Parameterization of vertical diffusion and the atmospheric boundary layer height determination in the EMEP model

Jeričević, Amela; Kraljević, Lukša; Grisogono, Branko; Fagerli, Hilde

doi:10.5194/acpd-9-9597-2009

Cited by 8 publications

(12 citation statements)

References 47 publications

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“…The OLD and Grisogono schemes (e.g. Grisogono and Oerlemans, 2002) are recently evaluated in the EMEP model (Jeričević et al, 2010). Empirical coefficients determined from LES data (DATABASE64; Esau and Zilitinkevich, 2006) in stable and neutral conditions are used in the Grisogono approach (Jericevic and Vecenaj, 2009).…”

Section: Description Of K(z) Parameterization Schemesmentioning

confidence: 99%

“…In this paper, we evaluate the performance of the higher-order closure K scheme based on total turbulent energy (TTE) closure (e.g., Mauritsen et. al, 2007) in addition to recently evaluated schemes, the O'Brien, Blackadar and Grisogono schemes in the EMEP model (Jeričević et al 2010). For the model evaluation available measurements 222 Rn from Europe are used.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the recently evaluated (Jeričević et al, 2010) operational EMEP vertical diffusion schemes K(z), the non-local O'Brien (1970) and local Blackadar (1979) schemes, as well as the nonlocal Grisogono scheme (e.g. Grisogono and Oerlemans, 2002), a new scheme which is local in stable boundary layer (SBL) and non-local in convective boundary layer (CBL) and based on total turbulent energy (TTE) closure (e.g., Mauritsen et.…”

Section: Introductionmentioning

confidence: 99%

“…from 38 th hour of the model run, the atmosphere was synoptically unstable due to cold front passage over the analyzed area. (Jeričević et al, 2010), a new scheme which is based on total turbulent energy (TTE) closure (Mauritsen et al, 2007) is implemented in the EMEP model and analyzed. Intercomparison of different local and non-local schemes on the 222 Rn data showed that the non-local scheme Grisogono is less diffusive in CBL conditions than the O'Brien and TTE scheme.…”

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confidence: 99%

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Exploring the properties of local and non-local vertical diffusion schemes in the EMEP model using <SUP align="right">222</SUP>Rn data

Jeričević¹,

Fagerli²,

Grisogono³

2012

IJEP

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Abstract:The simulations of hourly Radon 222 ( 222 Rn) concentrations are performed with the Unified EMEP model (Simpson et al., 2003) in order to validate different parameterization schemes for vertical mixing. In addition to the recently evaluated (Jeričević et al., 2010) operational EMEP vertical diffusion schemes K(z), the non-local O'Brien (1970) and local Blackadar (1979) schemes, as well as the nonlocal Grisogono scheme (e.g. Grisogono and Oerlemans, 2002), a new scheme which is local in stable boundary layer (SBL) and non-local in convective boundary layer (CBL) and based on total turbulent energy (TTE) closure (e.g., Mauritsen et. al, 2007) INTRODUCTIONThe atmospheric boundary layer turbulence is the most important mechanism for the distribution of tracers. The parameterization of turbulent diffusion K(z) is an inevitable, traditional approach in description of turbulent processes and the estimation of turbulence effects in air quality models. Previous studies have already shown that the parameterizations of K(z) have significant impacts on simulated chemical concentrations (e.g. Oliviè et al., 2004). Various parameterizations, mainly first-order, non-local eddy diffusivity K schemes are proposed and widely used in practical applications (e.g. O'Brien, 1970;Holtslag and Moeng, 1991;Grisogono, 1995). A several modifications of the first-order schemes are proposed to overcome deficiencies to accurately simulate dispersion in different atmospheric stability conditions (e.g. Grisogono and Oerlemans, 2002;Mihailovic and Alapaty, 2007). In this paper, we evaluate the performance of the higher-order closure K scheme based on total turbulent energy (TTE) closure (e.g., Mauritsen et. al, 2007) in addition to recently evaluated schemes, the O'Brien, Blackadar and Grisogono schemes in the EMEP model (Jeričević et al. 2010). For the model evaluation available measurements 222 Rn from Europe are used. Radon is a radioactive gas which is found naturally in trace amounts in most rocks and soils. Since radionuclide 222 Rn has a half-life of 3.8 days and it is emitted primarily from the continents at a fairly constant emission rate between 0.8 and 1.3 atom cm -2 s -1 (Dentener et al., 1999) it is ideal to study the model sub-grid mixing schemes, numerical advection schemes or to compare different models. A considerable number of global and regional studies have been devoted to the simulation of

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Section: Description Of K(z) Parameterization Schemesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Exploring the properties of local and non-local vertical diffusion schemes in the EMEP model using <SUP align="right">222</SUP>Rn data

Jeričević¹,

Fagerli²,

Grisogono³

2012

IJEP

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“…These studies focus on the further development of the European mesoscale Eulerian chemical transport modelling system (EMEP) (Simpson et al, 2003) and its adaptation to domains over Croatia (Jeričević et al, 2007(Jeričević et al, , 2010. Additionally, some effort was also put into development of the atmospheric Lagrangian particle stochastic model (Kos et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Using a generalized additive model to quantify the influence of local meteorology on air quality in Zagreb

2015

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This paper reports the estimated response of hourly mean concentrations of selected air pollutants, namely carbon monoxide (CO), sulphur dioxide (SO 2 ), nitrogen dioxide (NO 2 ) and particulate matter with an aerodynamic diameter of up to 10 µm (PM 10 ), to local scale meteorology in Zagreb, Croatia for the period 2006-2012. A new method is applied here for the urban area of Zagreb. In a general model, a logarithm of hourly mean air pollutant concentrations is expressed as the sum of the nonlinear functions of meteorological and several time variables, with the latter included accounting for temporal variation in emissions. The model can be formulated within the framework of generalized additive models (GAMs) and is additive on the logarithmic scale, which results in multiplicative effects on the original scale. Although the model is nonlinear, it is simple and easy to interpret. It quantifies the impact of meteorological conditions and emissions on air pollution. A measure of the relative importance of each predictor, partial effects and statistical evaluation of the model are also presented. Overall, the results show that the most important predictors are those related to emissions. The aggregate impact of meteorological variables in the model explained 45% of variance in CO, 14% in SO 2 , 25% in NO 2 and 24% in PM 10 . This indicates that meteorology, at least on a local scale, is a noticeable driver of air quality in Zagreb. Stable atmospheric conditions in the urban area favour the occurrence of higher concentrations of air pollutants. Convection processes dominate under unstable conditions, resulting in the dilution of pollutant concentrations within the boundary layer.

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Atmospheric dynamics and elevated ozone concentrations in the northern Adriatic

Prtenjak

Jeričević

Klaić

et al. 2012

Meteorological Applications

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The influence of mesoscale flow on the elevated O3 concentrations recorded during 13–19 August 2000 in the coastal town of Rijeka (45.33°N, 14.45°E) has been examined. Although high levels of ozone concentration are often observed there, this episode was unique due to hourly afternoon concentrations persistently higher than 180 µg m−3 and nocturnal levels above 100 µg m−3. To study this episode, available meteorological and ozone measurements were analysed, along with supplemental numerical simulations and trajectories. The measurements revealed favourable atmospheric conditions for the production of ozone, i.e., high air temperatures associated with (1) the exchange of two dominant (although relatively weak) large‐scale flows: southwesterly versus northeasterly bora winds, and (2) local thermal circulation. The bora wind was relatively weak and short lasting. Although the bora transported the polluted air mass away along the western Adriatic coast, the southwesterly flow returned ozone‐rich air toward the Alps, thus contributing to the overall pollution over the northern Adriatic Sea. Models revealed the superposition of the southwesterly wind and local, thermally induced winds that caused the regional transport of ozone toward the Alps and the eastern Adriatic coast. However, while the regional transport of ozone from the northern Adriatic was found to enhance somewhat the ozone concentrations in Rijeka at the end of period studied, its surrounding local emission sources, uniform local thermal circulation systems, and recirculation of pollutants were crucial factors in the formation of the large daytime and night time ozone levels observed in Rijeka.

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Parameterization of vertical diffusion and the atmospheric boundary layer height determination in the EMEP model

Cited by 8 publications

References 47 publications

Exploring the properties of local and non-local vertical diffusion schemes in the EMEP model using <SUP align="right">222</SUP>Rn data

Exploring the properties of local and non-local vertical diffusion schemes in the EMEP model using <SUP align="right">222</SUP>Rn data

Using a generalized additive model to quantify the influence of local meteorology on air quality in Zagreb

Atmospheric dynamics and elevated ozone concentrations in the northern Adriatic

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