Radar-observed spatial and temporal rainfall variability near the Tapajós-Amazon confluence

Cohen, Julia; Fitzjarrald, David R.; D'Oliveira, Flávio A.F.; Saraiva, Ivan; Barbosa, Illelson Rafael da Silva.; Gandú, Adilson Wagner; Kuhn, Paulo Afonso Fischer

doi:10.1590/0102-778620130058

Cited by 29 publications

(33 citation statements)

References 14 publications

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“…Therefore, this influence becomes much bigger than the oceanic effect on the SB. Other studies have shown the presence of the RB in Amazonian cities (Silva Dias et al , ; Fitzjarrald et al , ; Cohen et al, ; Santos et al , ; Matos and Cohen, ); generally this temperature contrast between the forest and the rivers can reach more than 6 °C (Greco et al , ; Oliveira and Fitzjarrald, ).…”

Section: Resultsmentioning

confidence: 91%

“…The Eastern Amazon ( Figure 1 for the geographical location of the target area in this study) observes a variety of mesoscale convective systems, among which we can highlight mesoscale convective complex (CCMs) and squall lines (SLs) (Kousky, 1980;Maddox, 1980;Cohen et al, 1995;Vitorino et al, 1997;Silva Dias et al, 2004;Lu et al, 2005;Fitzjarrald et al, 2008;Ramos da Silva et al, 2011;Cohen et al, 2014;Matos and Cohen, 2015).…”

Section: Introductionmentioning

confidence: 82%

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Analysis of the breeze circulations in Eastern Amazon: an observational study

Germano

Vitorino

Cohen

et al. 2017

Atmospheric Science Letters

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An observational analysis was conducted in five different cities in Eastern Amazonia, in order to detect the breeze circulations in the region. The frequency of wind direction, wind speed, and precipitation was analyzed along with estimated spatio-temporal rainfall through the Climate Prediction Center Morphing Technique (CMORPH). The results show different types of breezes that occur in these cities, with regular time from 0900-2100 UTC for SB (sea breeze), 0000-0900 UTC for LB (land breeze), and 1200-0000 UTC for RB (river breeze). The SB has been shown to be more frequent from September to November (SON), while the LB is more prominent from March to May (MAM). However, the RB highlights throughout the whole year in Belém. The hour of occurrence of the SB circulation and the precipitation along the coast has shown a relationship.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 82%

Analysis of the breeze circulations in Eastern Amazon: an observational study

Germano

Vitorino

Cohen

et al. 2017

Atmospheric Science Letters

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“…O nordeste paraense tem clima quente e úmido (Peel et al, 2007) e seus níveis de precipitação anual estão entre 2000 e 3000 mm, apresentando duas estações bem definidas: chuvosa, nos meses de Dezembro a Maio e menos chuvosa, de Junho a Novembro (Figueroa e Nobre, 1990). Nesta região a precipitação é originadas através de sistemas convectivos forçados localmente (Silva Dias at al., 2004, Lu et al, 2005, Fitzjarrald et al, 2008, Mesquita e Ramos da Silva, 2012, Cohen et al, 2014, pelas linhas de instabilidade formadas ao longo da costa atlântica (Molion, 1987;Garstang et al, 1994;Cohen et al, 1995, Alcântara et al, 2011 e existem também os sistemas atmosféricos de grande escala tal como a Zona de Convergência Intertropical (ZCIT) que define os períodos chuvoso e menos chuvoso (Ferreira et al, 2015).…”

Section: Introductionunclassified

Circulação De Brisa Fluvial E a Banda De Precipitação Na Margem Leste Da Baía De Marajó

Matos¹,

Cohen²

2016

CeN

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ResumoNa região de Belém, além dos sistemas atmosféricos de grande escala como a ZCIT e de mesoescala como as Linhas de Instabilidade, há também sistemas convectivos forçados localmente que também causam precipitação. Este trabalho estuda um sistema convectivo, observado pela primeira vez nessa região durante a campanha do projeto CHUVA, o qual é denominado por Microlinha de Instabilidade Fluvial(MLF) devido sua formação estar associada a circulação de brisa fluvial. Os dados do satélite GOES 12, radar banda X, anemômetro de hélice, pluviômetros, disdrômetros, reanálises do NCEP foram utilizados para estudar esta MLF. Simulação numérica de alta resolução com o modelo BRAMS foi feita para esta MLF, utilizando-se duas grades com resolução horizontal de 3 Km e 1 Km. Os resultados da simulação mostraram que a MLF foi formada através de brisa fluvial proveniente da baía de Marajó, causando precipitação desde sua fase inicial sobre a região de Belém até quando estava sobre a margem oeste da baía do Marajó. Durante sua propagação para Oeste, observou-se aumento da sua intensidade, que foi máxima sobre a baía de Marajó, onde há intenso transporte de cargas e passageiros e naufrágios são o tipo de acidente mais frequente. Palavras-chave: Microlinha. Refletividade. Brisa fluvial. BRAMS. AbstractThe precipitation in Belem region is mainly due the large atmospheric systems such as ITCZ and mesoscale systems like the Instability Lines. Beside these systems, there are convective systems forced locally which also promote precipitation in this region. This paper studies a convective system, observed for first time during the campaign of the RAIN project, which is called Micro Instability Line Fluvial (MLF) because its formation is associated with river breeze circulation. The GOES 12 satellite data, radar band X, anemometer, rain gauges, disdrometer, and NCEP reanalyzes were used to study this MLF. High-resolution numerical simulation with the BRAMS model was made for this MLF, using two grids with horizontal resolution of 3 km and 1 km. The simulation results showed that the MLF was formed by river breeze from the Marajo Bay, causing precipitation since the early stages in Belem area until this MLF was on the west bank of the Marajo bay. During its propagation westward, this MLF had increased its intensity, which was maximum over the Bay of Marajo, where there is intense transportation of cargo and passengers, and shipwrecks are the most frequent type of accidents.

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“…The main mechanisms responsible for precipitation in the region are the squall lines (e.g. Cohen et al, 2014) and the intertropical convergence zone (ITCZ) (e.g. Hastenrath and Greischar, 1993).…”

Section: Study Areamentioning

confidence: 99%

Effects of the surface heterogeneities on the local climate of a fragmented landscape in Amazonia using a tile approach in the Eta/Noah‐MP model

Pilotto

Chou

Tomasella

et al. 2017

Quart J Royal Meteoro Soc

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This study evaluates the use of tiles to estimate the effects of surface heterogeneities in simulations of local climate in a landscape‐fragmented region of Amazonia. Three experiments using the Eta/Noah‐MP model were designed as follows: two experiments with a spatial resolution of 5 km with and without the use of the tile approach. The third experiment used a finer spatial resolution of 2 km without the use of the tile approach (high‐resolution experiment). Simulations were carried out for the rainy and dry seasons, which correspond to the months of March and September 2003, respectively. In general, the magnitude of surface fluxes is significantly affected by the introduction of tiles. In the dry season, the use of tiles in the simulation increases the magnitude of precipitation (about 7 mm day−1), skin temperature (about 4 °C), sensible heat flux (about 80 W m−2) and surface albedo (about 0.7). It reduces the latent heat flux (about 30 W m−2) and net radiation (about 40 W m−2). On the other hand, in the rainy season, the model produces excessive precipitation. This may have partly masked the signs of the land fragmentation impact. The tile experiment generates a warmer and drier boundary layer during the dry season. The impact of the surface heterogeneity representation is higher in the dry season than in the rainy season. The results suggest that the degree of impact of the subgrid process representation on the local climate is related to the spatial scale of the fragmentation. The use of the tile approach improves the representation of the effects of landscape heterogeneity on the spatial distribution of surface flux variability in fragmented areas. Comparison against measured data from flux towers in the region show that the model can simulate diurnal and seasonal variations in the local fluxes, despite the biases.

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Radar-observed spatial and temporal rainfall variability near the Tapajós-Amazon confluence

Cited by 29 publications

References 14 publications

Analysis of the breeze circulations in Eastern Amazon: an observational study

Analysis of the breeze circulations in Eastern Amazon: an observational study

Circulação De Brisa Fluvial E a Banda De Precipitação Na Margem Leste Da Baía De Marajó

Effects of the surface heterogeneities on the local climate of a fragmented landscape in Amazonia using a tile approach in the Eta/Noah‐MP model

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