In most fully coupled climate models, the net radiative feedback magnitude decreases with time after abruptly quadrupling CO₂. Hypotheses have been raised to explain the time dependence of radiative feedbacks, including the influence from surface warming pattern and ocean heat uptake (OHU) pattern. By using the Green's Function derived from pairs of simulations in the atmospheric model (CAM5) coupled with a slab‐ocean, with each simulation being forced by a localized surface heat flux anomaly, we evaluate the influences of regional OHU on transient surface warming pattern, accounting for the changes in radiative feedbacks. The attribution of the time‐evolving net radiative feedback highlights the remote impact from OHU over the Southern Ocean on tropical sea surface temperature. The time‐dependent weakening of OHU over the Southern Ocean gives rise to increasingly enhanced surface warming in southeastern Pacific, which leads to decreasing tropospheric stability and more positive cloud feedback decades after quadrupling CO₂.

中文翻译：

---

CESM中南大洋热量吸收对时间演化辐射反馈的主要贡献

在大多数完全耦合的气候模型中，CO ₂突然增加三倍后，净辐射反馈量随时间降低。提出了假说来解释辐射反馈的时间依赖性，包括地表变暖模式和海洋热量吸收（OHU）模式的影响。通过使用从大气模型（CAM5）中的成对模拟与平板海洋耦合得到的格林函数，每个模拟都是由局部表面热通量异常强迫的，我们评估了区域OHU对瞬时表面变暖模式的影响，解释辐射反馈的变化。时空演化的净辐射反馈的特征突显了OHU在南大洋上对热带海面温度的遥远影响。随着时间的流逝，南大洋上OHU的减弱导致东南太平洋的地表升温日益加剧，₂。