Výsledky vyhledávání - "G. M. Santos"

Akademický článek

Application of the ECT9 protocol for radiocarbon-based source apportionment of carbonaceous aerosols

Autor: L. Huang, W. Zhang, G. M. Santos, B. T. Rodríguez, S. R. Holden, V. Vetro, C. I. Czimczik

Publikováno v: Atmospheric Measurement Techniques, Vol 14, Pp 3481-3500 (2021)

Carbonaceous aerosol is mainly composed of organic carbon (OC) and elemental carbon (EC). Both OC and EC originate from a variety of emission sources. Radiocarbon (14C) analysis can be used to apportion bulk aerosol, OC, and EC into their sources. Ho

Externí odkaz: https://doaj.org/article/3b1776b35a4648f1b08781d60e76690c

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Akademický článek

Inter-comparison of elemental and organic carbon mass measurements from three North American national long-term monitoring networks at a co-located site

Autor: T. W. Chan, L. Huang, K. Banwait, W. Zhang, D. Ernst, X. Wang, J. G. Watson, J. C. Chow, M. Green, C. I. Czimczik, G. M. Santos, S. Sharma, K. Jones

Publikováno v: Atmospheric Measurement Techniques, Vol 12, Pp 4543-4560 (2019)

Carbonaceous aerosol is a major contributor to the total aerosol load and being monitored by diverse measurement approaches. Here, 10 years (2005–2015) of continuous carbonaceous aerosol measurements collected at the Centre of Atmospheric Research

Externí odkaz: https://doaj.org/article/4d999089048a46eca1819ade75e1a2c5

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Akademický článek

Direct uptake of organically derived carbon by grass roots and allocation in leaves and phytoliths: 13C labeling evidence

Autor: A. Alexandre, J. Balesdent, P. Cazevieille, C. Chevassus-Rosset, P. Signoret, J.-C. Mazur, A. Harutyunyan, E. Doelsch, I. Basile-Doelsch, H. Miche, G. M. Santos

Publikováno v: Biogeosciences, Vol 13, Iss 5, Pp 1693-1703 (2016)

In the rhizosphere, the uptake of low-molecular-weight carbon (C) and nitrogen (N) by plant roots has been well documented. While organic N uptake relative to total uptake is important, organic C uptake is supposed to be low relative to the plant's C

Externí odkaz: https://doaj.org/article/c72c6ee790724006ba6fe0a17d472436

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Akademický článek

Unambiguous evidence of old soil carbon in grass biosilica particles

Autor: P. E. Reyerson, A. Alexandre, A. Harutyunyan, R. Corbineau, H. A. Martinez De La Torre, F. Badeck, L. Cattivelli, G. M. Santos

Publikováno v: Biogeosciences, Vol 13, Iss 4, Pp 1269-1286 (2016)

Plant biosilica particles (phytoliths) contain small amounts of carbon called phytC. Based on the assumptions that phytC is of photosynthetic origin and a closed system, claims were recently made that phytoliths from several agriculturally important

Externí odkaz: https://doaj.org/article/4c6d9dca0adc4fe2a50434cfe18dab04

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Akademický článek

Accuracy and precision of 14C-based source apportionment of organic and elemental carbon in aerosols using the Swiss_4S protocol

Autor: G. O. Mouteva, S. M. Fahrni, G. M. Santos, J. T. Randerson, Y.-L. Zhang, S. Szidat, C. I. Czimczik

Publikováno v: Atmospheric Measurement Techniques, Vol 8, Iss 9, Pp 3729-3743 (2015)

Aerosol source apportionment remains a critical challenge for understanding the transport and aging of aerosols, as well as for developing successful air pollution mitigation strategies. The contributions of fossil and non-fossil sources to organic c

Externí odkaz: https://doaj.org/article/5f108808cf1e4a258ed54b3c67cdd428

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Akademický článek

New highlights of phytolith structure and occluded carbon location: 3-D X-ray microscopy and NanoSIMS results

Autor: A. Alexandre, I. Basile-Doelsch, T. Delhaye, D. Borshneck, J. C. Mazur, P. Reyerson, G. M. Santos

Publikováno v: Biogeosciences, Vol 12, Iss 3, Pp 863-873 (2015)

Phytoliths contain occluded organic compounds called phytC. Recently, phytC content, nature, origin, paleoenvironmental meaning and impact in the global C cycle have been the subject of increasing debate. Inconsistencies were fed by the scarcity of i

Externí odkaz: https://doaj.org/article/723f02dd571a425ebc3b9e37a5f1a01b

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Akademický článek

Possible source of ancient carbon in phytolith concentrates from harvested grasses

Autor: G. M. Santos, A. Alexandre, J. R. Southon, K. K. Treseder, R. Corbineau, P. E. Reyerson

Publikováno v: Biogeosciences, Vol 9, Iss 5, Pp 1873-1884 (2012)

Plants absorb and transport silicon (Si) from soil, and precipitation of Si within the living plants results in micrometric amorphous biosilica particles known as phytoliths. During phytolith formation, a small amount of carbon (2) via photosynthesis

Externí odkaz: https://doaj.org/article/cfe2cd018a6547aa9afef39249e5547a

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