Abstract Seasonal modulation of subthermocline eddy kinetic energy (EKE) east the Philippines and its associated dynamics are studied, using mooring measurements outputs from an eddy-resolving ocean general circulation model for period 2000 to 2017. Significantly high EKE appears below thermocline in latitude band between 5° 14°N Philippines. Separated by 10°N, northern southern parts region sh...

Historical ship drifts from the tropical Atlantic Ocean are compared with surface currents from a general circulation model forced with monthly mean climatological winds. The model accurately reproduces the spatial structure of the currents and its time dependence, which varies considerably from the eastern side of the basin, where a semiannual harmonic is prominent, to the western side, where ...

The adjoint of an ocean general circulation model is used as a tool for investigating the causes of changes in ENSO SST indices. We identify adjoint Kelvin and Rossby waves in the sensitivities to sea level and wind stress at earlier times, which can be traced back for more than a year through western and weak eastern boundary reeections. Depending on the thermocline depth the rst and second ba...

A simulation with a coupled atmosphere-ocean general circulation model configured for the Last Glacial Maximum delivered a tropical climate that is much cooler than that produced by atmosphere-only models. The main reason is a decrease in tropical sea surface temperatures, up to 6 degrees C in the western tropical Pacific, which occurs because of two processes. The trade winds induce equatorial...

We use a combination of simple scalings and analytical expressions as well as an 10 idealized numerical model of basin-scale circulation, biogeochemical cycles and ecology, to elucidate and illustrate factors which regulate the distribution of tracer DINxs = NO − 3 − 16PO 4 , its temporal variability, and the distribution of diazotrophs in the North Atlantic. We infer that the observed subsurfa...

This SI Appendix is formed by three sections. Section 1 contains a brief discussion of the derivations of the dynamical model and its low-order meridional truncation. The details of boundary conditions, numerical solvers as well as a list of the parameter values are also included. The mathematical formula of the anomalous Walker circulation is shown at the end of this section. Section 2 involve...

This SI Appendix is formed by three sections. Section 1 contains a brief discussion of the derivations of the dynamical model and its low-order meridional truncation. The details of boundary conditions, numerical solvers as well as a list of the parameter values are also included. The mathematical formula of the Walker circulation is shown at the end of this section. Section 2 involves the basi...

Abstract This study investigates the role of convection–circulation coupling on simulated eastward propagation Madden–Julian Oscillation (MJO) over Maritime Continent (MC). Experiments are conducted with European Centre Hamburg Model Version 5 (ECHAM5) coupled one-column ocean model—Snow-Ice-Thermocline (SIT) and two different cumulus schemes, Nordeng-Tiedtke (E5SIT-Nord) Tiedtke (E5SIT-Tied). ...

Paleoclimate proxy evidence suggests a southward shift of the Intertropical Convergence Zone (ITCZ) during times of Northern Hemisphere cooling, including the Last Glacial Maximum, 19–23 ka before present. However, evidence for movement over the Pacific has mainly been limited to precipitation reconstructions near the continents, and the position of the Pacific marine ITCZ is less well constrai...

[1] We argue that diagnostics of excess dissolved calcium carbonate (TA*) above the saturation horizon cannot be unambiguously interpreted in terms of local in situ dissolution. We examine a three-dimensional numerical model of global ocean circulation and biogeochemistry with explicit representation of the formation and dissolution of calcium carbonate. In particular, dissolution is only allow...