@article {3005,
	title = {Sediment Accumulation and Carbon Burial in Four Hadal Trench Systems},
	journal = {Journal of Geophysical Research: Biogeosciences},
	volume = {n/a},
	year = {2022},
	note = {<p>e2022JG006814 2022JG006814</p>},
	month = {09/2022},
	pages = {e2022JG006814},
	abstract = {Hadal trenches are considered to act as depocenters for organic material, although pathways for the material transport and deposition rates are poorly constrained. Here we assess focusing, deposition and accumulation of material and organic carbon in four hadal trench systems underlying different surface ocean productivities; the eutrophic Atacama and Kuril-Kamchatka trenches, the mesotrophic Kermadec trench and the oligotrophic Mariana Trench. The study is based on the distributions of naturally occurring 210Pbex, 137Cs and total organic carbon from recovered sediment cores and by applying previously quantified benthic mineralization rates. Periods of steady deposition and discreet mass-wasting deposits were identified from the profiles and the latter were associated with historic recorded seismic events in the respective regions. During periods without mass wasting, the estimated focusing factors along trench axes were elevated, suggesting more or less continuous downslope focusing of material towards the interior of the trenches. The estimated organic carbon deposition rates during these periods exhibited extensive site-specific variability, but were generally similar to values encountered at much shallower settings such as continental slopes and margins. Organic carbon deposition rates during periods of steady deposition were not mirrored by surface ocean productivity, but appeared confounded by local bathymetry. The inclusion of deposition mediated by mass-wasting events enhanced the sediment and organic carbon accumulations for the past \~{}150 years by up to a factor of \~{}4. Thus, due to intensified downslope material focusing and infrequent mass-wasting events, hadal trenches are important sites for deposition and sequestration of organic carbon in the deep sea.},
	keywords = {focusing factor, Hadal trench, mass accumulation rate, mass-wasting event, organic carbon deposition rate, radionuclides},
	isbn = {2169-8961},
	doi = {10.1029/2022JG006814},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1029/2022JG006814},
	author = {Oguri, Kazumasa and Masqu{\'e}, Pere and Zabel, Matthias and Stewart, Heather A. and MacKinnon, Gillian and Rowden, Ashley A. and Berg, Peter and Wenzh{\"o}fer, Frank and Glud, Ronnie N.}
}
@article {37,
	title = {Microbial biomarkers support organic carbon transport from methane-rich Amazon wetlands to the shelf and deep sea fan during recent and glacial climate conditions},
	journal = {Organic Geochemistry},
	volume = {67},
	year = {2014},
	pages = {85-98},
	abstract = {We have investigated the delivery of terrestrial organic carbon (OC) to the Amazon shelf and deep sea fan based on soil marker bacteriohopanepolyols (BHPs; adenosylhopane and related compounds) and branched glycerol dialkyl glycerol tetraethers (GDGTs), as well as on 14C dating of bulk organic matter. The microbial biomarker records show persistent burial of terrestrial OC, evidenced by almost constant and high BIT values (0.6) and soil marker BHP concentration [80{\textendash}230 μg/g TOC (total OC)] on the late Holocene shelf and even higher BIT values (0.8{\textendash}0.9), but lower and more variable soil-marker BHP concentration (40{\textendash}100 μg/g TOC), on the past glacial deep sea fan. Radiocarbon data show that OC on the shelf is 3{\textendash}4 kyr older than corresponding bivalve shells, emphasizing the presence of old carbon in this setting. We observe comparable and unexpectedly invariant BHP composition in both marine sediment records, with a remarkably high relative abundance of C-35 amino BHPs including compounds specific for aerobic methane oxidation on the shelf (avg. 50\% of all BHPs) and the fan (avg. 40\%). Notably, these marine BHP signatures are strikingly similar to those of a methane-producing floodplain area in one of the Amazonian wetland (v{\'a}rzea) regions. The observation indicates that BHPs in the marine sediments may have initially been produced within wetland regions of the Amazon basin and may therefore document persistent export from terrestrial wetland regions, with subsequent re-working in the marine environment, both during recent and past glacial climate conditions.},
	issn = {0146-6380},
	doi = {10.1016/j.orggeochem.2013.12.003},
	url = {http://www.sciencedirect.com/science/article/pii/S0146638013002714},
	author = {Wagner, Thomas and Kallweit, Wiebke and Talbot, Helen M. and Mollenhauer, Gesine and Boom, Arnoud and Zabel, Matthias}
}
@conference {1601,
	title = {Cross-shelf lateral transport in the Benguela Upwelling System: Aging of marine organic matter in the benthic boundary layer},
	booktitle = {Ocean Sciences Meeting},
	year = {2006},
	note = {id: 545},
	month = {2006},
	address = {Honollulu, Hawaii USA},
	author = {Mollenhauer, Gesine and Inthorn, Maik and Zabel, Matthias and Damste, Jaap Sinninghe and Eglinton, Timothy I.}
}
