Sensible heat and evaporation fluxes in the Arctic Ocean
Arctic sea ice reductions influence air-sea energy exchanges

Researchers conclude that changes in sensible heat transfer and evaporation fluxes — in response to strong regional trends in sea ice cover — are becoming increasingly consequential to Arctic climate variability and change.

Changes in SST variance of ENSO
Is El Niño really changing?

ENSO experienced a regime shift in the late 1970s, after which events become stronger and less frequent. Researchers now conclude that the regime shift did not occur by chance but was due to a “real” change in the ENSO system.

SST anomalies in the Southern Ocean
Teleconnections in the Southern Ocean

Using satellite observations from 1982–2017, researchers found that SSTs and global atmospheric teleconnection patterns are significantly correlated to both the Antarctic and the Southern Oscillations.

distribution of heat waves and when climate change is projected to become the dominant cause of heat waves in the continental US
Emergence of a climate signal in US heat waves

Climate change will drive more frequent and extreme summer heat waves in the western US by late the 2020s, the Great Lakes region by the mid-2030s, and in the northern and southern Plains by the 2050s and 2070s, respectively.

hurricane intensity
Causes of the weak relationship between tropical Atlantic sea surface temperature and hurricane intensification

Research shows that SST may explain a significantly smaller percentage of the variance in tropical cyclone intensification in the Atlantic as compared to the western North Pacific and eastern-central Pacific.

ecadal-scale correlations between northern Gulf of Mexico and global sea surface salinity and continental preciptiation
Precipitation and ocean circulation changes linked during the Little Ice Age

Researchers show that weakened surface ocean circulation coincides with precipitation during the Little Ice Age and is consistent with little-to-no changes in the larger Atlantic meridional overturning circulation. 

Welcome to the US Climate Variability and Predictability Program

New water isotopes working group begins

Kim Cobb and Jordan Watson drill a coral core Credit: Zafer Kizilkaya

The US CLIVAR Working Group on Observations and Modeling of Water Isotopes in the Climate System was formed in April 2018 and will wrap up in three years. The intent of the working group is to is to characterize and utilize water isotope ratios as a climate variable. 

Process Study webinar series for 2018

cloud convection

The PSMI Panel is organizing a webinar series on proposed and current process studies starting in April 2018. The goals of this series are to provide feedback on the process study/field campaign plans and distill programmatic lessons learned. The webinars are open to the entire community. 

White paper on Arctic change and mid-latitude connections

Arctic white paper report cover image

Members of a US CLIVAR Working Group and a recent workshop have published a white paper on Arctic change and possible influence on mid-latitude climate and weather. This report brings together experts in the fields of atmospheric, oceanic, and cryospheric sciences to assess the rapidly evolving state of understanding, identify consensus on knowledge and gaps in research, and develop specific actions to accelerate progress within the research community.

Southern Ocean Working Group releases metrics paper

Annual-mean zonal wind stress from reanalysis, state estimation, and several of the coupled climate models

The US CLIVAR/OCB Southern Ocean Working Group published a paper on observationally based metrics that help standardize the evaluation of climate models and reduce the uncertainty in projections in the Southern Ocean.

New large ensemble working group begins

Large ensemble map of precipitation

The US CLIVAR Working Group on Large “Initial-Condition” Earth System Model Ensembles was formed in March 2018 and will wrap up in three years. The intent of the working group is to spearhead a dedicated effort across the national and international climate communities to advance progress on identifying anthropogenic influences on weather and climate amidst the “noise” of internal variability. 

Joint Variations/Exchanges edition on sea level rise

sea level rise cover photo

The 2018 winter edition of Exchanges and Variations, joint between International and US CLIVAR, is themed "Sea Level Rise," with guest editor John Church, University of New South Wales. The issue discusses the latest research, evaluation of predictability, analysis of extreme events and surface waves, and examples of the impacts.

Welcome new SSC and Panel members

US CLIVAR summit participants

US CLIVAR welcomes new members to the leadership team and panels, who will help shape the science planning and implementation of program goals. 

Contribute a testimonial celebrating US CLIVAR

Researchers discussing science during a US CLIVAR workshop

In recognition of 20 years of advancing climate research, US CLIVAR is seeking testimonials from the community and agency sponsors who have helped shape the program. Read what the community has to say and please consider sharing your testimonial.