On the Interdecadal Variation of the Warm Water Volume in the Tropical Pacific Around 1999/2000

Li, Xiaofan; Hu, Zeng‐Zhen; Huang, Bohua; Jin, Fei‐Fei

doi:10.1029/2020JD033306

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On the Interdecadal Variation of the Warm Water Volume in the Tropical Pacific Around 1999/2000

2020
By Li, Xiaofan ; Hu, Zeng‐Zhen ; Huang, Bohua ; ...
Source: Journal of Geophysical Research: Atmospheres,125, e2020JD033306.

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Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Li, Xiaofan ; Hu, Zeng‐Zhen ; Huang, Bohua ; Jin, Fei‐Fei

Li, Xiaofan ; Hu, Zeng‐Zhen ; Huang, Bohua ; Jin, Fei‐Fei Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction) Less -
Description:

A profound change in the variations of warm water volume (WWV) of the tropical Pacific occurred around 1999/2000, coincided with the interdecadal shift of the El Nino-Southern Oscillation (ENSO) properties to a higher frequency and smaller amplitude regime. The persistence of WWV is decreased for all calendar months since 2000, associated with a decrease in its variance and an increase in its frequency. Moreover, the WWV-sea surface temperature relationship associated with the ENSO cycle is weakened during 2000-2019, implying that the recharge/discharge process is less efficient in driving the phase transition of an ENSO cycle and ENSO became less periodical compared with that during 1979-1999. Corresponding to the weaker precursory connection of WWV to ENSO, the geographical origin of precedent thermocline anomalies has shown a northwestward migration since 2000. This is consistent with the suppression of the equatorial air-sea feedback and the systematical northwestward shift of the atmosphere-ocean coupling center in the tropical Pacific. Changed annual cycle and enhanced zonal contrast of sea surface temperature in the equatorial Pacific may be connected with the interdecadal variations of the ENSO and WWV features.
Keywords:

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1999 2000 Amplitude Annual Cycle Atmospheric Sciences Decrease El-nino Enso Equatorial Pacific Frequency Increase Interdecadal Variation La-nina Meteorology Northwestward Shift Of Ocean-atmosphere Coupling Ocean Recharge Paradigm Persistence Temperature Time Variability Volume In The Tropical Pacific Warm Water Wavelet Analysis
Source:

Journal of Geophysical Research: Atmospheres,125, e2020JD033306.
DOI:

https://doi.org/10.1029/2020JD033306
Document Type:

Journal Article
Funding:

Grant no. NA17OAR4310144
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Submitted
Main Document Checksum:

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urn:sha256:c05fae86338a17249b1ce0b47ca34322b322a5be6edf2bd8a54236826a2b2cc3
Download URL:

https://repository.library.noaa.gov/view/noaa/28704/noaa_28704_DS1.pdf
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