A Influência da Circulação de Revolvimento Meridional do Atlântico na Definição da Posição Média da ZCIT ao Norte do Equador. Uma Revisão

Aímola, Luis; Moura, Maurício do Nascimento

doi:10.1590/0102-7786312314b20150059

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Climatology of annual variation of precipitation in Quelimane (Figure 3) showed 1951-1975, 1951-2016, and 1980-2016. that there were two distinct seasons of precipitation, the wet season extending from December to April and the dry season extending between May and November. The highest precipitation amounts were observed in summer, in response to the southern migration of the Inter-Tropical Convergence Zone dur-Journal of Geoscience and Environment Protection ing the austral summer months as reported Aimola & Moura (2016). Overall, El Niño (La Niña) years tend to be associated to drier (wetter) conditions in response to a high (low) pressure center which dominates the southern Africa during warm (cold) phases of ENSO, repressing (enhancing) convection and rainfall (Nicholson & Kim, 1997;Reason & Jagadheesha, 2005).…”

Section: Discussionsupporting

confidence: 57%

Variability and Trends of Precipitation in Quelimane, Central Mozambique, and Their Relation to El Niño Southern Oscillation

Silva¹,

Oliveira²,

Almeida³

2020

GEP

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Understanding precipitation variability and trends is very important for sustainable water management. In this paper, we used 65 years longterm precipitation data to evaluate the precipitation variability and trends in Quelimane, and their relation to El Niño Southern Oscillation (ENSO). The analysis includes annual, inter-annual inter-decadal variations, Mann-Kendall trend test, and drought frequency. The study also evaluated the relationship between Oceanic Niño Index (ONI) and precipitation patterns during ENSO positive, normal and negative phases. The results show two distinct seasons of precipitation in Quelimane, the wet season extending between December and April and the dry season extending from May to November. ENSO was found to influence the inter-annual variations of precipitation during the wet season, with warm ENSO (El Niño) and cold (La Niña) events tending to reduce and increase the precipitation amounts, respectively. Decreasing trends in inter-annual variations of precipitation and increase of drought frequency and severity are highlighted in this study. Both decreasing trend of inter-annual variations and increasing of drought frequency and severity have intensified after the 1970s climate shift. These intensifications seem to be associated with the strengthening of ENSO after the 1970s climate shift. The results of the present study may be useful for the design of the climate change adaptation plans in central Mozambique.

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Section: Discussionsupporting

confidence: 57%

Variability and Trends of Precipitation in Quelimane, Central Mozambique, and Their Relation to El Niño Southern Oscillation

Silva¹,

Oliveira²,

Almeida³

2020

GEP

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“…Os resultados mostram que nas regiões equatorial e subtropical do Pacífico e Atlântico, as TSM mostram-se ligeiramente mais baixas no IH em comparação com o PI. As TSMs mais baixas durante o IH podem ser explicadas pela atuação da corrente superficial, que se desprende da CCA e flui em direção a linha do Equador (Aimola & Moura, 2016). O fluxo extra de água doce favorece a redução de salinidade e a intensificação do transporte do sal para as camadas mais profundas, o que acarreta na redução da TSM no IH modificado, bem…”

Section: Conclusõesunclassified

Early Holocene and Pre-Industrial Numerical Climate Simulations with Freshwater Addition in the Weddell and Ross Seas

2020

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ResumoO período inicial do Holoceno (IH) é caracterizado pela transição das condições glaciais para interglaciais, no qual algumas regiões do globo experimentaram uma abrupta variação climática a cerca de 11000 anos (11 ka) antes do período atual. Neste trabalho é realizada a comparação do clima durante o IH (~11 ka -com e sem adição de água doce) e o período pré-industrial (PI), a partir de simulações obtidas do modelo acoplado oceano-atmosfera SPEEDY/HYCOM e de uma versão modificada para representar o fluxo de água doce nos mares de Weddell e Ross (SPEEDY/HYCOM/ MODF). A adição de água doce, durante 1500 anos (11 ka -9,5 ka), nos mares de Weddell e Ross durante o IH, favorece uma redução de salinidade em resposta a diminuição da Temperatura da Superfície do Mar (TSM) global. A comparação entre o IH (com adição de água doce) e o PI mostra um arrefecimento da temperatura do ar a 2 metros de altura (T2m) continental, enquanto que a comparação entre o IH (sem adição de água doce) e o PI mostra que a T2m continental fica próxima daquela observada no PI. Finalmente, é evidente a grande extensão de cobertura de gelo marinho (GM) no IH em comparação com a cobertura de GM do PI. Palavras-chave: Variabilidade climática; modelagem climática; cobertura de gelo marinho

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“…The Intertropical Convergence Zone (ITCZ) is a large-scale atmospheric system originating from the ascending branch of the Hadley cell [1] . It manifests near the equator in various atmospheric fields as a band of trade wind convergence, minimum in atmospheric pressure, minimum in outgoing longwave radiation (OLR), deep convective clouds, and frequent intermittent rain events that transfer freshwater from the atmosphere to the ocean [2][3][4][5][6][7][8][9][10][11] . These characteristics do not necessarily occur simultaneously and/ or in the same location [7,12] .…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Intertropical Convergence Zone over the Atlantic Ocean through an Algorithm Based on Precipitation

Chrysostomo de Oliveira Nogueira,

Gomes Machado,

Simões Reboita

et al. 2024

j. of atmos. sci. res.

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The Intertropical Convergence Zone (ITCZ) is a key atmospheric system on a global scale, primarily driven by trade wind convergence near the equator. The ITCZ plays a crucial role in modulating the climate of the borders of tropical continental areas. For instance, Northeastern Brazil experiences a climate influenced by the ITCZ over the Atlantic Ocean. In some periods, the ITCZ exhibits double bands, known as the double ITCZ. While the features of the ITCZ have been described using various approaches and atmospheric variables, there is still a lack of regional studies focusing on the ITCZ and double ITCZ in the Atlantic Ocean. In this context, the main goals of this study are (1) to describe a simple algorithm based on precipitation to identify the ITCZ and double ITCZ, (2) to present a climatology (1997–2022) of the position, width, and intensity of these two convective bands, and (3) to investigate variabilities in the ITCZ characteristics associated with anomalies of sea surface temperature (SST) in the tropical Pacific and Atlantic oceans. The double ITCZ typically occurs southward of the main cloud band, and between February and April, both bands are more distant (~4.5°). In the western sector of the Atlantic Ocean, the ITCZ and its double band extend to more southerly latitudes in austral autumn. Considering the entire Atlantic basin, the annual mean of the latitudinal position, width, and intensity of the ITCZ is 4.9°N, 4.2°, and 11 mm/day, respectively, while for the double ITCZ, it is 0.4°N, 2.6°, 10.3 mm/day, respectively. While the SST anomalies in the Pacific Ocean (El Niño and La Niña episodes) affect more the ITCZ width, the SST anomalies in the Tropical South Atlantic affect both its position and width.

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A Influência da Circulação de Revolvimento Meridional do Atlântico na Definição da Posição Média da ZCIT ao Norte do Equador. Uma Revisão

Cited by 5 publications

References 28 publications

Variability and Trends of Precipitation in Quelimane, Central Mozambique, and Their Relation to El Niño Southern Oscillation

Variability and Trends of Precipitation in Quelimane, Central Mozambique, and Their Relation to El Niño Southern Oscillation

Early Holocene and Pre-Industrial Numerical Climate Simulations with Freshwater Addition in the Weddell and Ross Seas

Assessment of the Intertropical Convergence Zone over the Atlantic Ocean through an Algorithm Based on Precipitation

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A Influência da Circulação de Revolvimento Meridional do Atlântico na Definição da Posição Média da ZCIT ao Norte do Equador. Uma Revisão

Cited by 5 publications

References 28 publications

Variability and Trends of Precipitation in Quelimane, Central Mozambique, and Their Relation to El Ni&#241;o Southern Oscillation

Variability and Trends of Precipitation in Quelimane, Central Mozambique, and Their Relation to El Ni&#241;o Southern Oscillation

Early Holocene and Pre-Industrial Numerical Climate Simulations with Freshwater Addition in the Weddell and Ross Seas

Assessment of the Intertropical Convergence Zone over the Atlantic Ocean through an Algorithm Based on Precipitation

Contact Info

Product

Resources

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Variability and Trends of Precipitation in Quelimane, Central Mozambique, and Their Relation to El Niño Southern Oscillation

Variability and Trends of Precipitation in Quelimane, Central Mozambique, and Their Relation to El Niño Southern Oscillation