Assessment of simulated aerosol effective radiative forcings in the terrestrial spectrum
Assessment of simulated aerosol effective radiative forcings in the terrestrial spectrum
复制标题
地面光谱中模拟气溶胶有效辐射强迫的评估
DOI：
10.1002/2016gl071975
复制
发表时间：
2017
影响因子：
5.2
通讯作者：
J. Quaas
中科院分区：
文献类型：
--
作者：
I. Heyn;K. Block;J. Mülmenstädt;E. Gryspeerdt;Philipp Kühne;M. Salzmann;J. Quaas
政府间气候变化专门委员会在其第五次评估报告（AR 5）中提供了对人为气溶胶产生的有效辐射强迫（ERF）的最佳估计，其数值为−0.9 W m−2。这个值比AR 4中的估计值-1.2 W m-2要弱得多。部分差异可以用+0.2 W m−2的偏移量来解释，AR 5将该偏移量添加到所有仅考虑太阳光谱的已发表估计值中，以考虑地球光谱的调整。我们发现，在CMIP 5多模式中值中，地面光谱中的ERF很小，除非对冰和混合相云的微物理效应进行参数化。在后一种情况下，它很大，但伴随着太阳光谱中非常强的电流变场。总的调节可以分为微物理调节（气溶胶“效应”）和热力学调节。使用内核技术，我们量化后者，发现水蒸气和温度分布的快速热力学调整是小的。迫切需要对这些模型结果进行基于观测的约束。
In its fifth assessment report (AR5), the Intergovernmental Panel on Climate Change provides a best estimate of the effective radiative forcing (ERF) due to anthropogenic aerosol at −0.9 W m−2. This value is considerably weaker than the estimate of −1.2 W m−2 in AR4. A part of the difference can be explained by an offset of +0.2 W m−2 which AR5 added to all published estimates that only considered the solar spectrum, in order to account for adjustments in the terrestrial spectrum. We find that, in the CMIP5 multimodel median, the ERF in the terrestrial spectrum is small, unless microphysical effects on ice‐ and mixed‐phase clouds are parameterized. In the latter case it is large but accompanied by a very strong ERF in the solar spectrum. The total adjustments can be separated into microphysical adjustments (aerosol “effects”) and thermodynamic adjustments. Using a kernel technique, we quantify the latter and find that the rapid thermodynamic adjustments of water vapor and temperature profiles are small. Observation‐based constraints on these model results are urgently needed.