1997-98 El Niño effects on the pelagic ecosystem of the California current off Baja California, Mexico

Lavaniegos, Bertha E.; Gaxiola‐Castro, Gilberto; Jiménez-Pérez, L.C.; González-Esparza, María R.; Baumgartner, Tim R.; Garcia-Cordova, Joaquin

doi:10.22201/igeof.00167169p.2003.42.3.939

Cited by 18 publications

(1 citation statement)

References 12 publications

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“…Other effects of these events include biogeochemical and ecological changes including reductions in nutrients and biological production (Bograd and Lynn, 2001;Chavez et al, 2002;Deutsch et al, 2021), redistribution and disappearance of species from their typical habitat (Chavez, 2002), and changes in dissolved oxygen and pH at the surface levels (Turi et al, 2018). In particular, the 1997-98 El Niño event -the focus of this paper -was responsible for important effects on the pelagic ecosystem off Baja California (BC) peninsula (Kahru and Mitchell, 2000;Reyes Bonilla, 2001;Lavaniegos et al, 2003). Given its environmental importance at different spatial scales, the dynamics and predictability of El Niño phenomenon have been previously studied (e.g.…”

Section: Introductionmentioning

confidence: 98%

On dynamical downscaling of ENSO-induced oceanic anomalies off Baja California Peninsula, Mexico: role of the air-sea heat flux

2023

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The El Niño Southern Oscillation (ENSO) phenomenon is responsible for important physical and biogeochemical anomalies in the Northeastern Pacific Ocean. The event of 1997-98 has been one of the most intense in the last decades and it had large implications for the waters off Baja California (BC) Peninsula with a pronounced warm sea surface temperature (SST) anomaly adjacent to the coast. Downscaling of reanalysis products was carried out using a mesoscale-resolving numerical ocean model to reproduce the regional SST anomalies. The nested model has a 9 km horizontal resolution that extend from Cabo Corrientes to Point Conception. A downscaling experiment that computes surface fluxes online with bulk formulae achieves a better representation of the event than a version with prescribed surface fluxes. The nested system improves the representation of the large scale warming and the localized SST anomaly adjacent to BC Peninsula compared to the reanalysis product. A sensitivity analysis shows that air temperature and to a lesser extent wind stress anomalies are the primary drivers of the formation of BC temperature anomaly. The warm air-temperature anomalies advect from the near-equatorial regions and the central north Pacific and is associated with sea-level pressure anomalies in the synoptic-scale atmospheric circulation. This regional warm pool has a pronounced signature on sea level anomaly in agreement with observations, which may have implications for biogeochemistry.

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Section: Introductionmentioning

confidence: 98%

On dynamical downscaling of ENSO-induced oceanic anomalies off Baja California Peninsula, Mexico: role of the air-sea heat flux

2023

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The influence of El Ninñ 1997–98 on pelagic ostracods in the Humboldt Current Ecosystem off Peru

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The influence of El Niño 1997–98 on pelagic ostracods in the Humboldt Current Ecosystem off Peru

2007

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Planktonic ostracods are deep dwelling mesozooplankton that are diel migrators and detritus feeders. In the Humboldt Current region off Peru they are shown to be strongly influenced by El Niñ o conditions. Species composition and distribution were compared in day and night (vertically hauled 50-0 m Hensen Net) samples that were collected from three latitudinal zones (3°40' S-6°S; 9°S-12°S and 15°S-18°S) during 1998 (El Niñ o year) and in 2001 (a year with usual upwelling regime). Unexpectedly, ostracods diversity and abundance were much higher during El Niñ o than during the upwelling regime. Tropical species that normally occurred north of 6°S, spread southwards and increased in abundance; Euconchoecia aculeata was often dominant, particularly in coastal waters, and the frequency of occurrence of others increased throughout the entire region (e.g. Porroecia porrecta, Archiconchoecia striata). Conversely, Conchoecetta giesbrechti, a species associated with subsurface oxygen minimum waters, was more frequently found and in higher abundance during the upwelling regime in 2001. Thus, El Niñ o conditions apparently favor the occupation of the epipelagic zone by many halocyprid species advected in from tropical waters, possibly because the higher oxygen content in the subsurface waters enables these diel migrating species to survive better. Additional factors may be a consequence of the switch to a picoplankton production cycle, which results in more detritus being retained in the upper waters, and the sharp reduction in planktivorous fishes such as the anchovy which may reduce the predation pressure they experience.

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1997-98 El Niño effects on the pelagic ecosystem of the California current off Baja California, Mexico

Cited by 18 publications

References 12 publications

On dynamical downscaling of ENSO-induced oceanic anomalies off Baja California Peninsula, Mexico: role of the air-sea heat flux

On dynamical downscaling of ENSO-induced oceanic anomalies off Baja California Peninsula, Mexico: role of the air-sea heat flux

The influence of El Ninñ 1997–98 on pelagic ostracods in the Humboldt Current Ecosystem off Peru

The influence of El Niño 1997–98 on pelagic ostracods in the Humboldt Current Ecosystem off Peru

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