The different relationship of Pacific interior subtropical cells and two types of ENSO
- 128 Downloads
The Pacific interior subtropical−tropical cells (STCs) and their relation to the two types of El Niño-Southern Oscillation (ENSO) are investigated by using GODAS reanalysis ocean data for the period of 1980–2017. The results show that the interior STC transport into the equatorial region across 9°S and 9°N has a close relationship with the eastern Pacific (EP) ENSO, while it is much weaker with the central Pacific (CP) ENSO. It is suggested that the effect of interior STCs on the tropical Pacific climate is reflected in its relation with the western Pacific thermocline depth or SSHA. During the EP El Niño, the anomalous interior STCs at 9°S and 9°N converge to the equatorial region from the lag months of − 25 to − 8, leading to an accumulation of heat content in the equatorial Pacific; from the lag months of − 8 to 10, they diverge poleward, inducing a discharge of equatorial heat content. The peak poleward interior STC anomaly first appears at 9°N at a zero-lag time, while that at 9°S is observed 4–5 months later. But there is also no appearance of a time lag between the interior STCs at 9°N and 9°S in recharging the period during the EP La Niña mature phase. However, during CP El Niño, only the conspicuous anomalous interior STC divergence appears during the mature and decay phases for the lag months of − 2 to 10, with being symmetric at 9°N and 9°S.
KeywordsPacific Ocean Subtropical–tropical cells El Niño-Southern oscillation Eastern Pacific El Niño Central Pacific El Niño
The GODAS and NOAA_ERSST_V4 data, provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, are from the web site at http://www.esrl.noaa.gov/psd/. This work was supported by the Natural Science Foundation of China (NSFC) (nos. 41476017, 41330963, 41506016, 41576014, 41506023), NSFC-Shandong Joint Fund for Marine Science Research Centers (no. U1406401), and Fund for Innovative Research Groups of the NSFC (no. 41421005).
- Behringer DW, Xue Y (2004) Evaluation of the global ocean data assimilation system at NCEP: the Pacific Ocean. In: Eighth symposium on integrated observing and assimilation systems for atmosphere, oceans, and land surface, AMS 84th annual meeting, Washington State Convention and Trade Center, Seattle, Washington, pp 11–15Google Scholar
- Bjornsson H, Venegas SA (1997) A manual for EOF and SVD analyses of climatic data. C2GCR Rep 97(1):52Google Scholar
- Hu DX, Wang F, Wu LX, Chen DK, Liu QY, Tian JW, Yuan DL, Mayer B, Adi R, Ando K, Kashino Y, Masumoto Y, Lee JH, Jeon D, Villanoy C, Gordon A, Kessler W, Qiu B, Qu TD, Riser S, Susanto D, Zhang DX (2011) Northwestern Pacific Ocean circulation and climate experiment (NPOCE) science/implementation plan. China Ocean Press, FujianGoogle Scholar