Results 51 to 60 of about 1,778 (188)

EnKF and expectation‐maximization based parameter estimation of a convective gravity‐wave parameterization using Strateole 2 constant‐level balloon data

Quarterly Journal of the Royal Meteorological Society, EarlyView.
An offline methodology is applied to estimate parameters of a convective gravity‐wave scheme using momentum flux (MF) observations from constant‐level balloons (left panels: pdfs of east and west MFs in green from observations and black from EnKF). The approach integrates an ensemble Kalman filter with an expectation‐maximization algorithm and permits ...
F. Lott, P. Tandeo, M. Pulido, D. Bardet
wiley   +1 more source

Sensitivity of a Mediterranean Tropical-Like Cyclone to Physical Parameterizations

Atmosphere, 2018
The accurate prediction of Mediterranean tropical-like cyclones, or medicanes, is an important challenge for numerical weather prediction models due to their significant adverse impact on the environment, life, and property.
Ioannis Pytharoulis, Stergios Kartsios, Ioannis Tegoulias, Haralambos Feidas, Mario Marcello Miglietta, Ioannis Matsangouras, Theodore Karacostas   +6 more
doaj   +1 more source

Modeling rainfall drop size distribution moments using an S‐band polarimetric radar in complex terrain

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Using S‐band dual‐polarization radar and disdrometers during PRECIP 2022 in Taiwan, we analyze a Mei‐Yu frontal event with widespread stratiform rain and embedded convection. Multiple disdrometers are used to create a novel drop size distribution model for S‐band radars resolving both the drizzle and precipitation modes. The model reveals both inferred
Ian C. Cornejo, Angela K. Rowe, Michael M. Bell, Wei‐Yu Chang   +3 more
wiley   +1 more source

Reduction of Pacific Double‐ITCZ Bias by Convection Parameterization in NCAR CESM2.2

Journal of Advances in Modeling Earth Systems
The impact of convective closure on the double‐ITCZ bias in the NCAR CESM2.2 is investigated in this study. The standard CESM2.2 simulates a remarkable double‐ITCZ bias in the central and eastern Pacific, especially in boreal winter and spring ...
Xiaoliang Song, Guang J. Zhang
doaj   +1 more source

Regional modelling of tracer transport by tropical convection – Part 1: Sensitivity to convection parameterization [PDF]

Atmospheric Chemistry and Physics, 2009
The general objective of this series of papers is to evaluate long duration limited area simulations with idealised tracers as a tool to assess tracer transport in chemistry-transport models (CTMs).
J. Arteta, V. Marécal, E. D. Rivière
doaj  

Application of the concept of blending height to the calculation of surface fluxes in a mesoscale model

Meteorologische Zeitschrift, 1996
The concept of blending height is implemented into the nonhydrostatic mesoscale transport and flow model METRAS for the calculation of grid averaged subgrid scale surface fluxes of momentum, heat and moisture over flat terrain with different land-use ...
K. von Salzen, M. M. Claussen, K. H. Schlünzen   +2 more
doaj   +1 more source

Machine Learning‐Driven Capillary Microfluidic Design Automation for Programmable Gradient Generation and Antimicrobial Testing

Small, EarlyView.
TCG‐CMDA, a machine learning‐guided capillary microfluidic design automation platform, enables automated design of tree‐shaped concentration gradient generators for programmable mixing of two agents. The pump‐free chip supports synchronized passive flow and programmable gradient formation, providing a practical framework for decentralized point‐of‐care
Mahmood Khalghollah, Azam Zare, Sorosh Abdollahi, Behrouz H. Far, Amir Sanati Nezhad   +4 more
wiley   +1 more source

Using Thermodynamics and Microstructure to Mitigate Overfitting in Pellet Reduction Models

steel research international, EarlyView.
A in time and space discretized, thermodynamically sound model for direct reduction of iron oxide pellets is described. The number of fitting parameters is drastically reduced compared to existing models. Nevertheless, fitting kinetic parameters based on conversion degree data alone leads to overfitting, which can be mitigated by correlating the ...
Ömer K. Büyükuslu, Fabrice Yang, Dierk Raabe, Moritz to Baben, Anna L. Ravensburg   +4 more
wiley   +1 more source

A Parameterization for Cloud Organization and Propagation by Evaporation‐Driven Cold Pool Edges

Journal of Advances in Modeling Earth Systems
When the negatively buoyant air in the cloud downdrafts reaches the surface, it spreads out horizontally, producing cold pools. A cold pool can trigger new convective cells. However, when combined with the ambient vertical wind shear, it can also connect
Saulo R. Freitas, Georg A. Grell, Angel D. Chovert, Maria Assunção F. Silva Dias, Ernani deLima Nascimento   +4 more
doaj   +1 more source

Development and Validation of a Next‐Generation Mechanistic Model of the Electric Arc Furnace

steel research international, EarlyView.
This study presents a next‐generation mechanistic model of the electric arc furnace (EAF). It describes equations for all crucial processes appearing during the steel‐recycling process in an EAF, i.e., thermal, mass, and chemical. The model was parameterized and validated using industrial EAF data.
Vito Logar, Igor Škrjanc
wiley   +1 more source