Recent studies have used satellite data to estimate the response of top‐of‐atmosphere (TOA) radiative fluxes to surface temperature changes in the Arctic. The satellite‐observed radiative response is indicative of Arctic climate sensitivity that determines future Arctic warming. However, it remains ambiguous whether the satellite‐observed radiative response is invariable because the time period covered by satellite data reflects a rapidly changing transient Arctic climate state with considerable sea ice loss. Using NASA's Clouds and Earth's Radiant Energy System (CERES) observations from 2000 to 2018, this study evaluates the invariability of the radiative response by comparing the radiative response of the high sea ice concentration (SIC) period to that of the low SIC period. The results show that the net radiative response remains approximately unchanged regardless of the SIC (−0.19 ± 0.44 and 0.15 ± 0.16 W m⁻² K⁻¹ for high and low SIC periods, respectively). In addition, seven of the 11 models from the Coupled Model Intercomparison Project Phase 6 (CMIP6) demonstrated that the modeled radiative responses are stable. The ERA‐interim reanalysis estimates show that regionally confined changes in individual radiative feedbacks such as albedo, lapse rate, water vapor, and clouds do not vary considerably. Consequently, we infer that the radiative response in the Arctic may remain stable even under rapid Arctic climate change. Hence, the Arctic climate sensitivity can be quantified with present satellite observations.

中文翻译：

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北极大气顶辐射对表面温度变化的不变性

最近的研究已经使用卫星数据来估计大气顶（TOA）辐射通量对北极表面温度变化的响应。卫星观测到的辐射响应表明北极的气候敏感性决定了未来北极的变暖。但是，由于卫星数据覆盖的时间段反映了迅速变化的北极瞬态气候状态以及大量的海冰损失，因此卫星观测到的辐射响应是否恒定尚不明确。本研究使用美国宇航局（NASA）2000年至2018年的云和地球辐射能系统（CERES）观测结果，通过比较高海冰浓度（SIC）时期和低SIC时期的辐射响应来评估辐射响应的不变性。^-2  K ^-1分别用于高和低SIC周期。此外，耦合模型比较项目第6阶段（CMIP6）的11个模型中有7个证明了模型的辐射响应是稳定的。ERA中期再分析估计表明，单个辐射反馈（如反照率，流失率，水蒸气和云）的区域限制变化并没有太大变化。因此，我们推断，即使在迅速的北极气候变化下，北极的辐射响应也可能保持稳定。因此，北极的气候敏感性可以通过目前的卫星观测来量化。