The Curious Nature of the Hemispheric Symmetry of the Earth’s Water and Energy Balances

The Curious Nature of the Hemispheric Symmetry of the Earth’s Water and Energy Balances
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地球水和能量平衡的半球对称性的奇妙本质

DOI:
10.1007/s40641-016-0043-9
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发表时间:
2016
影响因子:
9.5
通讯作者:
Webster, PJ
Webster, PJ
中科院分区:
地球科学1区
文献类型:
--
作者:
Stephens, GL;Hakuba, M.Z.;Hawcroft, MJ;Haywood, JM;Behrangi, AS;Kay, JE;Webster, PJ

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本文提出了新的估计半球能量平衡的基础上组装的辐射通量和海洋热量数据。此外,它提供了一个全面的耦合气候模式,以调查其代表性的作用,造成热带降水偏差最近的模拟概述。这里描绘的能量平衡具有一个小的半球不平衡,南半球吸收的能量略多。这就产生了一个朝向北半球的净热量输送,包括海洋向北的跨赤道热量输送和大气中向南的热流。湍流通量和半球降水平衡到约3 Wm− 2,北半球的总累积量略大。CloudSat数据表明,SH的降水更频繁,这意味着NH的降水更强烈。完全耦合的气候模式模拟表明,减少半球的能量平衡偏差并没有减少热带降水的现有偏差。
This paper presents new estimates of the hemispheric energy balance based on an assembly of radiative flux and ocean heat data. Further, it provides an overview of recent simulations with fully coupled climate models to investigate the role of its representation in causing tropical precipitation biases. The energy balance portrayed here features a small hemispheric imbalance with slightly more energy being absorbed by the Southern hemisphere. This yields a net transport of heat towards the NH composing of a northward cross-equatorial heat transport by the oceans and a southward heat flow in the atmosphere. The turbulent fluxes and hemispheric precipitation balance to about 3 Wm−2with slightly larger total accumulation occurring in the NH. CloudSat data indicate more frequent precipitation in the SH implying more intense precipitation in the NH. Fully coupled climate model simulations show that reducing hemispheric energy balance biases does little to reduce existing biases in tropical precipitation.
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