Atlantic hurricanes
Atlantic overturning circulation and the recent decline of Atlantic major hurricane frequency

Using observations and a coupled Earth system model, a new study shows that the decline of the Atlantic major hurricane frequency during 2005–2015 is associated with a weakening of the AMOC.

Observed ocean-atmosphere anomaly patterns during multi-year La Niña event
Impact and predictability of multi-year La Niña events

New findings could improve our ability to predict both the strength and duration of US droughts caused by La Niña.

A Southern Ocean polynya
Modeling multidecadal cycles of Southern Ocean convection

Researchers observed a natural, regular, multidecadal oscillation between periods of Southern Ocean open-sea convection, which can act a release valve for the ocean’s heat, and non-convective periods.

monthly-mean analysis of oxygen isotopes in precipitation and gross primary productivity
Ice-core evidence for southward shifts of tropical rainfall in response to iceberg discharge during the last glacial period

The most extreme increases in the oxygen 18-to-16 ratio over the last fifty thousand years occur immediately after Heinrich events, strongly suggesting that tropical rainfall shifted south in response to Heinrich events.

Modes of Hadley Cell and ENSO
Finding parallels between Hadley Cell expansion and the global warming hiatus

As the decadal ENSO cycle transitions to a warm phase, a new study expects accelerated global warming and a “hiatus” in Hadley Cell expansion. 

Arctic sea ice decline
Understanding the effect of Arctic sea ice decline on the Atlantic meridional overturning circulation

The Arctic sea ice decline may explain the suggested slow-down of the Atlantic meridional overturning circulation and the persistence of the Warming Hole.

Welcome to the US Climate Variability and Predictability Program

US CLIVAR welcomes Dan Vimont as new chair of SSC

Dan Vimont, University of Wisconsin

Dan Vimont, University of Wisconsin-Madison, will serve as the new chair of the US CLIVAR Scientific Steering Committee (SSC) through 2018. The SSC chair directs US CLIVAR activities by advancing the Science Plan, identifying new opportunities for engagement, and serving as an ambassador for the program. 

Abstracts due Feb 28 for AMOC-RAPID International Meeting

NOAA pier

On July 24-27, 2018, scientists will join together to exchange ideas and develop a better understanding of the Atlantic meridional overturning circulation (AMOC) and its influence on weather, climate, and ecosystems. The meeting will take place in Coconut Grove, Florida. Abstract submissions are due February 28. 

Call for new US CLIVAR Panel members

US CLIVAR Summit

The US CLIVAR Scientific Steering Committee seeks qualified individuals to serve on its three subsidiary panels beginning in 2018. Panel members formulate science goals and implementation strategies, catalyze and coordinate activities, and work with agencies and international partners to advance the progress of the climate research community. Nominations or self-nominations are due January 3, 2018. 

Variations: Frontiers in western boundary current research

variations cover

Western boundary current regions are often studied for their intensity of air-sea interaction and mesoscale variability, yet research addressing the implications of these characteristics for biogeochemical cycling has lagged behind. This latest edition of Variations, joint with US OCB, features articles discussing some of the most pressing research questions. 

US CLIVAR Summit Report

summit report cover

The 2017 US CLIVAR Summit brought together over 80 members of the community for three days to review progress, identify opportunities, and develop strategies to advance program goals under the direction of the Science Plan. 

Contribute a research highlight

Finding parallels between Hadley Cell expansion and the global warming hiatus

US CLIVAR aims to feature the latest research results from the community. Check out the collection of research highlights and sort by topic. 

IV International Conference on El Niño-Southern Oscillation

El Nino

Abstracts are now being accepted for an international conference on ENSO in a Warmer Climate. The goal of the conference is to review progress on the science of ENSO with a focus on examining the range of ENSO “flavors.”