globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.06.023
论文题名:
Holocene variations in productivity associated with changes in glacier activity and freshwater flux in the central basin of the Strait of Magellan
作者: Aracena C.; Kilian R.; Lange C.B.; Bertrand S.; Lamy F.; Arz H.W.; De Pol-Holz R.; Baeza O.; Pantoja S.; Kissel C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 436
起始页码: 112
结束页码: 122
语种: 英语
英文关键词: Holocene ; Paleoproductivity ; Strait of Magellan ; Thermohaline conditions
英文摘要: One of the most important factors controlling fjord primary production in southernmost Patagonia is the variability in the thermohaline structure of the water column. In the present-day environment, thermal stratification is mostly related to freshwater input and in particular, the seasonal melting of glaciers. Here we assess whether this relation between fjord productivity and freshwater input holds true for the Holocene, using a sediment record from the central basin of the Strait of Magellan (core MD07-3132, 53°44.17'S; 70°19.03'W, 301m). Our approach relies on a proxy-based reconstruction of fjord sea surface temperature (alkenone SST), paleosalinity, freshwater input, and paleoproductivity. The results indicate that, during the early Holocene, the accumulation rate (AR) of marine organic carbon was low (<20kgm-2kyr-1), most likely due to high freshwater contribution resulting in low salinity and low SSTs. After 8.5kyr BP and during the mid and late Holocene all the productivity proxies increase. The AR's of marine organic carbon (~30kgm-2kyr-1), biogenic CaCO3 (~60kgm-2kyr-1) and biogenic opal (425kgm-2kyr-1) reached the highest values during the last millennium. This increase was probably driven by the marine transgression where marine macronutrient-rich waters entered into the central basin, while lowered precipitation and decreased meltwater input contributed to increase the basin's SSTs and salinity. The late Holocene rise in productivity was interrupted by a low salinity phase between 3.2 and 2.2kyr BP, during which productivity returned to early Holocene conditions in response to increased input of glacial clays, as suggested by high values of K/Si ratio (~1.2). Our results indicate that meltwater contribution from glaciers plays a crucial role in controlling fjord productivity on seasonal to millennial timescales. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68851
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作者单位: Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Campus Isla Teja, Edificio Emilio Pugin, Valdivia, Chile; Centro COPAS, Universidad de Concepción, Casilla 160-C, Concepción, Chile; Lehrstuhl für Geologie, Fachbereich VI, Geowissenschaften, Universität Trier, Trier, Germany; Dirección de Programas Antáticos y Subantárticos, Universidad de Magallanes, Avenida Bulnes 01855/casilla 113 D, Punta Arenas, Chile; Departamento de Oceanografía, Universidad de Concepción, Casilla 160-C, Concepción, Chile; Renard Centre of Marine Geology, Ghent University, Krijgslaan 281 S8, Gent, Belgium; Alfred Wegener Institut für Polar- und Meeresforschung, Am Alten Hafen 26, Bremerhaven, Germany; Leibniz Institute for Baltic Sea Research Warnemünde, Marine Geology, Seestraße 15, Rostock, Germany; Laboratoire des Sciences du Climat et de l'Environnement/IPSL, UMR 8212 CEA/CNRS/UVSQ, Avenue de la Terrasse, Gif-sur-Yvette Cédex, France

Recommended Citation:
Aracena C.,Kilian R.,Lange C.B.,et al. Holocene variations in productivity associated with changes in glacier activity and freshwater flux in the central basin of the Strait of Magellan[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,436
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