بررسی روند تغییرات شبانه روزی ازن تروپوسفری در اصفهان

نوع مقاله: مقاله پژوهشی

نویسنده

عضو هیأت علمی دانشگاه پیام نور

چکیده

جهت بررسی وجود روند تغییرات شبانهروزی اُزون تروپروسفری در اصفهان از روشهای آماری تحلیل خوشهای و مقایسه خط روند استفاده شده است. در ابتدا الگوهای مشابه تغییرات روند را در کل دوره آماری با بهرهگیری از تحلیل خوشهای گروهبندی کردیم. بر این اساس تغییرات شبانه روزی اُزون به چهار گروه روند (حداکثر روزانه، حداقل شبانه، روند افزایش روزانه و روند کاهش شبانه) تقسیم شد. اعتبار گروهبندیهای بدست آمده با استفاده از روش آماری تحلیل واریانس یکطرفه آزمون شد. به این ترتیب اختصاص 646 روز (3/88 درصد) به گروه بندی مزبور در سطح اطمینان بالای 95 درصد تأیید شد. در ایستگاه لاله 6/94 درصد از روزهای سال از الگوی افزایش روزانه و کاهش شبانه پیروی میکردند. همچنین بررسی خط روند مقادیر میانگین و حَدی فصلی و سالانه اُزون نشان داد، اُزون دارای روند تغییرات شبانه روزی منظم است که این روند در ایستگاه لاله دارای نظم بهتری است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation on the trend of circadian changes in tropospheric ozone in Isfahan

نویسنده [English]

  • Abbasali Arvin
Payam-e Noor University
چکیده [English]

Cluster analysis and trend line comparison were used to investigate the trend of circadian changes in tropospheric ozone in Isfahan. First, we categorized similar changing patterns in the statistical period using cluster analysis. In this regard, circadian changes of ozone were divided into four groups (daily maximum, night minimum, daily increase trend, night decrease trend). Validity of these categories was tested using ANOVA. In this way, assigning 646 days (88.3 percent) to the aforementioned category was confirmed in 95 percent confidence level. In Lale station, 94.6 percent of days in each year followed daily increase and night decrease trends. Moreover, investigating mean trend lines and seasonal and annual limits shows that ozone possesses a regular trend in circadian changes. This regularity is more apparent in Lale station.

کلیدواژه‌ها [English]

  • Ozone
  • Isfahan
  • hierarchical cluster analysis
  • ANOVA

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