常规和质量通量PBL方案模拟南大洋云边界层耦合三种模式的性能

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Xiao-Ming Hu, Greg M. McFarquhar, Bowen Zhou, Ming Xue
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引用次数: 0

摘要

海洋上的行星边界层(PBL)结构和模拟这种结构的模式能力不如陆地上的同类结构了解得好。本研究利用观测资料和WRF模拟资料研究了南大洋上空的边界层结构,重点研究了海洋边界层与上面云层之间的耦合。基于对流层下层垂直剖面和横截面,确定了三种云边界层耦合模式,包括一种具有弱正表面热通量的耦合模式(1型),以及两种存在负表面热通量驱动的浅稳定边界层(2型)或强正表面热通量(3型)的解耦模式。采用常规的YSU PBL方案(无云诱导自顶向下混合选项,简称YSUtopdown)、MYNN方案和综合处理混合层热云和浅对流云的MYNN涡旋扩散质量通量方案(MYNN- edmf)对各模式的代表性案例进行了数值模拟。MYNN-EDMF方案提供了解耦3型模态的最佳表示,其中其模拟不同垂直程度的局部混合和非局部质量通量的能力是必不可少的。还确定了MYNN-EDMF中决定浅云形成的两个关键参数。与YSU方案相比,YSUtopdown方案具有更深的边界层,并且在耦合型1模态下与观测值的一致性更好。对于解耦的2型模式,所有四种方案的性能都相似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance of Conventional and Mass-Flux PBL Schemes for Simulating Three Modes of Cloud-Boundary Layer Coupling Over the Southern Ocean

Planetary boundary layer (PBL) structure over the ocean and the model capability to simulate such structure are less well-understood than their counterparts over land. In this study, observations and WRF simulations are examined to study the boundary layer structure over the Southern Ocean, focusing on the coupling between the oceanic boundary layer and the cloud layer above. Based on the lower tropospheric vertical profiles and cross-sections, three cloud-boundary layer coupling modes are identified including a coupled mode with a weak positive surface heat flux (type 1), and two decoupled modes in the presence of either a negative surface heat flux driving a shallow stable boundary layer (type 2) or a strong positive surface heat flux (type 3). Numerical simulations are conducted for representative cases of each mode using the conventional YSU PBL scheme without and with the cloud-induced top-down mixing option (referred to as YSUtopdown), as well as the MYNN and the MYNN eddy-diffusivity mass-flux scheme (MYNN-EDMF) that adopts a holistic treatment of mixed-layer thermals and shallow convective clouds. The MYNN-EDMF scheme offers the best representation of the decoupled type 3 mode where its capability to simulate different vertical extents of local mixing and nonlocal mass flux is found to be essential. Two key parameters in MYNN-EDMF dictating shallow cloud formation are also identified. The YSUtopdown scheme develops a deeper boundary layer than the YSU scheme and exhibits more consistency with observations for the coupled type 1 mode. For the decoupled type 2 mode, all four schemes perform similarly well.

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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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