Inexistence of permafrost at the top of the Veleta peak (Sierra Nevada, Spain)

Marc Oliva, Antonio Gómez Ortiz, F. Salvador-Franch, M. Salvà-Catarineu, D. Palacios, N. Tanarro, M. Ramos, Paulo Alexandre da Silva Pereira, Jesus Ruiz-Fernandez

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A 114.5mdeep drillingwas carried out in August 2000 in the bedrock of the Veleta peak, at 3380min the massif of Sierra Nevada, Southern Spain. The objective of this work is to analyse temperatures at the first 60mdepth of this drilling fromSeptember 2002 to August 2013 based on 11 UTL-1 thermal loggers located at different depths, together with air temperatures at the summit of the Veleta peak. Permanent negative temperatures have not been detected in the borehole, which shows evidence of the absence of widespread permafrost conditions nowadays in the highest lands of this massif. Bedrock temperatures oscillated between 3.2 °C at 0.6mdepth and 2 °C at 20 m below the surface. The largest temperature ranges were recorded on the most external sensors until 1.2 m depth, where values reached 22.3 °C. Seasonal temperature variations were significant until 10 m depth. The thickness of the seasonal frozen layer was highly variable (0.6–2 m) and dependent on annual climate conditions. The mean air temperature at the Veleta peak increased by 0.12 °C during the study period. Bedrock temperatures followed diverging trends: a drop of 0.3–0.4 °C down to 0.6mdepth, a decrease of up to 0.7 °C between 4 and 10 m, thermal stability at 20 m and a rise of 0.2 °C that occurred in 2009 at the deepest sensor at 60 m. The calculation of the thermal wave damping in the subsoil of the Veleta peak has allowed for quantifying the thermal diffusivity of the rock as (7.05 ± 0.03)10−7 m2/s, which means that the external climate signal arrives with an 8.5-year lag to the sensor at 60 m deep. This allows to deduce a trend change in the climate of the area, moving from warmer conditions towards a trend of cooling from 2006 to 2007
Original languageEnglish
Pages (from-to) 484-494
JournalScience of the Total Environment
Volume550
DOIs
Publication statusPublished - 2016

Fingerprint

Permafrost
permafrost
bedrock
temperature
sensor
Temperature
air temperature
wave damping
climate signal
Sensors
climate conditions
subsoil
diffusivity
Thermal diffusivity
borehole
Air
Boreholes
drilling
cooling
Drilling

Keywords

  • PACE project
  • Sierra Nevada
  • Ground temperatures
  • Air temperatures

Cite this

Oliva, M., Gómez Ortiz, A., Salvador-Franch, F., Salvà-Catarineu, M., Palacios, D., Tanarro, N., ... Ruiz-Fernandez, J. (2016). Inexistence of permafrost at the top of the Veleta peak (Sierra Nevada, Spain). Science of the Total Environment, 550, 484-494. https://doi.org/10.1016/j.scitotenv.2016.01.150

Inexistence of permafrost at the top of the Veleta peak (Sierra Nevada, Spain). / Oliva, Marc; Gómez Ortiz, Antonio; Salvador-Franch, F.; Salvà-Catarineu, M.; Palacios, D.; Tanarro, N.; Ramos, M.; da Silva Pereira, Paulo Alexandre; Ruiz-Fernandez, Jesus.

In: Science of the Total Environment, Vol. 550, 2016, p. 484-494.

Research output: Contribution to journalArticle

Oliva, M, Gómez Ortiz, A, Salvador-Franch, F, Salvà-Catarineu, M, Palacios, D, Tanarro, N, Ramos, M, da Silva Pereira, PA & Ruiz-Fernandez, J 2016, 'Inexistence of permafrost at the top of the Veleta peak (Sierra Nevada, Spain)', Science of the Total Environment, vol. 550, pp. 484-494. https://doi.org/10.1016/j.scitotenv.2016.01.150
Oliva M, Gómez Ortiz A, Salvador-Franch F, Salvà-Catarineu M, Palacios D, Tanarro N et al. Inexistence of permafrost at the top of the Veleta peak (Sierra Nevada, Spain). Science of the Total Environment. 2016;550: 484-494. https://doi.org/10.1016/j.scitotenv.2016.01.150
Oliva, Marc ; Gómez Ortiz, Antonio ; Salvador-Franch, F. ; Salvà-Catarineu, M. ; Palacios, D. ; Tanarro, N. ; Ramos, M. ; da Silva Pereira, Paulo Alexandre ; Ruiz-Fernandez, Jesus. / Inexistence of permafrost at the top of the Veleta peak (Sierra Nevada, Spain). In: Science of the Total Environment. 2016 ; Vol. 550. pp. 484-494.
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