A 340 year record of biogenic sulphur from the Weddell Sea area, Antarctica
A 340 year record of biogenic sulphur from the Weddell Sea area, Antarctica
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南极洲威德尔海地区 340 年的生物硫记录
DOI：
10.3189/s0260305500015779
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发表时间：
1995
影响因子：
2.9
通讯作者：
P. Whung
中科院分区：
文献类型：
--
作者：
E. C. Pasteur;R. Mulvaney;David A. Peel;Eric S. Saltzman;P. Whung
在南极半岛东岸(70°35.2‘S，60°55.5’W)的多尔曼岛(70°35.2‘S，60°55.5’W)的冰芯中，获得了甲烷磺酸(MSA)和非海盐硫酸盐(NSSSO42)的详细记录。提供了1652-1992年期间MSA的年平均浓度。年平均浓度为0.69μeq L−1(σ=0.33，n=340)，变化范围为0.13-2.35μeq L−1，msa/nss-SO42−比值为0.22。MSA的高浓度反映了韦德尔海的邻近，据信韦德尔海是海洋浮游植物产量较高的地区。NSS-SO42−的总平均浓度约占降雪过程中总硫酸盐的66%。MSA和氧同位素信号的低频变化密切相关，表明它们可能受到类似的大气过程的调制。氧同位素特征与MSA(r=0.4 1)和NSS SO42−(r=0.5 0)呈正相关，达99%显著水平。自1902年以来，在南奥克尼斯岛的Scotia Bay，Laurie Island，Scotia Bay，Laurie Island，Scotia Bay，NSS SO42-r=-0.29(MSA r=-0.23，NSS SO42-r=-0.29；95%置信度显著)的海冰持续时间与这两个物种之间存在着很小的负相关。在该地点没有观察到高MSA浓度与厄尔尼诺事件之间的显著联系。
Detailed records of methanesulphonic acid (MSA) and non-sea-salt sulphate (nss SO4 2−) have been obtained from ice cores drilled on Dolleman Island on the east coast of the Antarctic Peninsula (70°35.2′S, 60°55.5′W). Annual average concentrations of MSA are presented for the period 1652–1992. Over this time span, the mean annual concentration of MSA is 0.69 μeq l−1 (σ = 0.33, n = 340), the range is 0.13–2.35μeq l−1, and the MSA/nss-SO4 2− ratio is 0.22. The high MSA concentration reflects the proximity of the Weddell Sea, believed to be a region of high marine phytoplankton production. The overall mean nss-SO4 2− concentration is about 66% of the total sulphate deposited in the snowfall. Low-frequency variations of MSA and oxygen-isotope signals correlate closely, indicating that they may be modulated by similar atmospheric processes. Positive correlations are observed between the oxygen-isotope signature and both MSA (r = 0.41) and nss SO4 2− (r = 0.50), significant at the 99% level. A small negative correlation can be seen between both species and the annual duration of sea ice at Scotia Bay, Laurie Island in the South Orkneys, since 1902 (MSA r= –0.23, and nss SO4 2– r = –0.29; significant at 95% confidence). No significant link between high MSA concentrations and El Niño events is observed at this location.