The Remote Cooling

Land heats faster than ocean. This is basic climate physics — land has lower heat capacity, less thermal inertia, and responds more quickly to radiative forcing. Under greenhouse warming, continents warm roughly twice as fast as the ocean surface. The standard framing treats the ocean as the driver of large-scale climate patterns and the land as responding: El Niño warms western South America; the Atlantic Multidecadal Oscillation modulates European climate. Ocean drives; land follows.

The causal arrow also runs the other way. Regional land surface temperature warming over specific continents drives measurable changes in tropical sea surface temperature patterns through atmospheric teleconnections (arXiv:2603.28481, March 2026). The mechanism is not local. The effects propagate thousands of kilometers through stationary Rossby wave responses — atmospheric waves excited by land-surface heating that reorganize wind patterns over remote oceans.

South American land warming strengthens the tropical Pacific zonal sea surface temperature gradient, producing a more La Niña-like mean state. The mechanism: enhanced diabatic heating over the continent excites Rossby waves that intensify the southeast trade winds along the South American coast, strengthening coastal upwelling that brings cold water to the surface. The land heats; the ocean cools. North American warming produces North Pacific cooling through an analogous pathway. Central African warming drives tropical Atlantic cooling.

Not all continents produce remote ocean effects. Warming over the Maritime Continent and the Tibetan Plateau produces negligible sea surface temperature changes. The difference is in the atmospheric wave response — only certain heating patterns project efficiently onto Rossby wave modes that propagate to the ocean basins.

The structural observation is directional asymmetry in causation. The standard view — ocean drives land — is correct for interannual variability. El Niño modulates continental weather patterns on timescales of months to years. But on the timescales of decadal warming, the causation also runs from land to ocean. The faster-warming continents change the atmospheric circulation that sets the ocean’s surface temperature. The ocean is simultaneously the driver (at short timescales) and the driven (at long timescales). Which direction dominates depends on what temporal resolution you use — another instance of the frame determining the answer.

This matters for climate model evaluation. If a model has a warm bias over South America, it will produce an artificially strong Pacific zonal gradient — a La Niña bias — through the Rossby wave pathway. The ocean bias originates on land. Correcting the ocean simulation won’t fix the error because the error isn’t in the ocean model. It’s in the land model, propagated through the atmosphere, and deposited in the ocean. The diagnosis and the fix are in different components of the system.