دویست سال بازسازی حلقه-درختی دمای حداکثر در کلیک نوشهر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکتری هواشناسی کشاورزی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، دانشکدة مهندسی و فناوری کشاورزی، گروه آبیاری و آبادانی، بخش هواشناسی کشاورزی

2 استادیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، دانشکدة مهندسی و فناوری کشاورزی، گروه آبیاری و آبادانی، بخش هواشناسی کشاورزی

3 دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، دانشکدة منابع طبیعی، گروه علوم و صنایع چوب و کاغذ

4 عضو هیئت علمی گروه جغرافیای دانشگاه ارلانگن- نورنبرگ

چکیده

یکی از روش‌های بازسازی متغیرهای اقلیمی، به‌ویژه دما، استفاده از گاه‌شناسی درختی (عرض حلقه‌های درختان) است. تاکنون تحقیقی در زمینة بازسازی درازمدت دما در اکوسیستم خزری انجام نشده است. تحقیق حاضر با استفاده از گاه‌شناسی درختان راش ارتفاعات نوشهر به بازسازی دما پرداخته است. برای این منظور، همبستگی حلقه‌های سالانة درختان با متغیرهای هواشناسی ایستگاهی و جهانی بررسی شد. تحلیل همبستگی نشان داد که کاهش دمای حداکثر در دورة رشد عامل محدودکنندة رشد درختان است. بنابراین، متوسط دمای حداکثر مارس- سپتامبر ایستگاه هواشناسی نوشهر بازسازی شد. نتایج بازسازی دما نشان داد که در دو قرن گذشته، در این منطقه سال‌های بسیار سرد بیش از سال‌های بسیار گرم بوده است. همچنین، دهة اول قرن بیستم و سال‌های 1950-1970 گرم‌ترین و دهة 1830 و سال‌های 1930-1950 سردترین دوره‌ها بوده‌اند. به‌علاوه، تأثیر معنادار فاز منفی NAO در ماه‌های ابتدایی رشد بر افزایش دما مشخص شد. دماهای بازسازی‌شده در این تحقیق مشابه تحقیقات انجام‌شده در شرق مدیترانه، روند جهانی افزایش دما در سال‌های اخیر را نشان نداد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Two Hundred Year Based Tree-ring Reconstruction of Maximum Temperature Koliak, Nowshahr

نویسندگان [English]

  • Mehdi Nadi 1
  • Javad Bazrafshan 2
  • Kambiz Pourtahmasi 3
  • Achim Bräuning 4
1 PhD Candidate, agro meteorology, University College of Agriculture & Natural Resources University of Tehran, Faculty of Agricultural Engineering & Technology, Department of Irrigation and reclamation, Agro meteorology Division
2 Assist. Professor, University College of Agriculture & Natural Resources university of Tehran, Faculty of Agricultural Engineering & Technology, Department of Irrigation and reclamation, Agro meteorology Division
3 Associate Professor, Wood & Paper Science & Technology Department, University College of Agriculture & Natural Resources, university of Tehran
4 Professor, Department of Geography, University of Erlangen-Nuremberg, Germany
چکیده [English]

One of the ways to reconstruction of climatic variables, especially temperature, is dendroclimatology or the use of tree-ring width chronology. There did not so far exist any tree-ring based reconstruction of long term temperature in Caspian Ecosystem. Throughout the present research, temperature was reconstructed using Fagus Orientalis tree-ring chronology samples collected from high elevated regions of Koliak (Nowshahr). To follow the target, a correlation between annual tree ring width and meteorological variables in local and as well in global scales was considered. Correlation analysis revealed that drop in maximum temperature is a limiting factor of tree growth, particularly in the period March-September. So, the average of March-September maximum temperature (based on data taken from Nowshahr’s station) was reconstructed. The results of temperature reconstruction showed that this region has experienced very cold years more than it has very warm ones within the past two centuries. Also the first decade of 20th century and years, 1950-1970 vs the decade of 1830th, and years 1930-1950 formed the warmest vs coldest periods, respectively. Besides, the significant effect of negative NAO on temperature rise in the early months of growth period was revealed. Reconstructed temperatures of this research as like the results obtained by other researchers in Eastern Mediterranean didn’t show any warming trend within recent years.

کلیدواژه‌ها [English]

  • Fagus orientalis
  • Reconstruction of temperature
  • Tree rings
  • NAO
  • Noshahr

مراجع

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