Influence of micro-site conditions on tree-ring climate signals and trends in central and northern Sweden

Düthorn, Elisabeth; Holzkämper, Steffen; Timonen, Mauri; Esper, Jan

doi:10.1007/s00468-013-0887-8

Cited by 35 publications

(35 citation statements)

References 28 publications

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“…Our results indicate that tree growth at lakeshores is limited and suppressed. Düthorn et al (2013) assumed that this effect is linked to a high groundwater table and hence anaerobic soil conditions. This effect is stronger for spruce compared to pine.…”

Section: Discussionmentioning

confidence: 99%

“…1: "wet" ) and trees standing a few meters beyond the lakeshore ( Fig. 1: "dry") (Düthorn et al 2013). The dataset consists of 50 Picea abies and 50 Pinus sylvestris per micro-site (spruce_wet/spruce_dry and pine_wet/pine_dry, respectively).…”

Section: Tree-ring Datamentioning

confidence: 99%

“…The detrended single series were multiplied with the mean growth rate of the spruce_wet site (Fig. 5) assuming that trees at the lakeshore show equal mean growth curves like subfossil logs (Düthorn et al 2013). Consequently, the mean growth rate of the subalpine chronology is similar to the mean growth rate of the lakeshore spruce site.…”

Section: Artificial Relict Datamentioning

confidence: 99%

“…Micro-site effects in pine chronologies are already recognized (Düthorn et al 2013) but the ecological effects for spruces are unknown so far. Fig.…”

Section: Growth Rate Differencesmentioning

confidence: 99%

“…Confining such homogeneous sampling sites, however, remains ambiguous. Düthorn et al (2013) showed that even spatially close populations of Pinus sylvestris might comprise different micro-habitats which affect growth-rates and -patterns.…”

Section: Introductionmentioning

confidence: 99%

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On the hidden significance of differing micro-sites on tree-ring based climate reconstructions

Düthorn¹,

Schneider²,

Konter³

et al. 2015

Silva Fenn.

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2015). On the hidden significance of differing micro-sites on tree-ring based climate reconstructions. Silva Fennica vol. 49 no. 1 article id 1220. 12 p. Highlights• Pines and spruces show growth level differences in wet and dry micro-sites with higher growth rates in the dry sites.• Spruces show a robust climate-growth relationship with June-July temperatures.• Application of collective detrending methods can bias long-term trends in climate reconstructions, if relict and recent samples originate from different micro-sites. AbstractTree-ring chronologies are commonly extended back in time by combining samples from living trees with relict material preserved in man-made structures or natural archives (e.g. lakes). Although spatially close, these natural archives and living-tree-sites often comprise different micro-climates. Inhomogeneous growth conditions among these habitats, which may yield offsets in growth-rates, require caution in data processing. Here we assess species-specific growth dynamics in two micro-habitats and their potential effects on long chronologies by combining tree-ring data from different living-tree-sites with an "artificial" subfossil dataset. Well replicated (n > 80) Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris L.) chronologies from northern Fennoscandia, sampled directly at the lakeshore (wet) and several meters beyond the lakeshore (dry) reveal high coherence of the variance between micro-sites (r spruce = 0.59, r pine = 0.68). Significant differences of the Regional Curves (RC) indicate faster growth of both species at the drier site though. Growth differences are more pronounced between the spruce micro-sites. The combination of recent dry and wet spruce data with artificial relict data results in two long chronologies covering the last 800 years with substantially different trends, although they consist of the same relict material and the micro-site chronologies correlate significantly over the past two centuries. The combination of spruce samples from dry inland micro-sites with subfossil samples originating from the wet lake shore can result in an underestimation of past temperatures prior to the 19th century. Such effects, hidden in the composition of long chronologies (living trees + subfossil samples) can bias long-term trends in climate reconstructions.

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Section: Discussionmentioning

confidence: 99%

Section: Tree-ring Datamentioning

confidence: 99%

Section: Artificial Relict Datamentioning

confidence: 99%

“…Micro-site effects in pine chronologies are already recognized (Düthorn et al 2013) but the ecological effects for spruces are unknown so far. Fig.…”

Section: Growth Rate Differencesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the hidden significance of differing micro-sites on tree-ring based climate reconstructions

Düthorn¹,

Schneider²,

Konter³

et al. 2015

Silva Fenn.

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A 1200+ year reconstruction of temperature extremes for the northeastern Mediterranean region

Klippel

Krusic

Konter

et al. 2018

Intl Journal of Climatology

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Proxy evidence is necessary to place current temperature and hydroclimatic changes in a long‐term context and to assess the full range of natural and anthropogenic climate forcings. Here, we present the first millennium‐length reconstruction of late summer (August–September) temperature variability for the Mediterranean region. We compiled 132 maximum latewood density (MXD) tree‐ring series of living and relict Pinus heldreichii trees from a network of four high‐elevation sites in the Pindus Mountains of Greece. Forty series reach back into the first millennium and the oldest sample dates to 575 CE. At annual to decadal scales, the record correlates significantly with August–September temperatures over the Balkan Peninsula and northeastern Mediterranean (r1950–2014 = 0.71, p < 0.001). We produce two reconstructions emphasizing interannual and decadal scale variance over the past millennium. Analysis of temperature extremes reveals the coldest summers occurred in 1035, 1117, 1217, 1884 and 1959 and the coldest decades were 1061–1070 and 1811–1820. The warmest summers occurred in 1240 and 1474, and the warmest decades were 1141–1150 and 1481–1490. Comparison of this new reconstruction with MXD‐based summer temperature reconstructions across Europe reveals synchronized occurrences of extreme cool summers in the northeastern Mediterranean, and an antiphase‐relationship with warm summer temperatures over the British Isles and Scandinavia. This temperature dipole is related to anomalies in the latitudinal position of the North Atlantic Jet. Despite the representation of common atmospheric forcing patterns, the occurrence of warm extremes is limited to few events, suggesting potential weaknesses of MXD to record warm temperature anomalies. In addition, we acknowledge problems in the observational data to capture local temperature variability due to small scale topographic differences in this high‐elevation landscape. At a broader geographical scale, the occurrence of common cold summer extremes is restricted to years with volcanically induced changes in radiative forcing.

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Northern European summer temperature variations over the Common Era from integrated tree‐ring density records

Esper

Düthorn

Krusic

et al. 2014

J Quaternary Science

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148

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Tree-ring chronologies of maximum latewood density are most suitable to reconstruct annually resolved summer temperature variations of the late Holocene. The two longest such chronologies have been developed in northern Europe stretching back to the 2nd century BC, and the 5th century AD. We show where similarities between the two chronologies exist, and combine portions of both into a new summer temperature reconstruction for the Common Era. To minimize the transfer of potential biases, we assess the contribution of the candidate reconstructions' measurements, and exclude data (i) from exceptionally young and old trees, and (ii) produced by different laboratory technologies. Our new composite reconstruction reveals warmer conditions during Roman, Medieval and recent times, separated by prolonged cooling during the Migration period and Little Ice Age. Twentieth century warmth, as indicated in one of the existing density records, is reduced in the new reconstruction, also affecting the overall, millennial-scale, cooling trend over the late Holocene (À0.30˚C per 1000 years). Due to the reduced biological memory, typical for tree-ring density measurements, the new reconstruction is most suitable for evaluating the rate and speed of abrupt summer cooling following large volcanic eruptions.

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Influence of micro-site conditions on tree-ring climate signals and trends in central and northern Sweden

Cited by 35 publications

References 28 publications

On the hidden significance of differing micro-sites on tree-ring based climate reconstructions

On the hidden significance of differing micro-sites on tree-ring based climate reconstructions

A 1200+ year reconstruction of temperature extremes for the northeastern Mediterranean region

Northern European summer temperature variations over the Common Era from integrated tree‐ring density records

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