تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

باز سازی اقلیمی حوضه دشت ارژن فارس با استفاده از مطالعات رسوبشناختی

نویسندگان
زهرا سادات حسینی 1
شهریار خالدی 1
عبدالمجید نادری بنی 2
1 دانشگاه شهید بهشتی
2 پژوهشگاه علوم جوی و اقیانوس شناسی
10.29252/jgs.18.49.187
چکیده
بازسازی آب و هوای دیرینه با استفاده از روش‌های مطالعاتی گوناگون به عنوان یکی از شاخه‌های علم اقلیم‌شناسی دارای اهمیت فراوانی است بدین منظور مغزه‌ای به طول 960 سانتیمتر از تالاب دشت ارژن توسط پژوهشگاه ملی اقیانوس‌شناسی و علوم جوی برداشته شد و مورد بررسی‌های رسوب­شناختی قرار گرفت. در ابتدا ضریب مغناطیسی تمامی مغزه‌ها براساس دستگاه سنجش ضریب مغناطیسی با فواصل یک سانتی‌متر اندازه‌گیری شد و سپس آنالیزهای پایه رسوب‌شناختی شامل مطالعات دانه‌بندی به روش لیزری و مطالعات اندازه‌گیری کربنات کلسیم و اندازه‌گیری مواد آلی صورت گرفت. در نهایت چهار نمونه گیاهی برای تعیین سن در طول مغزه انتخاب و جهت تعیین سن به آزمایشگاه کربن 14 لهستان ارسال گردید و مشخص شد مطالعه انجام گرفته حدود 15000 سال گذشته را در بر می‌گیرد. با کنار هم گذاشتن مجموعه داده‌ها می­توان 5 دوره کلی آب و هوایی را نشان داد. در دوره اول از 15 هزار سال گذشته تا حدود 13 هزار سال شرایط آب و هوایی سردتر و بسیار مرطوب­تر شده که حکایت از اتمام دوره یخبندان و شروع دوران بین یخچالی دارد. در دوره دوم از 13 هزار سال تا حدود 11 هزار سال شرایط اقلیمی ازدوره قبل کمی گرمتر بوده است. دوره سوم از 11 تا 9 هزار سال قبل که به دلیل نوسانات زیاد، دوران گذار نامگذاری گردید. دوره چهارم از 9 هزار سال قبل تا 7000 سال قبل دوران سردتری بوده است. سرانجام دوره پنجم از 7000 سال قبل به بعد شرایط اقلیمی الگوی امروزی را داشته وتاکنون حفظ شده است. این دوره به طور عموم دوران گرم­تر و خشک‌تری نسبت به گذشته بوده است.
کلیدواژه‌ها
دیرینه‌شناسی اقلیمی
تالاب دشت ارژن
کربنات کلسیم
مغناطیس سنجی
دانه بندی لیزری
تغییرات آب و هوایی

عنوان مقاله English

Paleohydrology based on sedimentology on Dasht e Arzhan basin SW Iran

نویسندگان English

zahra sadat Hoseini 1
shahriar khaledi 1
Abdolmajid Naderi Bani 2
1 shahid beheshti university
2 National Institute of Oceanography and Atmospheric Science
چکیده English

Paleo-climate reconstructions based on multi-proxy such as sedimentology is current in climatology investigation. In this way, National Institute of Oceanography and Atmospheric Science cored 960cm from Arzhan wetland SW of Iran than we have investigated of sedimentology. Primarily the core was measured on magnetic sensibility per 1cm and secondly was subsampled according to magnetic sensibility and were analyzed include TOC, CaCO3, and Grading laser and etc. Finally four samples of pace of plant were selected and have been dated in carbon 14 dating laboratory of Poznan, Poland, and calibrated trough of core based on Calib rev. 7.1. Dating have determined that core had covered 15000 Cal. BP. According to this investigation, we obtained 5 period of climate conditions during Pleistocene to Holocene in this area. 15000-13000 Cal. BP. Late Pleistocene climate conditions were colder and wetter period that indicate end of the Ace age. 13000-11000 Cal. BP. Climate begin to warmer and dryer. 11000-9000Cal.BP. because of this period shows many fluctuations in all proxies we named this period to the period of transfer from ace age to interglacial period. 9000-7000Cal. BP there have been warm and cold conditions compare to late Holocene. 7000- Present indeed in this period radiantly modern pattern of atmospheric circulation has been performed due to all of proxies in late Holocene begin to fixed on the same pattern. So probably atmospheric circulation from meddle Holocene begin to get harmonic to present. Any way for determinate of paleo-climate in this area we need to use of multi proxy investigation in area.

کلیدواژه‌ها English

Paleoclimate
Sedimentology
magnetic sensibility
CaCO3
TOC
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