Fig. 3: Comparison of the half-precession cycles in the western equatorial Pacific (WEP) sea surface temperature (SST), subsurface sea temperature at 65 (sub65T) and 163 m (sub163T) variations in the Orb simulation with the three insolation indexes.
From: Forcing mechanisms of the half-precession cycle in the western equatorial Pacific temperature
a Bi-hemisphere meridional insolation gradient: the purple (blue) line is November (May) meridional insolation gradients between 0° and 30°N (between 0° and 30°S), and the yellow dashed line is the maximum of them40. b Bi-hemisphere insolation: the purple (blue) line is June (December) insolation at 30°N (30°S), and the yellow dashed line is the maximum of them40. The gray line is eccentricity. c Insolation at the Equator: the purple (blue) line is March (September) insolation, the yellow dashed line is the maximum of them40. The gray line is eccentricity. d–f The filtered half-precession cycle (8–12 kyr) of SST, sub65T and sub163T, respectively. The vertical dashed lines indicate the peaks of the half-precession cycle of SST. g Cross wavelet spectra between the SST and the maximum equatorial insolation. h Same as (g), but for sub65T. i Cross wavelet spectra between the sub163T and the bi-hemisphere maximum insolation.
