scholarly journals A multilevel ocean mixed layer model resolving the diurnal cycle: Development and validation

2015 ◽  
Vol 7 (4) ◽  
pp. 1680-1692 ◽  
Author(s):  
Tiejun Ling ◽  
Min Xu ◽  
Xin-Zhong Liang ◽  
Julian X. L. Wang ◽  
Yign Noh
Keyword(s):  
Mixed Layer ◽  
Diurnal Cycle ◽  
Ocean Mixed Layer ◽  
Layer Model ◽  
Development And Validation ◽  
Mixed Layer Model

scholarly journals Simulation of More Realistic Upper-Ocean Processes from an OGCM with a New Ocean Mixed Layer Model

2002 ◽  
Vol 32 (5) ◽  
pp. 1284-1307 ◽  
Author(s):  
Yign Noh ◽  
Chan Joo Jang ◽  
Toshio Yamagata ◽  
Peter C. Chu ◽  
Cheol-Ho Kim
Keyword(s):  
Mixed Layer ◽  
Upper Ocean ◽  
Ocean Mixed Layer ◽  
Layer Model ◽  
Mixed Layer Model ◽  
Ocean Processes

scholarly journals Parameterization of Langmuir Circulation in the Ocean Mixed Layer Model Using LES and Its Application to the OGCM

2016 ◽  
Vol 46 (1) ◽  
pp. 57-78 ◽  
Author(s):  
Yign Noh ◽  
Hyejin Ok ◽  
Eunjeong Lee ◽  
Takahiro Toyoda ◽  
Naoki Hirose
Keyword(s):  
Mixed Layer ◽  
High Latitude ◽  
General Circulation ◽  
Circulation Model ◽  
Langmuir Circulation ◽  
Ocean Mixed Layer ◽  
Layer Model ◽  
Tropical Ocean ◽  
Common Error ◽  
Mixed Layer Model

AbstractThe effect of Langmuir circulation (LC) on vertical mixing is parameterized in the ocean mixed layer model (OMLM), based on the analysis of large-eddy simulation (LES) results. Parameterization of LC effects is carried out in terms of the modifications of the mixing length scale as well as the inclusion of the contribution from the Stokes force in momentum and TKE equations. The performance of the new OMLM is examined by comparing with LES results, together with sensitivity tests for empirical constants used in the parameterization. The new OMLM is then applied to the ocean general circulation model (OGCM) Meteorological Research Institute Community Ocean Model (MRI.COM), and its effect is investigated. The new OMLM helps to correct too shallow mixed layer depths (MLDs) in the high-latitude ocean, which has been a common error in most OGCMs, without making the thermocline in the tropical ocean more diffused. The parameterization of LC effects is found to affect mainly the high-latitude ocean, in which the MLD is shallow in summer and stratification is weak in winter.

scholarly journals How important is the vertical structure for the representation of aerosol impacts on the diurnal cycle of marine stratocumulus?

2009 ◽  
Vol 9 (2) ◽  
pp. 5465-5503 ◽  
Author(s):  
I. Sandu ◽  
J.-L. Brenguier ◽  
O. Thouron ◽  
B. Stevens
Keyword(s):  
Boundary Layer ◽  
Mixed Layer ◽  
Diurnal Cycle ◽  
Liquid Water ◽  
Vertical Stratification ◽  
Layer Model ◽  
Liquid Water Path ◽  
Marine Stratocumulus ◽  
Water Path ◽  
Mixed Layer Model

Abstract. Large Eddy Simulations (LES) are performed to examine the impact of hygroscopic aerosols on the diurnal cycle of marine stratocumulus clouds, under varying meteorological forcing conditions. When the cloud condensation nuclei concentration increase is sufficient to inhibit drizzle formation in the cloud layer, the precipitating and the non-precipitating cloud layers exhibit contrasting evolutions, with noticeable differences in liquid water path. Aerosol induced modifications of the droplet sedimentation and drizzle precipitation result in noticeable changes of the entrainment velocity at cloud top, but also in significant changes of the vertical stratification in the boundary layer. This set of simulations is then used to evaluate whether a model which does not explicitly represent the effects of the interactions occurring within the boundary layer on its vertical stratification (i.e. such as a mixed layer model) is capable of reproducing at least the sign, if not the amplitude, of these aerosol impacts on the liquid water path. It is shown that the deviations from the mixed layer idealized state are crucial ingredients of the aerosol impacts so that a mixed layer model is unable to even replicate the sign of the liquid water path changes.

Sign in / Sign up

Export Citation Format

Share Document