Implications of late Eocene to early Miocene clay mineral assemblages in McMurdo Sound (Ross Sea, Antarctica) on paleoclimate and ice dynamics

1998 ◽  
Vol 139 (3-4) ◽  
pp. 213-231 ◽  
Author(s):  
Werner Ehrmann
Keyword(s):  
Clay Mineral ◽  
Ross Sea ◽  
Late Eocene ◽  
Early Miocene ◽  
Ice Dynamics ◽  
Mcmurdo Sound ◽  
Mineral Assemblages

Local climatology of fast ice in McMurdo Sound, Antarctica

2018 ◽  
Vol 30 (2) ◽  
pp. 125-142 ◽  
Author(s):  
Stacy Kim ◽  
Ben Saenz ◽  
Jeff Scanniello ◽  
Kendra Daly ◽  
David Ainley
Keyword(s):  
Sea Ice ◽  
Ross Sea ◽  
Wind Waves ◽  
Marine Ecosystem ◽  
Sea Ice Concentration ◽  
Ice Dynamics ◽  
Mcmurdo Sound ◽  
High Resolution Imagery ◽  
Pack Ice ◽  
Fast Ice

AbstractFast ice plays important physical and ecological roles: as a barrier to wind, waves and radiation, as both barrier and safe resting place for air-breathing animals, and as substrate for microbial communities. While sea ice has been monitored for decades using satellite imagery, high-resolution imagery sufficient to distinguish fast ice from mobile pack ice extends only back to c. 2000. Fast ice trends may differ from previously identified changes in regional sea ice distributions. To investigate effects of climate and human activities on fast ice dynamics in McMurdo Sound, Ross Sea, the sea and fast ice seasonal events (1978–2015), ice thicknesses and temperatures (1986–2014), wind velocities (1973–2015) and dates that an icebreaker annually opens a channel to McMurdo Station (1956–2015) are reported. A significant relationship exists between sea ice concentration and fast ice extent in the Sound. While fast/sea ice retreat dates have not changed, fast/sea ice reaches a minimum later and begins to advance earlier, in partial agreement with changes in Ross Sea regional pack ice dynamics. Fast ice minimum extent within McMurdo Sound is significantly correlated with icebreaker arrival date as well as wind velocity. The potential impacts of changes in fast ice climatology on the local marine ecosystem are discussed.

scholarly journals Magnetostratigraphic Chronology of a Cenozoic Sequence From DSDP Site 274, Ross Sea, Antarctica

2020 ◽  
Vol 8 ◽  
Author(s):  
Luigi Jovane ◽  
Fabio Florindo ◽  
Gary Wilson ◽  
Stephanie de Almeida Pecchiai Saldanha Leone ◽  
Muhammad Bin Hassan ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Ross Sea ◽  
Sediment Accumulation ◽  
Late Eocene ◽  
Early Miocene ◽  
Accumulation Rates ◽  
Age Model ◽  
Circumpolar Current ◽  
Geomagnetic Polarity ◽  
Geomagnetic Polarity Time Scale

New paleomagnetic results from the late Eocene-Middle Miocene samples from Deep Sea Drilling Project Site 274, cored during Leg 28 on the continental rise off Victoria Land, Ross Sea, provide a chronostratigraphic framework for an existing paleoclimate archive during a key period of Antarctic climate and ice sheet evolution. Based on this new age model, the cored late Eocene-Middle Miocene sequence covers an interval of almost 20 Myr (from ∼35 to ∼15 Ma). Biostratigraphic constraints allow a number of possible correlations with the Geomagnetic Polarity Time Scale. Regardless of correlation, average interval sediment accumulation rates above 260 mbsf are ∼6 cm/kyr with the record punctuated by a number of unconformities. Below 260 mbsf (across the Eocene/Oligocene boundary) interval, sedimentation accumulation rates are closer to ∼1 cm/kyr. A major unconformity identified at ∼180 mbsf represents at least 9 Myr accounting for the late Oligocene and Early Miocene and represent non-deposition and/or erosion due to intensification of Antarctic Circumpolar Current activity. Significant fluctuations in grain size and magnetic properties observed above the unconformity at 180 mbsf, in the Early Miocene portion of this sedimentary record, reflect cyclical behavior in glacial advance and retreat from the continent. Similar glacial cyclicity has already been identified in other Miocene sequences recovered in drill cores from the Antarctic margin.

Magnetostratigraphic chronology of a late Eocene to early Miocene glacimarine succession from the Victoria Land Basin, Ross Sea, Antarctica

2005 ◽  
Vol 45 (1-3) ◽  
pp. 207-236 ◽  
Author(s):  
Fabio Florindo ◽  
Gary S. Wilson ◽  
Andrew P. Roberts ◽  
Leonardo Sagnotti ◽  
Kenneth L. Verosub
Keyword(s):  
Ross Sea ◽  
Late Eocene ◽  
Early Miocene ◽  
Victoria Land ◽  
Victoria Land Basin

Influence of Late Holocene climate on Lake Eggers hydrology, McMurdo Sound

2021 ◽  
pp. 1-13
Author(s):  
E.J. Chamberlain ◽  
A.J. Christ ◽  
R.W. Fulweiler
Keyword(s):  
Late Holocene ◽  
Ross Sea ◽  
Regional Climate ◽  
Ice Cores ◽  
Lake Ice ◽  
Mcmurdo Sound ◽  
Ice Accumulation ◽  
History Of ◽  
Ground Penetrating ◽  
Western Ross Sea

Abstract Ice-covered lakes in Antarctica preserve records of regional hydroclimate and harbour extreme ecosystems that may serve as terrestrial analogues for exobiotic environments. Here, we examine the impacts of hydroclimate and landscape on the formation history of Lake Eggers, a small ice-sealed lake, located in the coastal polar desert of McMurdo Sound, Antarctica (78°S). Using ground penetrating radar surveys and three lake ice cores we characterize the ice morphology and chemistry. Lake ice geochemistry indicates that Lake Eggers is fed primarily from local snowmelt that accreted onto the lake surface during runoff events. Radiocarbon ages of ice-encased algae suggest basal ice formed at least 735 ± 20 calibrated years before present (1215 C.E.). Persisting through the Late Holocene, Lake Eggers alternated between periods of ice accumulation and sublimation driven by regional climate variability in the western Ross Sea. For example, particulate organic matter displayed varying δ15N ratios with depth, corresponding to sea ice fluctuations in the western Ross Sea during the Late Holocene. These results suggest a strong climatic control on the hydrologic regime shifts shaping ice formation at Lake Eggers.

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