Array locations and simple schematic of water mass overturning transports
First-ever daily time series of the strength of the abyssal MOC cell in the South Atlantic

Kersalé, Meinen, and coauthors investigate the MOC flows at the southern end of the South Atlantic Ocean to evaluate the variability of the oceanic circulation across 34.5°S in the South Atlantic at all depths and at a daily frequency. This research highlights the first-ever daily quantification of the time-varying strength of the abyssal cell at 34.5°S, for which prior studies had only produced once-a-decade "snapshot" ship section estimates.

Composites of NOAA Climate Prediction Center precipitation in mm day-1 broken down by MJO phase for active MJO days for the November 2015 - April 2016 El Niño event.
US precipitation modulated by MJO-ENSO teleconnection interference

Subseasonal to seasonal climate forecasts in the US depends heavily on atmospheric and oceanic conditions in the tropical Indian and Pacific Ocean regions. While ENSO dominates seasonal predictability, the primary source of global predictability on subseasonal timescales is the MJO. To understand how ENSO and MJO interact, the authors isolated both MJO and ENSO signals and found that depending on the simultaneous location of the MJO convection and the background state of ENSO, the two signals can either enhance or mask each other.

Saildrone: Adaptively sampling the marine environment
Saildrone: Adaptively sampling the marine environment

To improve atmospheric and oceanographic monitoring, a new type of autonomous marine vehicle, the Saildrone, has been developed and deployed in over 40 cruises from which data are publicly available. Coupled with data from other sources such as satellites, Saildrone measurements could be useful for future algorithm and numerical model improvements, particularly at the fine spatial scale and in complex and previously data-sparse ocean regions.

 Sources of uncertainty in climate projections and their relative importance for different variables and regions.
Large Ensemble model simulations help to better quantify sources of uncertainty in climate projections

A new collection of single model initial-condition large ensembles (SMILEs) can test statistical assumptions with a cleaner separation between sources of uncertainty in climate projections. In particular, the potential bias at regional scales or for variables with a lot of internal variability can be greatly reduced.

Time of emergence of the anthropogenic signal in storm-related extreme sea level at New York in the GFDL CM4 simulations.
Elevated storm surge differs in origin along the US East and Gulf Coasts

Yin and coauthors use the new GFDL CM4 and CM4HR models to consider a series of climate change experiments under the CMIP6 protocol to study characteristics of extreme sea level events and their future evolution in a fully coupled weather, climate, sea level, and storm surge modeling system. They found that even in the absence of global warming, the Gulf Coast is most vulnerable to hurricane-induced storm surge.

A schematic of the transport structure across the Labrador Sea
Density compensation minimizes the impact of the Labrador Sea convection to the AMOC

Zou and coauthors analyzed the transport and property fields across the Labrador Sea using OSNAP observations and an ocean reanalysis dataset GloSea5 to study why recent observations revealed minimal contribution of the Labrador Sea convection to the subpolar AMOC strength. They found that the density compensation has important consequences on the strength of the overturning circulation.

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Arctic Circulation Workshop Blog

Arctic Circulation Workshop

In preparation for the Workshop on Observing, Modeling, and Understanding the Circulation of the Arctic Ocean and Sub-Arctic Seas, the organizing committee initiated an online topical community discussion to share perspectives in advance of the workshop.

2020 Call for new US CLIVAR working groups

Optional hike led by Large Ensembles Working Group members

Requests are now being accepted for new US CLIVAR-sponsored working groups for 2021. Submissions are encouraged from the US climate science community. All documents must be submitted by October 16, 2020. The next call for working groups will be in September 2021.

NEW DATES - Multi-Year Workshop

Multi-Year Workshop

The Workshop on Societally-Relevant Multi-Year Climate Predictions is now rescheduled for June 2-4, 2021. The plan is to hold this as an in-person meeting with opportunity for remote participation for those unable to travel. Registration and poster abstract submission will open again this fall for additional participants.

NEW DATES - US AMOC Science Team Meeting

US AMOC Science Team Meeting

Save the new dates for the US AMOC Science Team Meeting, scheduled for April 12-15, 2021 in Woods Hole, MA. Now in its final year, the Science Team invites colleagues from the US and international community to review progress over the past decade in observing, modeling, understanding, and predicting AMOC and to identify remaining priorities to guide future international collaborations in the decade ahead. Registration and abstract submission will open this fall.