کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4680983 | 1634934 | 2006 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A climatic control on the accretion of meteoric and super-chondritic iridium-platinum to the Antarctic ice cap
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A climatic control on the accretion of meteoric and super-chondritic iridium-platinum to the Antarctic ice cap A climatic control on the accretion of meteoric and super-chondritic iridium-platinum to the Antarctic ice cap](/preview/png/4680983.png)
چکیده انگلیسی
We have determined iridium and platinum in deep Antarctic ice from Dome C and Vostok dated back to 240Â kyrs BP. We find high super-chondritic fluxes during warm periods and low meteoric accretion during glacial times, a pattern that is opposite to any known climatic variation in dust fallout to polar regions. The proposed explanation of this accretion regime is a weaker polar vortex during warm periods, allowing peripheral air masses enriched in volcanic iridium and platinum to penetrate inland to Antarctica. The MSP signal emerges only during cold phases and is four times lower than in the Greenland ice cap where more snow accumulates. This suggests that wet deposition is an important route of cosmic material to the Earth's surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 250, Issues 3â4, 30 October 2006, Pages 459-469
Journal: Earth and Planetary Science Letters - Volume 250, Issues 3â4, 30 October 2006, Pages 459-469
نویسندگان
Paolo Gabrielli, John M.C. Plane, Claude F. Boutron, Sungmin Hong, Giulio Cozzi, Paolo Cescon, Christophe Ferrari, Paul J. Crutzen, Jean Robert Petit, Vladimir Y. Lipenkov, Carlo Barbante,