Multiyear accumulation and temperature history near the North Greenland Ice Core Project site
Multiyear accumulation and temperature history near the North Greenland Ice Core Project site
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北格陵兰冰芯项目现场附近的多年积累和温度历史
DOI：
10.1029/2001jd900197
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发表时间：
2001
影响因子：
--
通讯作者：
M. Alfred
中科院分区：
文献类型：
--
作者：
C. Shuman;D. Bromwich;J. Kipfstuhl;M. Alfred
本文介绍了两个独立的方法估计跨格陵兰岛内部的亚季节积累的比较。这些方法，高分辨率雪坑研究和大气模拟，有不同的空间和时间分辨率，但都可以估计净积累的亚季节和较短的时间。雪坑的方法是基于高分辨率的雪坑配置文件的氧稳定同位素比（8 SO）和多年的特殊传感器微波/成像仪（SSM/I）37-GHz的亮度温度记录之间的关系。SSM/I数据的配置文件在1995年阿尔弗雷德·韦格纳研究所北格陵兰导线场季节的比较表明，iiiSO数据从雪中格陵兰岛北部是一个可靠的，高分辨率的温度代理。这使得积累量，速度和时间从大约1991年7月至1995年6月的确定，通过这220公里长的断面的冰盖。根据欧洲中期天气预报中心的数据，从早期建模得出的降水估计显示出类似的平均季节模式，但这些站点的累积幅度减小（-56%）。根据附近北格陵兰冰芯项目（NGRIP）站点自动气象站观测和计算的温度历史，对每个站点的多年T与III相关性的斜率进行了评估。这些数据应有助于解释NGRIP深芯的古气候记录。
This paper presents a comparison of two independent methods of estimating subseasonal accumulation across the interior of Greenland. These methods, high- resolution snow pit studies and atmospheric modeling, have differing spatial and temporal resolution, but both can estimate net accumulation for subseasonal and shorter periods. The snow pit approach is based on a documented relationship between high-resolution snow pit profiles of oxygen stable isotope ratio (8SO) and multiyear Special Sensor Microwave/Imager (SSM/I) 37-GHz brightness temperature records. Comparison of SSM/I data to profiles obtained during the 1995 Alfred Wegener Institut North Greenland Traverse field season shows that iiiSO data from snow in north central Greenland are a reliable, high-resolution temperature proxy. This enables determination of accumulation amount, rate, and timing from approximately July 1991 through June 1995 across this 220- km-long transect of the ice sheet. Precipitation estimates derived from early modeling based on European Centre for Medium-Range Weather Forecasts data show a similar average seasonal pattern but a diminished magnitude of accumulation (-56%) for these sites. The slope of the multiyear T versus iii correlation was evaluated for each site on the basis of the observed and calculated temperature history from the nearby North Greenland Ice core Project (NGRIP) site automatic weather station. These data should assist interpretation of the paleoclimatic record in the NGRIP deep core.