Fluctuations in export productivity over the last century from sediments of a southern Chilean fjord (44°S)

View/ Open
Date
2005-07-08Author
Sepulveda, Julio
Concept link
Pantoja, Silvio
Concept link
Hughen, Konrad A.
Concept link
Lange, Carina B.
Concept link
Gonzalez, Fidelina
Concept link
Munoz, Praxedes
Concept link
Rebolledo, Lorena
Concept link
Castro, Rodrigo
Concept link
Contreras, Sergio
Concept link
Avila, Alejandro
Concept link
Rossel, Pamela
Concept link
Lorca, Gisella
Concept link
Salamanca, Marco
Concept link
Silva, Nelson
Concept link
Metadata
Show full item recordCitable URI
https://hdl.handle.net/1912/397As published
https://doi.org/10.1016/j.ecss.2005.07.005Keyword
Paleoproductivity; Organic matter; Fjords; ChileAbstract
Here we present the first reconstruction of changes in surface primary production during the last
century from the Puyuhuapi fjord in southern Chile, using a variety of parameters (diatoms, biogenic
silica, total organic carbon, chlorins, and proteins) as productivity proxies. Two sediment cores from
the head and the center of the fjord were analyzed and compared to gain insights on past changes in
productivity in these two different depositional environments. Higher sedimentation rates found at the
head of the fjord result from the combination of a shallower water column and a restricted circulation
by the occurrence of a sill. Additionally, sediment mixing depths estimated from 210Pb data suggest that
suboxic conditions may dominate the bottom water and the sediment-water interface in this location.
Productivity of the Puyuhuapi fjord during the last century was characterized by a constant
increase from the late 19th century to the early 1980s, then decreased until the late-1990s, and then rose
again to present-day values. The influence of rainfall on productivity was most noticeable during
periods of low rainfall, which coincided with decreased overall productivity within the Puyuhuapi fjord.
Simultaneous variations in productivity and rainfall in the study area suggest that marine productivity
could respond to atmospheric-oceanic interactions at a local scale. At a regional scale, marine
productivity of the area may be related to other large-scale processes such as the El Niño Southern
Oscillation.
Description
Author Posting. © The Authors, 2005. This is the author's version of the work. It is
posted here by permission of Elsevier B. V. for personal use, not for redistribution. The
definitive version was published in Estuarine, Coastal and Shelf Science 65 (2005): 587-600, doi:10.1016/j.ecss.2005.07.005.
Collections
Suggested Citation
Preprint: Sepulveda, Julio, Pantoja, Silvio, Hughen, Konrad A., Lange, Carina B., Gonzalez, Fidelina, Munoz, Praxedes, Rebolledo, Lorena, Castro, Rodrigo, Contreras, Sergio, Avila, Alejandro, Rossel, Pamela, Lorca, Gisella, Salamanca, Marco, Silva, Nelson, "Fluctuations in export productivity over the last century from sediments of a southern Chilean fjord (44°S)", 2005-07-08, https://doi.org/10.1016/j.ecss.2005.07.005, https://hdl.handle.net/1912/397Related items
Showing items related by title, author, creator and subject.
-
The dynamics of shelf forcing in Greenlandic fjords
Jackson, Rebecca H.; Lentz, Steven J.; Straneo, Fiamma (American Meteorological Society, 2018-11-15)The fjords that connect Greenland’s glaciers to the ocean are gateways for importing heat to melt ice and for exporting meltwater into the ocean. The transport of heat and meltwater can be modulated by various drivers of ... -
Heat, salt, and freshwater budgets for a glacial fjord in Greenland
Jackson, Rebecca H.; Straneo, Fiamma (American Meteorological Society, 2016-09-01)In Greenland’s glacial fjords, heat and freshwater are exchanged between glaciers and the ocean. Submarine melting of glaciers has been implicated as a potential trigger for recent glacier acceleration, and observations ... -
Export of strongly diluted Greenland meltwater from a major glacial fjord
Beaird, Nicholas; Straneo, Fiamma; Jenkins, William J. (John Wiley & Sons, 2018-05-05)The Greenland Ice Sheet has been, and will continue, losing mass at an accelerating rate. The influence of this anomalous meltwater discharge on the regional and large‐scale ocean could be considerable but remains poorly ...