Ocean-Atmosphere Interaction and Climate Variability

Ocean–atmosphere interaction underpins the Earth’s climate system by linking heat, moisture and momentum exchanges at the sea surface with atmospheric circulation patterns. Variations in sea surface temperature (SST) drive changes in atmospheric pressure, wind stress and convection on timescales ranging from days to decades. Iconic modes of variability such as the El Niño–Southern Oscillation (ENSO) in the tropical Pacific and the Atlantic multidecadal oscillation (AMO) illustrate how oceanic anomalies propagate through the atmosphere and influence weather extremes, monsoons and storm tracks worldwide. Feedback processes—such as the wind-evaporation-SST effect and cloud-radiation interactions—amplify or damp these anomalies, creating persistence or transitions between climate regimes. Beyond basin-scale phenomena, interbasin teleconnections link tropical Atlantic, Pacific and Indian Ocean variability via atmospheric wave trains and the global Walker circulation, modulating regional temperature and precipitation patterns. Internal variability arising from oceanic ‘memory’ and chaotic turbulence also contributes to low-frequency fluctuations, posing challenges for detection, attribution and long-range prediction. Recent advances in high-resolution observations, probabilistic modelling and causal discovery methods are refining our understanding of these coupled mechanisms, enhancing forecast skill and informing climate risk management.

Research from Nature Portfolio

Recent studies have elucidated the role of stochastic processes and intrinsic memory in regional sea–air coupling. A 2023 analysis of numerical ensembles for the Bohai and Yellow Sea demonstrated that scale-dependent memory governs the emergence of red-noise variability, with tides modulating long-term fluctuations through their impact on system memory. This work confirms theoretical predictions that internal variability can be markedly enhanced even without external forcing when key processes are altered. Seminal experiments dating from 2017 revealed that multidecadal SST variability in the western tropical Pacific is largely forced by the Atlantic multidecadal oscillation. Atmosphere–ocean pacemaker simulations showed that remote Atlantic warming initiates atmospheric teleconnections to the North Pacific, altering subtropical westerlies and triggering feedbacks that amplify Pacific SST anomalies. These findings highlight the Atlantic Ocean’s role as a ‘pacemaker’ for Pacific climate variations and underscore the importance of interbasin coupling for decadal prediction.

Research from all publishers

Investigations beyond Nature Portfolio have further illuminated interannual and decadal linkages. A 2023 study identified a pronounced negative relationship between tropical southern Atlantic SST anomalies and East Asian spring surface temperatures, attributing this to an anomalous Walker circulation and a resulting atmospheric wave train that alters potential vorticity and temperature fields over East Asia. Also in 2023, regime-oriented causal discovery applied to CMIP6 and reanalysis data characterised how phase-dependent interactions between Atlantic and Pacific decadal modes evolve, assessing model skill in reproducing observed teleconnection fingerprints. Complementing these advances, a multi-model assessment in 2021 quantified the tropical Pacific cooling response to Atlantic multidecadal variability, demonstrating that correcting model precipitation biases reduces inter-model spread and yields a more consistent equatorial Pacific temperature response to Atlantic warming.

Ocean-Atmosphere Interaction and Climate Variability publication trend

The graph below shows the total number of articles in ocean-atmosphere interaction and climate variability across all publications each year (not limited to Nature Index journals).

Technical terms

Sea surface temperature (SST): Temperature of the ocean at its interface with the atmosphere, crucial for heat and moisture exchange.
El Niño–Southern Oscillation (ENSO): Interannual oscillation featuring episodic warming (El Niño) and cooling (La Niña) in the tropical Pacific, influencing global climate.
Atlantic multidecadal oscillation (AMO): Long-period fluctuation of North Atlantic SSTs occurring over 20–40 years, affecting climate variability worldwide.
Teleconnection: Atmospheric or oceanic linkage between distant regions, whereby an anomaly in one basin induces remote climate responses.
Walker circulation: Equatorial east–west atmospheric cell driven by SST contrasts between ocean basins, modulating tropical rainfall and pressure patterns.
Internal variability: Natural climate fluctuations arising from interactions within the climate system, independent of external forcings.

References

1. The Stochastic Climate Model helps reveal the role of memory in internal variability in the Bohai and Yellow Sea. Communications Earth & Environment (2023).
2. Western tropical Pacific multidecadal variability forced by the Atlantic multidecadal oscillation. Nature Communications (2017).
3. Interannual impact of tropical southern Atlantic SST on surface air temperature over East Asia during boreal spring. npj Climate and Atmospheric Science (2023).
4. Regime-oriented causal model evaluation of Atlantic–Pacific teleconnections in CMIP6. Earth System Dynamics (2023).
5. Impacts of Atlantic multidecadal variability on the tropical Pacific: a multi-model study. npj Climate and Atmospheric Science (2021).