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On the Relation Between the Large-Scale Tropospheric Circulation and Air Quality in Tehran | ||
| فیزیک زمین و فضا | ||
| مقاله 7، دوره 43، شماره 4، دی 1396، صفحه 83-95 اصل مقاله (441.22 K) | ||
| شناسه دیجیتال (DOI): 10.22059/jesphys.2017.234371.1006901 | ||
| نویسندگان | ||
| Mojdeh Hafezi1؛ AliReza Mohebalhojeh* 2؛ Abbas Ali Aliakbari-Bidokhti3؛ Parviz Irannejad2؛ Samaneh Sabetghadam4 | ||
| 1Ph.D. Student, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran | ||
| 2Associate Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran | ||
| 3Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran | ||
| 4Assistant Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran | ||
| چکیده | ||
| The large-scale tropospheric circulation can play a controlling role in the accumulation and ventilation of air pollutants. It thus impacts air quality in large urban areas. This paper investigates the statistical relations between the dynamical indices related to circulation in the troposphere and visibility as a surrogate for air pollution in the urban area of Tehran for the climatological period of 1958 to 2013. The dynamical indices are based on jet splitting and Rossby wave breaking at the upper troposphere, eddy kinetic energy, meridional momentum flux, and static stability at the lower troposphere, as well as the high and low surface pressure disturbances. Despite the definite impact of surface pressure disturbances on visibility in Tehran, results show only very weak, if any, relation between the tropospheric circulation indices and visibility in Tehran. The absence of a robust relation is attributed to the slow response of the urban ventilation process to the time evolution of dynamical indices above the boundary layer and particularly at upper troposphere. The complex terrain of the region is likely the main factor creating the slow response. | ||
| کلیدواژه‌ها | ||
| TEHRAN؛ Air pollution episodes؛ Dynamical indices؛ Blocking؛ Split flow | ||
| عنوان مقاله [English] | ||
| On the Relation Between the Large-Scale Tropospheric Circulation and Air Quality in Tehran | ||
| نویسندگان [English] | ||
| Mojdeh Hafezi1؛ AliReza Mohebalhojeh2؛ Abbas Ali Aliakbari-Bidokhti3؛ Parviz Irannejad2؛ Samaneh Sabetghadam4 | ||
| 1Ph.D. Student, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran | ||
| 2Associate Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran | ||
| 3Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran | ||
| 4Assistant Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran | ||
| چکیده [English] | ||
| The large-scale tropospheric circulation can play a controlling role in the accumulation and ventilation of air pollutants. It thus impacts air quality in large urban areas. This paper investigates the statistical relations between the dynamical indices related to circulation in the troposphere and visibility as a surrogate for air pollution in the urban area of Tehran for the climatological period of 1958 to 2013. The dynamical indices are based on jet splitting and Rossby wave breaking at the upper troposphere, eddy kinetic energy, meridional momentum flux, and static stability at the lower troposphere, as well as the high and low surface pressure disturbances. Despite the definite impact of surface pressure disturbances on visibility in Tehran, results show only very weak, if any, relation between the tropospheric circulation indices and visibility in Tehran. The absence of a robust relation is attributed to the slow response of the urban ventilation process to the time evolution of dynamical indices above the boundary layer and particularly at upper troposphere. The complex terrain of the region is likely the main factor creating the slow response. | ||
| کلیدواژه‌ها [English] | ||
| TEHRAN, Air pollution episodes, Dynamical indices, Blocking, Split flow | ||
| مراجع | ||
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