Zobrazeno 1 - 10
of 1 366
pro vyhledávání: '"F. Janssen"'
Autor:
X. Peng, D. J. Yousavich, A. Bourbonnais, F. Wenzhöfer, F. Janssen, T. Treude, D. L. Valentine
Publikováno v:
Biogeosciences, Vol 21, Pp 3041-3052 (2024)
Despite long-standing interest in the biogeochemistry of the Santa Barbara Basin (SBB), there are no direct rate measurements of different nitrogen transformation processes. We investigated benthic nitrogen cycling using in situ incubations with 15NO
Externí odkaz:
https://doaj.org/article/f422b8eed1de423aa5da2c680334b963
Autor:
D. J. Yousavich, D. Robinson, X. Peng, S. J. E. Krause, F. Wenzhöfer, F. Janssen, N. Liu, J. Tarn, F. Kinnaman, D. L. Valentine, T. Treude
Publikováno v:
Biogeosciences, Vol 21, Pp 789-809 (2024)
The Santa Barbara Basin naturally experiences transient deoxygenation due to its unique geological setting in the southern California Borderland and seasonal changes in ocean currents. Long-term measurements of the basin showed that anoxic events and
Externí odkaz:
https://doaj.org/article/987e81ce2cad4b938544800469217697
Autor:
D. Robinson, A. L. D. Pham, D. J. Yousavich, F. Janssen, F. Wenzhöfer, E. C. Arrington, K. M. Gosselin, M. Sandoval-Belmar, M. Mar, D. L. Valentine, D. Bianchi, T. Treude
Publikováno v:
Biogeosciences, Vol 21, Pp 773-788 (2024)
The trace metal iron (Fe) is an essential micronutrient that controls phytoplankton productivity, which subsequently affects organic matter cycling with feedback on the cycling of macronutrients. Along the continental margin of the US West Coast, hig
Externí odkaz:
https://doaj.org/article/0396230a454e45feaa537def48b715cc
Autor:
S. J. E. Krause, J. Liu, D. J. Yousavich, D. Robinson, D. W. Hoyt, Q. Qin, F. Wenzhöfer, F. Janssen, D. L. Valentine, T. Treude
Publikováno v:
Biogeosciences, Vol 20, Pp 4377-4390 (2023)
The recently discovered cryptic methane cycle in the sulfate-reducing zone of marine and wetland sediment couples methylotrophic methanogenesis to anaerobic oxidation of methane (AOM). Here we present evidence of cryptic methane cycling activity with
Externí odkaz:
https://doaj.org/article/33048a50b9c74cc897e0bbf081b3f900
Publikováno v:
Biogeosciences, Vol 17, Pp 3203-3222 (2020)
Industrial-scale mining of deep-sea polymetallic nodules will remove nodules in large areas of the sea floor. The regrowth of the nodules by metal precipitation is estimated to take millions of years. Thus, for future mining impact studies, it is cru
Externí odkaz:
https://doaj.org/article/f1ec1acb82054dc29fc7a08b64efc3ac
Publikováno v:
Biogeosciences, Vol 17, Pp 2767-2789 (2020)
Deep-sea mining for polymetallic nodules is expected to have severe environmental impacts because not only nodules but also benthic fauna and the upper reactive sediment layer are removed through the mining operation and blanketed by resettling mater
Externí odkaz:
https://doaj.org/article/704a3f931a5d482ebf15800b5df6d85d
Autor:
U. Braeckman, F. Janssen, G. Lavik, M. Elvert, H. Marchant, C. Buckner, C. Bienhold, F. Wenzhöfer
Publikováno v:
Biogeosciences, Vol 15, Pp 6537-6557 (2018)
In the Arctic Ocean, increased sea surface temperature and sea ice retreat have triggered shifts in phytoplankton communities. In Fram Strait, coccolithophorids have been occasionally observed to replace diatoms as the dominating taxon of spring b
Externí odkaz:
https://doaj.org/article/2633c78edfd14fda9cd4ec8f8430e313
Evaluation of numerical models by FerryBox and fixed platform in situ data in the southern North Sea
Publikováno v:
Ocean Science, Vol 11, Iss 6, Pp 879-896 (2015)
For understanding and forecasting of hydrodynamics in coastal regions, numerical models have served as an important tool for many years. In order to assess the model performance, we compared simulations to observational data of water temperature and
Externí odkaz:
https://doaj.org/article/012aadfcd56446dc962aab3efa3af99d
Autor:
A. Lichtschlag, D. Donis, F. Janssen, G. L. Jessen, M. Holtappels, F. Wenzhöfer, S. Mazlumyan, N. Sergeeva, C. Waldmann, A. Boetius
Publikováno v:
Biogeosciences, Vol 12, Iss 16, Pp 5075-5092 (2015)
The outer western Crimean shelf of the Black Sea is a natural laboratory to investigate effects of stable oxic versus varying hypoxic conditions on seafloor biogeochemical processes and benthic community structure. Bottom-water oxygen concentrations
Externí odkaz:
https://doaj.org/article/8308656da07e4c58b49ddc98fdba77c5
Investigating hypoxia in aquatic environments: diverse approaches to addressing a complex phenomenon
Autor:
J. Friedrich, F. Janssen, D. Aleynik, H. W. Bange, N. Boltacheva, M. N. Çagatay, A. W. Dale, G. Etiope, Z. Erdem, M. Geraga, A. Gilli, M. T. Gomoiu, P. O. J. Hall, D. Hansson, Y. He, M. Holtappels, M. K. Kirf, M. Kononets, S. Konovalov, A. Lichtschlag, D. M. Livingstone, G. Marinaro, S. Mazlumyan, S. Naeher, R. P. North, G. Papatheodorou, O. Pfannkuche, R. Prien, G. Rehder, C. J. Schubert, T. Soltwedel, S. Sommer, H. Stahl, E. V. Stanev, A. Teaca, A. Tengberg, C. Waldmann, B. Wehrli, F. Wenzhöfer
Publikováno v:
Biogeosciences, Vol 11, Iss 4, Pp 1215-1259 (2014)
In this paper we provide an overview of new knowledge on oxygen depletion (hypoxia) and related phenomena in aquatic systems resulting from the EU-FP7 project HYPOX ("In situ monitoring of oxygen depletion in hypoxic ecosystems of coastal and open se
Externí odkaz:
https://doaj.org/article/c5faa8b21db1475d867a7964c780a87b