کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6428785 1634756 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isotopic composition of carbonate-bound organic nitrogen in deep-sea scleractinian corals: A new window into past biogeochemical change
ترجمه فارسی عنوان
ترکیب ایزوتوپ نیتروژن آلی نیتروژن آلی کربناته در مرجان های اسکلراتین دریایی عمیق دریایی: یک پنجره جدید به تغییر بیوگرافی شیمیایی گذشته
کلمات کلیدی
ایزوتوپهای نیتروژن، مرجانهای اسکلراکتانیک عمیق دریا، چرخه نیتروژن اقیانوس، پالئوساجوگرافی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی


- Nitrogen isotopes of carbonate-bound organics in deep-sea Scleractinia are measured.
- D. dianthus CB-δ15N is correlated with the δ15N of N export from the surface ocean.
- D. dianthus acquires its nutrition primarily from suspended POM.

Over the last two decades, the skeletal remains of deep-sea corals have arisen as a geochemical archive of Pleistocene oceanographic change. Here we report the exploration of the isotopic composition of the carbonate-bound organic nitrogen (hereafter, CB-δ15N) in the deep-sea scleractinian coral Desmophyllum dianthus as a possible tool for reconstructing past changes in the ocean nitrogen cycle. The measurement protocol is adapted from a high-sensitivity method for foraminifera shell-bound δ15N. We explored the variability of CB-δ15N within specimens, among corals collected at different depths in a given ocean region, and among different ocean regions. Modern D. dianthus CB-δ15N is strongly correlated with the δ15N of N export as estimated from sediment traps, shallow subsurface nitrate, and surface sediments, suggesting that CB-δ15N is a reliable proxy for δ15N of N export. D. dianthus CB-δ15N is consistently 8-9‰ higher than δ15N of N export, indicating that D. dianthus acquires its nutrition primarily from suspended particulate organic matter (POM) that derives from sinking POM, not directly from sinking POM.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 400, 15 August 2014, Pages 243-250
نویسندگان
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