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A basic effect of cloud radiative effects on tropical sea surface temperature variability

机译：云辐射效应对热带海面温度变异性的基本效果

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摘要

Cloud radiative effects (CREs) are known to play a central role in governing the long-term mean distribution of sea surface temperatures (SSTs). Very recent work suggests that CREs may also play a role in governing the variability of SSTs in the context of El Nino-Southern Oscillation. Here, the authors exploit numerical simulations in the Max Planck Institute Earth System Model with two different representations of CREs to demonstrate that coupling between CREs and the atmospheric circulation has a much more general and widespread effect on tropical climate than that indicated in previous work. The results reveal that coupling between CREs and the atmospheric circulation leads to robust increases in SST variability on time scales longer than a month throughout the tropical oceans. Remarkably, cloud-circulation coupling leads to more than a doubling of the amplitude of decadal-scale variability in tropical-mean SSTs. It is argued that the increases in tropical SST variance derive primarily from the coupling between SSTs and shortwave CREs: Coupling increases the memory in shortwave CREs on hourly and daily time scales and thus reddens the spectrum of shortwave CREs and increases their variance on time scales spanning weeks to decades. Coupling between SSTs and CREs does not noticeably affect the variance of SSTs in the extratropics, where the effects from variability in CREs on the surface energy budget are much smaller than the effects from the turbulent heat fluxes. The results indicate a basic but critical role of CREs in climate variability throughout the tropics.
机译：已知云辐射效应（CRES）在控制海面温度（SSTS）的长期平均分布方面发挥着核心作用。最近的工作表明，CRE也可能在埃尔尼南振荡的背景下管理SST的可变性作用。在这里，作者利用了最大普朗克研究所地球系统模型的数值模拟，具有两种不同的CRE表示，以证明CRE与大气循环之间的耦合具有比以前的工作中所示的更为一般和广泛的影响。结果表明，CRE和大气循环之间的耦合导致SST可变性的强劲增加，时间尺度超过整个热带海洋的一个月。值得注意的是，云循环耦合导致热带平均SST中的十二型尺度变异性的大幅增加。有人认为，热带SST方差的增加主要来自SST和短波之间的耦合：耦合在每小时和日常时间尺度上增加了短波CRE中的内存，从而缩小了短波克雷斯的频谱，并增加了跨越时间尺度的差异几十年到几十年。 SST和CRE之间的耦合并不明显影响越野管中SST的方差，其中表面能预算中的CRES的效果远小于来自湍流热通量的效果。结果表明，在整个热带地带的气候变异性中的基本但重要的作用。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2116-2116|共1页
  • 作者

    L.I. Ying; D.W.J. Thompson; D. Olonscheck;

  • 作者单位

    Department of Atmospheric Science Colorado State University Fort Collins CO United States;

    Department of Atmospheric Science Colorado State University Fort Collins CO United States;

    Department of Atmospheric Science Colorado State University Fort Collins CO United States;

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  • 正文语种 eng
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