Abstract:

Barrow is located in the northeast of Alaskan coastal plain ( 71°20′ N,156°40′W ),which is encircled by the Chukchi Sea in the west and the Beaufort Sea in the north.Thus,it is considered to be a key region for studying the land ocean interaction related to climatic and environmental changes.For the goals,an unfrozen 60 cm deep lake deposit core (AB67) was recovered at the water depth of 2m (2km to the bank of the Elson Lagoon ) by the use of Piston Corer.According to the measurements on 210 Pb of the upper sector ( 0￣20 cm ) and on the grain size of the whole core ,the sedimentary time span of the whole core (60 cm) is estimated to be about 450 years,i.e. 1540￣1990 AD. It can be stratigraphically divided into three sectors. The upper sector (0￣21 cm ) mainly consists of silt and clay ,and the lower sector ( 32￣60 cm ) mainly consists of fine sands and silts with small gravels,while the grain size of middle sector is between that of the two sectors.Grain size data showed that the driving force of sedimentation is stronger in the lower sector and weaker in the upper sector,while the driving force of sedimentation in middle sector is between that in lower and upper sector. The sortification and probability accumulation charts of the deposit samples showed the same trend.