Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Robin Keir"'
Publikováno v:
Earth and Planetary Science Letters. 270:338-348
Hydrothermal emission of mantle helium appears to be directly related to magma production rate, but other processes can generate methane and hydrogen on mid-ocean ridges. In an on-going effort to characterize these processes in the South Atlantic, th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::37bc8ae721e499a7d781dc78fd822763
https://doi.org/10.1016/j.epsl.2008.03.054
https://doi.org/10.1016/j.epsl.2008.03.054
Publikováno v:
Geochimica et Cosmochimica Acta. 70:5766-5778
Abiogenic methane may be produced in submarine hydrothermal systems by degassing of basalts or serpentinization of ultramafic outcrops. The latter process presumably releases little primordial helium and is therefore implicated by high CH4/3He ratios
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39011a426625c0fed742190ed4d07fd6
https://doi.org/10.1016/j.gca.2006.06.005
https://doi.org/10.1016/j.gca.2006.06.005
Publikováno v:
Deep Sea Research Part I: Oceanographic Research Papers. 52:1043-1070
Previous work has shown that methane anomalies frequently occur within the rift valley of the Mid-Atlantic Ridge (MAR). The plumes appear confined within the high, steep walls of the valley, and it is not known whether methane may escape to the open
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd7109b816f978e31f1946c8887ba2a1
https://doi.org/10.1016/j.dsr.2004.12.006
https://doi.org/10.1016/j.dsr.2004.12.006
Publikováno v:
Deep Sea Research Part II: Topical Studies in Oceanography. 48:3179-3189
Previous work has shown that during early summer, the partial pressure of CO2 (pCO(2)) in surface waters north of about 45 degreesN in the Atlantic exhibits widespread undersaturation. In many areas. this follows after a "spring bloom" of phytoplankt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f28caa35e5f1b96bbf37781b30399cc2
https://doi.org/10.1016/s0967-0645(01)00036-4
https://doi.org/10.1016/s0967-0645(01)00036-4
Publikováno v:
Aquatic Geochemistry. 4:403-427
The methane concentration in the atmosphere andsurface water was surveyed along 58° N acrossthe North Sea. In addition, the vertical methanedistribution in the water column was determined at sixstations along the transect. The methane contents ofthe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::190e55b03bac60a8d18ca01949907ccf
https://doi.org/10.1023/a:1009644600833
https://doi.org/10.1023/a:1009644600833
Autor:
Jürgen Sültenfuß, Maren Walter, Oliver Schmale, Jens Schneider von Deimling, Sharon L. Walker, Gregor Rehder, Robin Keir
Publikováno v:
Geochemistry, Geophysics, Geosystems. 13
The Logatchev hydrothermal field at 14°45′N on the MAR is characterized by gas plumes that are enriched in methane and helium compared to the oceanic background. We investigated CH4 concentration and δ13C together with δ3He in the water column o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7942030b9f148dd0bbe7f9def30c345
https://doi.org/10.1029/2012gc004158
https://doi.org/10.1029/2012gc004158
Autor:
Robin Keir, Robert L. Michel
Publikováno v:
Geochimica et Cosmochimica Acta. 57:3563-3573
The process of carbonate dissolution at the sediment-water interface has two possible endmember boundary conditions. Either the carbonate particles dissolve mostly before they are incorporated into the sediment by bioturbation (interface dissolution)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::691148adaa501ab300730deb8a75d6b4
https://doi.org/10.1016/0016-7037(93)90139-n
https://doi.org/10.1016/0016-7037(93)90139-n
Autor:
Robin Keir
Publikováno v:
Geophysical Research Letters. 37
The concentrations of methane and hydrogen in hydrothermal vent fluids issuing from mid-ocean ridges tend to fall into two groups, one with high concentrations of these gases in ultramafic-hosted vent fields and a second group with relatively lower c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::889a046c8d7376b2eee16e13cb0aaa8a
https://doi.org/10.1029/2010gl045362
https://doi.org/10.1029/2010gl045362
Publikováno v:
Geochemistry, Geophysics, Geosystems. 10
As methane is consumed in the deep sea, its 13C/12C ratio progressively increases because of kinetic isotope fractionation. Many submarine hydrothermal vents emit methane with carbon isotope ratios that are higher than those of background methane in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::151abd53c62e764ab3586ec838778d82
https://doi.org/10.1029/2009gc002403
https://doi.org/10.1029/2009gc002403
Autor:
Robin Keir
Publikováno v:
Global Biogeochemical Cycles. 5:351-358
Processes that shift nutrients from mid to lower ocean depths may or may not increase the ocean's vertical carbon pump. Redistribution of δ13C produced by these processes is compared in two box models: a vertical three-box ocean and a thirteen-box o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50c9f31c7693a1693b5dfc41908b80a8
https://doi.org/10.1029/91gb01913
https://doi.org/10.1029/91gb01913