Interannual and decadal variability in tropical Pacific sea level

Cheryl E. Peyser, Jianjun Yin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A notable feature in the first 20-year satellite altimetry records is an anomalously fast sea level rise (SLR) in the western Pacific impacting island nations in this region. This observed trend is due to a combination of internal variability and external forcing. The dominant mode of dynamic sea level (DSL) variability in the tropical Pacific presents as an east-west see-saw pattern. To assess model skill in simulating this variability mode, we compare 38 Coupled Model Intercomparison Project Phase 5 (CMIP5) models with 23-year satellite data, 55-year reanalysis products, and 60-year sea level reconstruction. We find that models underestimate variance in the Pacific sea level see-saw, especially at decadal, and longer, time scales. The interannual underestimation is likely due to a relatively low variability in the tropical zonal wind stress. Decadal sea level variability may be influenced by additional factors, such as wind stress at higher latitudes, subtropical gyre position and strength, and eddy heat transport. The interannual variability of the Niño 3.4 index is better represented in CMIP5 models despite low tropical Pacific wind stress variability. However, as with sea level, variability in the Niño 3.4 index is underestimated on decadal time scales. Our results show that DSL should be considered, in addition to sea surface temperature (SST), when evaluating model performance in capturing Pacific variability, as it is directly related to heat content in the ocean column.

Original languageEnglish (US)
Article number402
JournalWater (Switzerland)
Volume9
Issue number6
DOIs
StatePublished - Jun 5 2017

Fingerprint

Sea level
Oceans and Seas
sea level
Wind stress
wind stress
timescale
Satellites
heat
satellite altimetry
zonal wind
gyre
Hot Temperature
Pacific Islands
satellite data
eddy
sea surface temperature
Pacific Ocean Islands
Enthalpy
surface temperature
remote sensing

Keywords

  • Climate modelling
  • Climate variability
  • Pacific Ocean
  • Sea level rise
  • Wind stress

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Biochemistry
  • Aquatic Science
  • Water Science and Technology

Cite this

Interannual and decadal variability in tropical Pacific sea level. / Peyser, Cheryl E.; Yin, Jianjun.

In: Water (Switzerland), Vol. 9, No. 6, 402, 05.06.2017.

Research output: Contribution to journalArticle

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