基于航空高程的玛丽伯德地西部地区表面粗糙度的研究

SURFACE ROUGHNESS OF THE WEST OF MARIE BYRD LAND(ANTARCTICA)BASED ON AIRBORNE ELEVATION DATA

基于1998年12月—1999年1月德克萨斯大学地球物理研究所(UTIG)航空地球物理研究支持办公室(SOAR)对南极洲玛丽伯德西部区域航空调查获得的冰盖表面高程数据,研究了该区域表面粗糙度分布。通过分析,同时考虑表面在垂直方向和水平方向的变化,使用有效坡度可以有效地表征玛丽伯德地西部区域的表面粗糙度特征,文中给出了该区域表面的有效坡度分布,并简要探讨了其分布成因。从结果中可知该研究区域的98%地区的有效坡度分布小于10°,最小值为0.0126°;有效坡度在10°以上的位置主要分布在靠近海岸地区,爱德华七世半岛、谢里斯海岸附近的部分地区有效坡度值达到30°以上,最大有效坡度为39.9736°。结合bedmap2的高程数据,对罗斯冰架附近、福特山脉附近以及爱德华七世半岛附近的粗糙度和地形的对应关系进行了讨论。

Surface roughness of the west of Marie Byrd Land(Antarctica)was studied using airborne elevation data from the National Snow and Ice Data Center obtained by the Support Office for Aerogeophysical Research(SOAR)during flight surveys from December 1998 to January 1999.By analyzing and considering surface changes in the vertical and horizontal directions,surface roughness was accurately represented by effective slope.For 98% of the research area,the surface effective slope was less than 10°with a minimum value of 0.0126°.The effective slope above 10°was mainly distributed near the coast.The effective slopes of Edward Ⅶ Peninsula and some areas near the Shellis Coast were over 30°with a maximum of 39.9736°.The relationship between effective slope and topography on the Ross Ice Shelf,Ford Ranges and Edward Ⅶ Peninsula are discussed.