A mechanistic analysis of tropical Pacific dynamic sea level in GFDL-OM4 under OMIP-I and OMIP-II forcings
-
Published:2021-05-05
Issue:5
Volume:14
Page:2471-2502
-
ISSN:1991-9603
-
Container-title:Geoscientific Model Development
-
language:en
-
Short-container-title:Geosci. Model Dev.
Author:
Hsu Chia-WeiORCID, Yin Jianjun, Griffies Stephen M.ORCID, Dussin Raphael
Abstract
Abstract. The sea level over the tropical Pacific is a key indicator reflecting vertically integrated heat distribution over the ocean.
Here, we use the Geophysical Fluid Dynamics Laboratory global ocean–sea ice model (GFDL-OM4) forced by both the Coordinated Ocean-Ice Reference Experiment (CORE) and Japanese 55-year Reanalysis (JRA-55)-based surface dataset for driving ocean–sea ice models (JRA55-do) atmospheric states (Ocean Model Intercomparison Project (OMIP) versions I and II) to evaluate the model performance and biases compared against available observations.
We find persisting mean state dynamic sea level (DSL) bias along 9∘ N even with updated wind forcing in JRA55-do relative to CORE.
The mean state bias is related to biases in wind stress forcing and geostrophic currents in the 4 to 9∘ N latitudinal band.
The simulation forced by JRA55-do significantly reduces the bias in DSL trend over the northern tropical Pacific relative to CORE.
In the CORE forcing, the anomalous westerly wind trend in the eastern tropical Pacific causes an underestimated DSL trend across the entire Pacific basin along 10∘ N.
The simulation forced by JRA55-do significantly reduces the bias in DSL trend over the northern tropical Pacific relative to CORE.
We also identify a bias in the easterly wind trend along 20∘ N in both JRA55-do and CORE, thus motivating future improvement.
In JRA55-do, an accurate Rossby wave initiated in the eastern tropical Pacific at seasonal timescale corrects a biased seasonal variability of the northern equatorial countercurrent in the CORE simulation.
Both CORE and JRA55-do generate realistic DSL variation during El Niño.
We find an asymmetry in the DSL pattern on two sides of the Equator is strongly related to wind stress curl that follows the sea level pressure evolution during El Niño.
Funder
Climate Program Office
Publisher
Copernicus GmbH
Reference46 articles.
1. Adcroft, A., Anderson, W., Balaji, V., Blanton, C., Bushuk, M., Dufour, C. O.,
Dunne, J. P., Griffies, S. M., Hallberg, R., Harrison, M. J., Held, I. M.,
Jansen, M. F., John, J. G., Krasting, J. P., Langenhorst, A. R., Legg, S.,
Liang, Z., McHugh, C., Radhakrishnan, A., Reichl, B. G., Rosati, T., Samuels,
B. L., Shao, A., Stouffer, R., Winton, M., Wittenberg, A. T., Xiang, B.,
Zadeh, N., and Zhang, R.: The GFDL Global Ocean and Sea Ice Model
OM4.0: Model Description and Simulation Features, J.
Adv. Model Earth Sy., 11, 3167–3211,
https://doi.org/10.1029/2019MS001726, 2019. a, b, c 2. Bromirski, P. D., Miller, A. J., Flick, R. E., and Auad, G.: Dynamical
Suppression of Sea Level Rise along the Pacific Coast of North
America: Indications for Imminent Acceleration, J. Geophys.
Res.-Oceans, 116, C07005, https://doi.org/10.1029/2010JC006759, 2011. a, b 3. Busalacchi, A. J. and Cane, M. A.: Hindcasts of Sea Level Variations during
the 1982–83 El Niño, J. Phys. Oceanogr., 15, 213–221,
https://doi.org/10.1175/1520-0485(1985)015<0213:HOSLVD>2.0.CO;2, 1985. a 4. Cane, M. A.: Modeling Sea Level During El Niño, J. Phys. Oceanogr., 14,
1864–1874, https://doi.org/10.1175/1520-0485(1984)014<1864:MSLDEN>2.0.CO;2, 1984. a 5. Chassignet, E. P., Smith, L. T., Halliwell, G. R., and Bleck, R.: North
Atlantic Simulations with the Hybrid Coordinate Ocean Model
(HYCOM): Impact of the Vertical Coordinate Choice, Reference
Pressure, and Thermobaricity, J. Phys. Oceanogr., 33, 2504–2526,
https://doi.org/10.1175/1520-0485(2003)033<2504:NASWTH>2.0.CO;2, 2003. a
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|