Mesoscale modeling of meteorological conditions in the lower troposphere during a winter stratospheric ozone intrusion over Zagreb, Croatia

Klaić, Zvjezdana Bencetić; Belušić, Danijel; Bulić, Ivana Herceg; Hrust, Lovro

doi:10.1029/2003jd003878

Cited by 11 publications

(6 citation statements)

References 39 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…European urban monitoring networks and experimental campaigns have revealed that on the large scale, polluted air masses that were enriched by ozone over the Mediterranean were mostly advected in central Europe (Millan et al , ; Lindskog et al , ) by long‐range transport (Carvalho et al , ). Large‐scale meteorological processes can also create conditions favourable to the stratospheric intrusion of ozone (e.g., Klaić et al , ) that can result in a local increase in tropospheric ozone concentrations. While daytime ozone production is dominated by photochemical reactions, an increase in night time ozone levels is solely the result of specific wind circulation systems on local and regional scales (Strassburger and Kuttler, ).…”

Section: Introductionmentioning

confidence: 99%

Atmospheric dynamics and elevated ozone concentrations in the northern Adriatic

Prtenjak

Jeričević

Klaić

et al. 2012

Meteorological Applications

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Atmospheric dynamics and elevated ozone concentrations in the northern Adriatic

Prtenjak

Jeričević

Klaić

et al. 2012

Meteorological Applications

Self Cite

View full text Add to dashboard Cite

show abstract

“…A three‐dimensional non‐linear non‐hydrostatic prognostic mesoscale model for unsaturated air (MEMO, version 6.0) is employed. A detailed model description and its performance have been documented in previous publications (Moussiopoulos, 1995; Caballero and Lavagnini, 2002; Klaić and Nitis, 2002; Klaić et al, 2002, 2003a) and here we provide only a brief overview. The model vertical coordinate is terrain following.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Estimation of bora wind gusts using a limited area model

Belušić¹,

Klaić²

2004

Tellus A

View full text Add to dashboard Cite

A performance of the wind gust estimate (WGE) method on the bora wind has been examined. Numerical simulations of several bora episodes have been performed using a non‐hydrostatic mesoscale model MEMO6. The model captured well the onset and cessation of the bora while the agreement between simulated and observed wind speeds differed from episode to episode. In cases with accurately simulated wind speeds, the WGE results were very good, thus indicating that the method could be used in forecasting bora gusts. The performance of the WGE method for the examined bora cases also suggested a possibility of further simplification of the method for the bora applications. Inspection of the bora flow and its thermodynamical structure revealed that after the bora onset the shear instabilities completely overwhelm the buoyant forces. This means that the parcels with the maximum wind speed in the boundary layer will always be able to reach the surface and result in wind gusts. Therefore, it is enough to have only a vertical profile of the wind speed. Although completely derived from the physical considerations, this represents a very simple way of determining bora wind gusts and can thus be easily implemented in the operational bora wind forecasting models.

show abstract

“…A three-dimensional non-linear non-hydrostatic prognostic mesoscale model for unsaturated air (MEMO, version 6.0) is employed. A detailed model description and its performance have been documented in previous publications (Moussiopoulos, 1995;Caballero and Lavagnini, 2002;Klaić and Nitis, 2002;Klaić et al, 2002Klaić et al, , 2003a) and here we provide only a brief overview. The model vertical coordinate is terrain following.…”

Section: Numerical Modelmentioning

confidence: 99%

Estimation of bora wind gusts using a limited area model

Belušić

Klaić

2004

Tellus A: Dynamic Meteorology and Oceanography

Self Cite

View full text Add to dashboard Cite

A performance of the wind gust estimate (WGE) method on the bora wind has been examined. Numerical simulations of several bora episodes have been performed using a non-hydrostatic mesoscale model MEMO6. The model captured well the onset and cessation of the bora while the agreement between simulated and observed wind speeds differed from episode to episode. In cases with accurately simulated wind speeds, the WGE results were very good, thus indicating that the method could be used in forecasting bora gusts. The performance of the WGE method for the examined bora cases also suggested a possibility of further simplification of the method for the bora applications. Inspection of the bora flow and its thermodynamical structure revealed that after the bora onset the shear instabilities completely overwhelm the buoyant forces. This means that the parcels with the maximum wind speed in the boundary layer will always be able to reach the surface and result in wind gusts. Therefore, it is enough to have only a vertical profile of the wind speed. Although completely derived from the physical considerations, this represents a very simple way of determining bora wind gusts and can thus be easily implemented in the operational bora wind forecasting models.

show abstract

Mesoscale modeling of meteorological conditions in the lower troposphere during a winter stratospheric ozone intrusion over Zagreb, Croatia

Cited by 11 publications

References 39 publications

Atmospheric dynamics and elevated ozone concentrations in the northern Adriatic

Atmospheric dynamics and elevated ozone concentrations in the northern Adriatic

Estimation of bora wind gusts using a limited area model

Estimation of bora wind gusts using a limited area model

Contact Info

Product

Resources

About