Technical Note: How accurate can stalagmite formation temperatures be determined using vapour bubble radius measurements in fluid inclusions?
| Autor: | Dominik Marti, Martin Frenz, Rita Hidalgo-Staub, Florentin Samuel Spadin, Dominik Fleitmann, Jaroslav Ricka |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
lcsh:GE1-350
Global and Planetary Change geography geography.geographical_feature_category Stratigraphy Bubble lcsh:Environmental protection Paleontology Mineralogy Stalagmite Radius lcsh:Environmental pollution 13. Climate action lcsh:TD172-193.5 Fluid inclusions lcsh:TD169-171.8 Geology lcsh:Environmental sciences |
| Zdroj: | Climate of the Past, Vol 11, Iss 6, Pp 905-913 (2015) Climate of the Past Discussions |
| ISSN: | 1814-9332 1814-9324 |
| Popis: | Stalagmites are natural archives containing detailed information on continental climate variability of the past. Microthermometric measurements of fluid inclusion homogenisation temperatures allow determination of stalagmite formation temperatures by measuring the radius of stable laser-induced vapour bubbles inside the inclusions. A reliable method for precisely measuring the radius of vapour bubbles is presented. The method is applied to stalagmite samples for which the formation temperature is known. An assessment of the bubble radius measurement accuracy and how this error influences the uncertainty in determining the formation temperature is provided. We demonstrate that the nominal homogenisation temperature of a single inclusion can be determined with an accuracy of ±0.25 °C, if the volume of the inclusion is larger than 105 μm3. With this method, we could measure in a proof-of-principle investigation that the formation temperature of 10–20 yr old inclusions in a stalagmite taken from the Milandre cave is 9.87 ± 0.80 °C, while the mean annual surface temperature, that in the case of the Milandre cave correlates well with the cave temperature, was 9.6 ± 0.15 °C, calculated from actual measurements at that time, showing a very good agreement. Formation temperatures of inclusions formed during the last 450 yr are found in a temperature range between 8.4 and 9.6 °C, which corresponds to the calculated average surface temperature. Paleotemperatures can thus be determined within ±1.0 °C. |
| Databáze: | OpenAIRE |
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