Conditions leading to the unprecedented low Antarctic sea ice extent during the 2016 austral spring season

2017 ◽  
Vol 44 (17) ◽  
pp. 9008-9019 ◽  
Author(s):  
Malte F. Stuecker ◽  
Cecilia M. Bitz ◽  
Kyle C. Armour
Keyword(s):  
Sea Ice ◽  
Spring Season ◽  
Austral Spring ◽  
Sea Ice Extent ◽  
Antarctic Sea Ice

scholarly journals Brief communication: Changing mid-twentieth century Antarctic sea ice variability linked to tropical forcing

2017 ◽  
Author(s):  
Chris S.~M. Turney ◽  
Andrew Klekociuk ◽  
Christopher J. Fogwill ◽  
Violette Zunz ◽  
Hugues Goosse ◽  
...  
Keyword(s):  
Sea Ice ◽  
Ocean Circulation ◽  
System Modelling ◽  
Austral Spring ◽  
Sea Ice Extent ◽  
Tropical Forcing ◽  
Proxy Records ◽  
Antarctic Sea Ice ◽  
Ice Retreat ◽  
Ice Production

Abstract. Satellite observations demonstrate Antarctic sea ice extent increased between late-1978 and 2015, with significant spatial and seasonal variability. Late spring retreat off George V Land is a major component of the observed increase, but the paucity of proxy records makes interpretation of trends (and impacts) challenging. Here Earth-system modelling and reanalysis demonstrate tropical Pacific warming can trigger an atmospheric Rossby wave response during the austral spring, delaying sea-ice retreat off George V Land. Our results provide new insights into the spatial and temporal role low latitudes play in Antarctic sea-ice production, drift and ocean circulation on decadal to centennial timescales.

Multi-decadal trends in Antarctic sea-ice extent driven by ENSO–SAM over the last 2,000 years

2021 ◽  
Vol 14 (3) ◽  
pp. 156-160
Author(s):  
Xavier Crosta ◽  
Johan Etourneau ◽  
Lisa C. Orme ◽  
Quentin Dalaiden ◽  
Philippine Campagne ◽  
...  
Keyword(s):  
Sea Ice ◽  
Sea Ice Extent ◽  
Antarctic Sea Ice

Connecting Antarctic Sea Ice and Mid-latitude Precipitation

2021 ◽  
Author(s):  
Tristan Rendfrey ◽  
Ashley Payne
Keyword(s):  
Sea Ice ◽  
Southern Hemisphere ◽  
Reanalysis Data ◽  
Lower Latitude ◽  
Sea Ice Extent ◽  
Weather Patterns ◽  
Antarctic Sea Ice ◽  
Ice Coverage ◽  
Precipitation Timing ◽  
Analogous Relation

<div><span>Climatic changes induce many significant changes to long standing weather patterns. These mechanisms interact to drive consequences that may not be immediately obvious. One such connection involves the apparent relationship between polar sea ice extent and mid-latitude precipitation timing and location. This correlation, its mechanisms, and possible influences on weather are decently understood with respect to the Northern Hemisphere. However, the analogous relation for the Southern Hemisphere has been less studied. This provides an opportunity to examine connections between polar conditions and mid-latitude weather.</span></div><div> </div><div><span>We explore the teleconnection between sea ice extent and lower latitude precipitation over the Southern Hemisphere. We investigate this relationship through observations of sea ice coverage using ICESat and ICESat-2 compared with reanalysis data via MERRA-2 in order to understand the variability of sea ice extent and its impact on midlatitude precipitation over the Southern Hemisphere. This study particularly examines the importance of seasonality and regional variations of the relationship.</span></div>

scholarly journals Decadal decrease of Antarctic sea ice extent inferred from whaling records revisited on the basis of historical and modern sea ice records

2003 ◽  
Vol 22 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Stephen Ackley ◽  
Peter Wadhams ◽  
Josefino C. Comiso ◽  
Anthony P. Worby
Keyword(s):  
Sea Ice ◽  
Sea Ice Extent ◽  
Antarctic Sea Ice

scholarly journals Brief communication: lack of agreement in remote sensing detection of cyclonic drift caused by Atlantic weather in Antarctic sea ice

2021 ◽  
Author(s):  
Wayne de Jager ◽  
Marcello Vichi
Keyword(s):  
Remote Sensing ◽  
Sea Ice ◽  
Alternative Methods ◽  
Polar Regions ◽  
Sea Ice Concentration ◽  
Sea Ice Extent ◽  
Ice Dynamics ◽  
Antarctic Sea Ice ◽  
Ice Drift ◽  
The Impact

Abstract. Sea-ice extent variability, a measure based on satellite-derived sea ice concentration measurements, has traditionally been used as an essential climate variable to evaluate the impact of climate change on polar regions. However, concentration- based measurements of ice variability do not allow to discriminate the relative contributions made by thermodynamic and dynamic processes, prompting the need to use sea-ice drift products and develop alternative methods to quantify changes in sea ice dynamics that would indicate trends in Antarctic ice characteristics. Here, we present a new method to automate the detection of rotational drift features in Antarctic sea ice at daily timescales using currently available remote sensing ice motion products from EUMETSAT OSI SAF. Results show that there is a large discrepancy in the detection of cyclonic drift features between products, both in terms of intensity and year-to-year distributions, thus diminishing the confidence at which ice drift variability can be further analysed. Product comparisons showed that there was good agreement in detecting anticyclonic drift, and cyclonic drift features were measured to be 1.5–2.2 times more intense than anticyclonic features. The most intense features were detected by the merged product, suggesting that the processing chain used for this product could be injecting additional rotational momentum into the resultant drift vectors. We conclude that it is therefore necessary to better understand why the products lack agreement before further trend analysis of these drift features and their climatic significance can be assessed.

Last Glacial Maximum Antarctic sea ice linked with global mean ocean temperature: evidence from PMIP3, PMIP4 and MIROC-4m simulations

2021 ◽  
Author(s):  
Tristan Vadsaria ◽  
Sam Sherriff-Tadano ◽  
Ayako Abe-Ouchi ◽  
Takashi Obase ◽  
Wing-Le Chan ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Sea Ice ◽  
Last Glacial Maximum ◽  
Ocean Circulation ◽  
Glacial Maximum ◽  
Ocean Temperature ◽  
Sea Ice Extent ◽  
Last Glacial ◽  
Antarctic Sea Ice ◽  
The Antarctic

<p>Southern Ocean sea ice and oceanic fronts are known to play an important role on the climate system, carbon cycles, bottom ocean circulation, and Antarctic ice sheet. However, many models of the previous Past-climate Model Intercomparison Project (PMIP) underestimated sea-ice extent (SIE) for the Last Glacial Maximum (LGM)(Roche et al., 2012; Marzocchi and Jensen, 2017), mainly because of surface bias (Flato et al., 2013) that may have an impact on mean ocean temperature (MOT). Indeed, recent studies further suggest an important link between Southern Ocean sea ice and mean ocean temperature (Ferrari et al., 2014; Bereiter et al., 2018 among others). Misrepresent the Antarctic sea-ice extent could highly impact deep ocean circulation, the heat transport and thus the MOT. In this study, we will stress the relationship between the distribution of Antarctic sea-ice extent and the MOT through the analysis of the PMIP3 and PMIP4 exercise and by using a set of MIROC models. To date, the latest version of MIROC improve its representation of the LGM Antarctic sea-ice extent, affecting the deep circulation and the MOT distribution (Sherriff-Tadano et al., under review).</p><p>Our results show that available PMIP4 models have an overall improvement in term of LGM sea-ice extent compared to PMIP3, associated to colder deep and bottom ocean temperature. Focusing on MIROC (4m) models, we show that models accounting for Southern Ocean sea-surface temperature (SST) bias correction reproduce an Antarctic sea-ice extent, 2D-distribution, and seasonal amplitude in good agreement with proxy-based data. Finally, using PMIP-MIROC analyze, we show that it exists a relationship between the maximum SIE and the MOT, modulated by the Antarctic intermediate and bottom waters.</p>

scholarly journals Annually-Averaged Polar Sea-Ice Extents During 1978–1987: Northern Extent Decrease and Southern Extent Oscillation

1990 ◽  
Vol 14 ◽  
pp. 336
Author(s):  
Per Gloersen ◽  
William J. Campbell
Keyword(s):  
Sea Ice ◽  
Goodness Of Fit ◽  
El Nino ◽  
Microwave Radiometer ◽  
Small Oscillation ◽  
The Arctic ◽  
Sea Ice Extent ◽  
Antarctic Sea Ice ◽  
El Niño Events ◽  
El Nino Events

Recently reported observations of a nine-year decrease in global sea-ice extent, obtained from the Scanning Multichannel Microwave Radiometer onboard the Nimbus-7 satellite during 1978–87 and averaged with an annual running mean, have been separated into Arctic and Antarctic components. The annually-averaged global extent decrease was 2.5%. Here it is shown that the greater part of this decrease occurred in the Arctic where there was a decline of 3.5% with a goodness of fit of 0.54. Superimposed on this decline was a small oscillation with a period of about four years and an amplitude of about 1%. A significantly smaller and statistically insignificant decrease of 1.2% with a goodness of fit of 0.03 is observed in the annually averaged Antarctic sea-ice extent. However, three large oscillations with amplitudes of about 4% and periods of about three years occurred in phase with three El Niño events.

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