scholarly journals ENSO Warm (El Niño) and Cold (La Niña) Event Life Cycles: Ocean Surface Anomaly Patterns, Their Symmetries, Asymmetries, and Implications

2002 ◽  
Vol 15 (10) ◽  
pp. 1118-1140 ◽  
Author(s):  
Narasimhan K. Larkin ◽  
D. E. Harrison
Keyword(s):  
El Niño ◽  
El Nino ◽  
Ocean Surface ◽  
Life Cycles ◽  
La Niña ◽  
La Nina ◽  
La Nina Event

Inorganic carbon in the central California upwelling system during the 1997–1999 El Niño–La Niña event

2002 ◽  
Vol 54 (1-4) ◽  
pp. 185-203 ◽  
Author(s):  
G.E Friederich ◽  
P.M Walz ◽  
M.G Burczynski ◽  
F.P Chavez
Keyword(s):  
El Niño ◽  
Inorganic Carbon ◽  
El Nino ◽  
La Niña ◽  
Central California ◽  
Upwelling System ◽  
La Nina ◽  
La Nina Event

Changes in the Structure of a Coastal Fish Assemblage Exploited by a Small Scale Gillnet Fishery During an El Niño–La Niña Event

2000 ◽  
Vol 51 (6) ◽  
pp. 773-787 ◽  
Author(s):  
E. Godı́nez-Domı́nguez ◽  
J. Rojo-Vázquez ◽  
V. Galván-Piña ◽  
B. Aguilar-Palomino
Keyword(s):  
El Niño ◽  
Fish Assemblage ◽  
El Nino ◽  
La Niña ◽  
Small Scale ◽  
Coastal Fish ◽  
La Nina ◽  
La Nina Event

scholarly journals ORBITAL AND SURFACE EVAPOTRANSPIRATION COMPARED TO FAO-56 STANDARD IN STATE OF ACRE

Irriga ◽  
2017 ◽  
Vol 22 (3) ◽  
pp. 547-559
Author(s):  
Rafael Coll Delgado ◽  
Leonardo Paula de Souza ◽  
Marcos Gervásio Pereira ◽  
Catherine Torres de Almeida ◽  
Rafael De Ávila Rodrigues
Keyword(s):  
El Niño ◽  
Rio De Janeiro ◽  
El Nino ◽  
Life Cycles ◽  
The State ◽  
La Niña ◽  
Sensor Data ◽  
La Nina ◽  
Surface Data ◽  
Weather Stations

ORBITAL AND SURFACE EVAPOTRANSPIRATION COMPARED TO FAO-56 STANDARD IN STATE OF ACRE  RAFAEL COLL DELGADO1; LEONARDO PAULA DE SOUZA2; MARCOS GERVASIO PEREIRA3; CATHERINE TORRES DE ALMEIDA4 E RAFAEL DE ÁVILA RODRIGUES5 1Universidade Federal Rural do Rio de Janeiro, Professor Doutor do Instituto de Florestas, Departamento de Ciências Ambientais, UFRRJ, CEP 23890-000, Seropédica, RJ, Brasil, [email protected]; 2Universidade Federal do Acre, Professor Doutor do Centro de Ciências Biológicas e da Natureza, UFAC, CEP 69.920-900, Rio Branco, AC, Brasil,  [email protected];   3Universidade Federal Rural do Rio de Janeiro, Professor Doutor do Departamento de Solos, UFRRJ, CEP 23890-000, Seropédica, RJ, Brasil,  [email protected];4Instituto Nacional de Pesquisas Espaciais, Doutoranda em Sensoriamento Remoto, INPE, CEP 65250-000, São José dos Campos, SP, Brasil, [email protected];5Universidade Federal de Goiás, Professor Doutor da Unidade Acadêmica Especial, Instituto de Geografia, UFG, CEP 75704-020, Catalão, GO, Brasil, [email protected].  1 ABSTRACT Evapotranspiration is a critical component of the hydrological and life cycles, with a major impact on water consumption by the population, agricultural activities, and the global climate. This study aims to compare the reference evapotranspiration (ETo) eight different empirical methods with the FAO-56 standard, using orbital and surface data for the years 2003 and 2008 in the State of Acre. For surface data methods, the Irmak-2 and Val-4 showed a higher performance and the Alexandris method showed the worst performance compared with the FAO-56 standard. The spatial distribution of ETo derived of the orbital data method were compared based on the annual mean, presenting lower ETo (2.26 mm d-1) in 2003 and higher average (3.94 mm d-1) in 2008. This interannual variability of ETo may be associated with moderate El Niño events in 2003 and strong La Niña in 2008. The statistical analysis showed satisfactory results of the evapotranspiration mean values for the years 2003 and 2008 obtained by MODIS sensor data, but it is important to have a greater representation of weather stations in the state for future studies. The results serve as a subsidy for water demand estimates of vegetation, as well for biomass productivity and changing landscape studies. Keywords: orbital platforms, water availability, weather stations.  DELGADO, R. C.; SOUZA, L. P.; PEREIRA, M. G.; ALMEIDA, C. T.; RODRIGUES, R. A. EVAPOTRANSPIRAÇÃO ORBITAL E DE SUPERFÍCIE COMPARADOS AO PADRÃO FAO-56 NO ESTADO DO ACRE  2 RESUMO A Evapotranspiração é um componente crítico do ciclo hidrológico e da vida, com grande impacto no consumo de água pela população, em atividades agrícolas e no clima global. O presente trabalho tem por objetivo comparar a evapotranspiração de referência (ETo) a partir de diferentes métodos ao padrão FAO-56, utilizando dados orbitais e de superfície para os anos de 2003 e 2008 no Estado do Acre. Para os dados de superfície, o Irmak-2 e o Val-4 mostraram um maior desempenho e o método proposto por Alexandris o pior desempenho em comparação ao padrão FAO-56. A distribuição espacial dos valores de ETo foi comparada com base nos valores médios anuais, sendo que o período de 2003 apresentou ETo mais baixa (2.26 mm d-1) e o ano de 2008 os valores mais elevados (3.94 mm d-1). Esta variabilidade de ETo pode estar associada aos eventos de El Niño moderado em 2003 e La Niña forte em 2008. A análise estatística apresentou resultados satisfatórios dos valores médios para os anos de 2003 e 2008 de evapotranspiração obtidos pelo sensor MODIS, porém é importante que haja uma maior representativadade das EMS no estado para estudos futuros. Os resultados servem como subsídio para estimativas de demanda hídrica da vegetação, como também para estudos de produtividade de fitomassa e mudança da paisagem. Palavras-Chave: plataformas orbitais, disponibilidade de água, estações meteorológicas.

scholarly journals ENSO in the CMIP5 Simulations: Life Cycles, Diversity, and Responses to Climate Change

2017 ◽  
Vol 30 (2) ◽  
pp. 775-801 ◽  
Author(s):  
Chen Chen ◽  
Mark A. Cane ◽  
Andrew T. Wittenberg ◽  
Dake Chen
Keyword(s):  
El Niño ◽  
Natural Variation ◽  
El Nino ◽  
Phase Locking ◽  
Life Cycles ◽  
La Niña ◽  
First Century ◽  
La Nina ◽  
Twenty First Century ◽  
Projected Changes

Focusing on ENSO seasonal phase locking, diversity in peak location, and propagation direction, as well as the El Niño–La Niña asymmetry in amplitude, duration, and transition, a set of empirical probabilistic diagnostics (EPD) is introduced to investigate how the ENSO behaviors reflected in SST may change in a warming climate. EPD is first applied to estimate the natural variation of ENSO behaviors. In the observations El Niños and La Niñas mainly propagate westward and peak in boreal winter. El Niños occur more at the eastern Pacific whereas La Niñas prefer the central Pacific. In a preindustrial control simulation of the GFDL CM2.1 model, the El Niño–La Niña asymmetry is substantial. La Niña characteristics generally agree with observations but El Niño’s do not, typically propagating eastward and showing no obvious seasonal phase locking. So an alternative approach is using a stochastically forced simulation of a nonlinear data-driven model, which exhibits reasonably realistic ENSO behaviors and natural variation ranges. EPD is then applied to assess the potential changes of ENSO behaviors in the twenty-first century using CMIP5 models. Other than the increasing SST climatology, projected changes in many aspects of ENSO reflected in SST anomalies are heavily model dependent and generally within the range of natural variation. Shifts favoring eastward-propagating El Niño and La Niña are the most robust. Given various model biases for the twentieth century and lack of sufficient model agreements for the twenty-first-century projection, whether the projected changes for ENSO behaviors would actually take place remains largely uncertain.

scholarly journals Impacts of ENSO on Philippine Tropical Cyclone Activity

2016 ◽  
Vol 29 (5) ◽  
pp. 1877-1897 ◽  
Author(s):  
Irenea L. Corporal-Lodangco ◽  
Lance M. Leslie ◽  
Peter J. Lamb
Keyword(s):  
Tropical Cyclone ◽  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
The Philippines ◽  
Life Cycles ◽  
La Niña ◽  
Cyclone Activity ◽  
La Nina ◽  
The Mean

Abstract This study investigates the El Niño–Southern Oscillation (ENSO) contribution to Philippine tropical cyclone (TC) variability, for a range of quarterly TC metrics. Philippine TC activity is found to depend on both ENSO quarter and phase. TC counts during El Niño phases differ significantly from neutral phases in all quarters, whereas neutral and La Niña phases differ only in January–March and July–September. Differences in landfalls between neutral and El Niño phases are significant in January–March and October–December and in January–March for neutral and La Niña phases. El Niño and La Niña landfalls are significantly different in April–June and October–December. Philippine neutral and El Niño TC genesis cover broader longitude–latitude ranges with similar long tracks, originating farther east in the western North Pacific. In El Niño phases, the mean eastward displacement of genesis locations and more recurving TCs reduce Philippine TC frequencies. Proximity of La Niña TC genesis to the Philippines and straight-moving tracks in April–June and October–December increase TC frequencies and landfalls. Neutral and El Niño accumulated cyclone energy (ACE) values are above average, except in April–June of El Niño phases. Above-average quarterly ACE in neutral years is due to increased TC frequencies, days, and intensities, whereas above-average El Niño ACE in July–September is due to increased TC days and intensities. Below-average La Niña ACE results from fewer TCs and shorter life cycles. Longer TC durations produce slightly above-average TC days in July–September El Niño phases. Fewer TCs than neutral years, as well as shorter TC durations, imply less TC days in La Niña phases. However, above-average TC days occur in October–December as a result of higher TC frequencies.

Rapid shift in zooplankton community composition on the northeast Pacific shelf during the 1998–1999 El Niño – La Niña event

2005 ◽  
Vol 62 (1) ◽  
pp. 133-144 ◽  
Author(s):  
Jeannette E Zamon ◽  
David W Welch
Keyword(s):  
El Niño ◽  
El Nino ◽  
California Current ◽  
Zooplankton Community ◽  
Historical Record ◽  
La Niña ◽  
The North ◽  
La Nina ◽  
La Nina Event ◽  
Rapid Shift

The 1997–1998 El Niño was one of the strongest ocean warming events in the historical record followed by an equally strong cold La Niña event in 1999. We observed a rapid shift in the marine zooplankton assemblage found in the transitional area between the California Current domain and the Alaska Gyre domain. Nonmetric multidimensional scaling revealed that the shift in species composition was caused primarily by changes in the relative abundance of subtropical neritic copepods normally found in the California Current domain. In 1998, the subtropical neritic copepods Paracalanus, Ctenocalanus, and Corycaeus were found as far north as 56°N and occurred in 100%, 96%, and 51% of 1998 samples versus 16%, 5%, and 3% of 1999 samples. The type and magnitude of change were similar to those observed off central Oregon but differed from those observed in southeast Alaska. Results support the hypothesis that anomalous poleward transport can inject significant California Current water into the coastal circulation of the Alaska Gyre and suggest that alongshore connectivity between the two domains may extend farther to the north than previously thought.

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