Aeolian processes and landforms in the sub-Antarctic: preliminary observations from Marion Island

被引:18
|
作者
Hedding, David W. [1 ]
Nel, Werner [2 ]
Anderson, Ryan L. [1 ]
机构
[1] Univ S Africa, Dept Geog, ZA-1710 Florida, South Africa
[2] Univ Ft Hare, Dept Geog & Environm Sci, ZA-5700 Alice, South Africa
基金
新加坡国家研究基金会;
关键词
Marion Island; climate change; wind; erosion; dispersal; METEOROLOGICAL CONTROLS; SORTED STRIPES; CLIMATE-CHANGE; WIND EROSION; TRANSPORT; RATES; SOILS;
D O I
10.3402/polar.v34.26365
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Sub-Antarctic Marion Island has a hyperoceanic climate, with cold and wet conditions and consistently strong wind velocities throughout the year. Recent observations recognized the increasing role of aeolian processes as a geomorphic agent, and this paper presents the first data for transport by aeolian processes on a sub-Antarctic island. Data were collected through an intensive and high-resolution measurement campaign at three study sites using Big Spring Number Eight sediment traps and surface sediment samplers in conjunction with an array of climatic and soil logger sensors. Observed aeolian landforms are megaripples, and the data suggest that aeolian processes are also modifying solifluction landforms. The sediment traps and sediment samplers collected wind-blown scoria at all three study sites, and the annual (horizontal) aeolian sediment flux extrapolated from this preliminary data is estimated at 0.36-3.85 kg cm(-2) y(-1). Importantly, plant material of various species was trapped during the study that suggests the efficiency of wind for the dispersal of plants in this sub-Antarctic environment may be underestimated. This paper advocates long-term monitoring of aeolian processes and that the link between aeolian processes and synoptic climate must be established. Furthermore, wind as a means to disperse genetic material on Marion Island should be investigated.
引用
收藏
页数:8
相关论文
共 50 条