A chironomid-based Holocene summer air temperature reconstruction from the                 Swiss Alps

Heiri, Oliver; Lotter, André F.; Hausmann, Sonja; Kienast, Félix

doi:10.1191/0959683603hl640ft

Cited by 268 publications

(275 citation statements)

References 48 publications

(52 reference statements)

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“…Walker et al, 1997;Lotter et al, 1997;Olander et al, 1999;Brooks and Birks, 2000b;Larocque et al, 2001;Porinchu et al, 2002;Heiri et al, 2003a;Larocque et al, 2006) and successfully applied to reconstruct millennial-scale climatic oscillations during the late glacial (summary in Brooks, 2006) and patterns of temperature changes (e.g. Palmer et al, 2002;Heiri et al, 2004;Larocque and Hall, 2004) that agreed well with reconstructions obtained from other proxies and archives (e.g.…”

Section: Introductionsupporting

confidence: 51%

“…10.61c in Wiederholm (1983). (Brooks, 2000), (G) Gerzensee (Brooks, 2000), (SOP) Soppensee (Hofmann, 2001), (LOB) Lobsigensee (Hofmann, 2001), (SÄG) Sägistalsee (Heiri et al, 2003a), (BAC) Bachalpsee (Lotter et al, 2006), (LL) Lac Lautrey (Heiri and Millet, 2005), (LONG) Lac Long Inférieur (Gandouin and Franquet, 2002), and (LAV) Lago di Lavarone (Heiri et al, in press). Specialized keys were used to identify the Tanytarsini tribe (Brooks et al, 1997;Brooks et al, 2007).…”

Section: Chironomid Analysismentioning

confidence: 99%

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Late-glacial chironomid-based temperature reconstructions for Lago Piccolo di Avigliana in the southwestern Alps (Italy)

Larocque

Finsinger

2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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Chironomid headcapsules were used to reconstruct late glacial and early-Holocene summer temperatures at Lago Piccolo di Avigliana (LPA). Two training sets (northern Sweden, North America) were used to infer temperatures. The reconstructed patterns of temperature change agreed well with the GRIP and NGRIP δ 18 O records. Inferred temperatures were high during the Bølling (ca 19°C), slowly decreased to ca 17.5°C during the Allerød, reached lowest temperatures (ca 16°C) during the Younger Dryas, and increased to ca. 18.5°C during the Preboreal. The amplitudes of change at climate transitions (i.e. Oldest Dryas/Bølling: 3°C, Allerød/Younger Dryas: 1.5°C, and Younger Dryas/Preboreal: 2.5°C) were smaller than in the northern Alps but similar to those recorded at another site in northeastern Italy. Our results suggest that (1) Allerød temperatures were higher in the southern Alps and (2) higher during the Preboreal (1°C) than during the Allerød. These differences might provide an explanation for the different responses of terrestrial-vegetation to late glacial and early-Holocene climatic changes in the two regions. Other sites on both sides of the Alps should be studied to confirm these two hypotheses.

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Section: Introductionsupporting

confidence: 51%

Section: Chironomid Analysismentioning

confidence: 99%

Late-glacial chironomid-based temperature reconstructions for Lago Piccolo di Avigliana in the southwestern Alps (Italy)

Larocque

Finsinger

2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Moreover, the Lake Lautrey sediment sequence represents sublittoral/littoral deposits and Millet et al (2003) have suggested that the chironomid record of Lake Lautrey may also reflect changes in trophic and oxygen conditions in addition to changes in substratum. Recent studies indicate that a bias in inferred temperatures is possible if chironomid-temperature inference models calibrated on deep-water sediments are applied to near-shore assemblages (Heiri et al, 2003b). In lakes of a similar water depth as the Lake Lautrey palaeolake, this bias has been estimated to be of ca 0.4-0.5 °C magnitude and is therefore relatively small in comparison with the Lateglacial temperature changes inferred for the Lake Lautrey record (Fig.…”

Section: Chironomid-based Reconstructionsmentioning

confidence: 93%

Environmental and climatic changes in the Jura mountains (eastern France) during the Lateglacial–Holocene transition: a multi-proxy record from Lake Lautrey

Magny

Aalbersberg

Bégeot

et al. 2006

Quaternary Science Reviews

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This paper presents a multi-proxy reconstruction of the climatic and environmental changes during the Last Glacial-Interglacial transition as recorded by a sediment sequence from Lake Lautrey (Jura, eastern France). This reconstruction is based on analysis of pollen, chironomid, organic matter, oxygen-isotope, mineralogical, magnetic susceptibility and inferred lake-level data at a high temporal resolution. The chronology is derived using AMS radiocarbon dates, the position of the Laacher See Tephra (LST), and of correlation between the Lautrey and GRIP oxygen-isotope records. This data set reveals a detailed sequence of environmental changes in the Jura mountains from Greenland Stadial 2a to the early Holocene. Biotic and abiotic indicators allow the recognition of major abrupt changes associated with the GS2a/GI-1e, GI-1a/GS-1 and GS-1/Preboreal transitions, and other minor fluctuations related to the cold events GI-1d, GI-1b and the Preboreal oscillation (PBO). They also suggest additional cooling spells at ca 14,550 and 14,350 cal yr BP (Intra-Bølling Cold Periods), at ca 13,500 and ca 12,700 cal yr BP just before the GS-1 onset, and at ca 11,350 cal yr BP just before the PBO, as well as an intriguing brief warming episode within GS-1 at ca 12,080 cal yr BP. Summer temperature increased by ca 5 °C at the start of GI-1e, and by 1.5-3 °C at the Holocene onset, while it decreased by ca 3-4 °C at the beginning of GS-1. Major changes in local hydrology and in seasonality appear to be also associated with the GS-2a/GI1e, GI-1a/GS-1 and GS-1/Preboreal transitions. Pollen and abiotic indicators suggest a greater sensitivity of the vegetation cover to climatic oscillations during the first part of the Lateglacial Interstadial than during the second part (after ca 13,700 cal yr BP), when a closed forest had been restored in this area. By contrast, the restoration of forest cover took less than 300 yr after the end of GS-1. At the beginning of GI-1e and GS-1, no lag occurs (within the sampling resolution of 20-50 yr) in the responses of aquatic (chironomids) and terrestrial (pollen) ecosystems, while, at the onset of the Holocene, the response of the vegetation appears slightly delayed in comparison with that of the chironomid community. Finally, the recognition of two successive tephra layers, which were deposited just before the LST at ca 12,950 cal yr BP and which originated from Le Puy de la Nugère (Massif Central, France), provides an additional tephrochronological tool for correlation between Lateglacial European sequences.

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“…Samples were sieved with a 100-lm sieve, the sieve residue was examined under a stereomicroscope at about 359 magnification, and chironomid fossils were mounted on permanent microscope slides. This calibration dataset previously has been used to develop a transfer function to reconstruct past temperature changes based on fossil chironomid assemblages (Heiri et al 2003. For the present study microscope slides were re-examined as necessary to reach an identical, high taxonomic resolution for all assemblages.…”

Section: Calibration Datasetmentioning

confidence: 99%

“…The distribution of chironomids in the modern environment is strongly related to summer temperature, and this relationship has been used to construct chironomid-based temperature inference models, or transfer functions (Brooks and Birks 2001;Korhola et al 2002;Heiri et al 2003). Since the head capsules of chironomid larvae are preserved in lake sediments as identifiable fossils, these transfer functions, when applied to fossil assemblages, can provide quantitative estimates of past variations in summer temperatures.…”

Section: Introductionmentioning

confidence: 99%

How does taxonomic resolution affect chironomid-based temperature reconstruction?

Heiri

Lotter

2010

J Paleolimnol

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The resolution achievable for chironomid identifications has increased in recent years because of significant improvements in taxonomic literature. However, high taxonomic resolution requires more training for analysts. Furthermore, with greater taxonomic resolution, misidentifications and the number of rare, poorly represented taxa in chironomid calibration datasets may increase. We assessed the effects of various levels of taxonomic resolution on the performance of chironomid-based temperature inference models (transfer functions) and temperature reconstruction. A calibration dataset consisting of chironomid assemblage and temperature data from 100 lakes was examined at four levels of taxonomic detail. The coarsest taxonomic resolution primarily represented identifications to genus or suprageneric level. At the highest level of taxonomic resolution, identification to genus level was possible for 37% of taxa, and identification below genus was possible for 60% of taxa. Transfer functions were obtained using Weighted Averaging (WA) and Weighted Averaging-Partial Least Squares (WA-PLS) regression.Cross-validated performance statistics, such as the root mean square error of prediction (RMSEP) and the coefficient of determination (r 2 ) between inferred and observed values improved considerably from the lowest taxonomic resolution level (WA: RMSEP 1.91°C, r 2 0.78; WA-PLS: RMSEP 1.59°C, r 2 0.86) to the highest taxonomic resolution level (WA: RMSEP 1.66°C, r 2 0.84; WA-PLS: RMSEP 1.41°C, r 2 0.89). Reconstructed July air temperatures during the Lateglacial period based on fossil chironomid assemblages from Hijkermeer (The Netherlands) were similar for all levels of taxonomic resolution, except the coarsest level. At the coarsest taxonomic level, reconstruction failed to infer one of the known Lateglacial cold episodes in the record. Also, the difference in reconstructed values based on lowest and highest taxonomic resolutions exceeded sample-specific estimated standard errors of prediction in several instances. Our results suggest that chironomid-based transfer functions at the highest taxonomic resolution outperform models based on lower-resolution calibration data. However, transfer functions of intermediate taxonomic resolution produced results very similar to models based on high-resolution taxonomic data. In studies that include analysts with different levels of expertise, inference models based on intermediate taxonomic resolution, therefore, might provide an alternative to transfer functions of maximum taxonomic detail in order to ensure taxonomic consistency between calibration datasets and down-core records produced by different analysts.

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A chironomid-based Holocene summer air temperature reconstruction from the Swiss Alps

Abstract: Abstract:We developed a quantitative chironomid-July air temperature inference model based on surface sediments

Cited by 268 publications

References 48 publications

Late-glacial chironomid-based temperature reconstructions for Lago Piccolo di Avigliana in the southwestern Alps (Italy)

Late-glacial chironomid-based temperature reconstructions for Lago Piccolo di Avigliana in the southwestern Alps (Italy)

Environmental and climatic changes in the Jura mountains (eastern France) during the Lateglacial–Holocene transition: a multi-proxy record from Lake Lautrey

How does taxonomic resolution affect chironomid-based temperature reconstruction?

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