Remote Influence of the Midlatitude South Atlantic Variability in Spring on Antarctic Summer Sea Ice

Zhang, Li; Gan, Bolan; Li, Xichen; Wang, Hong; Wang, Chuan‐Yang; Cai, Wenju; Wu, Lixin

doi:10.1029/2020gl090810

Cited by 9 publications

(8 citation statements)

References 39 publications

(45 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We start by analyzing regressions of various tropical anomalies in May with the normalized MCA1 SST time coefficients at lag −2 months. For the regressions in the following paper, either SST or SIC index can be used, as these two time coefficients represent the synergistic anomalies of SST and SIC (Zhang et al 2018(Zhang et al , 2021.…”

Section: Tropical Convection Over the Atlantic And Pacificmentioning

confidence: 99%

Influence of tropical Atlantic meridional dipole of sea surface temperature anomalies on Antarctic autumn sea ice

Ren

Zhang

Cai

et al. 2022

Environ. Res. Lett.

Self Cite

View full text Add to dashboard Cite

Antarctic sea ice plays an important role in polar ecosystems and global climate, while its variability is affected by many factors. Teleconnections between the tropical and high latitudes have profound impacts on Antarctic climate changes through the stationary Rossby wave mechanism. Recent studies have connected long-term Antarctic sea ice changes to multidecadal variabilities of the tropical ocean, including the Atlantic Multidecadal Oscillation and the Interdecadal Pacific Oscillation. On interannual timescales, whether an impact exists from teleconnection of the tropical Atlantic is not clear. Here we find an impact of sea surface temperature (SST) variability of the tropical Atlantic meridional dipole mode on Antarctic sea ice that is most prominent in austral autumn. The meridional dipole SST anomalies in the tropical Atlantic force deep convection anomalies locally and over the tropical Pacific, generating stationary Rossby wave trains propagating eastward and poleward, which induce atmospheric circulation anomalies affecting sea ice. Specifically, convective anomalies over the equatorial Atlantic and Pacific are opposite-signed, accompanied by anomalous wave sources over the subtropical Southern Hemisphere. The planetary-scale atmospheric response has significant impacts on sea ice concentration anomalies in the Ross Sea, near the Antarctic Peninsula, and east of the Weddell Sea.

show abstract

Section: Tropical Convection Over the Atlantic And Pacificmentioning

confidence: 99%

Influence of tropical Atlantic meridional dipole of sea surface temperature anomalies on Antarctic autumn sea ice

Ren

Zhang

Cai

et al. 2022

Environ. Res. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The sea ice variability is linked to the surface air temperature (Cullather et al., 2016; Yu et al., 2018; Zhang et al., 2021), the moisture flux and total column water vapor (Mortin et al., 2016), which are important contributors to the thermodynamical processes. From day −4 to day 0 of high SIC events (Figures S8a–S8c in Supporting Information ), cold anomalies develop and expand from the eastern Antarctic Peninsula toward the central Weddell Sea accompanied by the equatorward surface wind anomalies (Figures 2e–2g), which is consistent with the strengthening of the positive SIC anomalies there (Figures 1a–1c).…”

Section: Resultsmentioning

confidence: 99%

“…The sea ice concentration variability is directly influenced by the dynamical process such as sea ice drift (Holland, 2014; Holland & Kwok, 2012; Vernet et al., 2019; Zhang et al., 2021). Anomalous sea ice moves northward from southern coast of the Weddell Sea to the northeastern Antarctic Peninsula and the northern Weddell Sea on day −4 of high SIC events (Figure 2a), which leads to the increase of SIC anomalies there (Figures 1a and 1b).…”

Section: Resultsmentioning

confidence: 99%

Intraseasonal Sea Ice Concentration Variability Over the Weddell Sea During Austral Autumn

Song

Chen

et al. 2023

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

The sea ice concentration (SIC) over the Weddell Sea displays obvious intraseasonal variability during austral autumn with a dominant frequency of 5–20 days. The intraseasonal SIC variability is manifested as development of sea ice anomalies from the northeastern Antarctic Peninsula toward the central Weddell Sea. Rossby wave train associated with the internal atmospheric variability featuring circumglobal zonal wavenumber 4 pattern induces the development of anomalous surface winds and sea ice drifting, leading to the SIC anomalies directly. The thermodynamical processes associated with the intraseasonal SIC variability include the air temperature, the moisturizing of the lower troposphere, the latent and sensible heating, and the downwelling longwave radiation, which contribute to the variation of the local greenhouse effect over the Weddell Sea, and thus lead to the sea ice variation. The investigation of the intraseasonal SIC variability helps the understanding of sea‐ice‐atmosphere interaction over the Antarctic region.

show abstract

“…The downward longwave radiation in Antarctica regulates the sea ice variation in relation to the air and skin temperature. Since more downward longwave radiation causes higher skin temperatures and less sea ice, less radiation causes lower skin temperatures and more ice (Lee et al 2017, Sato and Simmonds 2021, Zhang et al 2021. ASL is also associated with the dominant mode of climatic fluctuations, that is, SAM.…”

Section: Monthly Variabilitymentioning

confidence: 99%

Atmospheric precursors to the Antarctic sea ice record low in February 2022

Yadav

Kumar

Mohan

2022

Environ. Res. Commun.

View full text Add to dashboard Cite

Antarctic sea ice expansion and recession are asymmetric in nature, with regional and temporal variations. The decade-long overall increase in the Antarctic sea ice extent (SIE) until 2015 showed a decrease in recent years since satellite records were available. The present study focused on determining the atmospheric forcing and climate fluctuations responsible for the lowest SIE record in February 2022. Here, the lowest SIE record was assumed to result from the sea ice recession that began in September 2021. The SIE reached a record low of 2.16 × 106 km2 in February 2022, which was 43% lower than the mean extent of the previous February months since the satellite era. However, the second-lowest SIE was recorded from November 2021 to January 2022. The Weddell Sea, Ross Sea, and Bellingshausen/Amundsen Seas (ABS) sectors experienced the maximum sea ice change on a regional scale. The record-low SIE occurred when the Amundsen Sea Low (ASL) pressure center was intensified, with the Southern Annular Mode (SAM) at its positive phase. Together, these two climate fluctuations played a role in modifying the pressure and wind patterns in Antarctica. Further, the study investigated the Polar Cap Height (PCH), which demonstrates a strengthening of the stratospheric polar vortex and positive polarity of the SAM. Regions dominated by warm northerly winds produced decreased SIE. However, sea ice increased due to wind-driven sea ice drift towards the north.

show abstract

Remote Influence of the Midlatitude South Atlantic Variability in Spring on Antarctic Summer Sea Ice

Cited by 9 publications

References 39 publications

Influence of tropical Atlantic meridional dipole of sea surface temperature anomalies on Antarctic autumn sea ice

Influence of tropical Atlantic meridional dipole of sea surface temperature anomalies on Antarctic autumn sea ice

Intraseasonal Sea Ice Concentration Variability Over the Weddell Sea During Austral Autumn

Atmospheric precursors to the Antarctic sea ice record low in February 2022

Contact Info

Product

Resources

About