Response of southern troposphere meridional circulation to historical maxima of Antarctic sea ice

QUEIROZ, MICHELLY G.S.; Parise, Cláudia Klose; Pezzi, Luciano Ponzi; Carpenedo, Camila Bertoletti; Vasconcellos, Fernanda Cerqueira; TORRES1, ANA LAURA R.; Câmara, Paulo Eduardo Aguiar Saraiva; Lima, Leonardo Gonçalves de

doi:10.1590/0001-3765202220210795

Cited by 2 publications

(4 citation statements)

References 51 publications

(32 reference statements)

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“…. These patterns align with the typical characteristics of zonal wind in the AAO positive phase and are in line with previous research findings (Azhar et al, 2022;Queiroz et al, 2022). Additionally, the structures of the anomalous zonal averaged winds are corresponding to the local vertical meridional cells.…”

Section: Journal Of Geophysical Research: Atmospheressupporting

confidence: 92%

“…As depicted in Figure 8b, the zonal averaged wind anomalies in vertical direction display a barotropic nature, characterized by an increase in zonal wind near 60°S and a decrease near 35°S. These patterns align with the typical characteristics of zonal wind in the AAO positive phase and are in line with previous research findings (Azhar et al., 2022; Queiroz et al., 2022). Additionally, the structures of the anomalous zonal averaged winds are corresponding to the local vertical meridional cells.…”

Section: Observation Analysissupporting

confidence: 90%

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Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Xiao,

Duan,

et al. 2024

JGR Atmospheres

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Through observational analysis and atmospheric simulation experiments, the relationship between sea ice in the region of South Pole and August precipitation in China was determined. Results indicate that the leading mode of August precipitation in China is significantly correlated with July sea ice concentration (SIC) in South Pole, specifically in eastern Indian Ocean (EIO) region. Typically, the SIC growth is followed by positive rainfall anomalies in the middle and lower reaches of Yangtze River Basin (YRB) and Northeast China (NEC), while South China (SC) is under the control of negative rainfall anomalies. Precisely, owing to the temporal persistence of sea ice in the South Polar region from May to August, sea ice anomalies exert a strong influence on August atmospheric stability in EIO of Southern Hemisphere via regulating turbulent heat flux and air temperature anomalies. As SIC increases, the atmospheric circulation in horizontal exhibits the characteristics of the Antarctic Oscillation (AAO) positive phase, affecting the zonal wind anomalies. Subsequently, the anomalous circulation with a barotropic structure propagates to Australia and the East Asian via the strengthened vertical meridional cells and zonal winds. Moreover, numerical simulations confirm that due to the growth of South Polar sea ice in EIO, abnormal cyclone and anticyclone appear over North China and SC respectively, together with the moisture converging anomalies in the middle and lower reaches of YRB, and diverging anomalies in SC. Accordingly, these atmospheric circulation anomalies triggered by Antarctic sea ice conducive to a wet (dry) August in northern (southern) China.

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Section: Journal Of Geophysical Research: Atmospheressupporting

confidence: 92%

Section: Observation Analysissupporting

confidence: 90%

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Xiao,

Duan,

et al. 2024

JGR Atmospheres

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“…Upward anomalies are displayed between 40° and 30°S and downward at 50°–40°S (Figure 5b), indicating a weakening of the Ferrel cell. Queiroz et al (2022) found similar behaviour of Hadley and Ferrel cells. A maximum southward anomaly over the upper troposphere between 40° and 30°S corroborated the same results (Figure 5a).…”

Section: Resultsmentioning

confidence: 73%

“…According to Ciasto and Thompson (2008), large‐scale atmospheric variability in the Southern Hemisphere is mainly driven by two climate variability modes: the Southern Annular Mode (SAM) and the El Niño–Southern Oscillation (ENSO). On an interannual timescale, the interaction between these modes generates SST anomalies in the South Atlantic Ocean that contribute to the South American climate (Andreoli & Kayano, 2006; Parise et al, 2022; Queiroz et al, 2022; Rudeva & Simmonds, 2015; Silva & Ambrizzi, 2006; Torres et al, 2022; Vasconcellos et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Warming trends of southwestern Atlantic SST and the summer's warmest SST's impact on South American climate

Vasconcellos

Souza

Dereczynski

et al. 2023

Intl Journal of Climatology

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Several atmospheric variables are directly influenced by oceanic conditions, mainly the sea surface temperature (SST). SST trends and variability over the southwestern Atlantic (SWA) have affected the South American climate, principally the monsoonal period (austral summer). This study analysed the SST trends over the SWA for all seasons. In addition, possible large‐scale triggers of the austral summer's warmest SST over the SWA and the straight impacts of these warmest SSTs on the South American climate were investigated. The results showed a significant positive SST trend of approximately 0.02°C·year−1 over the SWA for all seasons. Since 2000, positive SST anomalies have increased in frequency in all seasons, with the seven warmest summers occurring during the 2010s. The highest SST summers over the SWA have been related to four leading causes: (i) planetary waves triggered by warm anomalies over the subtropical South Pacific; (ii) an omega‐type blocking configuration over the South Atlantic; (iii) a Southern Annular Mode positive phase; and (iv) a strengthening of the Hadley Cell, responding to warm SST over tropical North Atlantic. They all reflected on intensification of the South Atlantic Subtropical High and the western boundary current, heating the SWA. The summer's warmest SST led to positive air temperature anomalies extending in almost all of eastern South America, with significantly highest temperatures over southeastern Brazil, northern Argentina and western Paraguay. Clouds decrease strengthen the incident shortwave in southeastern Brazil, warming the region. Significant reduction of cloudiness and precipitation indicate a low performance of the South Atlantic Convergence Zone. The comparison of the warmest summers in 1980s–1990s in the SWA ratified the role of SST intensification. In conclusion, the positive SST trends over the SWA are related to the summer's warmest SST after 2000s, causing heating and dryness in eastern South America, mainly over southeastern Brazil.

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Response of southern troposphere meridional circulation to historical maxima of Antarctic sea ice

Cited by 2 publications

References 51 publications

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Interannual Variability of August Precipitation in China Associated With the Antarctic Sea Ice Anomaly

Warming trends of southwestern Atlantic SST and the summer's warmest SST's impact on South American climate

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