Climate Change

Monthly changes strength of the zonal flow
July 6, 2017

Looking at modeling simulations, researchers explore how various characteristics of the mid-latitude atmospheric circulation evolve over the 21st-century and find that changes are sector-dependent.

Probability density functions of equilibrium climate sensitivity
April 24, 2017

Equilibrium climate sensitivity (ECS) — defined as the near-surface air temperature change that would eventually result from a doubling of atmospheric CO2 — is a key metric of climate change. New findings suggest that the value of ECS estimated from global energy budget constraints is actually in agreement with values derived from other methods and simulated by global climate models.

AMOC RCP4.5 and 8.5
January 19, 2017

A new study shows that the AMOC is more sensitive to warming, including changes in the atmospheric hydrological cycle, than Greenland Ice Sheet melting. However, Greenland Ice Sheet melt further increases the projected AMOC weakening.

Agulhas leakage, not salinity, linked to the Atlantic meridional circulation slowdown
December 28, 2016

A new study concludes that the likely source of changes in heat that caused the recent slowdown in the AMOC was from a decrease in the Agulhas Leakage and that changes in convection in the subpolar North Atlantic was an unlikely contributor.

Ocean heat content over the past 60 years
December 7, 2016

A new paper shows that global mean surface temperature (GMST) is a measure of the Earth’s surface warming, not a measure of total accumulated heat energy in the Earth’s system. And the slowdown in GMST increase is most likely a redistribution of excess heat into and within the ocean.

Global-mean surface air temperature (SAT) anomalies with respect to preindustrial reference level. Left panel: Reconstructions of global-mean SAT anomaly for the last 784,000 years based on studies indicated in the panel. Right panel: Reconstructed and simulated global-mean SAT anomaly and global warming projections from data sources indicated in the panel.
November 23, 2016

New research looking at glacial-interglacial climate variability during the last 784,000 years finds that Earth's climate sensitivity is strongly dependent on the climate background state with significantly larger values attained during warm phases. Because the Earth is currently in a warm state, the associated increased climate sensitivity has to be taken into account for future warming projections.

Research onboard the RV Knorr
November 17, 2016

New research finds that changes in the strength of the Agulhas Current, since the early 1990s, has not increased, despite expectations based on rapidly warming sea surface temperatures. Instead, its flow has broadened due to more meanders and eddies.

Fingerprint of Greenland ice melt and the contribution to global sea level rise
October 20, 2016

New research shows that even the longest and highest-quality tide gauge data may underestimate the amount of global average sea level rise that occurred during the 20th century, due to their limited location.

Currents and rainfall around Florida
August 10, 2016

Robust surface ocean currents around Peninsular Florida, namely the Loop and the Florida Currents, are shown to affect the terrestrial wet season of Peninsular Florida. New research shows that differences in the ocean bathymetry (or topography) of two novel numerical climate model integrations can influence the ocean currents and their impact on regional climate.

Ocean oxygen levels
May 24, 2016

There is very little doubt that human-driven climate warming will ultimately result in widespread ocean deoxygenation; however, substantial natural variation and sparse observational records make it difficult to determine when. New research suggests that human-driven changes in oxygen levels are evident in many oceanic regions now and will be widespread in the next 15-20 years.

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