Active layer physical processes at Broeggerhalvoya, western Spitsbergen, Version 1

These data have been collected from an Arctic desert site (latitude 78o57'29N, longitude 12o27'42E), Broeggerhalvoya inwestern Spitsbergen, 10 km NW from Ny Alesund, 45 m above sealevel, 2 km from the shore. This is a low relief tip of a bedrockpeninsula covered with several meters of glacial drift and reworked raised beach ridges. The measurements are obtained in the site of well developed patterned ground, sorted polygons, where the influence of plants, including thermal insulation and transpiration, is negligible. The 1985-1986 period was average. Mean annual air temperature was -6.6 C, 0.4 C colder than the long-term (1975-1990) mean, but well within the mean variability. Mean winter air temperature is relatively warm (mean of coldest month, February, is -14.6 C). Annual precipitation was 17 % greater than the ong-term mean (372 mm); however, the number of rain-on-snow events was less (3) than average (5.5). Overall, the reference period is close to long-term averages.

A program of automated soil temperature recordings was initiated in the summer of 1984, at a patterned ground field site Thermistors were placed approximately 0.1 m apart in an epoxy-filled PVC rod (18 mm outside diameter), buried in the center of a fine-grained domain of a sorted circle, down to 1.14 m below the ground surface. The data presented here covers 7/1/85-7/1/86, once a day (6 am), at two levels (0.0 m, 1.145 m below surface). The resolution of the thermistors is 0.004 C, and the accuracy is estimated to be 0.02 C near 0 C. Missing data accounts for less than 7 %. The gaps are filled with simple average of the beginning and end of the gap values. For a detailed description of the field site and data analysis see Putkonen (1997) and Hallet and Prestrud (1986).These data are presented on the CAPS Version 1.0 CD-ROM, June 1998.

本数据集采集自斯匹次卑尔根岛西部的布罗格哈尔沃亚（Broeggerhalvoya）一处北极荒漠站点，地理坐标为北纬78°57′29″、东经12°27′42″，距离新奥尔松（Ny Alesund）西北10公里，海拔45米，距海岸2公里。这里是基岩半岛的低缓尖端，覆盖有数米厚的冰碛物与经改造的抬升滩脊。测量点位位于发育完好的有序地面（patterned ground）——分选多边形区域，该区域内植物的影响（包括隔热与蒸腾作用）可忽略不计。1985-1986年为平均气候年份，年平均气温为-6.6℃，较长期（1975-1990年）平均气温低0.4℃，但仍处于气候变率的正常区间内。冬季平均气温相对偏高（最冷月份2月的平均气温为-14.6℃）。年降水量较长期平均值（372毫米）高出17%，但雪面降雨事件次数（3次）低于平均水平（5.5次）。总体而言，该参考时段的气候参数接近长期平均值。

1984年夏季，研究团队在该有序地面野外站点启动了自动化土壤温度记录项目。热敏电阻（thermistors）以约0.1米的间距布置在填充环氧树脂的聚氯乙烯（PVC）杆（外径18毫米）上，埋设于分选圆的细粒区域中心，深度达地表下1.14米。本数据集涵盖1985年7月1日至1986年7月1日的观测数据，每日（当地时间6时）采集一次，共设置两个测量深度：地表处（0.0米）与地表下1.145米处。热敏电阻的温度分辨率为0.004℃，在0℃附近的测量精度约为0.02℃。数据缺失占比不足7%，缺失间隙采用间隙首尾值的简单平均值进行补全。关于野外站点与数据分析的详细说明，请参阅Putkonen（1997）以及Hallet与Prestrud（1986）的研究成果。本数据集已收录于1998年6月发布的CAPS 1.0版光盘中。