کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5783367 | 1637958 | 2017 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Atmospheric measurements of Î17O in CO2 in Göttingen, Germany reveal a seasonal cycle driven by biospheric uptake
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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![عکس صفحه اول مقاله: Atmospheric measurements of Î17O in CO2 in Göttingen, Germany reveal a seasonal cycle driven by biospheric uptake Atmospheric measurements of Î17O in CO2 in Göttingen, Germany reveal a seasonal cycle driven by biospheric uptake](/preview/png/5783367.png)
چکیده انگلیسی
Our triple oxygen isotope data are reported as Î17O values relative to a CO2-water equilibration line with Î17O = ln (δ17O + 1) â 0.5229 Ã ln (δ18O + 1). We report an average of -0.02 ± 0.05â° (SD) in the first year and -0.12 ± 0.04â° (SD) in the second year of our measurements. This year-to-year difference is higher than expected based on other available Î17O records, but careful scrutiny of our measurement approach did not reveal obvious analytical biases, leaving this aspect of our record unexplained. After removing the year-to-year trend, our time series shows a statistically robust seasonal cycle with maximum values in June/July and an amplitude (peak-to-trough) of 0.13 ± 0.02â°. We compare our observational data to a revised triple oxygen isotope mass balance “box” model of tropospheric CO2 where we reconcile both 18O/16O and 17O/16O fractionation processes. We also compare them to Göttingen-specific output from a three-dimensional transport model simulation of Î17O in CO2 performed with the Tracer Model 5 (TM5). Both the modeled isofluxes at the surface, and the modeled stratospheric, fossil, and biospheric Î17O components in the atmosphere at Göttingen confirm that the observed seasonal cycle in Î17O is driven primarily by the seasonal cycle of gross primary productivity (GPP), and that the seasonal variations in both stratospheric transport and fossil fuel emissions play a minor role at our location. Our results therefore strengthen earlier suggestions that GPP is reflected in Î17O, and call for more seasonally resolved measurements at continental locations like Göttingen.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 199, 15 February 2017, Pages 143-163
Journal: Geochimica et Cosmochimica Acta - Volume 199, 15 February 2017, Pages 143-163
نویسندگان
M.E.G. Hofmann, B. Horváth, L. Schneider, W. Peters, K. Schützenmeister, A. Pack,