Article
Environmental Sciences
Ji Hao, Jie Yang, Ge Chen
Summary: Mesoscale eddies are widely distributed in the global ocean and greatly influence the spatiotemporal evolution of mixed layer depth (MLD). In this study, a method was proposed to identify abnormal eddies using potential density based on 15 years of Argo data. The results showed that abnormal anticyclonic eddies (AAE) and abnormal cyclonic eddies (ACE) accounted for a significant proportion of the total matching eddies.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
D. Avisar, R. Pelta, A. Chudnovsky, D. Rostkier-Edelstein
Summary: This study implemented and verified four urban configurations of the Weather Research and Forecasting model for the coastal metropolitan area of Tel-Aviv, focusing on the mesoscale summertime flow dynamics and the role of urban canopy in hodograph dynamics at night. The simulations showed that the MM and SLUCM configurations were more accurate for diurnal temperature and wind cycles, while SLUCM exhibited lower skill in wind speed and BEP underestimated 2-m temperature. The study suggests a need for reexamination of the SLUCM wind speed parameterization.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Geosciences, Multidisciplinary
C. E. Phillips, U. S. Nair, R. Mahmood, E. Rappin, R. A. Pielke
Summary: By analyzing comprehensive observations from the 2018 Great Plains Irrigation Experiment, it is found that irrigation has an impact on weather and climate. Irrigation reduces the pressure gradient force induced by terrain and the upslope wind in the afternoon and evening. It also weakens the turbulent transport of momentum, which has the potential to affect moisture transport and cloud and precipitation formation over the Great Plains.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Oceanography
Qian Shi, Guihua Wang
Summary: Both observations and an idealized model have shown that the path of a western boundary current, like the Kuroshio, can be perturbed by the impingement of an ocean eddy. The subsequent disruption occurs primarily near the interaction region and propagates downstream, forming a dissipating wavelike fluctuation. The spatial-temporal evolution of Kuroshio axis shift by impinging eddy is determined by two nondimensional factors: the ratio of eddy strength to the Kuroshio strength; and the ratio of horizontal shearing strength in the background to that in the current.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geosciences, Multidisciplinary
Yu Cheng, Kaighin A. Mccoll
Summary: Deforestation, urbanization and construction of wind farms can change land surface roughness and influence surface heat fluxes, weather and climate. Anomalies in land surface roughness can trigger convergence and cause mesoscale circulations and anomalous precipitation. This mechanism is not present in climate models and may be relevant to storm formation over wind farms, cities and forests.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Mengrong Ding, Hailong Liu, Pengfei Lin, Aixue Hu, Yao Meng, Yiwen Li, Kexiu Liu
Summary: The performance of eddy-resolving global ocean-sea ice models in simulating mesoscale eddies is evaluated, revealing an overestimation of energy intensity in eddy-rich regions and an underestimation of eddy kinetic energy in eddy-poor regions.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Zhiwei Zhang, Yuelin Liu, Bo Qiu, Yiyong Luo, Wenju Cai, Qingguo Yuan, Yinxing Liu, Hong Zhang, Hailong Liu, Mingfang Miao, Jinchao Zhang, Wei Zhao, Jiwei Tian
Summary: Based on two high-resolution simulations, the authors find that submesoscale eddies significantly boost poleward oceanic heat transport in Antarctic waters by strengthening transport capability of mesoscale eddies through inverse energy cascade.
NATURE COMMUNICATIONS
(2023)
Article
Meteorology & Atmospheric Sciences
Jan Kazil, Matthew W. Christensen, Steven J. Abel, Takanobu Yamaguchi, Graham Feingold
Summary: This study presents an approach to drive Lagrangian large eddy simulation (LES) of boundary layer clouds with reanalysis data, successfully simulating the morphological evolution of observed clouds and capturing the timing of cloud state transition. The simulations reproduce cloud microphysical properties reasonably well, but overestimate certain parameters in the precipitating state.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2021)
Article
Meteorology & Atmospheric Sciences
Hongjun Liu, Zhiyong Meng, Yuning Zhu, Yipeng Huang
Summary: Convection initiation (CI) is a challenge in weather forecasting. This study investigated the evolution of a boundary in the Hetao area in North China, and its influence on the CI process. The results showed that uneven surface heating produced mesoscale thermal circulation, and a westerly trough enhanced uplift and CI. The simulation revealed that the first 30-dBZ parcels in each cell originated from either the desert side at a low level or the oasis side at a middle level.
MONTHLY WEATHER REVIEW
(2023)
Article
Geosciences, Multidisciplinary
S. M. Hamze-Ziabari, A. M. Razmi, U. Lemmin, D. A. Barry
Summary: Submesoscale filaments have been found in Lake Geneva for the first time based on high-resolution 3D numerical simulations, field observations, and remote sensing imagery. These filaments are formed during summertime and have significant impacts on the biophysical processes in the lake.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Oceanography
William G. Large, Edward G. Patton, Peter P. Sullivan
Summary: Empirical rules for entrainment and detrainment are developed based on LES of the Southern Ocean boundary layer, taking into account turbulence, stratification, and shear, as well as the influence of diurnal variability and Stokes drift. These rules address the failure of downgradient eddy viscosity and provide parameterizations for momentum flux. The response of the boundary layer to diurnal heating includes collapse and growth, with the depth of the boundary layer empirically related to forcing history. Evaluation against LES fluxes shows that flux profiles are more representative of the diurnal cycle, especially with Stokes drift.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Jinyuan Xin, Yongjing Ma, Dandan Zhao, Chongshui Gong, Xinbing Ren, Guiqian Tang, Xiangao Xia, Zifa Wang, Junji Cao, Jordi Vila-Guerau de Arellano, Scot T. Martin
Summary: The interaction between aerosols and the planetary boundary layer has a significant impact on urban air quality. This study focused on the complex feedback of aerosols on the Beijing megacity and found notable distinctions in aerosol properties and vertical distributions among different air masses. Aerosols consistently suppressed the daytime convective boundary layer, indicating the potential complexity of aerosol-PBL interactions in future scenarios and other urban regions.
ENVIRONMENTAL POLLUTION
(2023)
Article
Multidisciplinary Sciences
Georgy E. Manucharyan, Andrew F. Thompson
Summary: This study reveals a positive feedback between ocean-ice heat fluxes, sea ice cover, and upper-ocean vortices that is missing in coarse-resolution climate models. The results indicate that the loss of Arctic sea ice will lead to more energetic ocean vortices and increased ocean-ice heat exchange. This highlights the need for sea ice-aware parameterizations of eddy-induced ice-ocean heat fluxes in climate models.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Civil
Quentin Bucquet, Isabelle Calmet, Laurent Perret, Magdalena Mache
Summary: This work assesses the performance of the drag-porosity model implemented in ARPS atmospheric Large-Eddy Simulation (LES) solver for simulating the atmospheric boundary layer over the urban canopy. The flow over an idealized urban canopy consisting of cubes with various packing densities is investigated. The model is able to reproduce the key features of the flow over urban terrain, including turbulent coherent structures and their characteristic scales.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Environmental Sciences
Duanyang Liu, Wenlian Yan, Junlong Qian, Mei Liu, Zida Wang, Muning Cheng, Huaqing Peng
Summary: The study establishes a movable boundary layer conceptual model for the Jianghuai area in the winter half of the year based on the characteristics of atmospheric circulations and boundary layer dynamic conditions. Variations of cold and warm fronts in the area result in the formation of a movable boundary, affecting air quality and fog-haze episodes.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)