Figure 2
From: Structure and dynamics of the Pacific North Equatorial Subsurface Current
Hovmüller plot of the geostrophic volume transport within 1.5° latitudes from the axis of the NESC between 200 and 600 m (“Methods”) (a) and its interannual anomanlies in reference to the 2004–2018 climatology (b). (c) Comparison of the interannual geostrophic volume transport and the associated heat transport averaged between 135° E and 145° E, with the Niño 3.4 index. The interannual anomalies of the transports and the Niño 3.4 index have been low passed by a Butterworth filter with a cutoff period of 13 months. The total transport in (a) and its interannual anomalies in (b) are further smoothed by 3° and 10° longitudinal moving averages, respectively. Blue and red shadings indicate westward (negative) and eastward (positive) transports or transport anomalies, respectively. Black thin lines mark the 5 Sv and 2 Sv contours in (a) and (b), respectively. Unit of the volume and heat transports is Sv (1 × 106 m3 s−1) and PW (1 × 1015 W), respectively. Unit of the Niño 3.4 index is degree Celsius. The figure is generented by MATLAB software version R2019b (https://www.mathworks.com/).
