Calibration of an ice-core glaciochemical (sea-salt) record with Sea-ice variability in the Canadian Arctic
Calibration of an ice-core glaciochemical (sea-salt) record with Sea-ice variability in the Canadian Arctic
复制标题
加拿大北极地区冰芯冰川化学（海盐）记录与海冰变化的校准
作者：
C. Kinnard;C. Zdanowicz;D. Fisher;C. Wake
加拿大努纳武特德文冰帽冰芯冰川化学时间序列与海冰浓度格点时间序列的相关性显示，1980 - 1997年巴芬湾冰芯和海冰中海盐浓度（主要为Na+、Mg2+和Cl -）呈显著负相关。对各主要离子的经验正交函数（Eof）分析表明，冰川化学变率的主导模态（Eof1）代表一个海盐信号，与巴芬湾海冰浓度相关性最好。从季节上看，巴芬湾的反相关关系在秋季最强，空间上最广泛，其次是春季、夏季和冬季。这些结果支持了巴芬湾在风暴季节（秋季和春季）开放水域条件的增加促进了德文冰盖上海盐气溶胶的产生、运输和沉积的增加。将Eof1、δ18O和融化率的冰芯时间序列与格陵兰乌佩纳维克记录的气温进行比较，表明巴芬湾过去∽145年的冰盖变化是动态控制的，而不是热动力学控制的。气旋环流的加强导致开阔水域条件的增加，德文冰帽的海盐通量更大。
Abstract Correlation between glaciochemical time Series from an ice core collected on Devon Ice Cap, Nunavut, Canada, and gridded time Series of Sea-ice concentrations reveals Statistically Significant inverse relationships between Sea-salt concentrations (mainly Na+, Mg2+ and Cl–) in the ice core and Sea-ice cover in Baffin Bay over the period 1980–97. An empirical orthogonal function (Eof) analysis performed on all major ions Shows that the dominant mode of glaciochemical variability (Eof1) represents a Sea-salt Signal, which correlates best with Sea-ice concentration in Baffin Bay. On a Seasonal basis, the Strongest and most Spatially extensive anticorrelations are found in Baffin Bay during the fall, followed by Spring, Summer and winter. These results Support the notion that increased open-water conditions in Baffin Bay during the Stormy Seasons (fall and Spring) promote increased production, transport and deposition of Sea-salt aerosols on Devon Ice Cap. Comparison of ice-core time Series of Eof1, δ18O and melt percentage, with air temperatures recorded in Upernavik, Greenland, Suggests that ice-cover variations in Baffin Bay over the past ∽145 years were dynamically rather than thermodynamically controlled, with periods of Strengthened cyclonic circulation leading to increased open-water conditions, and a greater Sea-salt flux on Devon Ice Cap.