Strengthening western equatorial Pacific and Maritime Continent atmospheric convection and its modulation on the trade wind during spring of 1901–2010

Abstract. It is well known that El Niño Southern Oscillation (ENSO) causes floods, droughts and the collapse of fisheries, therefore forecasting of ENSO is an important task in climate researches. Variations in the equatorial warm water volume of the tropical Pacific and wind variability in the western equatorial Pacific has been considered to be a good ENSO predictor. However, in the 2000s, the interrelationship between these two characteristics and ENSO onsets became weak. This article attempts to find some plausible explanation for this. The results presented here demonstrate a possible link between the variability of atmospheric conditions over the Southern Ocean and their impact on the ocean circulation leading to the amplifying/triggering of ENSO events. It is shown that the variability of the atmospheric conditions upstream of Drake Passage can strongly influence ENSO events. The interrelationship between ENSO and variability in the equatorial warm water volume of the equatorial Pacific, together with wind variability in the western equatorial Pacific has recently weakened. It can be explained by the fact that the process occurred in the Southern Ocean recently became a major contributor amplifying ENSO events (in comparison with the processes of interaction between the atmosphere and the ocean in the tropics of the Pacific). Likely it is due to a warmer ocean state observed from the end of the 1990s that led to smaller atmospheric variability in the tropics and insignificant their changes in the Southern Ocean.

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Sound Velocity, Elastic Constants, and Related Properties of Marine Sediments in the Western Equatorial Pacific: Leg 7, Glomar Challenger

10.2973/dsdp.proc.7.125.1971 ◽

1971 ◽

Author(s):

E.L. Gealy

Keyword(s):

Sound Velocity ◽

Marine Sediments ◽

Elastic Constants ◽

Equatorial Pacific ◽

Western Equatorial Pacific

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Estimation method for vertical distribution of phytoplankton using monitoring data at the western equatorial Pacific Ocean

OCEANS 2006 - Asia Pacific ◽

10.1109/oceansap.2006.4393921 ◽

2006 ◽

Author(s):

N. Nakatani ◽

M. Yabu ◽

T. Okuno

Keyword(s):

Pacific Ocean ◽

Vertical Distribution ◽

Estimation Method ◽

Equatorial Pacific ◽

Monitoring Data ◽

Equatorial Pacific Ocean ◽

Western Equatorial Pacific

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Late Neogene–Quaternary Planktic Foraminiferal Biostratigraphy and Biochronology from ODP Site 807A, Ontong Java Plateau, Western Equatorial Pacific

The Journal of Foraminiferal Research ◽

10.2113/gsjfr.50.2.111 ◽

2020 ◽

Vol 50 (2) ◽

pp. 111-127

Author(s):

Tushar Kaushik ◽

Ashutosh Kumar Singh ◽

Devesh Kumar Sinha

Keyword(s):

Equatorial Pacific ◽

Ocean Drilling Program ◽

Ontong Java Plateau ◽

Faunal Turnover ◽

Ocean Drilling ◽

Late Neogene ◽

Western Equatorial Pacific ◽

Globorotalia Truncatulinoides ◽

Oceanographic Conditions ◽

Foraminiferal Biostratigraphy

ABSTRACT A biostratigraphic and biochronological study from the late Neogene–Quaternary section of Ocean Drilling Program (ODP) Site 807A, located on the Ontong Java Plateau, western equatorial Pacific, revealed 50 planktic foraminiferal events, enabling the identification of eight late Neogene–Quaternary biozones, from the Globorotalia plesiotumida Interval Zone to the Globorotalia truncatulinoides Interval Zone. A significant faunal turnover (17 events) from late Pliocene identified in cores 7 and 8, between 70 and 55 meters below seafloor (mbsf), and spanning 0.67 million years (Myr). This noteworthy turnover may be the result of a shift in oceanographic conditions pertaining to the closure of the Indo–Pacific Seaway, followed by the Northern Hemisphere Glaciation. This study provides a high resolution biostratigraphic and biochronological framework for ODP Site 807A that will aid in correlation and timing the various paleoceanographic changes over the last 6 million years in the western equatorial Pacific.

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