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Ocean Dynamics

, Volume 68, Issue 9, pp 1155–1168 | Cite as

Decadal variability and trends of oceanic barrier layers in tropical Pacific

  • Lingxia Wang
  • Fanghua Xu
Article
Part of the following topical collections:
  1. Topical Collection on the 9th International Workshop on Modeling the Ocean (IWMO), Seoul, Korea, 3-6 July 2017

Abstract

Decadal variability and trends of the isothermal layer depth (ILD), mixed layer depth (MLD), and barrier layer thickness (BLT) were analyzed for the tropical Pacific during 1979–2015. The decadal variability of ILD, MLD, and BLT shows a close connection with the Pacific Decadal Oscillation (PDO). At PDO positive phase, the eastward shift of precipitation and weakened trade winds result in thinner BLT in western Pacific and thicker BLT in central and eastern Pacific. The situation is reversed at PDO negative phase. The differences in BLT can be up to 9–15 m. The spatial distributions of decadal trends of ILD and MLD are complex, but a thickening of BLT in the western tropical Pacific is clearly present. The raw trends of ILD, MLD, and BLT averaged in the tropical Pacific (30° N–30° S, 120° E–75° W) from 1979 to 2015 are 1.62, 1.20, and 0.51 m per decade, respectively. PDO can explain about 25% of the increasing trends of BLT, while El Niño-Southern Oscillation (ENSO) only explains about 1.7%. Global warming and/or variability at longer time scales is responsible for the remaining increasing trends. The BLT change is related to the warming and freshening of the western Pacific warm pool in recent decades. The ocean-atmosphere interactions about trade winds, wind-driven ocean circulation, temperature, and precipitation/evaporation are discussed.

Keywords

Barrier layers Tropical Pacific Decadal variability and trends PDO 

Notes

Acknowledgements

The work is supported by the National Key R&D Program of China, No. 2016YFC1401408, and National Natural Science Foundation of China (No. 41576018 and No. 41606020).

Supplementary material

10236_2018_1191_MOESM1_ESM.pdf (4.4 mb)
ESM 1 (PDF 4527 kb)

References

  1. Balaguru K, Chang P, Saravanan R, Leung LR, Xu Z, Li MK, Hsieh JS (2012) Ocean barrier layers’ effect on tropical cyclone intensification. PNAS 109(36):14343–14347CrossRefGoogle Scholar
  2. Bosc C, Delcroix T, Maes C (2009) Barrier layer variability in the western Pacific warm pool from 2000 to 2007. Journal of Geophysical Research: Oceans 114(6):1–14.  https://doi.org/10.1029/2008JC005187 Google Scholar
  3. Breugem WP, Chang P, Jang CJ, Mignot J, Hazeleger W (2008) Barrier layers and tropical Atlantic SST biases in coupled GCMs. Tellus Ser A Dyn Meteorol Oceanogr 60(5):885–897.  https://doi.org/10.1111/j.1600-0870.2008.00343.x CrossRefGoogle Scholar
  4. Cravatte S, Delcroix T, Zhang D, McPhaden M, Leloup J (2009) Observed freshening and warming of the western Pacific Warm Pool. Clim Dyn 33(4):565–589.  https://doi.org/10.1007/s00382-009-0526-7 CrossRefGoogle Scholar
  5. Cronin MF, Mcphaden MJ (2002) Barrier layer formation during westerly wind bursts. Journal of Geophysical Research Oceans 107(C12):SRF 21-1–SRF 21-12CrossRefGoogle Scholar
  6. de Boyer Montégut C, Mignot J, Lazar A, Cravatte S (2007) Control of salinity on the mixed layer depth in the world ocean: 1. General description. Journal of Geophysical Research: Oceans 112(6):1–12.  https://doi.org/10.1029/2006JC003953 Google Scholar
  7. Defant A (1961) Physical oceanography, vol 1. Pergamon, London, p 729Google Scholar
  8. Delcroix T, Cravatte S, McPhaden MJ (2007) Decadal variations and trends in tropical Pacific sea surface salinity since 1970. J Geophys Res 112.  https://doi.org/10.1029/2006JC003801
  9. England MH, McGregor S, Spence P, Meehl GA, Timmermann A, Cai W et al (2014) Recent intensification of wind-driven circulation in the Pacific and the ongoing warming hiatus. Nat Clim Chang 4(3):222–227CrossRefGoogle Scholar
  10. Feng M, Peter H, Roger L (1998) Upper ocean heat and salt balances in response to a westerly wind burst in the western equatorial Pacific during TOGA COARE. Journal of Geophysical Research Oceans 103(C5):10289–10311CrossRefGoogle Scholar
  11. Foltz GR, McPhaden MJ (2009) Impact of barrier layer thickness on SST in the central tropical North Atlantic. J Clim 22(2):285–299.  https://doi.org/10.1175/2008JCLI2308.1 CrossRefGoogle Scholar
  12. Gershunov A, Barnett TP (1998) Interdecadal modulation of ENSO teleconnections. Bull Am Meteorol Soc 79(12):2715–2726CrossRefGoogle Scholar
  13. Giese BS, Seidel HF, Compo GP, Sardeshmukh PD (2016) An ensemble of ocean reanalyses for 1815–2013 with sparse observational input. J Geophys Res Oceans Accepted Author Manuscript 121:6891–6910.  https://doi.org/10.1002/2016JC012079 CrossRefGoogle Scholar
  14. Godfrey JS, Lindstrom EJ (1989) The heat budget of the equatorial western Pacific surface mixed layer. J Geophys Res 94:8007–8017CrossRefGoogle Scholar
  15. Good SA, Martin MJ, Rayner NA (2013) En4: quality controlled ocean temperature and salinity profiles and monthly objective analyses with uncertainty estimates. J Geophys Res 118(12):6704–6716CrossRefGoogle Scholar
  16. Held IM, Winton M, Takahashi K, Delworth T, Zeng F, Vallis GK (2010) Probing the fast and slow components of global warming by returning abruptly to preindustrial forcing. J Clim 23:2418–2427.  https://doi.org/10.1175/2009JCLI3466.1 CrossRefGoogle Scholar
  17. Huang RX (2015) Heaving modes in the world oceans. Clim Dyn 45(11–12):3563–3591CrossRefGoogle Scholar
  18. Huang HP, Seager R, Kushnir Y (2005) The 1976/77 transition in precipitation over the Americas and the influence of tropical sea surface temperature [C]// Aerospace Sciences Meeting And Exhibit 1775–1782Google Scholar
  19. Ishii M, Shouji A, Sugimoto S, Matsumoto T (2005) Objective analyses of sea‐surface temperature and marine meteorological variables for the 20th century using ICOADS and the Kobe Collection. Int J Climatol 25(7):865–879.Google Scholar
  20. Jackett DR, Mcdougall TJ (1995) Minimal adjustment of hydrographic profiles to achieve static stability. J Atmos Ocean Technol 12(2):381–389CrossRefGoogle Scholar
  21. Kolodziejczyk N, Gaillard F (2015) Variability of the heat and salt budget in the subtropical southeastern Pacific mixed layer between 2004 and 2010: spice injection mechanism. J Phys Oceanogr 43(9):5373Google Scholar
  22. Lee E-J, Noh Y, Qiu B, Yeh S-W (2015) Seasonal variation of the upper ocean response to surface heating in the North Pacific. JGR Oceans 120:5631–5647.  https://doi.org/10.1002/2015JC010800 Google Scholar
  23. Liu H, Grodsky SA, Carton JA (2009) Observed subseasonal variability of oceanic barrier and compensated layers. J Clim 22(22):6104–6119CrossRefGoogle Scholar
  24. Liu HL, Lin WY, Zhang MH (2010) Heat budget of the upper ocean in the south-central equatorial Pacific. J Clim 23(7):1779–1792CrossRefGoogle Scholar
  25. Liu W, Xie S-P, Lu J (2016) Tracking ocean heat uptake during the surface warming hiatus. Nat Commun 7:12542.  https://doi.org/10.1038/ncomms12542 CrossRefGoogle Scholar
  26. Lukas R, Lindstrom E (1991) The mixed layer of the western equatorial Pacific Ocean [J]. Journal of Geophysical Research Oceans 96(S01):3343–3357Google Scholar
  27. Maes C, Picaut J, Belamari S (2002) Salinity barrier layer and onset of El Niño in a Pacific coupled model. Geophys Res Lett 29(24):2206–59-4.  https://doi.org/10.1029/2002GL016029 CrossRefGoogle Scholar
  28. Maes C, Picaut J, Kentaro A, Yoshifumi K (2004) Characteristics of the convergence zone at the eastern edge of the Pacific warm pool. Geophys Res Lett 31:L11304.  https://doi.org/10.1029/2004GL019867 CrossRefGoogle Scholar
  29. Masson S, Luo JJ, Madec G et al (2005) Impact of barrier layer on winter-spring variability of the southeastern Arabian Sea. Geophys Res Lett 32(7):99–119CrossRefGoogle Scholar
  30. Mccreary JPJ, Peng L (1994) Interaction between the Subtropical and Equatorial Ocean Circulations—the subtropical cell. J Phys Oceanogr 24(2):466–497CrossRefGoogle Scholar
  31. Mignot J, de Boyer Montégut C, Lazar A, Cravatte S (2007) Control of salinity on the mixed layer depth in the world ocean: 2. Tropical areas. Journal of Geophysical Research: Oceans 112(10):1–12.  https://doi.org/10.1029/2006JC003954 Google Scholar
  32. Qu T, Meyers G (2005) Seasonal variation of barrier layer in the southeastern tropical Indian Ocean. J Geophys Res 110(C11):C11003.  https://doi.org/10.1029/2004JC002816 CrossRefGoogle Scholar
  33. Qu T, Song YT, Maes C (2014) Sea surface salinity and barrier layer variability in the equatorial Pacific as seen from Aquarius and Argo. Journal of Geophysical Research: Oceans 119(1):15–29.  https://doi.org/10.1002/2013JC009375 Google Scholar
  34. Skliris N, Marsh R, Josey SA, Good SA, Liu C, Allan RP (2014) Salinity changes in the World Ocean since 1950 in relation to changing surface freshwater fluxes. 709–736.  https://doi.org/10.1007/s00382-014-2131-7
  35. Sprintall J, Tomczak M (1992) Evidence of the barrier layer in the surface-layer of the tropics. Journal of Geophysical Research-Oceans 97:7305–7316.  https://doi.org/10.1029/92JC00407 CrossRefGoogle Scholar
  36. Toggweiler JR, Dixon K, Broecker WS (1991) The Peru upwelling and the ventilation of the South Pacific thermocline. Journal of Geophysical Research Oceans 96(C11):20,467–20,497CrossRefGoogle Scholar
  37. Tomczak M, Godfrey JS (1994) Regional oceanography: an introduction. Pergamon, New York, p 422Google Scholar
  38. Vialard J, Delecluse P (1998) An OGCM study for the TOGA decade. Part I: role of salinity in the physics of the western Pacific fresh pool. J Phys Oceanogr 28(6):1071–1088CrossRefGoogle Scholar
  39. Wang X, Liu H (2015) Seasonal-to-interannual variability of the barrier layer in the western Pacific warm pool associated with ENSO. Clim Dyn 47(1–2):375–392.  https://doi.org/10.1007/s00382-015-2842-4 Google Scholar
  40. Yim B-Y, Noh Y, Yeh S-W, Kug J-S, Min H-S, Qiu B (2013) Ocean mixed layer processes in the Pacific Decadal Oscillation in coupled general circulation model. Clim Dyn 41:1407–1417CrossRefGoogle Scholar
  41. Zhang D, McPhaden MJ (2006) Decadal variability of the shallow Pacific meridional overturning circulation: relation to tropical sea surface temperatures in observations and climate change models. Ocean Model 15(3–4):250–273.  https://doi.org/10.1016/j.ocemod.2005.12.005 CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System ScienceTsinghua UniversityBeijingChina

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