The Life Cycle and Net Radiative Effect of Tropical Anvil Clouds
The Life Cycle and Net Radiative Effect of Tropical Anvil Clouds
复制标题
热带砧云的生命周期和净辐射效应
DOI：
10.1029/2018ms001484
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发表时间：
2018
影响因子：
6.8
通讯作者：
Blossey, Peter N.
中科院分区：
文献类型：
--
作者：
Hartmann, Dennis L.;Gasparini, Blaž;Berry, Sara E.;Blossey, Peter N.
我们探讨了热带对流系统产生弱净云辐射效应（NCRE）时脱轨热带砧云的生命周期的重要性。我们使用大气建模系统云解析模型在二维框架中模拟水平均匀的高架冰云。最初较厚的云产生负 NCRE，随后随着云变薄并上升，该负 NCRE 被正 NCRE 抵消。关闭交互式云辐射表明云辐射加热和云内对流是驱动净辐射中性的基础。云内对流的作用是使最初厚的砧云变薄，并使卷云升高并保持薄薄的。砧云的维持与空气团在云层内垂直循环时通过升华、成核和沉积来回收水蒸气和云冰有关。如果没有交互辐射，云就会沉积并升华，产生大量的负 NCRE。云微物理的规范在很大程度上影响云的行为和生命周期，但生命周期产生补偿云辐射效应的趋势对于微物理的实质性变化是稳健的。我们的研究表明，上层冰云内的小规模过程可能对与热带对流云系统相关的 NCRE 产生强烈影响。
We explore the importance of the life cycle of detrained tropical anvil clouds in producing a weak net cloud radiative effect (NCRE) by tropical convective systems. We simulate a horizontally homogeneous elevated ice cloud in a 2‐D framework using the System for Atmospheric Modeling cloud‐resolving model. The initially thick cloud produces a negative NCRE, which is later canceled by a positive NCRE as the cloud thins and rises. Turning off interactive cloud radiation reveals that cloud radiative heating and in‐cloud convection are fundamental in driving net radiative neutrality. In‐cloud convection acts to thin initially thick anvil clouds and loft and maintain thin cirrus. The maintenance of anvil clouds is tied to the recycling of water vapor and cloud ice through sublimation, nucleation, and deposition as air parcels circulate vertically within the cloud layer. Without interactive radiation, the cloud sediments and sublimates away, producing a large negative NCRE. The specification of cloud microphysics substantially influences the cloud's behavior and life cycle , but the tendency of the life cycle to produce compensating cloud radiative effects is robust to substantial changes in the microphysics. Our study shows that small‐scale processes within upper level ice clouds likely have a strong influence on the NCRE associated with tropical convective cloud systems.
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影响因子：
4.9
作者：
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通讯作者：
Hartmann, Dennis L.
DOI：
--
发表时间：
1994
期刊：
影响因子：
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影响因子：
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作者：
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