2024-03-29T05:24:57Zhttp://buleria.unileon.es/oai/requestoai:buleria.unileon.es:10612/144502022-11-23T12:32:02Zcom_10612_17col_10612_18
Factors influencing the ground thermal regime in a mid-latitude glacial cirque (Hoyo Empedrado, Cantabrian Mountains, 2006–2020)
Melón-Nava, Adrián
Santos-González, Javier
Redondo Vega, José María
Blanca González-Gutiérrez, Rosa
Gómez-Villar, Amelia
Geografia Fisica
Facultad de Filosofia y Letras
Geografía
Geología
Ground thermal regime
Mountain permafrost
Talus slope
Rock glacier
Air convection
Cantabrian Mountains
2506 Geología
2505 Geografía
[EN] Air and near-surface ground temperatures were measured using dataloggers over 14 years (2006–2020) in 10 locations at 2262 to 2471 m.a.s.l. in a glacial cirque of the Cantabrian Mountains. These sites exhibit relevant differences in terms of substrate, solar radiation, orientation, and geomorphology. Basal temperature of snow (BTS) measurements and electrical resistivity tomography of the talus slope were also performed. The mean annual near-surface ground temperatures ranged from 5.1 °C on the sunny slope to 0.2 °C in the rock glacier furrow, while the mean annual air temperature was 2.5 °C. Snow cover was inferred from near-surface ground temperature (GST) data, estimating between 130 and 275 days per year and 0.5 to 7.1 m snow thickness. Temperature and BTS data show that the lowest part of the talus slope and the rock glacier furrow are the coldest places in this cirque, coinciding with a more persistent and thickest snow cover. The highest temperatures coincide with less snow cover, fine-grained soils, and higher solar radiation. Snow cover has a primary role in controlling GST, as the delayed appearance in autumn or delayed disappearance in spring have a cooling effect, but no correlation with mean annual near-surface ground temperatures exists. Heavy rain-over-snow events have an important influence on the GST. In the talus slope, air circulation during the snow-covered period produces a cooling effect in the lower part, especially during the summer. Significant inter-annual GST differences were observed that exhibited BTS limitations. A slight positive temperature trend was detected but without statistically significance and less prominent than nearby reference official meteorological stations, so topoclimatic conditions reduced the more global positive temperature trend. Probable existence of permafrost in the rock glacier furrow and the lowest part of the talus slope is claimed; however, future work is necessary to confirm this aspect.
SI
2022
2022-04-01T10:51:13Z
2022-04-01T10:51:13Z
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
0341-8162
https://www.sciencedirect.com/science/article/pii/S0341816222000960
http://hdl.handle.net/10612/14450
10.1016/j.catena.2022.106110
eng
info: eu-repo/grantAgreement/ MEC/
CGL2006-07404/ES/ESTUDIO DE LOS GLACIARES ROCOSOS RELICTOS DE LA CORDILLERA CANTABRICA. BASES PARA SU CONOCIMIENTO Y VALORACION COMO PATRIMONIO NATURAL
Junta de Castilla y León LE020A07
Junta de Castilla y León LE080G19
Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
Elsevier