Holocene diatom flora and stratigraphy from sediment cores of two Antarctic lakes (King George Island)

Schmidt, Roland; Mäusbacher, Roland; Müller, Jens Daniel

doi:10.1007/bf00209300

Cited by 109 publications

(76 citation statements)

References 32 publications

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“…On the west side of the AP, significant glacier thinning and ice margin retreat continued until at least 7-8 cal ka BP . Parts of the coast on King George Island in the South Shetland Islands, were ice-free by ~ 9.5 cal ka BP and some lake basins began to accumulate sediments ~ 9.5-9.0 cal ka BP (Mäusbacher et al, 1989;Schmidt et al, 1990;Hjort et al, 2003;Bentley et al, 2005a), but other areas in the same island chain did not become free of ice until much later in the Holocene. For example, parts of Byers Peninsula on Livingston Island seem to have remained ice-covered until as late as 5-3 cal ka BP (Björck et al, 1996a).…”

Section: After the Optimum (95-45 Cal Ka Bp)mentioning

confidence: 99%

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Mechanisms of Holocene palaeoenvironmental change in the Antarctic Peninsula region

et al. 2009

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The Antarctic Peninsula is one of the three fastest warming regions on Earth. Here we review Holocene proxy records of marine and terrestrial palaeoclimate in the region, and discuss possible forcing mechanisms underlying past change, with a specific focus on past warm periods. Our aim is to critically evaluate the mechanisms by which palaeoclimate changes might have occurred, in order to provide a longer-term context for assessing the drivers of recent warming. Two warm events are well recorded in the Holocene palaeoclimate record, namely the early Holocene warm period, and the `Mid Holocene Hypsithermal' (MHH), whereas there are fewer proxy data for the `Mediaeval Warm Period' (MWP) and the `Recent Rapid Regional' (RRR) warming. We show that the early Holocene warm period and MHH might be explained by relatively abrupt shifts in position of the Southern Westerlies, superimposed on slower solar insolation changes. A key finding of our synthesis is that the marine and terrestrial records in the AP appear to show markedly different behaviour during the MHH. This might be partly explained by contrasts in the seasonal insolation forcing between these records. Circumpolar Deep Water (CDW) has been implicated in several of the prominent changes through the Holocene but there are still differences in interpretation of the proxy record that make its influence difficult to assess. Further work is required to investigate contrasts between marine and terrestrial proxy records, east—west contrasts in palaeoclimate, the history of CDW, to retrieve a long onshore high resolution record of the Holocene, and determine the role of sea ice in driving or modulating palaeoclimate change, along with further efforts to study the proxy record of the RRR and the MWP.

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Section: After the Optimum (95-45 Cal Ka Bp)mentioning

confidence: 99%

“…Islands (Schmidt et al, 1990;Björck et al, 1996a) and James Ross Island (Björck et al, 1996b) to maritime Antarctic islands such as Signy Island (Jones et al, 2000;Hodgson and Convey, 2005) and subantarctic South Georgia (4400-2400 cal yr BP; Rosqvist and Schuber, 2003) (Fig. 2c, e).…”

Section: After the Optimum (95-45 Cal Ka Bp)mentioning

confidence: 99%

Mechanisms of Holocene palaeoenvironmental change in the Antarctic Peninsula region

et al. 2009

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“…Planothidium renei (Lange-Bert. & Rol.Schmidt) Van de Vijver in Van de Vijver et al (2002) has a similar valve outline but differs in having typically only two rows of areolae in both rapheless and raphe valve (Schmidt et al 1990;Oppenheim 1994). Moreover, P. renei has elongated external distal fissures continuing beyond the last stria whereas P. wetzelectorianum sp.…”

Section: Discussionmentioning

confidence: 99%

“…The valves of P. superpapilio sp. nov. have a more lanceolate outline with weakly protracted apices whereas in P. papilio valves usually are elliptic even in the longest valves lacking any protracted apices (Schmidt et al 1990). The raphe valves of P. superpapilio sp.…”

Section: Discussionmentioning

confidence: 99%

Four new monoraphid diatom species (Bacillariophyta, Achnanthaceae) from the Maritime Antarctic Region

Kopalová

Zidarova

Vijver

2016

EJT

396

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“…The sediments from these ice-free areas not only provide good records of the history of regional chemical weathering and environmental variability, but also preserve well global changes of different spatiotemporal scales, and represent ideal proxy materials for studying the palaeoenvironmental evolution of the Antarctic region during the Holocene time period (Ingolfsson et al, 1998). The information recorded in these sediments about palaeoclimate changes and glacier advance and retreat has been extensively studied (e.g., Mäusbacher et al, 1989;Schmidt et al, 1990;Goodwin, 1993;Martinez-Macchiavello et al, 1996;Björck et al, 1996;Hjort et al, 1997;Smith et al, 1999), but comparatively less attention has been given to the palaeoecological processes of Antarctic marine animals, such as seal, penguin, etc. (Baroni et al, 1994;Polito et al, 2002;McDaniel et al, 2002;Emslie et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

A preliminary study of elemental geochemistry and its potential application in Antarctic Seal palaeoecology

et al. 2005

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The elemental geochemical composition of sediments influenced by seal excrements in the Antarctic Fildes Peninsula has been examined in order to establish the source of organic matter, identify potential bio-elements and explore their potential palaeoecological implications. The combination of total organic carbon concentration (TOC), total nitrogen concentration (TN), organic carbon isotope (d 13 C) and atomic C/N ratio shows that the organic matter in the sediments with many seal hairs has a marine origin, predominantly derived from seal excrements. Among the determined element/ oxide concentrations, S, Se, F, Zn, Hg, FeO and P 2 O 5 were found to be remarkably enriched in the sediments influenced by seal excrements with respect to the sediments with few or without seal hairs, and their concentrations displayed strong and positive correlations with organic matter abundance, indicating that they had the same source and transportation mechanism as the in situ organic material. A comparison of these element/oxide concentrations with the seal hair numbers showed that they had similar distribution patterns with depth, and the correlations were positive and statistically significant. Based upon these results, S, Se, F, Zn, Hg, FeO and P 2 O 5 in the seal excrement sediments were identified as potential bio-elements and their concentrations could potentially be used as inorganic geochemical indicators for tracking seal palaeoecological processes in the Antarctic region.

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Holocene diatom flora and stratigraphy from sediment cores of two Antarctic lakes (King George Island)

Cited by 109 publications

References 32 publications

Mechanisms of Holocene palaeoenvironmental change in the Antarctic Peninsula region

Mechanisms of Holocene palaeoenvironmental change in the Antarctic Peninsula region

Four new monoraphid diatom species (Bacillariophyta, Achnanthaceae) from the Maritime Antarctic Region

A preliminary study of elemental geochemistry and its potential application in Antarctic Seal palaeoecology

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