An Estimate of the Climatological Heat Fluxes over the Tropical Pacific Ocean

Author(s):  
R. K. Reed
2006 ◽  
Vol 19 (22) ◽  
pp. 5889-5902 ◽  
Author(s):  
Ludos-Herve Ayina ◽  
Abderrahim Bentamy ◽  
Alberto M. Mestas-Nuñez ◽  
Gurvan Madec

Abstract Several oceanic operational programs use remotely sensed fluxes to complement atmospheric operational analyses from major national weather prediction centers. The main goal of this study is to evaluate the ability of the ocean model (ORCA) to correctly simulate the dynamic of the tropical Pacific Ocean in 1996–98 when forced by the satellite turbulent fluxes (wind stress and latent heat fluxes). The results are compared with the oceanic response resulting from forcing the model with the European Centre for Medium-Range Weather Forecasts (ECMWF) operational analysis. Three sensitivity simulations forced with satellite and atmospheric analysis fields are performed. The control experiment is forced with the ECMWF fluxes. The solutions of these simulations are compared with data from the Tropical Atmosphere–Ocean (TAO) buoys and from sea surface temperatures analysis by Reynolds and Smith in the equatorial Pacific Ocean. The analysis results indicate that the model reproduces well the major spatial and temporal oceanic structures including the main characteristics of the 1997–98 El Niño. More specifically, the comparisons with buoys indicate that the experiment forced by the winds and the satellite latent heat fluxes is closer to the observations. They provide weak rms difference and strong correlations along the whole 500-m depth column. Furthermore, the correlations with the SST analysis vary between 75% and 95% compared to 65% and 77% for the experiment forced by ECMWF fluxes. The currents in the first 350 m also show a strong sensitivity to satellite turbulent fluxes.


2012 ◽  
Vol 87 ◽  
pp. 194-209 ◽  
Author(s):  
Stella C. Woodard ◽  
Deborah J. Thomas ◽  
Franco Marcantonio

1998 ◽  
Vol 103 (C13) ◽  
pp. 30855-30871 ◽  
Author(s):  
Sonia Bauer ◽  
Mark S. Swenson ◽  
Annalisa Griffa ◽  
Arthur J. Mariano ◽  
Ken Owens

2012 ◽  
Vol 68 (5) ◽  
pp. 687-701 ◽  
Author(s):  
Jian Chen ◽  
Ren Zhang ◽  
Huizan Wang ◽  
Yuzhu An ◽  
Peng Peng ◽  
...  

Science ◽  
2014 ◽  
Vol 343 (6174) ◽  
pp. 976-978 ◽  
Author(s):  
A. Clement ◽  
P. DiNezio

2018 ◽  
Vol 45 (18) ◽  
pp. 9739-9747 ◽  
Author(s):  
T. A. Schramek ◽  
P. L. Colin ◽  
M. A. Merrifield ◽  
E. J. Terrill

2021 ◽  
Author(s):  
Arthur Oldeman ◽  
Michiel Baatsen ◽  
Anna von der Heydt ◽  
Henk Dijkstra ◽  
Julia Tindall

<p>The mid-Piacenzian or mid-Pliocene warm period (mPWP, 3.264 – 3.025 Ma) is the most recent geological period to see atmospheric CO­<sub>2</sub> levels similar to the present-day values (~400 ppm). Some proxy reconstructions for the mPWP show reduced zonal SST gradients in the tropical Pacific Ocean, possibly indicating an El Niño-like mean state in the mid-Pliocene. However, past modelling studies do not show the same results. Efforts to understand mPWP climate dynamics have led to the Pliocene Model Intercomparison Project (PlioMIP). Results from the first phase (PlioMIP1) showed clear El Niño variability (albeit significantly reduced) and did not show the greatly reduced time-mean zonal SST gradient suggested by some of the proxies.</p><p>In this work, we study ENSO variability in the PlioMIP2 ensemble, which consists of additional global coupled climate models and updated boundary conditions compared to PlioMIP1. We quantify ENSO amplitude, period and spatial structure as well as the tropical Pacific annual mean state in a mid-Pliocene and pre-industrial reference simulation. Results show a reduced El Niño amplitude in the model- ensemble mean, with 11 out of 13 individual models showing such a reduction. Furthermore, the spectral power of this variability considerably decreases in the 3–7-year band and shifts to higher frequencies compared to pre-industrial. The spatial structure of the dominant EOF shows no particular change in the patterns of tropical Pacific variability in the model-ensemble mean, compared to the pre-industrial. Further analyses that will be presented include the correlation of the zonal SST gradient with the El Niño amplitude, investigation of shift in El Niño flavour, and a discussion of the coupled feedbacks at play in the mid-Pliocene tropical Pacific Ocean.</p>


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