Antarctic atmospheric circulation anomalies and explosive cyclogenesis in the spring of 2016

Schossler, Venisse; Aquino, Francisco Eliseu; Reis, Pedro Amaral; Simões, Jefferson Cárdia

doi:10.1007/s00704-020-03200-9

Cited by 7 publications

(5 citation statements)

References 40 publications

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“…In addition, the combination of geological, morphological, oceanographic and climatic factors that act on passive margins of southeast Africa contribute to the occurrence of one of the largest coastal cordons in the world, reaching about ~150 m in height (Armitage et al, 2006; Gomes et al, 2017; Miguel & Castro, 2018; Miguel et al, 2019). The occurrence of these coastal ridges highlights the similar climatic interactions identified by Schossler et al (2020) and Dillenburg et al (2017). The similarities presented result from the persistent action of climatic and oceanographic conditions defined in the south intertropical convergence zone associated with the sediment supply, the existence of accommodation or storage spaces, and the low slope of the continental shelf on the passive margins.…”

Section: Introductionsupporting

confidence: 82%

“…The successive changes in geological, climatic and oceanographic conditions (e.g., relative sea‐level changes, sedimentary dynamics and oceanographic conditions) appear to be occurred and preserved in ~15% of Holocene coastal barrier systems around the world (Glaeser, 1978) including those found along the southeast coast of Africa (Miguel & Castro, 2018), Australia (Dillenburg et al, 2020) and Southern America (Barboza, Dillenburg, do Nascimento Ritter, et al, 2021; Barboza, Dillenburg, Lopes, et al, 2021). During the late Holocene, such systems may sometimes present coastal sedimentary progradation of up to ~30 km, denoting a pronounced action of climatic variability and extreme or gradual changes in oceanographic conditions defined in the southern intertropical convergence zone, which have a very clear global signal (Schossler et al, 2020). Some of these global signals are found along the southern coast of Mozambique (Armitage et al, 2006; Miguel et al, 2019) and in Lake Saint Lucia in South Africa (Gomes et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Late Holocene evolution of a coastal barrier system at Bilene, Mozambique

Miguel,

Costa

2023

Earth Surf Processes Landf

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This research attempts to provide a contribution to the study on coastal barrier‐lagoons in the SE Africa generated by sea‐level fluctuations, and climate change during the Late Holocene. To achieve this goal, the grain‐size analysis and morphoscopic description helped to detect cyclic facie sequences with sediments sized over 200 μm mixed with silt, bioclasts and organic matter. Moreover, the magnetic susceptibility and X‐ray diffraction (XRD) analyses displayed over 90% of quartz and isolated mica, feldspar and heavy minerals. Additionally, the X‐ray fluorescence (XRF) results display the interplay between terrigenous (>Ti and Al) and marine influence (S, Cl and ~Ca) over the last ~3,500 cal. yrs. BP. The geochemical tracer fluctuations detected suggest five distinct deposits including beach, washover, lacustrine system, aeolian deflation that rest on top of the Pleistocene palaeodunes, which are tentatively associated with the sea‐level variations, extreme marine events or with local floods. Although the multiproxy data record refers to a study in Bilene‐Mozambique, it is interesting to understand the mechanisms and variables related to the evolutionary dynamics of coastal barrier lagoons generated by sea‐level fluctuations and climate change, especially in the SE Africa.

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Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Late Holocene evolution of a coastal barrier system at Bilene, Mozambique

Miguel,

Costa

2023

Earth Surf Processes Landf

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“…Regardless of cyclone region, we find that storm center MSLPs range from 975 to 990 hPa at Genesis and decrease through Day 1 (Table 1). We define ETC intensification between Antarctic regional storm clusters using the normalized cyclone deepening metric (Equation 2 in Schossler et al., 2020) and compare average deepening rates between ETC locations using one‐way ANOVA statistics with a 95% confidence interval. We find that E. Weddell ETCs deepen significantly more than Bellingshausen and Ross composite storms.…”

Section: Resultsmentioning

confidence: 99%

Present‐Day Regional Antarctic Sea Ice Response to Extratropical Cyclones

Ward,

Payne,

Pettersen

2023

JGR Atmospheres

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Both atmospheric warming and poleward moisture transport increase the likelihood of sea ice surface melt. In the Southern Hemisphere, short‐lived extratropical cyclones (ETCs) are responsible for a bulk of total heat and moisture transport toward high latitudes. Although these storms form ubiquitously in the midlatitudes, moisture availability and temperature characteristics vary by source region. In this study, we assess atmospheric, oceanic, and sea ice concentration (SIC) anomalies associated with austral winter ETCs over different Antarctic regions using ERA5 reanalysis data. Between 1990 and 2019, we find a total of 514 ETCs, with greater storm frequency in the eastern hemisphere groups. Compared to the climatology, sea ice melts (grows) behind the warm (cold) front of each system and is negatively correlated with atmospheric poleward moisture transport, temperature, meridional winds, and sea surface temperature for all ETCs. We find that Bellingshausen storms move moisture and warm air furthest poleward over their lifespan. However, East Weddell and East Antarctic ETCs are responsible for greater absolute poleward moisture transport than Bellingshausen and Ross systems. More intense ETCs correspond to greater SIC through Day 1, suggesting that SIC impacts ETC strength, regardless of ETC region. From cyclogenesis to cyclolysis, sea ice extent declines underneath composite ETCs, trends are generally not significant. Overall, while sea ice response produced by ETC‐induced atmospheric and oceanic changes varies regionally, the long‐term impacts of ETCs on regional sea ice are negligible over the study period.

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“…ZWN3, with lower amplitude than ZWN1, can also affect the blocking events (Trenberth & Mo, 1985), Amunsen Sea Low (Baines & Fraedrich, 1989;Turner et al, 2013), and sea ice extent (Raphael, 2004(Raphael, , 2007. In particular, the sea ice loss in 2016 is attributed to the strong ZWN3 pattern (Schossler et al, 2020;Wang et al, 2019). These ZWN1 and ZWN3 create asymmetry in the middle latitudes of the SH (Raphael, 2004).…”

mentioning

confidence: 99%

Springtime Southern Hemisphere Quasi‐Stationary Planetary Wave Activities Associated With ENSO/IOD

Kim,

Song,

Chun

et al. 2024

JGR Atmospheres

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The tropical climate variabilities, such as Indian Ocean Dipole (IOD) and El Niño Southern Oscillation (ENSO), are accompanied by changes in the tropical deep convection which can influence the atmospheric circulation in the Southern Hemisphere (SH). To investigate each role of IOD and ENSO in the September‐November (SON) circulation, we examine teleconnection patterns associated with IOD and ENSO events using the ERA5 monthly averaged data from 1979 to 2020. Our approach is to calculate the power spectral density (PSD) of the sea level pressure (SLP) and meridional wind and geopotential height at 300 hPa that are decomposed by zonal wave numbers (ZWNs), and to compute their correlations with IOD and ENSO at each latitudinal band. The main results are that IOD (ENSO) is negatively (positively) correlated with PSDs of ZWN2 and ZWN3 (ZWN1) at 300 hPa in the SH middle latitudes. Considering the Rossby wave train, IOD (ENSO) considerably affects the variability of the ZWN3 (ZWN1) pattern, which influences the meridional exchange of momentum. Additionally, the relationship between IOD and ZWN3 has become tighter in recent years, which is not seen in that with ENSO. The IOD and ENSO events also modify the SLP patterns and meridional surface winds, modulating the sea ice extent in the Southern Ocean. During the highly positive 2019 IOD event, the variability of the middle latitudes atmospheric circulation was considerably larger than climatology, suggesting a higher chance of more extreme weather patterns associated with more frequent intense IOD events in the warming climate.

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Antarctic atmospheric circulation anomalies and explosive cyclogenesis in the spring of 2016

Cited by 7 publications

References 40 publications

Late Holocene evolution of a coastal barrier system at Bilene, Mozambique

Late Holocene evolution of a coastal barrier system at Bilene, Mozambique

Present‐Day Regional Antarctic Sea Ice Response to Extratropical Cyclones

Springtime Southern Hemisphere Quasi‐Stationary Planetary Wave Activities Associated With ENSO/IOD

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