Enhanced E. huxleyi carbonate counterpump as a positive feedback to increase deglacial pCO2sw in the Eastern Equatorial Pacific

2021 ◽  
Vol 260 ◽  
pp. 106921
Author(s):  
Chiara Balestrieri ◽  
Patrizia Ziveri ◽  
Michaël Grelaud ◽  
P. Graham Mortyn ◽  
Claudia Agnini
Keyword(s):  
Positive Feedback ◽  
Equatorial Pacific ◽  
Eastern Equatorial Pacific

The dissolved O2-CO2-13C system in the eastern equatorial pacific

1974 ◽  
Vol 21 (3) ◽  
pp. 211-227 ◽  
Author(s):  
Peter Kroopnick
Keyword(s):  
Equatorial Pacific ◽  
Eastern Equatorial Pacific ◽  
Dissolved O2

Modes of eastern equatorial Pacific thermocline variability: Implications for ENSO dynamics over the last glacial period

2009 ◽  
Vol 24 (3) ◽  
Author(s):  
Guillaume Leduc ◽  
Laurence Vidal ◽  
Olivier Cartapanis ◽  
Edouard Bard
Keyword(s):  
Equatorial Pacific ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Last Glacial ◽  
Eastern Equatorial Pacific ◽  
Enso Dynamics ◽  
The Last Glacial ◽  
Thermocline Variability

Ocean Response to Wind Variations, Warm Water Volume, and Simple Models of ENSO in the Low-Frequency Approximation

2010 ◽  
Vol 23 (14) ◽  
pp. 3855-3873 ◽  
Author(s):  
Alexey V. Fedorov
Keyword(s):  
Low Frequency ◽  
Equatorial Pacific ◽  
Warm Water ◽  
Water Volume ◽  
Thermocline Depth ◽  
Phase Lag ◽  
Eastern Equatorial Pacific ◽  
The Pacific ◽  
Warm Water Volume ◽  
Frequency Approximation

Abstract Physical processes that control ENSO are relatively fast. For instance, it takes only several months for a Kelvin wave to cross the Pacific basin (Tk ≈ 2 months), while Rossby waves travel the same distance in about half a year. Compared to such short time scales, the typical periodicity of El Niño is much longer (T ≈ 2–7 yr). Thus, ENSO is fundamentally a low-frequency phenomenon in the context of these faster processes. Here, the author takes advantage of this fact and uses the smallness of the ratio ɛk = Tk/T to expand solutions of the ocean shallow-water equations into power series (the actual parameter of expansion also includes the oceanic damping rate). Using such an expansion, referred to here as the low-frequency approximation, the author relates thermocline depth anomalies to temperature variations in the eastern equatorial Pacific via an explicit integral operator. This allows a simplified formulation of ENSO dynamics based on an integro-differential equation. Within this formulation, the author shows how the interplay between wind stress curl and oceanic damping rates affects 1) the amplitude and periodicity of El Niño and 2) the phase lag between variations in the equatorial warm water volume and SST in the eastern Pacific. A simple analytical expression is derived for the phase lag. Further, applying the low-frequency approximation to the observed variations in SST, the author computes thermocline depth anomalies in the western and eastern equatorial Pacific to show a good agreement with the observed variations in warm water volume. Ultimately, this approach provides a rigorous framework for deriving other simple models of ENSO (the delayed and recharge oscillators), highlights the limitations of such models, and can be easily used for decadal climate variability in the Pacific.

scholarly journals Permeability versus depth in the upper oceanic crust: In situ measurements in DSDP hole 504B, eastern equatorial Pacific

1985 ◽  
Vol 90 (B5) ◽  
pp. 3659 ◽  
Author(s):  
Roger N. Anderson ◽  
Mark D. Zoback ◽  
Stephen H. Hickman ◽  
Robin L. Newmark
Keyword(s):  
Oceanic Crust ◽  
Equatorial Pacific ◽  
In Situ Measurements ◽  
Eastern Equatorial Pacific

Tectonic processes in Papua New Guinea and past productivity in the eastern equatorial Pacific Ocean

Nature ◽  
10.1038/19281 ◽  
1999 ◽  
Vol 398 (6728) ◽  
pp. 601-604 ◽  
Author(s):  
Mark. L. Wells ◽  
Geoffrey K. Vallis ◽  
Eli A. Silver
Keyword(s):  
Pacific Ocean ◽  
Papua New Guinea ◽  
New Guinea ◽  
Equatorial Pacific ◽  
Equatorial Pacific Ocean ◽  
Tectonic Processes ◽  
Eastern Equatorial Pacific ◽  
Eastern Equatorial Pacific Ocean

The influence of water mass mixing on the dissolved Si isotope composition in the Eastern Equatorial Pacific

2013 ◽  
Vol 380 ◽  
pp. 60-71 ◽  
Author(s):  
Patricia Grasse ◽  
Claudia Ehlert ◽  
Martin Frank
Keyword(s):  
Water Mass ◽  
Isotope Composition ◽  
Equatorial Pacific ◽  
Eastern Equatorial Pacific ◽  
Influence Of Water ◽  
Si Isotope

scholarly journals Equatorial Pacific peak in biological production regulated by nutrient and upwelling during the late Pliocene/early Pleistocene cooling

2013 ◽  
Vol 10 (3) ◽  
pp. 5535-5554
Author(s):  
J. Etourneau ◽  
R. S. Robinson ◽  
P. Martinez ◽  
R. Schneider
Keyword(s):  
Nutrient Supply ◽  
Equatorial Pacific ◽  
Sea Surface ◽  
Early Pleistocene ◽  
High Latitudes ◽  
Export Production ◽  
Eastern Equatorial Pacific ◽  
Nutrient Consumption ◽  
High Nutrient ◽  
High Nutrient Supply

Abstract. The largest increase in export production in the eastern Pacific of the last 5.3 Myr (million years) occurred between 2.2 and 1.6 Myr, a time of major climatic and oceanographic reorganization in the region. Here, we investigate the causes of this event using reconstructions of export production, nutrient supply and oceanic conditions across the Pliocene-Pleistocene in the eastern equatorial Pacific (EEP) for the last 3.2 Myr. Our results indicate that the export production peak corresponds to a cold interval marked by high nutrient supply relative to consumption, as revealed by the low bulk sedimentary 15N/14N (δ15N) and alkenone-derived sea surface temperature (SST) values. This ~ 0.6 million years long episode of enhanced delivery of nutrients to the surface of the EEP was predominantly initiated through the upwelling of nutrient-enriched water sourced in high latitudes. In addition, this phenomenon was likely promoted by the regional intensification of upwelling in response to the development of intense Walker and Hadley atmospheric circulations. Increased nutrient consumption in the polar oceans and enhanced denitrification in the equatorial regions restrained nutrient supply and availability and terminated the high export production event.

Sign in / Sign up

Export Citation Format

Share Document