Consulta: subjectFacets:"El Nino"
Registros recuperados: 10
Data/hora: 01/06/2024 07:24:49

"El nino", benefícios ou prejuízos para a agricultura?
Provedor de dados: 14
Autores: MULLER, A. G.
bitstream/item/75664/1/art-018.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Clima; Meteorologia; El Nino; Climatology; Meteorology.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/658891

Meiofauna and sedimentary organic matter off Central Chile: response to changes caused by the 1997-1998 El Nino
Provedor de dados: 5
Autores: Neira, C; Sellanes, J; Soto, A; Gutierrez, D; Gallardo, Va.
Quantitative surveys of metazoan meiofauna were carried out in an upwelling region off Central Chile (36 degreesS). During May 1997 and May 1998, coinciding with the onset and end of Fl Nino, five benthic stations (respectively 27, 34, 64, 88, and 120 m depth), from the middle of Concepcion Bay to the edge of the adjacent continental shelf, were sampled. The sedimentary organic matter biopolymeric fraction (proteins, carbohydrates and lipids) and chloroplastic pigments were also assessed. Total meiofauna abundance and biomass increased significantly between sampling dates at the mid-bay and inner shelf sites, from 1474 +/- 354 to 5035 +/- 291 individuals 10 cm(-2) and from 2618 +/- 332 to 5241 +/- 903 individuals 10 cm(-2), respectively. The relative...
Tipo: Text
Palavras-chave: Chili central; El Niño; Méiofaune; Matière organique; Thioploca; Central Chile; El Nino; Meiofauna; Organic matter; Thioploca.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43358/42857.pdf

Displacements and transformations of nitrate-rich and nitrate-poor water masses in the tropical Pacific during the 1997 El Nino
Provedor de dados: 5
Autores: Radenac, Marie-helene; Dandonneau, Yves; Blanke, Bruno.
A Lagrangian analysis was applied to the outputs of a coupled physical-biogeochemical model to describe the redistribution of nitrate-rich and nitrate-poor surface water masses in the tropical Pacific throughout the major 1997 El Nino. The same tool was used to analyze the causes of nitrate changes along trajectories and to investigate the consequences of the slow nitrate uptake in the high nutrient low chlorophyll (HNLC) region during the growth phase of the event. Three patterns were identified during the drift of water masses. The first mechanism is well known along the equator: oligotrophic waters from the western Pacific are advected eastward and retain their oligotrophic properties along their drift. The second concerns the persistent upwelling in...
Tipo: Text
Palavras-chave: Lagrangian analysis; El Nino; Tropical Pacific; Nitrate uptake.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-938.pdf

A mid-Holocene transition in the nitrogen dynamics of the western equatorial Pacific: Evidence of a deepening thermocline?
Provedor de dados: 5
Autores: Kienast, M.; Lehmann, M. F.; Timmermann, A.; Galbraith, E.; Bolliet, T.; Holboum, A.; Normandeau, C.; Laj, C.
Sedimentary delta(15)N records from the oligotrophic western equatorial Pacific (WEP) off Mindanao show that late Holocene sedimentary delta(15)N is substantially lower than that of the early Holocene, following a gradual &gt;3 parts per thousand decrease that occurred between 7 and 3 kyrs ago. Analyses of modem day nitrate isotope profiles from the same region indicate the sensitivity of the WEP N pools towards (1) the advection of (15)N-enriched nitrate from the Eastern Equatorial Pacific (EEP) by the North Equatorial Current (NEC) and the Mindanao Current in subsurface waters and, (2) at shallow depths, the input of new and (15)N-depleted nitrate through N, fixation. We suggest that the Holocene decrease in sedimentary delta(15)N reflects a diminished...
Tipo: Text
Palavras-chave: Tropical Pacific; El Nino; Surface temperature; Fresh water; Nitrate; Mindanao; Ocean; Variability; Holocene; Seawater.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00207/31843/30257.pdf

Demographic response of a population of white-chinned petrels Procellaria aequinoctialis to climate and longline fishery bycatch
Provedor de dados: 5
Autores: Barbraud, Christophe; Marteau, Cedric; Ridoux, Vincent; Delord, Karine; Weimerskirch, Henri.
1. Fisheries can affect non-target species through bycatch, and climate change may act simultaneously on their population dynamics. Estimating the relative impact of fisheries and climate on non-target species remains a challenge for many populations because the spatio-temporal distribution of individuals remains poorly known and available demographic information is incomplete. &lt;br&gt;2. We used population survey data, capture-mark-recapture methods, population modelling and the demographic invariant method to investigate the effects of climate and fisheries on the demography of a predator species affected by bycatch. These complementary approaches were used to help account for different sources of uncertainty. &lt;br&gt;3. The white-chinned petrel...
Tipo: Text
Palavras-chave: Survival; Demographic invariants; El Nino; Longline fishing; Population model; Procellaria aequinoctialis; Recruitment.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00000/11048/11321.pdf

EL NINO/SOUTHERN OSCILLATION EFFECTS ON FARMLAND VALUES IN THE UNITED STATES
Provedor de dados: 31
Autores: Dadakas,   Dimitrios; Jakus,   Paul M.
This paper evaluates the impact of the El Nino/Southern Oscillation (ENSO) on U.S. farmland values.  Fourier series analysis decomposes climatological variation into ENSO and non-ENSO components.  Farmland values, regressed against ENSO variation and other variables, are negatively affected by ENSO related weather variability in about 90% of U.S. climatological regions.
Tipo: Conference Paper or Presentation
Palavras-chave: El Nino; Farmland Value; Ricardian Rent Theory; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/21572

El Nino, Ice Storms, and the Market for Residential Fuelwood in Eastern Canada and the Northeastern U.S.
Provedor de dados: 31
Autores: Jagger,   Pamela; White,   William; Sedjo,   Roger A.
Extreme weather events such as the ice storm that affected eastern Canada and the Northeastern US in January of 1998 have significant impacts on both human populations and forests. One of the questions currently facing climate scientists is whether or not better forecasting of such events would lessen the economic impacts borne by households, industry, agricultural producers and the public sector when such weather events occur. This case study examines the economic impacts of the ice storm on the residential market for fuelwood. It is hypothesized that demand for fuelwood will increase due to the failure of non-wood heating sources during the ice storm. In addition, damage to trees in the region should increase the supply of fuelwood; the net effect of...
Tipo: Working or Discussion Paper
Palavras-chave: Fuelwood; El Nino; Ice storm; Forest management; Extreme weather event; Climate forecasting; Forest policy; Resource /Energy Economics and Policy; D1; D13; Q2; Q21; Q23; Q42.
Ano: 1999
URL: http://purl.umn.edu/10535

The Impact of El Nino on Northeastern Forests: A Case Study on Maple Syrup Production
Provedor de dados: 31
Autores: Bergeron,   Nancy; Sedjo,   Roger A.
El Nino events are likely to affect maple syrup production since it is very sensitive to weather patterns. A statistically significant direct correlation has not been found in our preliminary analysis, however. This may be because many other factors affect production and because weather anomalies also occur in non-El Nino years. Few defensive activities are available to maple syrup producers to alleviate the negative impacts of weather anomalies on their production. Hence, the value of El Nino-Southern Oscillation (ENSO) forecasts to them is likely to be low, even if a clear correlation between productivity and ENSO events was eventually found. Overall, small welfare impacts of El Nino weather events are expected from their impact on the maple syrup...
Tipo: Working or Discussion Paper
Palavras-chave: El Nino; Forests; Maple syrup; Economic welfare effects; Dieback; Resource /Energy Economics and Policy; D61; Q10; Q20; Q23; N5.
Ano: 1999
URL: http://purl.umn.edu/10671

Peasant Households Strategies in the Andes and Potential Users of Climate Forecasts: El Nino of 1997-1998
Provedor de dados: 31
Autores: Valdivia,   Corinne; Jette,   Christian; Quiroz,   Roberto; Gilles,   Jere L.; Materer,   Susan M.
Production strategies pursued by households and individuals in a peasant community of the Bolivian Altiplano are shaped by access to resources, social networks and institutions, wealth, and the ability to develop urban rural linkages. In times of climatic stress such as the low rainfall of 1995, the household economic portfolio shifts to activities less vulnerable to climate. The ability to shift is conditioned by access to resources, social capital, stage in the life cycle and wealth. Atypology developed to understand how strategies take shape during a drought is used to evaluate access to information during el Nino (1997-98) and impacts on potato production in 1998-99. The relationship between diversification and use of climate forecasts (local and...
Tipo: Working or Discussion Paper
Palavras-chave: Climate Variability; El Nino; Coping Strategies; Rural Livelihoods; Climate Forecasts; Consumer/Household Economics; Environmental Economics and Policy.
Ano: 2002
URL: http://purl.umn.edu/92895

Climatic characteristics of the 2010-2016 drought in the semiarid Northeast Brazil region
Provedor de dados: 42
Autores: MARENGO,JOSÉ A.; ALVES,LINCOLN M.; ALVALA,REGINA C.S; CUNHA,ANA PAULA; BRITO,SHEILA; MORAES,OSVALDO L.L.
ABSTRACT This study discusses the climatological aspects of the most severe drought ever recorded in the semiarid region Northeast Brazil. Droughts are recurrent in the region and while El Nino has driven some of these events others are more dependent on the tropical North Atlantic sea surface temperature fields. The drought affecting this region during the last 5 years shows an intensity and impact not seen in several decades in the regional economy and society. The analysis of this event using drought indicators as well as meteorological fields shows that since the middle 1990s to 2016, 16 out of 25 years experienced rainfall below normal. This suggests that the recent drought may have in fact started in the middle-late 1990s, with the intense droughts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought; Northeast Brazil; Rainfall; Water deficit; El Nino; Vulnerability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501973