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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >DEPOSITION OF PB-210 TO THE AGASSIZ ICE CAP, CANADA
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DEPOSITION OF PB-210 TO THE AGASSIZ ICE CAP, CANADA

机译：将PB-210沉积到加拿大的阿加西斯冰帽上

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A record of the annual Pb-210 deposition to an Arctic glacier for the past 30 years has been obtained. Samples representing discrete annual layers of accumulated snowfall from the period 1963 to 1993 were collected from a snow pit on the Agassiz Ice Cap, Ellesmere Island, Canada (80 degrees 49'N, 72 degrees 56'W). The annual layers were independently and accurately dated using stratigraphic comparison and electrical conductivity measurements. This allowed the testing for accuracy of the constant initial concentration (CIC) model used for determining Pb-210 chronologies, The measured mean annual concentration and flux (+/-1 s.d.) of Pb-210 to the ice cap for the 30-year period were determined to be 44 (+/-19) mBq L(-1) and 5.1 (+/-2.4) Bq m(-2) y(-1), respectively, and the measured mean accumulation rate was 113 (+/-31) mm y(-1) Despite the high variability of the Pb-210 data, the CIC model proved to be accurate, yielding corresponding mean values of 40, 4.4, and 110, respectively. The CIC model also predicted values of the age of firn layers to within approximately +/-1 year of the observed ages determined for the 30-year period, No evidence of a dependence of deposition of Pb-210 on the mass accumulation of snow was found. A better understanding of Pb-210 and snow accumulation would be achieved by further studies using a more intensive sampling regime. [References: 21]
机译：已经获得了过去30年中每年向北极冰川沉积Pb-210的记录。从加拿大Ellesmere岛的Agassiz冰帽上的一个雪坑（80度49'N，72度56'W）中收集了代表1963年至1993年期间逐年累积降雪量的样本。使用地层比较和电导率测量，对独立的年层进行了准确而准确的测年。这样就可以测试用于确定Pb-210时间序列的恒定初始浓度（CIC）模型的准确性，测得的30年中Pb-210到冰帽的年平均浓度和通量（+/- 1 sd）周期分别确定为44（+/- 19）mBq L（-1）和5.1（+/- 2.4）Bq m（-2）y（-1），测得的平均累积速率为113（+ / -31）mm y（-1）尽管Pb-210数据变化很大，但CIC模型被证明是准确的，分别产生相应的平均值40、4.4和110。 CIC模型还预测了烧成层的年龄值，在为30年确定的观测年龄的大约+/- 1年内。没有证据表明Pb-210的沉积与积雪有关。找到了。通过使用更深入的采样方案进行进一步研究，可以更好地了解Pb-210和积雪。 [参考：21]

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