کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8867629 | 1621621 | 2018 | 37 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Orbital, tectonic and oceanographic controls on Pliocene climate and atmospheric circulation in Arctic Norway
ترجمه فارسی عنوان
کنترل مدارهای زمینی و اقیانوس شناختی بر آب و هوای پیلوسان و گردش جوی در قطب شمال نروژ
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کلمات کلیدی
گرده، زندگی گیاهی، پیلئوسن، شمال شرقی اقیانوس آرام، راه آب مرکزی آمریکا،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
During the Pliocene Epoch, a stronger-than-present overturning circulation has been invoked to explain the enhanced warming in the Nordic Seas region in comparison to low to mid-latitude regions. While marine records are indicative of changes in the northward heat transport via the North Atlantic Current (NAC) during the Pliocene, the long-term terrestrial climate evolution and its driving mechanisms are poorly understood. We present the first two-million-year-long Pliocene pollen record for the Nordic Seas region from Ocean Drilling Program (ODP) Hole 642B, reflecting vegetation and climate in Arctic Norway, to assess the influence of oceanographic and atmospheric controls on Pliocene climate evolution. The vegetation record reveals a long-term cooling trend in northern Norway, which might be linked to a general decline in atmospheric CO2 concentrations over the studied interval, and climate oscillations primarily controlled by precession (23Â kyr), obliquity (54Â kyr) and eccentricity (100Â kyr) forcing. In addition, the record identifies four major shifts in Pliocene vegetation and climate mainly controlled by changes in northward heat transport via the NAC. Cool temperate (warmer than present) conditions prevailed between 5.03-4.30Â Ma, 3.90-3.47Â Ma and 3.29-3.16Â Ma and boreal (similar to present) conditions predominated between 4.30-3.90Â Ma, 3.47-3.29 and after 3.16Â Ma. A distinct decline in sediment and pollen accumulation rates at c. 4.65Â Ma is probably linked to changes in ocean currents, marine productivity and atmospheric circulation. Climate model simulations suggest that changes in the strength of the Atlantic Meridional Overturning Circulation during the Early Pliocene could have affected atmospheric circulation in the Nordic Seas region, which would have affected the direction of pollen transport from Scandinavia to ODP Hole 642B.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Global and Planetary Change - Volume 161, February 2018, Pages 183-193
Journal: Global and Planetary Change - Volume 161, February 2018, Pages 183-193
نویسندگان
Sina Panitz, Ulrich Salzmann, Bjørg Risebrobakken, Stijn De Schepper, Matthew J. Pound, Alan M. Haywood, Aisling M. Dolan, Daniel J. Lunt,