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Six small, shallow peat bogs on the island show different microrelief features formed by ice-segregation as well as thermokarst and thermo-erosion processes. On the peat bogs the following forms have been identified: aggradational, associated with the growth of different types of ground ice (frost peat mounds, peat plateaus, polygonal peat plateaus, networks of ice-wedge polygons); and degradational, associated with thermokarst (symmetrically developed residual peat mounds and the furrows in between) and thermo-erosion (channels of niveo-fluvial streams). Some importance can also be attributed to aeolian processes, i.e. snow drifting from the tops of convex relief features for aggradational forms. Lack of insulating snow cover significantly increases frost penetration depth, promoting cryosuction and/or ice growth at the base of a frozen core. The oldest preserved forms and structures, frost peat mounds with an ice-peat core and ice-wedge polygons, developed during climatic cooling at the turn of the Subboreal and Subatlantic (c. 3.0–2.5 ka BP). Thermokarst mounds are younger, associated with warmer periods after the Little Ice Age (the warmer 1920s). 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The morphology of peat bog surfaces on Hermansenøya, NW Svalbard
https://nipr.repo.nii.ac.jp/records/14035
https://nipr.repo.nii.ac.jp/records/14035cd35ed2c-55e6-496c-8416-ecec9bba2113
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2017-02-28 | |||||
タイトル | ||||||
タイトル | The morphology of peat bog surfaces on Hermansenøya, NW Svalbard | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | The morphology of peat bog surfaces on Hermansenøya, NW Svalbard | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Svalbard | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Peat bogs | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Ice-wedge polygons | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Thermokarst mounds | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Polygonal peat plateau | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Jaworski, Tomasz
× Jaworski, Tomasz |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | This article analyses the surface morphology of the arctic peat bogs occurring on Hermansenøya, a small island in the Forlandsundet, NW Svalbard. Six small, shallow peat bogs on the island show different microrelief features formed by ice-segregation as well as thermokarst and thermo-erosion processes. On the peat bogs the following forms have been identified: aggradational, associated with the growth of different types of ground ice (frost peat mounds, peat plateaus, polygonal peat plateaus, networks of ice-wedge polygons); and degradational, associated with thermokarst (symmetrically developed residual peat mounds and the furrows in between) and thermo-erosion (channels of niveo-fluvial streams). Some importance can also be attributed to aeolian processes, i.e. snow drifting from the tops of convex relief features for aggradational forms. Lack of insulating snow cover significantly increases frost penetration depth, promoting cryosuction and/or ice growth at the base of a frozen core. The oldest preserved forms and structures, frost peat mounds with an ice-peat core and ice-wedge polygons, developed during climatic cooling at the turn of the Subboreal and Subatlantic (c. 3.0–2.5 ka BP). Thermokarst mounds are younger, associated with warmer periods after the Little Ice Age (the warmer 1920s). Channels of niveo-fluvial streams are being shaped today. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | スバールバル諸島北西部のヘルマンセノヤ島において、泥炭湿地の地表面形態に関する調査を行った。島に分布する6つの泥炭湿地では、凍上現象やサーモカルスト、融雪水による侵食、風成作用などで様々な微地形が発達している。それらは、地中氷の成長が関与した上昇型、サーモカルストが関与した退化型、融雪流が関与した熱侵食型に分けられる。最も古い微地形は、氷核を持つ泥炭マウンドとアイスウェッジポリゴンで、約3000~2500年前の寒冷気候期に形成されたと推定される。サーモカルスト型マウンドの形成年代は新しく、小氷期以降の温暖期(例えば1920年代)頃と考えられる。融雪流の流路は現在も侵食が進行しており、微地形形成が進んでいる。 | |||||
書誌情報 |
en : Polar Science 巻 11, p. 83-95, 発行日 2017-03 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 18739652 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | http://dx.doi.org/10.1016/j.polar.2016.11.006 | |||||
関連名称 | 10.1016/j.polar.2016.11.006 |