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首页> 外文期刊>Geophysical Research Letters >Arctic Sea-Ice Variability During the Instrumental Era
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Arctic Sea-Ice Variability During the Instrumental Era

机译:仪器时代的北极海冰变异

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Arctic sea-ice extent (SIE) has declined drastically in recent decades, yet its evolution prior to the satellite era is highly uncertain. Studies using SIE observations find little variability prior to the 1970s; however, these reconstructions are based on limited data, especially prior to the 1950s. We use ensemble Kalman filter data assimilation of surface air temperature observations with Last Millennium climate model simulations to create a fully gridded Arctic sea-ice concentration reconstruction from 1850 to 2018 and investigate the evolution of Arctic SIE during this period. We find a decline of similar to 1.25x10(6) km(2) during the early 20th-century warming (1910-1940). The 25-year trends during this period are similar to 33-38% smaller than the satellite era (1979-2018) but almost twice as large as previous estimates. Additionally, we find that variability of SIE on decadal timescales prior to the satellite era is similar to 40% greater than previously estimated.
机译:北极海冰范围(SIE)近几十年来急剧下降,但它在卫星时代之前的演变是非常不确定的。 使用SIE观测的研究在20世纪70年代之前发现了几乎没有变化; 然而,这些重建基于有限的数据,特别是在20世纪50年代之前。 我们使用与最后一千年气候模型模拟的表面空气温度观测集合卡尔曼滤波器数据同化,从1850年至2018年创建完全包装的北极海冰浓缩重建,并在此期间调查北极筛的演变。 在20世纪初的变暖期间,我们发现类似于1.25x10(6)公里(2)的下降(1910-1940)。 这一时期的25年趋势与卫星时代小33-38%(1979-2018),但几乎是以前估计的两倍。 此外,我们发现卫星时代之前的Decadal时间尺度筛子的变异性比以前估计的40%相似。

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