Dye tracer released from the Beaufort Gyre region of the western Artic Ocean indicates freshwater transport through the Canadian Arctic Archipelago into the western Labrador Sea, causing freshening there
Record-high Beaufort Sea freshwater content could alter local and global ocean circulations

The Beaufort Sea increased its freshwater content by 40% over the past two decades. How and where this water will flow into the Atlantic Ocean is important for local and global ocean conditions. Zhang and colleagues simulated ocean circulation and tracked the Beaufort Sea freshwater’s spread during a historical release episode from 1983 to 1995.

High correlations between the mean double-ITCZ and future precipitation changes were identified in the US Southwest and Mediterranean Basin.
Models with corrected double-ITCZ projected drier winters for the US Southwest

Climate models generally project wetter winters for the US Southwest under global warming. Dong et al. discovered a strong relationship between a common model bias with future precipitation changes over this region. More specifically, models with excessive double-ITCZ biases tend to exaggerate the future precipitation increase.

Are long-term changes in mixed layer depth influencing North Pacific marine heatwaves?
Are long-term changes in mixed layer depth influencing North Pacific marine heatwaves?

A new study by Amaya and co-authors in the Special “Explaining Extremes of 2019 from a Climate Perspective” Issue of BAMS now reveals that the record thin ocean mixed layer depth (MLD) that drove a Blob 2.0 in the northeast Pacific Ocean was exacerbated by a multi-decadal shoaling of the mean MLDs in this region since 1980.

Recent trends in the warm-season 500-hPa vertical velocity over 1979-2014
Contrasting recent and future changes in the Intertropical Convergence Zone

Under global warming, the ITCZ is projected to shift towards the equator, leading to squeeze in the annual-mean tropical ascent and far-reaching impacts on global circulation. Zhou and coauthors researched the observed and projected ITCZ changes based on a variety of observation and reanalysis datasets and ensemble projections of climate models, and found that the observed ITCZ changes are largely opposite to the projected future changes.

Spatial distribution of two widespread precipitation events that occurred on 8 May 1995 and 13 September 1961 and geometric illustration of the extent of an SHPE on the ground
Understanding the spatial structure of simultaneous heavy precipitation events over the conterminous United States

Najibi, Devineni, and co-authors present a new idea defined as simultaneous heavy precipitation events (SHPEs) to quantify extreme regional precipitation considering the spatial structure of extreme events. Quantifying the characteristics of SHPEs and modeling their footprints can improve the projections of flood risk and understanding of damages to interconnected infrastructure systems.

Uncertainty for drifter GMSL and GMSL trend estimates
Can we measure global mean sea level with an array of drifting buoys?

In a recently published Geophysical Research Letters paper, Elipot demonstrates how a new ocean observing system for measuring local and global sea level changes could piggy-back on the existing array of freely drifting buoys. Development and implementation of such sea level measurements could ultimately provide an independent and resilient observational system to infer natural and anthropogenic sea level changes, augmenting the ongoing tide gauge and satellites records.

Welcome to the US Climate Variability and Predictability Program

A Window to the Future: Why Greenland’s Continental Shelves Hold the Reins of Its Melting Glaciers

A cutaway diagram of a typical Greenland glacier in its fjord

Over the last two decades, researchers have established a clear connection between ocean conditions on the continental shelf and the behavior of Greenland’s more than 200 marine terminating glaciers. But there is still no comprehensive system for monitoring these changes over the long term—such as the one proposed by Straneo et al. (2019)—and it is desperately needed. Check out the new Arctic Ocean Circulation Workshop blog by guest authors Josh Willis, Michael Wood, and Ian Fenty.

Workshop on Future US Earth System Reanalysis

Reanalysis Workshop Flyer

The Workshop on Future US Earth System Reanalysis aims at developing a shared scientific, technological, and application vision for the future of the US reanalysis efforts over the next 5-10 years. Registration and abstract submission will open this summer.

Save the date: GO-BGC Virtual Workshop

Virtual Workshop on the New Global Ocean Biogeochemistry (GO-BGC) Array

Building a Community of Biogeochemical Float Data Users: The GO-BGC array is a 5-year effort funded by NSF to deploy 500 profiling floats eqiupped with biogeochemical sensors in the world ocean. To inform and engage a broad oceanographic user community, US CLIVAR is teaming up with OCB and GO-BGC leadership to plan a virtual workshop from June 28-30, 2021.

Spring 2021 call for US CLIVAR-supported workshops

Spring 2021 call for US CLIVAR-supported workshops

Requests are now being accepted for US CLIVAR-sponsored workshops. Submissions are encouraged from the US climate science community and their collaborators. All documents must be submitted by April 23. The next call for workshops will be in fall 2021.

Tropical Pacific Observing Needs Workshop: Agenda now available

Tropical Pacific Observing Needs Workshop Flyer

The agenda for the virtual 2021 Tropical Pacific Observing Needs Workshop (May 24-26, 2021) is now available. Do not forget to register by May 17.