干旱区生态环境知识资源中心(Arid): Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile

Arid

DOI	10.5194/tc-16-647-2022
	Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile
	Robson, Benjamin Aubrey; MacDonell, Shelley; Ayala, Alvaro; Bolch, Tobias; Nielsen, Pal Ringkjob; Vivero, Sebastian
通讯作者	Robson, BA (corresponding author)，Univ Bergen, Dept Earth Sci, Bergen, Norway. ; Robson, BA (corresponding author)，Bjerknes Ctr Climate Res, Bergen, Norway.
来源期刊	CRYOSPHERE
ISSN	1994-0416
EISSN	1994-0424
出版年	2022
卷号	16 期号:2 页码:647-665
英文摘要	Glaciers and rock glaciers play an important role in the hydrology of the semi-arid northern Chile. Several studies show that glaciers have rapidly lost mass in response to climate change during the last decades. The response of rock glaciers to climate change in this region is, however, less known. In this study we use a combination of historical aerial photography, stereo satellite imagery, airborne lidar, and the Shuttle Radar Topography Mission (SRTM) DEM to report glacier changes for the Tapado Glacier-rock glacier complex from the 1950s to 2020 and to report mass balances for the glacier component of the complex, Tapado Glacier. Furthermore, we examine high-resolution elevation changes and surface velocities between 2012 and 2020 for 35 rock glaciers in the La Laguna catchment. Our results show how Tapado Glacier has shrunk by -25.2 +/- 4.6 % between 1956 and 2020, while the mass balance of Tapado Glacier has become steadily more negative, from being approximately in balance between 1956 and 1978 (-0.04 +/- 0.08 m w.e. a(-1)) to showing increased losses between 2015 and 2020 (-0.32 +/- 0.08 m w.e. a(-1)). Climatological (re-)analyses reveal a general increase in air temperature, decrease in humidity, and variable precipitation since the 1980s in the region. In particular, the severe droughts starting in 2010 resulted in a negative mass balance of -0.54 +/- 0.10 m w.e. a(-1) between 2012 and 2015. The rock glaciers within the La Laguna catchment show heterogenous changes, with some sections of landforms exhibiting pronounced elevation changes and surface velocities exceeding that of Tapado Glacier. This could be indicative of high ice contents within the landforms and also highlights the importance of considering how landforms can transition from more glacial landforms to more periglacial features under permafrost conditions. As such, we believe high-resolution (sub-metre) elevation changes and surface velocities are a useful first step for identifying ice-rich landforms.
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000760776100001
WOS关键词	GEODETIC MASS-BALANCE ; CENTRAL ANDES ; DRY ANDES ; ICE CAP ; ELEVATION CHANGES ; SEMIARID ANDES ; TAPADO GLACIER ; VOLUME CHANGE ; CERRO-TAPADO ; EVOLUTION
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376275
作者单位	[Robson, Benjamin Aubrey] Univ Bergen, Dept Earth Sci, Bergen, Norway; [Robson, Benjamin Aubrey] Bjerknes Ctr Climate Res, Bergen, Norway; [MacDonell, Shelley] Univ Canterbury & Lincoln Univ, Waterways Ctr Freshwater Management, Christchurch 8140, New Zealand; [MacDonell, Shelley; Ayala, Alvaro] Ctr Estudios Avanzados Zonas Aridas CEAZA, La Serena, Chile; [Bolch, Tobias] Univ St Andrews, Sch Geog & Sustainable Dev, St Andrews, Fife, Scotland; [Nielsen, Pal Ringkjob] Univ Bergen, Dept Geog, Bergen, Norway; [Vivero, Sebastian] Univ Lausanne, Inst Earth Surface Dynam, Lausanne, Switzerland
推荐引用方式 GB/T 7714	Robson, Benjamin Aubrey,MacDonell, Shelley,Ayala, Alvaro,et al. Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile[J],2022,16(2):647-665.
APA	Robson, Benjamin Aubrey,MacDonell, Shelley,Ayala, Alvaro,Bolch, Tobias,Nielsen, Pal Ringkjob,&Vivero, Sebastian.(2022).Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile.CRYOSPHERE,16(2),647-665.
MLA	Robson, Benjamin Aubrey,et al."Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile".CRYOSPHERE 16.2(2022):647-665.