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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Implications for Arctic amplification of changes in the strength of the water vapor feedback
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Implications for Arctic amplification of changes in the strength of the water vapor feedback

机译：北极放大水蒸气反馈强度变化的意义

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One of the major climatic changes apparent over the Arctic Ocean has been the amplified rate at which air temperature has been increasing relative to the global mean. There are multiple factors which play roles in this amplification, including changes in sea ice/albedo, atmospheric circulation, clouds, and water vapor. We investigate the positive feedback on temperature caused by increasing downward longwave radiation flux (DLF) associated with increasing atmospheric precipitable water (PW). The Japanese 25-year Reanalysis and ERA-Interim reanalysis are used to examine the role of the DLF/PW component of the water vapor feedback loop on the enhanced warming in the Arctic between 1979 and 2011. We find a nonlinear relationship between DLF and PW, which suggests that the sensitivity of DLF to changes in PW varies by season, with the highest in winter and the lowest in summer. The positive trends in DLF and PW are widespread over the Arctic during autumn and spring but are centered mainly over the Atlantic sector in winter. The strength of the PW feedback loop depends on both the sensitivity of DLF to changes in PW and the change in PW during 1979-2011. If, in the future, PW were to increase significantly during winter in the central and Pacific sectors of the Arctic, there could be an expansion of Arctic amplification during winter. We also examine the effect of changes in cloud cover and find that such changes account for a much smaller proportion of the changes in DLF than does PW. Key Points Arctic amplification may expand during winter due to DLF/PW feedback Relative importance of PW on changes in DLF varies spatially and seasonally Role of cloud cover in contributing to the changes in DLF is small
机译：北冰洋明显的主要气候变化之一是空气温度相对于全球平均值的增加速率。在这种放大作用中有多种因素起作用，包括海冰/反照率，大气环流，云和水蒸气的变化。我们调查了与大气可沉淀水（PW）增加相关的向下长波辐射通量（DLF）增加所引起的温度正反馈。日本进行了为期25年的再分析和ERA中期再分析，研究了水蒸气反馈回路的DLF / PW分量对1979年至2011年北极地区变暖的作用。我们发现DLF和PW之间存在非线性关系，这表明DLF对PW变化的敏感性随季节而变化，冬季最高，夏季最低。 DLF和PW的积极趋势在秋季和春季在北极地区广泛分布，但在冬季主要集中在大西洋地区。 PW反馈回路的强度取决于DLF对PW变化的敏感度以及1979-2011年期间PW变化的敏感性。如果将来北极中部和太平洋地区冬季的PW显着增加，那么冬季北极的放大率可能会扩大。我们还检查了云量变化的影响，发现与PW相比，此类变化在DLF变化中所占的比例要小得多。要点冬季，由于DLF / PW的反馈，北极的放大作用可能会扩大。PW对DLF变化的相对重要性在空间和季节上会有所变化。

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