Glacial and periglacial geomorphology of central Troms and Finnmark county, Arctic Norway

Here we present a glacial and periglacial geomorphological map of a ∼6800 km2 region of central Troms and Finnmark county, Arctic Norway. The map is presented at a 1:115,000 scale with the aim of characterising the spatial distribution of glacial and periglacial landforms and facilitating the reconstruction of the glacial history of the region during the latter stages of deglaciation from the Last Glacial Maximum and into the Holocene. Mapping was conducted predominantly by manual digitisation of landforms using a combination of Sentinel-2A/2B satellite imagery (10 m pixel resolution), vertical aerial photographs (<1 m pixel resolution), and Digital Elevation Models (10 and 2 m pixel resolution). Over 20,000 individual features have been mapped and include moraines (subdivided into major and minor moraines), ridges within areas of discrete debris accumulations (DDAs), flutings, eskers, irregular mounded terrain, lineations, glacially streamlined bedrock, possible glacially streamlined terrain, pronival ramparts, rock glaciers (subdivided into valley wall and valley floor, and rock glacierised moraines), lithalsas, contemporary glaciers and lakes. The map records several noteworthy large moraine assemblages within individual valleys, forming inset sequences from pre-Younger Dryas limits up to the 2018/19 ice margins and represents a valuable dataset for reconstructing Holocene glacial and periglacial activity.本研究发布了北极挪威特罗姆斯（Troms）与芬马克（Finnmark）郡中部约6800平方千米区域的冰川与冰缘地貌（glacial and periglacial geomorphological）图。 该地图比例尺为1:115000，旨在刻画冰川与冰缘地貌的空间分布特征，并助力重建该区域自末次冰盛期（Last Glacial Maximum）进入全新世（Holocene）的冰退后期冰川演化历史。 本次制图主要通过人工数字化识别地貌完成，所用数据源包括哨兵-2A/2B（Sentinel-2A/2B）卫星影像（像素分辨率10米）、垂直航空照片（像素分辨率小于1米）以及数字高程模型（Digital Elevation Models，10米与2米分辨率）。 本次共制图识别超过20000处独立地貌单元，涵盖冰碛（moraines，细分为主冰碛与次冰碛）、离散碎屑堆积区（discrete debris accumulations, DDAs）内的垄岗、冰川槽痕（flutings）、蛇形丘（eskers）、不规则丘状地貌、地貌线理、冰川流线型基岩、疑似冰川流线型地貌、雪缘垄岗（pronival ramparts）、岩屑冰川（rock glaciers，细分为谷壁型、谷床型与冰碛岩屑冰川）、岩质冰丘（lithalsas）、现代冰川与湖泊。 该地图记录了多个山谷内值得关注的大型冰碛组合体，其形成的嵌入冰碛序列可追溯至新仙女木期（Younger Dryas）之前的冰界，直至2018/2019年的冰缘，是重建全新世冰川与冰缘活动的宝贵数据集。