MOC time series at 34.5S
Dynamic and complex variability of the Atlantic Meridional Overturning Circulation at 34.5S

An international team of scientists used six years of simultaneous moored observations with satellite winds to produce a new MOC volume transport record for 34.5°S in the South Atlantic Ocean.

RAPID and MOVE arrays in the Atlantic Ocean
AMOC observations reveal coherent changes

Scientists have investigated differences between two arrays (at 16N and 26N) and found that both datasets show deep waters (below 1100 m) at the western boundary becoming fresher and less dense, but there remain discrepancies in the methods measuring ocean circulation. 

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.

Welcome to the US Climate Variability and Predictability Program

Variations Spring 2018: Expansion of the tropics

Variations cover

The most recent edition of Variations is themed "Expansion of the tropics" and focuses on the magnitude, cause, and impacts of the recent expansion of the tropical belt region. The articles present some of the most pressing research questions, ideas for standardizing methods, the role of anthropogenic and natural variability, and how widening varies by region with different impacts over land and the ocean.

AMOC Science Team Report

AMOC Science Team Report Cover, sea ice

In its 10th year, the US AMOC Science Team report captures progress on the main objectives of the program, identifies new programmatic gaps,  provides near- and long-term research priorities, and outlines activities leading up to the sunset of the team. 

TPOS 2020 workshop presentations and posters

TPOS 2020 workshop participants

Over 50 participants gathered in Boulder, Colorado, on May 1–3 to discuss pathways for bridging observations to data assimilation for understanding the tropical Pacific, as part of the TPOS 2020 project. The presentations and posters presented during the workshop are available online for viewing. A workshop summary and report will be forthcoming. 

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.

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. 

US CLIVAR celebrates 20 years

US CLIVAR 20th  anniversary

For the past 20 years, the US CLIVAR program has addressed some of the most pressing research questions to understand the climate system, particularly the great uncertainties related to the role of the ocean. To recognize the community and build on achievements, the program will host several events throughout the year.