气候变化领域集成服务门户(CCPortal): Aerial images of eroding permafrost coastline, Qikiqtaruk

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.901852
	Aerial images of eroding permafrost coastline, Qikiqtaruk - Hershel Island, Yukon, Canada
	Cunliffe; Andrew M; Tanski; George; Radosavljevic; Boris; Palmer; William; Sachs; Torsten; Kerby; Jeffrey T; Myers-Smith; Isla H
发布日期	2019-05-17
数据集类型	dataset
英文关键词	Aerial Images ; coastal change ; erosion ; Permafrost
英文简介	Permafrost landscapes are changing around the Arctic in response to climate warming, with coastal erosion being one of the most prominent and hazardous features. Using drone platforms, satellite images, and historic aerial photographs, we observed the rapid retreat of a permafrost coastline on Qikiqtaruk – Herschel Island, Yukon Territory, in the Canadian Beaufort Sea. This coastline is adjacent to a gravel spit accommodating several culturally significant sites and is the logistical base for the Qikiqtaruk – Herschel Island Territorial Park operations. In this study we sought to (i) assess short-term coastal erosion dynamics over fine temporal resolution, (ii) evaluate short-term shoreline change in the context of long-term observations, and (iii) demonstrate the potential of low-cost lightweight unmanned aerial vehicles (“drones”) to inform coastline studies and management decisions. We resurveyed a 500 m permafrost coastal reach at high temporal frequency (seven surveys over 40 d in 2017). Intra-seasonal shoreline changes were related to meteorological and oceanographic variables to understand controls on intra-seasonal erosion patterns. To put our short-term observations into historical context, we combined our analysis of shoreline positions in 2016 and 2017 with historical observations from 1952, 1970, 2000, and 2011. In just the summer of 2017, we observed coastal retreat of 14.5 m, more than 6 times faster than the long-term average rate of 2.2±0.1 m a−1 (1952–2017). Coastline retreat rates exceeded 1.0±0.1 m d−1 over a single 4 d period. Over 40 d, we estimated removal of ca. 0.96 m3 m−1 d−1. These findings highlight the episodic nature of shoreline change and the important role of storm events, which are poorly understood along permafrost coastlines. We found drone surveys combined with image-based modelling yield fine spatial resolution and accurately geolocated observations that are highly suitable to observe intra-seasonal erosion dynamics in rapidly changing Arctic landscapes.
空间范围	Latitude: 69.570000 * Longitude: -138.900000
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215859
推荐引用方式 GB/T 7714	Cunliffe,Andrew M,Tanski,et al. Aerial images of eroding permafrost coastline, Qikiqtaruk - Hershel Island, Yukon, Canada.2019-05-17.https://doi.org/10.1594/PANGAEA.901852.