Spatial modelling of the temperature at the top of Permafrost in Cierva Point (Antarctic Peninsula)
The Western Antarctic Peninsula (WAP) has shown complex reactions to climate change in the last decades. To evaluate the changes occurring in these environments, permafrost and active layer monitoring and modelling are essential. In this dissertation, the characteristics of the ground temperature re...
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ftunivlisboa:oai:repositorio.ul.pt:10451/36229 2023-05-15T13:02:47+02:00 Spatial modelling of the temperature at the top of Permafrost in Cierva Point (Antarctic Peninsula) Ramos Marín, Sara Vieira, Gonçalo Goyanes, Gabriel 2019-01-03T11:31:30Z http://hdl.handle.net/10451/36229 eng eng http://hdl.handle.net/10451/36229 202034771 openAccess Permafrost Active layer Temperature regime Western Antarctic Peninsula TTOP Geografia masterThesis 2019 ftunivlisboa 2022-05-25T18:39:09Z The Western Antarctic Peninsula (WAP) has shown complex reactions to climate change in the last decades. To evaluate the changes occurring in these environments, permafrost and active layer monitoring and modelling are essential. In this dissertation, the characteristics of the ground temperature regime are analysed and the spatial distribution of the “Temperature at the Top of Permafrost” (TTOP) in Cierva Point (Danco Coast, WAP) is estimated using topo-climatic information over an area of 0.65 km2. With the results, the climate sensitivity of permafrost in this area and the potential impact of small climate change in its extent are evaluated. A first evaluation of the temperature regimes allowed to determine the temperature and depth of the permafrost table and the ground thermal offset using observed borehole and climate data from nine different monitoring sites, in selected periods from 2012 to 2018. The top of permafrost was observed at depths of 0.4, 1 and 5m and the temperature at these depths was observed to be -1.4 ºC, -2.6 ºC and 1.2 ºC in these locations. For the monitoring boreholes where the top of permafrost was not reached, the depth of the top of permafrost was estimated to range between 0.4 and 5 m with temperatures ranging between -0.2 ºC and -2.6 ºC. The results were used together with topographic data to implement the spatial TTOP model using a Geographical Information System (GIS)-based methodology to implement a high-resolution model (1 x 1 m grid cell) that allows a further insight into the spatial characteristics of permafrost. Permafrost was estimated to be present in nearly 88% of the area and the lower TTOP values were found at high altitudes and unconsolidated soil or peat areas covered by moss. The highest TTOP results were found at low altitudes, bare surfaces and concave areas. Bare surfaces increase exposure to solar radiation during the summer and the concavity of the terrain promotes higher snowpack accumulation during the winter, which acts as a good thermal insulator hindering ... Master Thesis Active layer monitoring Active layer temperature Antarc* Antarctic Antarctic Peninsula permafrost Universidade de Lisboa: repositório.UL Antarctic Antarctic Peninsula Cierva ENVELOPE(-60.873,-60.873,-64.156,-64.156) Cierva Point ENVELOPE(-60.967,-60.967,-64.150,-64.150) Danco ENVELOPE(-61.033,-61.033,-64.717,-64.717) Danco Coast ENVELOPE(-62.000,-62.000,-64.700,-64.700) |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Permafrost Active layer Temperature regime Western Antarctic Peninsula TTOP Geografia |
spellingShingle |
Permafrost Active layer Temperature regime Western Antarctic Peninsula TTOP Geografia Ramos Marín, Sara Spatial modelling of the temperature at the top of Permafrost in Cierva Point (Antarctic Peninsula) |
topic_facet |
Permafrost Active layer Temperature regime Western Antarctic Peninsula TTOP Geografia |
description |
The Western Antarctic Peninsula (WAP) has shown complex reactions to climate change in the last decades. To evaluate the changes occurring in these environments, permafrost and active layer monitoring and modelling are essential. In this dissertation, the characteristics of the ground temperature regime are analysed and the spatial distribution of the “Temperature at the Top of Permafrost” (TTOP) in Cierva Point (Danco Coast, WAP) is estimated using topo-climatic information over an area of 0.65 km2. With the results, the climate sensitivity of permafrost in this area and the potential impact of small climate change in its extent are evaluated. A first evaluation of the temperature regimes allowed to determine the temperature and depth of the permafrost table and the ground thermal offset using observed borehole and climate data from nine different monitoring sites, in selected periods from 2012 to 2018. The top of permafrost was observed at depths of 0.4, 1 and 5m and the temperature at these depths was observed to be -1.4 ºC, -2.6 ºC and 1.2 ºC in these locations. For the monitoring boreholes where the top of permafrost was not reached, the depth of the top of permafrost was estimated to range between 0.4 and 5 m with temperatures ranging between -0.2 ºC and -2.6 ºC. The results were used together with topographic data to implement the spatial TTOP model using a Geographical Information System (GIS)-based methodology to implement a high-resolution model (1 x 1 m grid cell) that allows a further insight into the spatial characteristics of permafrost. Permafrost was estimated to be present in nearly 88% of the area and the lower TTOP values were found at high altitudes and unconsolidated soil or peat areas covered by moss. The highest TTOP results were found at low altitudes, bare surfaces and concave areas. Bare surfaces increase exposure to solar radiation during the summer and the concavity of the terrain promotes higher snowpack accumulation during the winter, which acts as a good thermal insulator hindering ... |
author2 |
Vieira, Gonçalo Goyanes, Gabriel |
format |
Master Thesis |
author |
Ramos Marín, Sara |
author_facet |
Ramos Marín, Sara |
author_sort |
Ramos Marín, Sara |
title |
Spatial modelling of the temperature at the top of Permafrost in Cierva Point (Antarctic Peninsula) |
title_short |
Spatial modelling of the temperature at the top of Permafrost in Cierva Point (Antarctic Peninsula) |
title_full |
Spatial modelling of the temperature at the top of Permafrost in Cierva Point (Antarctic Peninsula) |
title_fullStr |
Spatial modelling of the temperature at the top of Permafrost in Cierva Point (Antarctic Peninsula) |
title_full_unstemmed |
Spatial modelling of the temperature at the top of Permafrost in Cierva Point (Antarctic Peninsula) |
title_sort |
spatial modelling of the temperature at the top of permafrost in cierva point (antarctic peninsula) |
publishDate |
2019 |
url |
http://hdl.handle.net/10451/36229 |
long_lat |
ENVELOPE(-60.873,-60.873,-64.156,-64.156) ENVELOPE(-60.967,-60.967,-64.150,-64.150) ENVELOPE(-61.033,-61.033,-64.717,-64.717) ENVELOPE(-62.000,-62.000,-64.700,-64.700) |
geographic |
Antarctic Antarctic Peninsula Cierva Cierva Point Danco Danco Coast |
geographic_facet |
Antarctic Antarctic Peninsula Cierva Cierva Point Danco Danco Coast |
genre |
Active layer monitoring Active layer temperature Antarc* Antarctic Antarctic Peninsula permafrost |
genre_facet |
Active layer monitoring Active layer temperature Antarc* Antarctic Antarctic Peninsula permafrost |
op_relation |
http://hdl.handle.net/10451/36229 202034771 |
op_rights |
openAccess |
_version_ |
1766321247045550080 |