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| D'Hondt, Steven; Inagaki, Fumio; Zarikian, Carlos Alvarez; Abrams, Lewis J.; Dubois, Nathalie; Engelhardt, Tim; Evans, Helen; Ferdelman, Timothy; Gribsholt, Britta; Harris, Robert N.; Hoppie, Bryce W.; Hyun, Jung-ho; Kallmeyer, Jens; Kim, Jinwook; Lynch, Jill E.; Mckinley, Claire C.; Mitsunobu, Satoshi; Morono, Yuki; Murray, Richard W.; Pockalny, Robert; Sauvage, Justine; Shimono, Takaya; Shiraishi, Fumito; Smith, David C.; Smith-duque, Christopher E.; Spivack, Arthur J.; Steinsbu, Bjorn Olav; Suzuki, Yohey; Szpak, Michal; Toffin, Laurent; Uramoto, Goichiro; Yamaguchi, Yasuhiko T.; Zhang, Guo-liang; Zhang, Xiao-hua; Ziebis, Wiebke. |
| The depth of oxygen penetration into marine sediments differs considerably from one region to another. In areas with high rates of microbial respiration, O2 penetrates only millimetres to centimetres into the sediments, but active anaerobic microbial communities are present in sediments hundreds of metres or more below the sea floor. In areas with low sedimentary respiration, O2 penetrates much deeper but the depth to which microbial communities persist was previously unknown. The sediments underlying the South Pacific Gyre exhibit extremely low areal rates of respiration. Here we show that, in this region, microbial cells and aerobic respiration persist through the entire sediment sequence to depths of at least 75 metres below sea floor. Based on the... |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00255/36658/35265.pdf |
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| Dubois, Nathalie; Kienast, Markus; Kienast, Stephanie S.; Timmermann, Axel. |
| Amplifying both internally generated variability and remote climate signals from the Atlantic Ocean via coupled air-sea instabilities, the eastern tropical Pacific (ETP) is well situated to detect past climate changes and variations in Central American wind systems that dynamically link the Atlantic and the Pacific. Here we compare new and previously published alkenone-based sea surface temperature (SST) reconstructions from diverse environments within the ETP, i.e. the Eastern Pacific Warm Pool (EPWP), the equatorial and the northern Peruvian Upwelling regions over the past 100,000 yr. Over this time period, a fairly constant meridional temperature gradient across the region is observed, indicating similar hydro-graphic conditions during glacial and... |
| Tipo: Text |
Palavras-chave: Eastern Pacific; Heinrich events winds sea surface temperature alkenone; EOF. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40127/83000.pdf |
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