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## Publications

Publications (75)

The problem of realizability of the second-order turbulence closure models (parametrization schemes) is addressed through the consideration of the so-called “stability functions”. The emphasis is on the turbulence kinetic energy–scalar variance (TKESV) closure scheme that carries prognostic transport equations for the turbulence kinetic energy (TKE...

The problem of boundary conditions for the variances and covariances of scalar quantities (e.g., temperature and humidity) at the underlying surface is considered. If the surface is treated as horizontally homogeneous, Monin–Obukhov similarity suggests the Neumann boundary conditions that set the surface fluxes of scalar variances and covariances t...

The nighttime high-latitude stably stratified atmospheric boundary layer (SBL) is computationally simulated using high–Reynolds number large-eddy simulation on meshes varying from 2003 to 10243 over 9 physical hours for surface cooling rates Cr = [0.25, 1] K h−1. Continuous weakly stratified turbulence is maintained for this range of cooling, and t...

A detailed analysis of the pressure-scrambling terms (i.e., the pressure-strain and pressure gradient-scalar covariances) in the Reynolds-stress and scalar-flux budgets for cloud-topped boundary layers (CTBLs) is performed using high-resolution large-eddy simulation (LES). Two CTBLs are simulated — one with trade wind shallow cumuli, and the other...

A detailed analysis of the pressure-scrambling terms (i.e., the pressure-strain and pressure gradient-scalar covariances) in the Reynolds-stress and scalar-flux budgets for cloud-topped boundary layers (CTBLs) is performed using high-resolution large-eddy simulation (LES). Two CTBLs are simulated - one with trade wind shallow cumuli, and the other...

The effect of horizontal temperature heterogeneity of the underlying surface on the turbulence structure and mixing intensity in the stably stratified boundary layer (SBL) is analyzed using large-eddy simulation (LES). Idealized LESs of flows driven by fixed winds and homogeneous and heterogeneous surface temperatures are compared. The LES data are...

In order to address urban climate at the regional scales, a new efficient urban land-surface parametrization TERRA_URB has been developed and coupled to the atmospheric numerical model COSMO-CLM. Hereby, several new advancements for urban land-surface models are introduced which are crucial for capturing the urban surface-energy balance and its sea...

A detailed analysis of second-order moment budgets for cloud-topped boundary layers (CTBLs) is performed using high-resolution large-eddy simulation (LES). Two CTBLs are simulated – one with trade-wind shallow cumuli, and the other with nocturnal marine stratocumuli. Approximations to the ensemble-mean budgets of the Reynolds-stress components, of...

The research network “Basic Concepts for Convection Parameterization in
Weather Forecast and Climate Models” was organized with European funding (COST
Action ES0905) for the period of 2010–2014. Its extensive brainstorming suggests how the
subgrid-scale parameterization problem in atmospheric modeling, especially for convection, can be examined and...

The African great lakes are of utmost importance for the local economy (fishing), as well as being essential to the survival of the local people. During the past decades, these lakes experienced fast changes in ecosystem structure and functioning, and their future evolution is a major concern. In this study, for the first time a set of one-dimensio...

Results of a lake model intercomparison study conducted within the framework of Lake Model Intercomparison Project are presented. The investigated lake was Großer Kossenblatter See (Germany) as a representative of shallow, (2 m mean depth) turbid midlatitude lakes. Meteorological measurements, including turbulent fluxes and water temperature, were...

We report on the development and testing of a turbulence kinetic energy – scalar variance (TKESV) mixing scheme, and its implementation into the COSMO model. A summary of results obtained within the framework of the COSMO Priority Project UTCS is given, including a brief outline of the TKESV scheme, a discussion of the scheme performance in various...

The African great lakes are of utmost importance for the local economy (ﬁshing), as well as being essential to the survival of the local people. During the last decades, these lakes experienced fast changes in ecosystem structure and functioning and their future evolution is a major concern. In this study, for the ﬁrst time a set of one-dimensional...

Entrainment and detrainment processes has been recognised for a long time as key processes for cumulus convection and
has witnessed recently renaissance mainly due to the capability of Large Eddy Simulations (LES) to diagnose these processes in more detail.
This paper has a twofold purpose. Firstly it provides a historical overview of the past res...

Please read/download the final version in GMD, 2013, DOI:10.5194/gmd-6-1337-2013
Results of a lake model intercomparison study conducted within the framework of Lake Model Intercomparison Project are presented. The investigated lake was Großer Kossenblatter See (Germany) as a representative of shallow (2 m mean depth) midlatitude turbid lakes. Met...

A bulk thermodynamic (no rheology) sea-ice parameterisation scheme for use in numerical weather prediction (NWP) is presented. The scheme is based on a self-similar parametric representation (assumed shape) of the evolving temperature profile within the ice and on the integral heat budget of the ice slab. The scheme carries ordinary differential eq...

Lakes can influence regional climate, yet most general circulation
models have, at best, simple and largely untested representations of
lakes. We developed the Lake, Ice, Snow, and Sediment Simulator (LISSS)
for inclusion in the land-surface component (CLM4) of an earth system
model (CESM1). The existing CLM4 lake model performed poorly at all
site...

A model evaluation approach is proposed in which weather and climate prediction models are analyzed along a Pacific Ocean cross section, from the stratocumulus regions off the coast of California, across the shallow convection dominated trade winds, to the deep convection regions of the ITCZ-the Global Energy and Water Cycle Experiment Cloud System...

An online lake-modeling tool FLake-Global allows virtually instantaneous estimation of the seasonal cycle of temperature and mixing conditions in any shallow freshwater lake around the world. The tool is built on the basis of the lake model FLake (www.lakemodel.net) and a year- long near-surface meteorological data from the NCEP/NCAR Reanalysis Pro...

Two alternative depth scales have been proposed for the case of a stably stratified boundary layer (SBL) where static stability is due to the surface buoyancy flux Bs. Kitaigorodskii in 1960 assumed that the Earth's rotation is no longer important as static stability becomes strong and that the SBL depth scales with the Obukhov length , u* being th...

The lake model FLake was incorporated into the European Centre for Medium-Range Weather Forecasts (ECMWF) land-surface scheme HTESSEL. Results from global offline simulations are presented in order to evaluate the model performance in different climates and assess the impact of lake representation on the surface energy balance. The model was forced...

Modelling lakes in Numerical Weather Prediction (NWP) is important to produce accurate evaporation rates and surface temperature forecasts. Lake depth is a crucial external parame- ter for the implementation of lake models into NWP systems, since it controls the dynamical range of lake temperature amplitudes on diurnal to seasonal time scales. Howe...

The state-of-the-art in one-dimensional lake modelling is briefly reviewed and the motivation for a Lake Model Intercomparison Project (LakeMIP) is presented. The objectives, methodology and implementation phases of the LakeMIP are outlined. Some results from the first intercomparison study are presented. The lake models used in the study range fro...

This paper describes the objectives and shows some preliminary results obtained throughout the first phase of the Lake Model Intercomparison Project, termed LakeMIP. Parallel to this poster, an oral presentation will focus in turn on other features of the project. This international effort started off after the workshop “Parameterization of Lakes i...

The Lake Model Intercomparison Project (LakeMIP) is an international project initiated by participants of the
workshop “Parameterization of Lakes in Numerical Weather Prediction and ClimateModelling” held in September 2008 in St. Petersburg (Zelenogorsk), Russia. LakeMIP offers an opportunity for a comprehensive evaluation and validation of many la...

The impact of lakes on the European climate is considered by analysing two 30-year regional climate model (RCM) simulations. The RCM applied is the Rossby Centre regional climate model RCA3.5. A simulation where all lakes in the model domain are replaced by land surface is compared with a simulation where the effect of lakes is accounted for throug...

Quantitative precipitation forecasting (QPF) is an important reason to run a numerical weather prediction model - for forecasters and customers. Unfortunately, precipitation is also a very difficult parameter to quantitatively forecast. There are indications from verification and from forecasters in various COSMO countries, that the COSMO model - l...

Lakes and other inland water bodies can, in certain areas, compose a
large fraction of the land surface. Inland waters have an important role
in determining local and regional climates, primarily because of large
differences in albedo, heat capacity, roughness, and energy exchange
compared to vegetated land surfaces. Despite the radically different...

Editor in charge of this article: Veli-Matti Kerminen) mironov, D., heise, e., Kourzeneva, e., ritter, B., schneider, n. & terzhevik, a. 2010: implementation of the lake parameterisation scheme Flake into the numerical weather prediction model cosmo. Boreal Env. Res. 15: 218–230. The application of the lake model FLake to represent the effect of la...

Turbulence is ubiquitous in the earth’s atmosphere. Its spatial scales range from many tens of kilometres to a few millimetres. A wide assortment of turbulent eddies of different size and shape lies within this range. These include breeze circulations, storms, clouds, plumes and rolls in the planetary boundary layer (PBL), and eddies in urban stree...

Micrometeorological measurements (including eddy-covariance measurements of the surface fluxes of sensible and latent heat) were performed during the LITFASS-2003 experiment at 13 field sites over different types of land use (forest, lake, grassland, various agricultural crops) in a 20×20 km2 area around the Meteorological Observatory Lindenberg (M...

SUMMARY The present study aims at estimating seasonal changes of temperature in idealised lakes (lagoons) of the Iberian Peninsular and of the evaporation from the lake surface. The sensitivity of the annual temperature cycle and of the evaporation to climatological changes is examined. To this end, two one-dimensional fresh-water lake models are a...

In this note, a brief summary of some recent findings is presented. A bulk mixed-layer scaling suitable for radiatively-driven convection, the flow structures present in the convective boundary layer (CBL), some turbulence statistics, and a bulk model of radiatively-driven CBL are briefly discussed.

Convection in an ice-covered lake, driven by the absorption of solar radiation, is investigated by means of temperature microstructure technique. This type of convection typically occurs in spring, when melting snow on the ice cover enables solar radiation to penetrate into the water body. The diurnal dynamics of the stratification system of five d...

Penetrative convection is discussed where the instability is driven by radiative heating of water below the temperature of maximum density. Convection of this type occurs in ice-covered freshwater lakes in late spring, when the snow cover vanishes and solar radiation is absorbed beneath the ice cover. The vertical temperature structure, bulk mixed...

The pressure-potential-temperature covariance in free and rotating turbulent convection with no mean velocity shear is analysed, using a dataset generated with a large-eddy simulation (LES) model. The pressure field is resolved into turbulence-turbulence, buoyancy and Coriolis components, and the contributions from these components to the pressure-...

The model utilises a four-layer self-similar parameterisations of the evolving profiles of tem- perature, θ, and salinity, S. The structure of the entrainment layer is parameterised with a zero-order-jump approach. A stationary solution to the heat transfer equation is applied to describe the temperature profile in the stably stratified layer separ...

Effects of topography on micrometeorological fields may have a great impact on noise propagation. Consequently, we discuss some preliminary results from a modelling study of short-term evolution of wind and temperature over a smooth, non-flat terrain. The study is performed using the 3-D model SUBMESO. A new meteorological pre-processor (MPP) has b...

The pressure-potential-temperature covariance in free and rotating turbulent convection with no mean velocity shear is analysed, using a dataset generated with a large-eddy simulation (LES) model. The pressure field is resolved into turbulence-turbulence, buoyancy and Coriolis components, and the contributions from these components to the pressure-...

Introduction The pressure#potential-temperature covariance in free and rotating turbulent convection with no mean velocity shear is analysed, using a data set generated through large-eddy simulation #LES#. Rotating convection is encountered in many geophysical and astrophysical #uid systems and in some technical applications. A prominent geophysica...

The regime of penetrative convection driven by a vertically inhomogeneous radiation heating is considered. Similar convection is observed in ice-covered freshwater lakes, where the water temperature is below the maximum-density temperature during late spring. The convective length, velocity, and temperature scales are introduced, which are suitable...

The structure of the instantaneous flow fields and turbulence statistics and the second-order moment budgets in convection affected by rotation are analysed using a large-eddy simulation (LES) dataset. Three archetypes of convective flows driven by the surface buoyancy flux are generated. One is the reference case of the non-rotating convective bou...

The turbulence closure problem for convective boundary layers is
considered with the chief aim to advance the understanding and modeling
of nonlocal transport due to large-scale semiorganized structures. The
key role here is played by third-order moments (fluxes of fluxes). The
problem is treated by the example of the vertical turbulent flux of
pot...

A similarity-theory model for the vertical profile of wind velocity components and for the shearing stress at the surface in stably stratified barotropic planetary boundary layers (SBLs) is derived with due regard for the imposed static stability at the outer edge of the SBL and inertial oscillations within the SBL. It is the neglection of the abov...

Currently no expression for the equilibrium depth of the turbulent stably-stratified boundary layer is available that accounts
for the combined effects of rotation, surface buoyancy flux and static stability in the free flow. Various expressions proposed
to date are reviewed in the light of what is meant by the stable boundary layer. Two major defi...

The paper extends Deardorff's general structure parameterization for a shear-free convective boundary layer. The model suggested employs the mixed layer hypothesis that the buoyancy (which is defined as b = g(rho(sub 0) - rho/rho(sub 0) where rho is the density, rho(sub 0) is the reference density, and g is the acceleration due to gravity) is const...

The analysis concentrates mainly on the temperature structure in the convectively mixed region and the dynamics of a special thermo-hydrodynamic phenomenon called "thermal bar" (a zone of descending water with the temperature of maximum density equal to ~4°C). The temperature offshore the 4°C isotherm in the convectively mixed region of the lake is...

The thermal bar in Lake Ladoga was studied during one week in May 1991. Temperature and current velocity distributions were measured. The movement of the thermal bar and the horizontal heat transport were examined.
The temperature off-shore the thermal bar was found to be constant within a vertical. The velocity distributions were complex and depen...

Vertical temperature profile in a thermocline, proves to be self-similar in a series of laboratory experiments and in natural water reservoirs: Comparison of the experimental data on kinematic heat flux Q and vertical temperature gradient ∂T/∂z shows that the effective heat conductivity K≡-Q/(∂T/∂z) is much higher than the molecular one, and, rathe...

A lake model intended for use as a lake parameterization module in numerical weather prediction (also in climate modelling and other environmental applications) is developed. The model is capable of predicting the vertical temperature structure and mixing condi- tions in lakes of various depth on the time scales from a few hours to many years. It i...

The application of the lake model FLake (http://lakemodel.net) to represent the effect of lakes in numerical weather prediction (NWP) and climate models is discussed. As a lake parameterization scheme, FLake is implemented into the limited-area NWP model COSMO and into the regional climate models CLM and RCA. It is on the way into the NWP model HIR...

Excellent discussions of convection and turbulence parameterisation issues took place during the workshop. Among other things, an attempt was made to identify (i) at which resolution (horizontal grid size) of a numerical model of atmospheric circulation (NWP model, climate model) can convection parameterisation (scheme) be switched off entirely, (i...

In this note, recent results concerning the parameterization of convection in the global numer- ical weather prediction (NWP) system GME (Majewski et al. 2002) of the German Weather Service (DWD) are brie∞y described. GME utilises the well-known Tiedtke (1989) mass-∞ux convection parameterization scheme that contains only minor modiflcations as com...

The vertical temperature structure of bottom sediments in lakes is discussed. Observations indicate that the temperature profile in the bottom sediments has the form of a thermal wave. The wave starts at the water-sediment interface and propagates downward as the lake water and the bottom sediments are heated during spring and summer. When heating...

A lake model intended for use as a lake parameterization scheme in numerical weather predic- tion (NWP), climate modelling and other environmental applications is presented. The model, termed FLake (Mironov 2008, http://lakemodel.net), is capable of predicting the vertical tem- perature structure and mixing conditions in lakes of various depth on t...

German Weather Service, OOenbach am Main, Germany y A new ice model (Mironov and Ritter 2003) for the global NWP system GME (Majewski et al. 2002) of the German Weather Service has been tested through parallel experiments including data assimilation. The main features of the new GME ice model are brieey outlined as follows. The model accounts for t...

1 German Weather Service, OOenbach am Main, Germany y 2 Northern Water Problems Institute, Russian Academy of Sciences, Petrozavodsk, Russia A l a k e model intended for use in NWP systems (also in climate modelling and other numerical prediction systems for environmental applications) is developed (Mironov 2003). The model is capable of predicting...

The vertical temperature structure of bottom sediments in lakes is discussed. Observations indicate that the temperature profile in the bottom sediments has the form of a thermal wave. The wave starts at the water-sediment interface and propagates downward as the lake water and the bottom sediments are heated during spring and summer. When heating...

A bulk thermodynamic ice model for use in numerical weather prediction (NWP) is devel-oped. The model is based on a self-similar parametric representation (assumed shape) of the evolving temperature proole within the ice and on the integral heat budget of the ice slab. The model solves two ordinary diierential equations for the two time-dependent q...

A recently developed lake model (Mironov et al. 2003, 2004) for use in NWP, climate modelling and other numerical prediction systems for environmental applications is implemented into the limited-area NWP system LM (Steppeler et al. 2003) of the German Weather Service (DWD) and first test runs are performed. The lake model, termed FLake, is a bulk...

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