Reciclagem De Precipitação Na Amazônia: Um Estudo De Revisão

Rocha, Vinícius Machado; Correia, Francis Wagner Silva; Fonseca, Paula Andrea Morelli

doi:10.1590/0102-778620140049

Cited by 29 publications

(20 citation statements)

References 38 publications

(50 reference statements)

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“…Transpiration (T ) of Amazon forests is an important source of water to the atmosphere [7][8][9][10]. A significant proportion of precipitation falling in the Amazon is recycled through forest transpiration forming a humid air mass that provides an important source of precipitation for large areas of South America [11,12]. Extreme drought events that cause large-scale tree mortality can disrupt this precipitation recycling process [8,12].…”

Section: Introductionmentioning

confidence: 99%

ENSO effects on the transpiration of eastern Amazon trees

Brum

Lopez

Asbjornsen

et al. 2018

Phil. Trans. R. Soc. B

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Tree transpiration is important in the recycling of precipitation in the Amazon and might be negatively affected by El Niño–Southern Oscillation (ENSO)–induced droughts. To investigate the relative importance of soil moisture deficits versus increasing atmospheric demand (VPD) and determine if these drivers exert different controls over tree transpiration during the wet season versus the dry season (DS), we conducted sap flow measurements in a primary lowland tropical forest in eastern Amazon during the most extreme ENSO-induced drought (2015/2016) recorded in the Amazon. We also assessed whether trees occupying different canopy strata contribute equally to the overall stand transpiration ( T stand ). Canopy trees were the primary source of T stand . However, subcanopy trees are still important as they transpired an amount similar to other biomes around the globe. Tree water use was higher during the DS, indicating that during extreme drought trees did not reduce transpiration in response to low soil moisture. Photosynthetically active radiation and VPD exerted an overriding effect on water use patterns relative to soil moisture during extreme drought, indicating that light and atmospheric constraints play a critical role in controlling ecosystem fluxes of water. Our study highlights the importance of canopy and subcanopy trees to the regional water balance and highlights the resilience to droughts that these trees show during an extreme ENSO event. This article is part of a discussion meeting issue ‘The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications’.

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Section: Introductionmentioning

confidence: 99%

ENSO effects on the transpiration of eastern Amazon trees

Brum

Lopez

Asbjornsen

et al. 2018

Phil. Trans. R. Soc. B

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“…Over the continent, however, MCS areas vary considerably between seasons. Additionally, over Colombia the largest MCS areas occurred during MAM-JJA, with an average size of 21 442 km 2 , while the smallest MCS areas occurred during DJF, with an average size of 18 218 km 2 ; over the Amazon Basin regions, the largest MCS areas occurred during DJF, with an average size of 27 017 km 2 , while the smallest MCS areas occurred during JJA, with an average size of 16 976 km 2 , suggesting that MCS areas over the continent are strongly related to seasonal migration of the more direct solar radiation as well as land-surface-atmospheric feedbacks associated with an increase (decrease) in soil moisture, actual evapotranspiration, and precipitation recycling (Poveda and Mesa, 1997;Zemp et al, 2014;Rocha et al, 2015). Previous studies have shown that MCS areas are larger over the oceans (Nesbitt et al, 2000;Zuluaga and Houze, 2015).…”

Section: Areamentioning

confidence: 99%

Mesoscale convective systems and other precipitation features over the tropical Americas and surrounding seas as seen byTRMM

Jaramillo

Poveda

Mejía

2017

Intl Journal of Climatology

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We classified and characterized precipitation features (PFs) at annual and diurnal timescales during 1998–2011 over the tropical Americas and adjoining oceans using data from two instruments on board the Tropical Rainfall Measuring Mission (TRMM). Our scope included geographic distribution, frequency, area, rainfall rate, and polarization‐corrected temperatures (PCTs) of PFs in an effort to contrast different regions over Colombia, the Amazon River Basin, and the adjoining oceanic regions (Pacific Ocean and Caribbean Sea). Our results showed that mesoscale convective systems (MCSs) over the Caribbean Sea exhibited colder minimum PCTs than Pacific Ocean MCSs. Pacific Ocean MCSs had higher rainfall rates, however, than Caribbean Sea MCSs. Despite the fact that MCSs represented <1% of the total precipitation systems found, the MCSs contributed more rainfall over the study regions. Over the Pacific Ocean, for example, MCSs contributed approximately 57% of the total rainfall contributed by all precipitation systems identified over that region. Additionally, MCSs over the Pacific coast have their maximum frequency during the morning hours (0000–0600 Local Time) offshore and centred over the Pacific Ocean at 77.5°W. The annual cycle of PFs showed a marked bimodal annual cycle over Colombia, whereas over the Amazon Basin, Pacific Ocean, and Caribbean Sea, PFs were characterized by a unimodal annual cycle.

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“…Such lead is evidenced on EVP for 3 to 6 months-lags, on T2m at 2 months-lag, and leading PRC with one month lag. This latter conclusion is at the root of the important role of precipitation recycling in the Amazon River basin [35].…”

Section: Discussionmentioning

confidence: 87%

<strong>New insights on land surface-atmosphere feedbacks over tropical South America at interannual timescales</strong>

Bedoya-Soto

Poveda

2017

Proceedings of First International Electronic Conference on the Hydrological Cycle

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Abstract:Using monthly data for the period 1979-2010, we study the dynamics and strength of land surface-atmosphere feedbacks (LAFs) among variables involved in the heat and moisture fluxes, at interannual timescales in Tropical South America (TropSA). The variables include precipitation, surface air temperature, specific humidity at 925 hPa, evaporation, and estimates of volumetric soil water content. We use a Maximum Covariance Analysis (MCA) to reduce the dimensionality and to rank the relative contributions to LAFs and group the time series into Maximum Covariance States (MCS) with common mechanisms among variables. We estimate linear (Pearson correlations) and non-linear association (information transfer or causality) metrics among pairs of variables to configure the structure of linkages. The main MCS associated with LAFs over TropSA are strongly influenced by ENSO, and the meridional and equatorial SSTs modes over the Atlantic and Indian Oceans. ENSO favors a unimodal behavior, with center of action in the Amazon River basin, while the SSTs mode over the Tropical North Atlantic (TNA) results in a dipole between northern and southern TropSA. Our results show that soil moisture plays a leading role in regulating heat and water anomalies, and provides the memory of the LAFs and their subsequent influence. Thus, volumetric soil water becomes a fundamental variable leading up to 9 month-lags. ENSO enhances the interannual connectivity and memory inside LAF mechanisms with respect to other modes. Within the identified multivariate structure, evaporation and soil moisture enhance the interannual connectivity of the whole set of variables since both variables exhibit more frequent two-way feedbacks with the remaining variables.

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Reciclagem De Precipitação Na Amazônia: Um Estudo De Revisão

Cited by 29 publications

References 38 publications

ENSO effects on the transpiration of eastern Amazon trees

ENSO effects on the transpiration of eastern Amazon trees

Mesoscale convective systems and other precipitation features over the tropical Americas and surrounding seas as seen byTRMM

<strong>New insights on land surface-atmosphere feedbacks over tropical South America at interannual timescales</strong>

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