schematic of megadrought teleconnections
Volcanic eruptions interact with El Nino events, affecting sustained ‘megadrought’

To improve estimates of risks associated with megadroughts, researchers look at improving the understanding of ENSO/AMO behavior, their teleconnections, and their response to volcanic eruptions in climate models.

Atmospheric river moisture transport
Origins of atmospheric river moisture traced in model

Researchers found that atmospheric rivers that impact the West Coast contain more tropical moisture than average, indicating that long-distance transport of tropical moisture does occur.

AMOC and AMV variability in different models
Underestimated AMOC variability in climate models has broad implications

Using both observations and simulations from multiple models, researchers show that most models underestimate the amplitude of low-frequency AMOC variability.

Hurricane Harvey and 2016 Louisiana Flood
Extreme event deja vu: Hurricane Harvey (2017) and Louisiana flood (2016)

Regional model simulations suggest that post-1980 warming in both the ocean and atmosphere resulted in an estimated 20% increase of the accumulated precipitation for Hurricane Harvey.

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. 

Welcome to the US Climate Variability and Predictability Program

Science at the 2018 International AMOC Meeting

Scientists listening at the 2017 AMOC meeting

On July 24–27, over a hundred scientists will gather to develop a better understanding of the Atlantic meridional overturning circulation (AMOC) and its influence on weather, climate, and ecosystems. You can glimpse some of the science being presented at the meeting via the digital poster gallery or reading an abstract. 

Exploring the interplay between ocean eddies and the atmosphere

map of ocean eddies

The organizers of a recent workshop, Ocean Mesoscale Eddy Interactions with the Atmosphere, published an article in Eos on the major outcomes and findings. The workshop drew more than 50 oceanographers and atmospheric scientists to assess the state of knowledge about ocean eddy–atmosphere interactions and to plan research.

CLIVAR-relevant sessions at 2018 AGU Fall Meeting

AGU abstracts

The 2018 AGU Fall Meeting will be held from December 10–14 in Washington, DC. In preparation for the meeting, we have compiled a list of sessions that are relevant to the community and organized by our Panels, Working Groups, and community members. The list of sessions is not intended to be exhaustive but to help digest the collection of the hundreds of sessions and events. The deadline for abstracts is August 1. 

Learn about Climate Process Teams

Internal ocean mixing CPT

For a decade and a half, US CLIVAR has promoted the concept of Climate Process Teams (CPTs). CPTs are a useful way to transfer process-oriented research into climate model development. The history of CPTs, key lessons from past efforts, and how to propose future projects are outlined on the website.

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. 

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. 

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.