ENSO Modulates Summer and Autumn Sea Ice Variability Around Dronning Maud Land, Antarctica

Isaacs, Florence; Renwick, James; Mackintosh, Andrew; Dadić, Ruzica

doi:10.26686/wgtn.14143904.v1

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…This gradient in melt days across the region likely indicates differing climate regimes across the region. For example, sea ice concentrations in western but not eastern Dronning Maud Land are strongly controlled by the Weddell Sea (Isaacs and others, 2021). In Amery and Wilkes Land the largest ice shelves, namely the Amery, West and Shackleton shelves, all have relatively high mean annual melt days with individual pixels exceeding 78 annual melt days.…”

Section: Resultsmentioning

confidence: 99%

Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data

2021

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Passive microwave satellite observations are used to identify the presence of surface meltwater across Antarctica at daily intervals from July 1979 to June 2020, with a focus on ice shelves. Antarctic Peninsula ice shelves have the highest number of annual days of melt, with a maximum of 89 days. Over the entire time period, there are few significant linear trends in days of melt per year. High melt years can be split into two distinct categories, those with high melt days in Dronning Maud Land and Wilkes Land, and those with high melt days in the Antarctic Peninsula and the Bellingshausen Sea sector of West Antarctica. The first pattern coincides with significant negative correlations between melt days and spring and summer Southern Annular Mode. Both patterns also form the primary modes of spatial and annual variability in the dataset observed by Principal Component Analysis. Areas experiencing extended melt for the first time in years tend to show large decreases in subsequent winter microwave emissions due to structural changes in the firn. We use this to identify the impact of novel melt events, particularly over the austral summers of 1991/92 and 2015/16 on the Ross Ice Shelf.

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Section: Resultsmentioning

confidence: 99%

Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data

2021

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“…Wind‐driven changes in sea ice advection are the dominant driver of sea ice variability around much of West Antarctica, whereas wind‐driven thermodynamic changes dominate elsewhere (Holland & Kwok, 2012). The PC2 correlated with Z500 geopotential height shows SAM like pattern (Isaacs et al., 2021); positive correlation over the Weddell Sea sector (high‐pressure field) and negative over WIOS region (low‐pressure field) (Figure 7a). This indicates that sea ice variability in the WIOS is influenced by the climatic factors modulated by SAM.…”

Section: Resultsmentioning

confidence: 91%

“…A recent study of sea ice concentration around the DML region observed a strong correlation with the sea surface temperature (SST) anomalies in the tropical Pacific and attributed it to an atmospheric wave train pattern extending from the South Pacific (Isaacs et al., 2021). Such a southward‐propagating atmospheric wave train could alter sea ice concentration by enhancing the meridional airflow.…”

Section: Resultsmentioning

confidence: 99%

Sea Ice Variability and Trends in the Western Indian Ocean Sector of Antarctica During the Past Two Centuries and Its Response to Climatic Modes

et al. 2021

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Antarctic sea ice is a critical component of the ocean‐climate system. Sea ice concentration (SIC) records of various oceanic sectors of Antarctica available since 1979 reveal dramatic changes in recent years; however, there is no consensus yet on drivers of sea ice variability, changes and their future projections. The lack of long‐term SIC records has impeded the quantification of sea ice variability, trends and various forcing factors and mechanisms. Here, we present a long‐term SIC record (1809−1993 CE) for the Western Indian Ocean Sector (WIOS) of Antarctica derived from a new ice core oxygen isotope (δ18O) record together with three available records from Dronning Maud Land (DML), East Antarctica. This long‐term SIC record at annual resolution reveals a significant decline during 1830–1884 CE with a rate of 0.58% ± 0.12% decade−1 followed by moderate increase during 1927–1993 CE with a rate of 0.24% ± 0.11% decade−1. Current satellite‐derived SIC records reveal an increase of 2.59 ± 0.86% decade−1 during 1994–2014 CE, which is unprecedented over the last two centuries as determined by the ice core‐derived SIC record. The satellite and ice core combined SIC record (1809−2019 CE) also reveals a significant increase in interannual variability at El Niño Southern Oscillation band and decadal variability at 16–32 years band in the last few decades. Our investigation suggests that wind‐driven sea‐ice dynamics associated with switching phases of Southern Annular Mode and remote teleconnections of Pacific oscillations largely control the interannual to decadal sea ice variability in this region.

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ENSO Modulates Summer and Autumn Sea Ice Variability Around Dronning Maud Land, Antarctica

Abstract: No description supplied

Cited by 2 publications

References 10 publications

Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data

Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data

Sea Ice Variability and Trends in the Western Indian Ocean Sector of Antarctica During the Past Two Centuries and Its Response to Climatic Modes

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