Moisture and heat budgets of the south American monsoon system: climatological aspects

Garcia, Sâmia Regina; Kayano, Mary Toshie; Calheiros, Alan James Peixoto; Andreoli, Rita V.; Souza, Rodrigo Augusto Ferreira de

doi:10.1007/s00704-016-1882-y

Cited by 5 publications

(5 citation statements)

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“…O ciclo anual climatológico de precipitação em MG é bem definido, com inverno seco (Figuras 2a-2c) e verão chuvoso (Figuras 2g-2i), consistente à climatologia de precipitação do estado mostrada por Silva e Reboita (2014) e Reboita et al (2015),com períodos de transição na primavera e no outono (Figuras 2d-2l). Esses resultados são característicos do Sistema de Monção da América do Sul (SMAS) (RAO et al, 1996;ZHOU;LAU, 1998;GARCIA, 2016;GARCIA et al, 2016a;2016b).O ciclo sazonal da precipitação do SMAS tem início na Amazônia equatorial, propaga-se rapidamente para leste e sudeste no final de setembro e início de outubro, gerando uma estação úmida com chuvas abundantes na Bacia Amazônica. Na fase madura do SMAS (final de novembro até final de fevereiro), essa atividade convectiva da região amazônica estende a precipitação sobre o sudeste do Brasil e o oceano Atlântico adjacente, caracterizando uma banda de nebulosidade, a Zona de Convergência do Atlântico Sul (KODAMA, 1993).…”

Section: 1análise Climatológicaunclassified

“…Na fase madura do SMAS (final de novembro até final de fevereiro), essa atividade convectiva da região amazônica estende a precipitação sobre o sudeste do Brasil e o oceano Atlântico adjacente, caracterizando uma banda de nebulosidade, a Zona de Convergência do Atlântico Sul (KODAMA, 1993). Na fase de dissipação do SMAS (que inicia-se aproximadamente em março), as áreas de precipitação intensa sobre a Amazônia diminuem e migram gradualmente para noroeste na direção do equador (RAO et al, 1996;ZHOU;LAU, 1998;GARCIA et al, 2016a;2016b).…”

Section: 1análise Climatológicaunclassified

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ASPECTOS CLIMATOLÓGICOS ASSOCIADOS AO CULTIVO DA OLIVEIRA (Olea europaea L.) EM MINAS GERAIS

Garcia

Santos

Martins

et al. 2018

ABClima

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No intuito de suprir as necessidades do consumo interno de azeite e azeitona, muitos produtores no Brasil, mais especificamente no sul de Minas Gerais, têm investido nesse cultivo. Entretanto, para viabilizar a expansão da olivicultura é necessário conhecer as condições climáticas limitantes ao seu cultivo, principalmente em relação a eventos extremos de temperatura e precipitação; que são os maiores limitantes à olivicultura. Por isso, o objetivo deste estudo é determinar as áreas climatologicamente aptas ao cultivo da oliveira, em Minas Gerais. Para isso, foram calculadas as climatologias mensais de precipitação e das temperaturas média, máxima e mínima do ar; para o período de 1981 a 2010, em 49 estações meteorológicas de Minas Gerais. Também foram calculados os percentis para determinação de eventos extremos de precipitação (P5 e P95), temperatura máxima (T90) e mínima (T10); além de contabilizar o número de casos com temperatura inferior a 9,5°C e superior a 30°C. Por fim, foi analisado a relação da quantidade dos eventos extremos com as fases fenológicas da oliveira. Os eventos de temperatura inferior a 9,5°C, ocorrem com maior frequência (≥1500 eventos) na região sul do estado. Com relação a eventos de temperatura superior a 30°C, há um maior número de casos (≥1000 eventos) no noroeste, norte, Vales do Jequitinhonha e Mucuri, Central e Triângulo Mineiro. Já a precipitação não inviabiliza o cultivo de oliveira em Minas Gerais, principalmente pela possibilidade de irrigação suplementar nas regiões com maiores registros de P5 e pelo pequeno número de casos (≤ 24 eventos) de P95. Somente as regiões sul e pequena parte do centro-oeste de Minas Gerais possuem características climáticas favoráveis ao cultivo de oliveira

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Section: 1análise Climatológicaunclassified

ASPECTOS CLIMATOLÓGICOS ASSOCIADOS AO CULTIVO DA OLIVEIRA (Olea europaea L.) EM MINAS GERAIS

Garcia

Santos

Martins

et al. 2018

ABClima

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“…Thus, the variability presented by paleoclimatic records in the SAMS region demonstrates greater spatial and temporal heterogeneity due to humidity conditions and variations in the monsoon system itself (Bernal et The regional role of the local moisture conditions is also observed in the recent historical period. For example, Garcia e Kayano (2015) and later Garcia et al (2017) demonstrated that during the period from 1958 to 2014, the subareas within the SAMS region showed differences in heat and water balances during the year. In particular, the authors studied the CAM and CWB regions, indicating that the CAM region acts predominantly as a source of moisture and heat during all months of the year, regardless of the PDO phase.…”

Section: The Monsoon For the Last 21000 Years -Trace-21k Full Forcingmentioning

confidence: 99%

Changes in the South American Monsoon System since the Last Glacial Maximum

Custódio

Dias

Wainer

et al. 2022

Preprint

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The main objective of this study is to investigate the spatial-temporal variability and the climate forcing influence during the last 21,000 years of the South American Monsoon System (SAMS). TraCE-21k simulations Full and Single Forcings experiments were used. The identification of spatial variability patterns associated to the core of monsoon region and the South Atlantic Convergence Zone (SACZ) patterns are based on multivariate EOF analysis (precipitation, humidity, zonal and meridional wind) which produces two main modes: the South American Large Scale Monsoon Index (LISAM) and the SACZ mode. The LISAM and SACZ modes show that the TraCE-21k represents the SAMS and SACZ patterns and the comparison to the 20th Century reanalysis EOF analysis show significant agreement. LISAM time series proved to be an important instrument to identify monsoon precipitation variability, consistent with the regime changes registered in climatic proxies. The freshwater pulses forcing in TraCE-21k is a determining factor for the observed changes in the precipitation regime, mainly for the periods between the Heinrich Stadial 1 and the Younger Dryas. The results show that the observed and modeled SACZ southward shift in the Late Holocene is mainly modulated by insolation changes, with stronger correlation observed since the Mid-Holocene period. Through wavelet analysis, it was noted that energy was transferred from low frequencies to high frequencies during Bolling Allerod for the full forcing and freshwater pulse experiments in the Northern Hemisphere, with the SAMS multidecadal variability increasing from the early Holocene with direct influences of orbital forcing and ice cover.

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“…Although the South American monsoon system (SAMS) does not present typical monsoon wind direction reversion, as in the eastern Asia and Indian monsoon systems, its large‐scale atmospheric circulation patterns feature monsoon characteristics (Zhou and Lau, 1998). Also, a large continental portion presents a rainfall regime with a rainy summer and a dry winter that resembles the monsoon rainfall regime (Rao et al ., 1996; Zhou and Lau, 1998; Marengo et al ., 2001; Gan et al ., 2004; Liebmann et al ., 2007; Garcia and Kayano, 2009; 2011; 2013; 2015; Garcia et al ., 2016; 2017). Thus, studies on the onset and demise rainy season (ONR and DER, respectively) dates in the SAMS region might bring relevant results with socioeconomic implications to the population in tropical South America, because many economic sectors (energy generation, agriculture) depend on this information.…”

Section: Introductionmentioning

confidence: 99%

Onset and demise dates of the rainy season in the South American monsoon region: A cluster analysis result

Rodrigues

Garcia

Kayano

et al. 2021

Intl Journal of Climatology

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This work proposes an adaptation of the method developed in previous papers to determine the onset and demise of the rainy season (ONR and DER) dates in the areas of the South American monsoon system (SAMS) based on the pentad antisymmetric outgoing long‐wave radiation (AOLR). In those papers, the sign change of the mean AOLR in the central Amazon Basin (CAM) and western central Brazil (WCB) from positive to negative defined the ONR, from negative to positive, the DER dates. Since the monsoon convection presents a northwest–southeast oriented progression, the antisymmetric area to the WCB was selected subjectively. Thus, here we propose to use the Ward hierarchical clustering method to select areas in the SAMS and in the northern tropical America (NTA) for the regionalized AOLR calculation. The significant (at the 95% confidence level) negative correlations with the largest magnitude among the clusters in the SAMS and NTA and the outgoing long‐wave radiation (OLR) and precipitation annual cycles in each group define the pairs to calculate the AOLR. Then, the AOLR time series is calculated and subjected to a 5‐pentad running mean filter. This method keeps the climatological features of the convection annual cycle such that the closer (farther) the pair is to the equator the longer (shorter) the rainy season. The ONR and DER dates found with this new method are remarkably close to those found previously. Therefore, the new method proposed here highlights regional aspects of rainy season and can easily be automatized for its routine application at the operational climate monitoring centres, for instance at INPE. This is the most important advantage of the method and might be relevant to the SAMS rainy season monitoring.

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Moisture and heat budgets of the south American monsoon system: climatological aspects

Cited by 5 publications

References 38 publications

ASPECTOS CLIMATOLÓGICOS ASSOCIADOS AO CULTIVO DA OLIVEIRA (Olea europaea L.) EM MINAS GERAIS

ASPECTOS CLIMATOLÓGICOS ASSOCIADOS AO CULTIVO DA OLIVEIRA (Olea europaea L.) EM MINAS GERAIS

Changes in the South American Monsoon System since the Last Glacial Maximum

Onset and demise dates of the rainy season in the South American monsoon region: A cluster analysis result

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