Gagen et al, 2006;Hartl-Meier et al, 2015;Kirdyanov et al, 2008;Treydte et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Spruce tree-ring proxy signals during cold and warm periods

Esper¹,

Carnelli²,

Kamenik³

et al. 2017

Dendrobiology

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Abstract:The strength and temporal rigidity of climate signals are important characteristics of proxy data used to reconstruct climate variability over pre-instrumental periods. Here, we assess the performance of different tree-ring proxies, including ring width, maximum latewood density, δ 13 C, and δ 18 O, during exceptional cold (1800-1850) and warm periods . The analysis was conducted at a spruce (Picea abies) timberline site in the Swiss Alps in proximity to long homogenized instrumental records to support calibration tests against early temperature and precipitation data. In this cold environment, tree-ring width, maximum latewood density, and δ 18O are mainly controlled by temperature variations. δ 13 C is influenced by various factors including temperature, precipitation, sunshine, and relative humidity. When comparing the response patterns during cold and warm periods, ring width and maximum latewood density revealed temporally stable temperature signals. In contrast, the association between the stable isotopes and climate changed considerably between the early 19th and late 20th centuries. The temperature signal in δ 18O was stronger during the recent warm period, whereas the opposite is true for δ 13 C. In δ 13 C, the temperature signal weakened from the early 19th to the late 20th centuries, but an (inverse) precipitation signal evolved indicating that soil moisture conditions additionally limited recent carbon isotope ratios. An attempt to combine the tree-ring proxies in a multiple regression model did not substantially improve the strength of the dominating temperature signal retained in the latewood density data as this proxy already explained a significant fraction of summer temperature variability. Our findings underscore the importance of split calibration/verification approaches including cold and warm periods, and challenge transfer models based on only late 20th century observational data.

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“…The negative exponential curve (neg) detrending method was applied using the ARSTAN software (Cook and Peters, ; Cook, ). The final δ 13 C res chronology was developed by (a) inverting the δ 13 C (corrected for changes in carbon isotope composition and concentration of atmospheric CO 2 ) by multiplying the individual series with (−1), in order to have positive values and (b) by removing the δ 13 C age trend by calculation of residual values from a negative exponential function (Esper et al ., ); and (c) calculation of the robust means of the detrended δ 13 C series, (d) inverting the resulting δ 13 C chronology by multiplying with (−1) in order to have the original trend of chronology, which was used further for climate correlations.…”

Section: Methodsmentioning

confidence: 99%

Climate signals in carbon and oxygen isotope ratios ofPinus cembratree‐ring cellulose from the Călimani Mountains, Romania

Nagavciuc

Kern

Ionita

et al. 2019

Intl Journal of Climatology

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We analyse annually resolved tree‐ring stable carbon (δ13C) and oxygen (δ18O) isotopic chronologies from Swiss stone pine (Pinus cembra L.) in Romania. The chronologies cover the period between 1876 and 2012 and integrate data from four individual trees from the Calimani Mts in the eastern Carpathians where climatic records are scarce and starts only from 1961. Calibration trials show that the δ13C values correlate with local April–May relative humidity and with regional to larger scale (European) summer precipitation. δ18O correlates significantly with local relative humidity, cloud cover, maximum temperature, as well as European scale drought conditions. In all cases, the climate effects on δ13C values are weaker than those recorded in the δ18O data, with the latter revealing a tendency toward higher (lower) values of δ18O during extremely dry (wet) years. The most striking signal, however, is the strong link between the interannual δ18O variability recorded in the Calimani Mts and large‐scale circulation patterns associated with North Atlantic and Mediteraneean Sea sea surface temperatures. High (low) values of δ18O occur in association with a high (low) pressure system over the central and eastern part of Europe and with a significantly warmer (colder) Mediterranean Sea surface temperature. These results demonstrate the possibility of using tree ring oxygen isotopes from the eastern Carpathians to reconstruct regional drought conditions in eastern Europe on long‐term time scales and larger scale circulation dynamics over the preinstrumental periods.

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Long-term summer temperature variations in the Pyrenees from detrended stable carbon isotopes

Cited by 40 publications

References 24 publications

Temperature variability in the Iberian Range since 1602 inferred from tree-ring records

Temperature variability in the Iberian Range since 1602 inferred from tree-ring records

Spruce tree-ring proxy signals during cold and warm periods

Climate signals in carbon and oxygen isotope ratios ofPinus cembratree‐ring cellulose from the Călimani Mountains, Romania

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