Temporal and spatial changes in the environmental lapse rate distribution over the Arctic

zelu zhang, J. Bamber, Ádám Ignéczi
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Abstract

The Environmental Lapse Rate (ELR) depicts how the temperature near the surface varies with altitude and can be used for temperature downscaling coarse resolution data and for understanding boundary layer processes. We calculated the ELR using ERA5 reanalysis data, examined its temporal and larger-scale spatial variability, and found a prevalent seasonal ELR cycle over the Arctic. There are extensive positive ELR values resulting from pervasive inversions over most of the Arctic in winter; hence, we also explored the possible factors that lead to inversions in polar regions. Our results can serve as a reference for future research on the inversions in different morphological regions at different pressure levels. By improving the characterization of the ELR, we obtain a more explicit representation of the vertical temperature variation across the Arctic region and examine potential trends in ELR over time. Our results challenge the commonly assumed fixed ELR values that are typically used in the Arctic region in, for example, correcting ice-core temperature reconstructions or estimating higher-resolution runoff from land ice.
北极上空环境失效率分布的时空变化
环境塌缩率(ELR)描述了近地面温度随高度变化的情况,可用于温度降尺度粗分辨率数据和了解边界层过程。我们利用ERA5再分析数据计算了ELR,研究了其时间和更大尺度空间的变化,发现北极上空普遍存在一个ELR季节周期。冬季北极大部分地区普遍存在的逆转现象导致了大量正的 ELR 值;因此,我们还探讨了导致极地地区逆转的可能因素。我们的研究结果可为今后研究不同气压水平下不同形态区域的逆转现象提供参考。通过改进 ELR 的表征,我们获得了整个北极地区垂直温度变化的更清晰表征,并研究了 ELR 随时间变化的潜在趋势。我们的研究结果对通常假定的固定 ELR 值提出了挑战,这些值通常用于北极地区的冰芯温度重建校正或估算更高分辨率的陆冰径流。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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