Imprint of large‐scale atmospheric transport patterns on sea‐salt records in northern Greenland ice cores
Imprint of large‐scale atmospheric transport patterns on sea‐salt records in northern Greenland ice cores
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DOI：
10.1029/2000jd000175
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发表时间：
2001-10
影响因子：
--
通讯作者：
H. Fischer
中科院分区：
文献类型：
--
作者：
H. Fischer
研究了格陵兰北部冰芯海盐气溶胶浓度的年代际变化，并与1959-1993年间的气象再分析资料进行了对比。对500mbar海平面气压和位势高度的平均数据进行的相关分析表明，东太平洋和东北太平洋地区是导致格陵兰冰盖上海盐气溶胶出口变化的最重要的行动中心，这与太平洋/北美遥相关模式有关。然而，大西洋地区似乎只是次要的。相关系数在今年第一季度最高，但对于年气压数据也很重要，解释了冰芯海盐变化的∼20%。此外，太平洋活动中心和北大西洋的风暴活动增加，导致格陵兰北部的海盐浓度增加，这可以解释约40%和17%的冰芯变化。在19世纪期间，格陵兰岛东北部600年的海盐记录增加了30%，这至少部分可以被解释为在此期间太平洋地区海盐出口的增加。
The decadal to interannual variability of sea-salt aerosol concentrations in northern Greenland ice cores is investigated and contrasted to meteorological reanalysis data over the time span 1959–1993. Correlation analysis with average data on sea level pressure and geopotential height at the 500 mbar level identifies the eastern and northeastern Pacific region as the most important center of action responsible for variations in sea-salt aerosol export onto the Greenland ice sheet which is related to the Pacific/North American teleconnection pattern. The Atlantic region, however, appears to be of secondary importance only. Correlation coefficients are highest during the first quarter of the year but also significant for annual pressure data, explaining ∼20% of the sea-salt variance in the ice cores. Furthermore, higher storm activity in the Pacific center of action, as well as in the northern Atlantic, leads to higher sea-salt concentrations in northern Greenland, explaining about 40% and 17% of the ice core variance. A 30% increase during the nineteenth century in a 600 year sea-salt record from northeastern Greenland may be interpreted, at least in part, as an enhancement of sea-salt export from the Pacific region during that time.