scholarly journals Limnological changes and chironomid-inferred summer air temperature from the Late Pleniglacial to the Early Holocene in the East Carpathians

2021 ◽  
pp. 1-15
Author(s):  
Mónika Tóth ◽  
Oliver Heiri ◽  
Ildikó Vincze ◽  
Mihály Braun ◽  
Zoltán Szabó ◽  
...  
Keyword(s):  
Air Temperature ◽  
Temperature Reconstruction ◽  
Late Glacial ◽  
Early Holocene ◽  
Nutrient Level ◽  
Temperature Changes ◽  
Heinrich Event ◽  
Eastern Carpathians ◽  
Decreasing Ph ◽  
East Carpathians

Abstract Here we provide the first chironomid record and associated summer air-temperature (TVII) reconstruction between ca. 16,800–9100 cal yr BP from Lake Saint Anne (SZA), situated in the Eastern Carpathians. SZA was formed by the youngest volcanic eruption of Ciomadul volcano at ca. 29,600 cal yr BP. Our main goals in this study are to test whether warming after Heinrich event 1 (H1; ca. 16,200 cal yr BP) had similar amplitude to the late glacial warming, while Younger Dryas (YD) summers remained relatively warm in this region of Europe. We found the most remarkable chironomid assemblage change with a TVII increase of ~3.5–3.8°C at ca. 16,350 cal yr BP at SZA, followed by another slight TVII increase of ~0.8–1.0°C at ca. 14,450 cal yr BP. Only very minor temperature variations were recorded between 14,450 cal yr BP and 11,700 cal yr BP, with an unexpected TVII decrease in the Early Holocene. Variations in water depth together with increasing analogue problems and paludification from ca. 14,200 cal yr BP onwards may have influenced the reliability of our paleotemperature record obtained from SZA. In addition, Sphagnum-indicated decreasing pH, and hence decreasing nutrient level, likely overrode the effect of summer air-temperature changes during the Early Holocene, and this may explain the bias in the chironomid-inferred summer air-temperature reconstruction in the Early Holocene section.

A chironomid-based reconstruction of late glacial summer temperatures in the Pareng Mountains (Romania)

2021 ◽  
Author(s):  
Zoltán Szabó ◽  
Oliver Heiri ◽  
Gabriella Darabos ◽  
Ivett Pálfi ◽  
Mihály Molnár ◽  
...  
Keyword(s):  
Air Temperature ◽  
Temperature Increase ◽  
Ice Core ◽  
Temperature Reconstruction ◽  
Late Glacial ◽  
Early Holocene ◽  
Cold Event ◽  
Air Temperatures ◽  
Important Addition ◽  
Summer Temperatures

<p>Late Glacial and Early Holocene summer temperatures were reconstructed based on fossil chironomid assemblages at Lake Latorica (Lacul Iezerul Latoritei; Pareng Mountains, 1530 m a.s.l.) with a joint Norwegian – Swiss transfer function, providing an important addition to the late glacial quantitative climate reconstructions from eastern-central Europe. The reconstructed pattern of the Late Glacial faunal and chironomid-inferred temperature changes in Lake Latorica shows some differences from the NGRIP δ<sup>18</sup>O record and other European chironomid-based reconstructions; however, it is consistent with the chironomid results of Lake Brazi from the neighbouring Retyezat Mountains (1740 m a.s.l.). Our reconstruction shows that the summer air temperature at Lake Latorica increased by ~ 3°C at the Oldest Dryas/Bølling transition (GS-2/GI-1) and reached 8.1-10.8°C during the Late Glacial interstadial. The Younger Dryas (GS-1) climate reversal in the chironomid-based temperature reconstruction is shown by only a weak decrease (~1°C), while slow temperature increase (9.7–11°C) is observed in the second half of the period. At the Holocene transition temperature increase of nearly 2°C was observed in the reconstruction. Before the Preboreal Oscillation (PO) the mean summer air temperature in the Early Holocene was 12.5°C. During PO the temperature reconstruction shows a decrease of 1.8°C. This cold event coincides with cooling in the Greenland ice core records and other European temperature reconstructions. After the Preboral oscillation the summer air temperatures increase to ~12.8°C in the Early Holocene.</p>

A chironomid-based reconstruction of late glacial summer temperatures in the southern Carpathians (Romania)

2012 ◽  
Vol 77 (1) ◽  
pp. 122-131 ◽  
Author(s):  
Mónika Tóth ◽  
Enikő K. Magyari ◽  
Stephen J. Brooks ◽  
Mihály Braun ◽  
Krisztina Buczkó ◽  
...  
Keyword(s):  
Ice Core ◽  
Late Glacial ◽  
Summer Temperature ◽  
Early Holocene ◽  
Short Term ◽  
Temperature Changes ◽  
Climate Reconstructions ◽  
Important Addition ◽  
Cold Events ◽  
Summer Temperatures

Late glacial and early Holocene summer temperatures were reconstructed based on fossil chironomid assemblages at Lake Brazi (Retezat Mountains) with a joint Norwegian"Swiss transfer function, providing an important addition to the late glacial quantitative climate reconstructions from Europe. The pattern of the late glacial temperature changes in Lake Brazi show both similarities and some differences from the NGRIP δ18O record and other European chironomid-based reconstructions. Our reconstruction indicates that at Lake Brazi (1740 m a.s.l.) summer air temperature increased by ~ 2.8ºC at the Oldest Dryas/Bølling transition (GS-2/GI-1) and reached 8.1–8.7ºC during the late glacial interstade. The onset of the Younger Dryas (GS-1) was characterized by a weak (< 1ºC) decrease in chironomid-inferred temperatures. Similarly, at the GS-1/Holocene transition no major changes in summer temperature were recorded. In the early Holocene, summer temperature increased in two steps and reached ~ 12.0–13.3ºC during the Preboreal. Two short-term cold events were detected during the early Holocene between 11,480–11,390 and 10,350–10,190 cal yr BP. The first cooling coincides with the Preboreal oscillation and shows a weak (0.7ºC) temperature decrease, while the second is characterized by 1ºC cooling. Both cold events coincide with cooling events in the Greenland ice core records and other European temperature reconstructions.

scholarly journals High Arctic Holocene temperature record from the Agassiz ice cap and Greenland ice sheet evolution

2017 ◽  
Vol 114 (23) ◽  
pp. 5952-5957 ◽  
Author(s):  
Benoit S. Lecavalier ◽  
David A. Fisher ◽  
Glenn A. Milne ◽  
Bo M. Vinther ◽  
Lev Tarasov ◽  
...  
Keyword(s):  
Air Temperature ◽  
Ice Core ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Temperature Reconstruction ◽  
High Arctic ◽  
Early Holocene ◽  
Temperature Record ◽  
The Past ◽  
Ice Cap

We present a revised and extended high Arctic air temperature reconstruction from a single proxy that spans the past ∼12,000 y (up to 2009 CE). Our reconstruction from the Agassiz ice cap (Ellesmere Island, Canada) indicates an earlier and warmer Holocene thermal maximum with early Holocene temperatures that are 4–5 °C warmer compared with a previous reconstruction, and regularly exceed contemporary values for a period of ∼3,000 y. Our results show that air temperatures in this region are now at their warmest in the past 6,800–7,800 y, and that the recent rate of temperature change is unprecedented over the entire Holocene. The warmer early Holocene inferred from the Agassiz ice core leads to an estimated ∼1 km of ice thinning in northwest Greenland during the early Holocene using the Camp Century ice core. Ice modeling results show that this large thinning is consistent with our air temperature reconstruction. The modeling results also demonstrate the broader significance of the enhanced warming, with a retreat of the northern ice margin behind its present position in the mid Holocene and a ∼25% increase in total Greenland ice sheet mass loss (∼1.4 m sea-level equivalent) during the last deglaciation, both of which have implications for interpreting geodetic measurements of land uplift and gravity changes in northern Greenland.

Modeling air temperature changes in Northern Asia

2014 ◽  
Vol 122 ◽  
pp. 14-22 ◽  
Author(s):  
A. Onuchin ◽  
M. Korets ◽  
A. Shvidenko ◽  
T. Burenina ◽  
A. Musokhranova
Keyword(s):  
Air Temperature ◽  
Northern Asia ◽  
Temperature Changes

scholarly journals Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles

2012 ◽  
Vol 8 (3) ◽  
pp. 1109-1125 ◽  
Author(s):  
R. Uemura ◽  
V. Masson-Delmotte ◽  
J. Jouzel ◽  
A. Landais ◽  
H. Motoyama ◽  
...  
Keyword(s):  
Air Temperature ◽  
Ice Core ◽  
Ice Cores ◽  
Regression Equations ◽  
Temperature Changes ◽  
Source Temperature ◽  
Moisture Source ◽  
Isotopic Model ◽  
Temperature Proxy ◽  
Coefficient Of Regression

Abstract. A single isotope ratio (δD or δ18O) of water is widely used as an air-temperature proxy in Antarctic ice core records. These isotope ratios, however, do not solely depend on air-temperature but also on the extent of distillation of heavy isotopes out of atmospheric water vapor from an oceanic moisture source to a precipitation site. The temperature changes at the oceanic moisture source (Δ Tsource) and at the precipitation site (Δ Tsite) can be retrieved by using deuterium-excess (d) data. A new d record from Dome Fuji, Antarctica spanning the past 360 000 yr is presented and compared with records from Vostok and EPICA Dome C ice cores. In previous studies, to retrieve Δ Tsource and Δ Tsite information, different linear regression equations were proposed using theoretical isotope distillation models. A major source of uncertainty lies in the coefficient of regression, βsite which is related to the sensitivity of d to Δ Tsite. We show that different ranges of temperature and selections of isotopic model outputs may increase the value of βsite by more than a factor of two. To explore the impacts of this coefficient on reconstructed temperatures, we apply for the first time the exact same methodology to the isotope records from the three Antarctica ice cores. We show that uncertainties in the βsite coefficient strongly affect (i) the glacial–interglacial magnitude of Δ Tsource; (ii) the imprint of obliquity in Δ Tsource and in the site-source temperature gradient. By contrast, we highlight the robustness of Δ Tsite reconstruction using water isotopes records.

Human-environment relationships during the Late Glacial-Early Holocene transition: some examples from Campania, Calabria and Sicily

2009 ◽  
pp. 89-94 ◽  
Author(s):  
Fabio Martini ◽  
Andre Carlo Colonese ◽  
Zelia di Giuseppe ◽  
Massimiliano Ghinassi ◽  
Domenico Lo Vetro ◽  
...  
Keyword(s):  
Late Glacial ◽  
Early Holocene ◽  
Human Environment

Late-glacial and Early Holocene climate and environment from stable isotopes in Welsh tufa

Quaternaire ◽  
2006 ◽  
pp. 31-42 ◽  
Author(s):  
E. R. Garnett ◽  
J. E. Andrews ◽  
Richard C. Preece ◽  
P. F. Dennis
Keyword(s):  
Stable Isotopes ◽  
Late Glacial ◽  
Early Holocene ◽  
Holocene Climate
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