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A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma 5
Lattaud, Julie; Lo, Li; Zeeden, Christian; Liu, Ya-jun; Song, Sheng-rong; Van Der Meer, Marcel T.j.; Sinninghe Damsté, Jaap S.; Schouten, Stefan.
Long-chain diols have been detected in a wide range of environments and have been used to reconstruct past environmental changes, however only a few long-term records exist to date. Here we reconstructed past environmental changes in the central Sea of Okhotsk over the last 1.5 million years, covering the Mid-Pleistocene Transition (MPT). Sea surface temperatures (SST) reconstructed using the Long-Chain Diol Index (LDI) reflects glacial/interglacial changes. However, when compared with other organic paleothermometers (Uk’37 and TEXL86) the LDI-SST is lower during interglacials and similar or higher during glacials, possibly suggesting a shift of diol production season during interglacials. The LDI-SST does not change in periodicity around the MPT as...
Tipo: Text Palavras-chave: Sea of Okhotsk; Mid-Pleistocene Transition; LDI; TEX86; U-37(K)'; Biogenic opal; Long-chain diols.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60060/63342.pdf
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Latitudinal patterns of export production recorded in surface sediments of the Chilean Patagonian fjords (41-55 degrees S) as a response to water column productivity 5
Aracena, Claudia; Lange, Carina B.; Iriarte, Jose Luis; Rebolledo, Lorena; Pantoja, Silvio.
The Chilean Patagonian fjords region (41-56 degrees S) is characterized by highly complex geomorphology and hydrographic conditions, and strong seasonal and latitudinal patterns in precipitation, freshwater discharge, glacier coverage, and light regime; all of these directly affect biological production in the water column. In this study, we compiled published and new information on water column properties (primary production, nutrients) and surface sediment characteristics (biogenic opal, organic carbon, molar C/N, bulk sedimentary delta(13)C(org)) from the Chilean Patagonian fjords between 41 degrees S and 55 degrees S, describing herein the latitudinal pattern of water column productivity and its imprint in the underlying sediments. Based on information...
Tipo: Text Palavras-chave: Biogenic opal; Organic carbon; Stable carbon isotopes; Primary production; Fjords; Patagonia.
Ano: 2011 URL: https://archimer.ifremer.fr/doc/00214/32519/30998.pdf
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