Zonally averaged multi-model average shortwave low cloud feedbacks
Latest Earth System Models predict more global warming than their predecessors

Zelinka and coauthors compared ECS values derived from CO2 quadrupling experiments conducted with CMIP6 and CMIP5 models and found that the latest models warm more than their predecessors by about 0.5˚C. The primary culprit for the enhanced warming was shown to be clouds.

Mean 2014-2016 sea surface temperature anomaly (SSTa) in the Northeast Pacific
Diverse processes driving a heatwave’s evolution result in conditional forecast skill for the US West Coast

A recent study explored sea surface temperature anomaly forecasts from an ensemble of eight global climate prediction systems contributing to NMME and found that predictability of warm temperature anomalies off the US West Coast was conditional on which process was driving the temperature anomalies in different phases of the heatwave.

How short-term Arctic warming can lead to delayed stratospheric circulation responses

A recent study uses large ensembles of an idealized general circulation model to demonstrate how episodic surface warming in the Arctic can lead to delayed responses in the stratosphere that persist for about two months, even in the absence of stationary waves.

Estimates of interannual variability from new and published coral δ18O records from the northern Line Islands
Coral reconstructions of central tropical Pacific climate suggest a 25% increase in recent El Niño Southern Oscillation intensity

Comparison of the fossil corals samples with modern corals showed that the recent ENSO intensification was quite apparent – the most recent 20 years was stronger than almost all 20-year periods measured over the entire preindustrial fossil coral dataset.

Swiftly shifting southward: CO2-forced tropical widening is larger in the Southern Hemisphere

Under exclusive CO2 forcing, climate models predicted twice as much Hadley cell expansion in the Southern Hemisphere as in the Northern Hemisphere. The finding was robust across models and all seasons except boreal fall.

Reconstruction of the weather on February 10, 1936 at 12 UTC
Reconstructing the past 200 years of global weather

A new version 3 of the NOAA-CIRES-DOE 20th Century Reanalysis (20CRv3) recreates a 180-year history of temperature, precipitation, winds, humidity, and many other variables from below the land surface to the top of the atmosphere.

Welcome to the US Climate Variability and Predictability Program

New Nature Climate Change paper from Large Ensembles Working Group

NCC Large Ensembles

New publication in Nature Climate Change featuring the Large Ensembles Working Group: "Insights from Earth system model initial-condition large ensembles and future prospects". Read about the opportunities and challenges confronting the design and dissemination of future large ensembles, including increased spatial resolution and model complexity alongside emerging Earth system applications.

March Newsgram

2020 March Newsgram

The latest news, meetings, jobs, and funding opportunities for the climate science community in our March Newsgram. Read how the Project Office is responding to the COVID-19 pandemic and more.

CLIVAR-relevant meetings and workshop status

Coronavirus news

We have compiled a list of relevant meetings and workshops and their status as we all grapple with the fast-changing evolution of the Coronavirus (COVID-19) outbreak and the governmental, organizational, and personal decisions that are affecting our work lives. The list is not intended to be exhaustive and status of these events may change at any time.

Spring 2020 call for US CLIVAR-supported workshops

Participants of the Surface Currents Workshop

Requests are now being accepted for US CLIVAR-sponsored workshops. Submissions are encouraged from the US climate science community and their collaborators. All documents must be submitted by April 27. The next call for workshops will be in fall 2020. 

POSTPONED: Workshop on Societally-Relevant Multi-Year Climate Predictions

Postponed

The Workshop on Societally-Relevant Multi-Year Climate Predictions has been postponed for a later date after August 2020. We are currently looking at availability of facilities and will inform participants of the new dates within the coming days.

Joint Variations/Exchanges edition on Sources and Sinks of Ocean Mesoscale Eddy Energy

Sources and Sinks of Ocean Mesoscale Eddy Energy cover

The 2020 winter edition of Exchanges and Variations, joint between International and US CLIVAR, is themed "Sources and Sinks of Ocean Mesoscale Eddy Energy," with guest editors Baylor Fox-Kemper, Brown University and Simon Marsland, CSIRO.