Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Cecily C. Y. Chang"'
Publikováno v:
Hydrological Processes. 18:2699-2712
The natural abundance of nitrogen and oxygen isotopes in nitrate can be a powerful tool for identifying the source of nitrate in streamwater in forested watersheds, because the two main sources of nitrate, atmospheric deposition and microbial nitrifi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::20ba944f95ef7eaf5896266c27f1ec7b
https://doi.org/10.1002/hyp.5576
https://doi.org/10.1002/hyp.5576
Autor:
John M. Melack, Delores M. Lucero, Al Leydecker, Cecily C. Y. Chang, James O. Sickman, Carol Kendall, Joshua P. Schimel
Publikováno v:
Biogeochemistry. 64:1-24
Mechanisms underlying catchment export of nitrogen (N) during seasonal transitions (i.e., winter to spring and summer to autumn) were investigated in high-elevation catchments of the Sierra Nevada using stable isotopes of nitrate and water, intensive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::568e98fcaac295ae05609c8837135666
https://doi.org/10.1023/a:1024928317057
https://doi.org/10.1023/a:1024928317057
Publikováno v:
Canadian Journal of Fisheries and Aquatic Sciences. 59:1874-1885
A study was conducted to determine whether NO3 stable isotopes (δ15N and δ18O), at natural abundance levels, could discriminate among NO3 sources from sites with different land uses at the basin scale. Water samples were collected from 24 sites
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6169032ac588f4d88a22109ba6d3f0be
https://doi.org/10.1139/f02-153
https://doi.org/10.1139/f02-153
Publikováno v:
Hydrological Processes. 15:1285-1300
An Erratum has been published for this article in Hydrological Processes 16(5) 2002, 1129–1130. Nitrate (NO3) and other nutrients discharged by the Mississippi River are suspected of causing a zone of depleted dissolved oxygen (hypoxic zone) in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::365c9179ebe20318e133fea3ef25608c
https://doi.org/10.1002/hyp.214
https://doi.org/10.1002/hyp.214
Autor:
Cecily C. Y. Chang, Donald H. Wilkison, Ronald J. Avanzino, Steven R. Silva, Carol Kendall, A.C. Ziegler
Publikováno v:
Journal of Hydrology. 228:22-36
A new method for concentrating nitrate from fresh waters for δ15N and δ18O analysis has been developed and field-tested for four years. The benefits of the method are: (1) elimination of the need to transport large volumes of water to the laborator
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6948b6174080f12ef2a67021181fccd3
https://doi.org/10.1016/s0022-1694(99)00205-x
https://doi.org/10.1016/s0022-1694(99)00205-x
Autor:
Cecily C. Y. Chang, Steven R. Silva, James Langston, Mike Riggs, Carol Kendall, Donald H. Campbell
Publikováno v:
Canadian Journal of Fisheries and Aquatic Sciences. 56:1856-1864
Recently, methods have been developed to analyze NO3- for δ15N and δ18O, improving our ability to identify NO3- sources and transformations. However, none of the existing methods are suited for waters with low NO3- concentrations (0.7-10 µM). We d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f658f1861c5c99c3363f5fddb89d0114
https://doi.org/10.1139/f99-126
https://doi.org/10.1139/f99-126
Autor:
Richard Petersen, Cecily C. Y. Chang
Publikováno v:
Canadian Journal of Fisheries and Aquatic Sciences. 52:54-62
Nous avons recueilli des echantillons d'eau du lac Tahoe a des stations situees au milieu du lac et pres du rivage, a trois profondeurs (25, 50 et 75 m, ce qui correspondait a un eclairement d'environ 10, 1 et 0,1% de l'intensite lumineuse a la surfa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e20d6617c403bc9ada1e5ec2603167a
https://doi.org/10.1139/f95-005
https://doi.org/10.1139/f95-005
Publikováno v:
Canadian Journal of Fisheries and Aquatic Sciences. 49:1206-1215
Field measurements and bioassay experiments were coupled to investigate the interdependent processes affecting phytoplankton biomass at Lake Tahoe using a trace metal protocol. Water samples were analyzed for suspended particulate matter, dissolved o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a082a89674d2e4ad7b4786d280bd9730
https://doi.org/10.1139/f92-136
https://doi.org/10.1139/f92-136
Publikováno v:
Journal of Environmental Engineering. 116:394-409
Chemical and biological interactions involving arsenic (As) and phosphorus (P) appear to affect significantly As transport and distribution in Whitewood Creek, South Dakota. Data (first‐order uptake rate constants, standing crop, and accumulation f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::14a7ea44abca5699f6954e57ec893296
https://doi.org/10.1061/(asce)0733-9372(1990)116:2(394)
https://doi.org/10.1061/(asce)0733-9372(1990)116:2(394)
Preparation and Analysis of Nitrogen-bearing Compounds in Water for Stable Isotope Ratio Measurement
Autor:
Steven R. Silva, Carol Kendall, Greg Michalski, Karen L. Casciotti, Scott D. Wankel, Cecily C. Y. Chang
Publisher Summary This chapter reviews methods for analyzing "natural abundance" nitrogen-bearing compounds in water for δ 15 N, δ 18 O, and δ 17 O. The techniques that are reviewed are Kjeldahl distillation and digestion, diffusion, micro diffusi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65417e4f9fb5f781d261e3becc4b9088
https://doi.org/10.1016/b978-044451114-0/50017-x
https://doi.org/10.1016/b978-044451114-0/50017-x
