气候变化领域集成服务门户(CCPortal): Surface kinematics of periglacial sorted circles using structure-from-motion technology

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DOI	10.5194/tc-8-1041-2014
	Surface kinematics of periglacial sorted circles using structure-from-motion technology
	Kääb A.; Girod L.; Berthling I.
发表日期	2014
ISSN	19940416
卷号	8 期号:3
英文摘要	Sorted soil circles are a form of periglacial patterned ground that is commonly noted for its striking geometric regularity. They consist of an inner fine domain bordered by gravel rings that rise some decimetres above the fine domain. Field measurements and numerical modelling suggest that these features develop from a convection-like circulation of soil in the active layer of permafrost. The related cyclic burial and exhumation of material is believed to play an important role in the soil carbon cycle of high latitudes. The connection of sorted circles to permafrost conditions and its changes over time make these ground forms potential palaeoclimatic indicators. In this study, we apply for the first time photogrammetric structure-from-motion technology (SfM) to large sets of overlapping terrestrial photos taken in August 2007 and 2010 over three sorted circles at Kvadehuksletta, western Spitsbergen. We retrieve repeat digital elevation models (DEMs) and orthoimages with millimetre resolution and precision. Changes in microrelief over the 3 yr are obtained from DEM differencing and horizontal displacement fields from tracking features between the orthoimages. In the fine domain, surface material moves radially outward at horizontal rates of up to ∼2 cm yr−1. The coarse stones on the inner slopes of the gravel rings move radially inward at similar rates. A number of substantial deviations from this overall radial symmetry, both in horizontal displacements and in microrelief, shed new light on the spatio-temporal evolution of sorted soil circles, and potentially of periglacial patterned ground in general. © Author(s) 2014.
学科领域	active layer; digital elevation model; exhumation; gravel; kinematics; microrelief; numerical model; periglacial environment; permafrost; photogrammetry; spatiotemporal analysis; Arctic; Kvadehuksletta; Spitsbergen; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	active layer; digital elevation model; exhumation; gravel; kinematics; microrelief; numerical model; periglacial environment; permafrost; photogrammetry; spatiotemporal analysis; Arctic; Kvadehuksletta; Spitsbergen; Svalbard; Svalbard and Jan Mayen
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120101
作者单位	Department of Geosciences, University of Oslo, P.O. Box 1047, Oslo, Norway; Department of Geography, Norwegian University of Science and Technology, Trondheim, 7491, Norway
推荐引用方式 GB/T 7714	Kääb A.,Girod L.,Berthling I.. Surface kinematics of periglacial sorted circles using structure-from-motion technology[J],2014,8(3).
APA	Kääb A.,Girod L.,&Berthling I..(2014).Surface kinematics of periglacial sorted circles using structure-from-motion technology.Cryosphere,8(3).
MLA	Kääb A.,et al."Surface kinematics of periglacial sorted circles using structure-from-motion technology".Cryosphere 8.3(2014).