Please select your home edition
Selden 2020 - LEADERBOARD

Five essential ocean-climate technologies

by The Woods Hole Oceanographic Institution 13 Nov 2022 16:38 UTC
An Argo float is deployed off the side of a research vessel © Argo Program, UC San Diego

It's hard to overstate how profound the ocean's role is when it comes to climate change.

It has absorbed more than 90 percent of the heat caused by greenhouse gasses since the Industrial Revolution, and it stores nearly one-third of the carbon dioxide (CO2) emissions we produce, staving off 4-6 degreesC (7.2-10.8 degreesF) of planetary warming. But as much as it benefits our climate, the ocean also suffers from its effects—problems like biodiversity loss, heatwaves, and ocean acidification. With this in mind, innovative technologies are needed to monitor changes in the ocean over time and help develop ocean-based solutions for our climate challenges.

From the poles to the ocean twilight zone, here are some of the most important tools WHOI scientists use to monitor the ocean's role in, and response to, climate change.

Argo floats

These free-drifting instruments measure a variety of parameters in the ocean that help researchers understand the ocean's response to climate change. This includes regional and global changes in ocean temperature and heat content, salinity and freshwater content, the height of the sea surface in relation to total sea level, and large-scale ocean circulation patterns. Typically deployed from ships, Argo floats autonomously travel from the ocean's surface to a depth of 2,000 meters (over 6500 feet) and back up again, getting a more complete profile of the upper and middle layers of the ocean. Visit here to see where Argo floats are currently measuring the ocean

Ice-tethered profilers

These large, bright-yellow surface buoys sit atop ice floes like construction barrels on a snow-covered highway, tracking ocean parameters around the clock. Hanging from each buoy is a weighted cable that dangles through an 11-inch-diameter hole in the ice and into the ocean. A motorized sensor package travels continuously up and down the tether through various layers of the ocean in yoyo-like fashion, taking continuous measurements of temperature, salinity, and other seawater properties along the way. Data from these profilers, combined with ship-based observations, give scientists the ability to quantify changes over the past several decades and have helped reveal the unexpected scale and speed of ocean warming.?

Chanos II

Chanos—which is short for The CHannelized Optical System— is an optical sensor that can make rapid measurements of the ocean's carbon chemistry, including Dissolved Inorganic Carbon (DIC) and pH. It can be deployed autonomously from docks, buoys, and mobile platforms like remotely operated vehicles (ROVs), reducing the costs associated with sending scientists out to sea to gather seawater samples. With it, scientists can make valuable observations of how the ocean's chemistry may be changing in response to climate change. For example, it can help determine the extent to which seawater is becoming more acidic as it absorbs increasing amounts of CO2 from the atmosphere.

The polar sentinel

It looks like a cruise missile with wings, and has bells and whistles that would excite any oceanographer attempting long-range under ice surveys. The Polar Sentinel is an AUV-glider hybrid that can travel thousands of miles below the surface of the Arctic Ocean to measure ice thickness, all with the power draw of a cell phone. Inside the vehicle's nose is a sonar system that provides an X-ray-like profile of the ice as it cruises several meters below the frozen surface. A high-efficiency thruster in the rear of the vehicle keeps the glider going across huge swaths of the ocean, and ensures that it stays ahead of the fast-moving ice pack. What's more, a Doppler sonar module provides navigational guidance based on the terrain of the seafloor.


Deep-See is a towable sensor platform that helps scientists estimate and identify the creatures of the ocean's twilight zone (OTZ), many of which help move CO2 from the surface to deeper waters. At the front of its Formula-1-sized frame are stereo cameras and two different kinds of sonar technologies that can scan and map the volume of life in the OTZ before it migrates to and from the surface waters.

Research vessels can tow Deep-See, while it glides at depths of up to 1,000 meters (3,000 feet). Underwater, samplers at its midsection can capture genetic information for species identification, while other sensors take chemical measurements of the water's pH, salinity, and more. An electro-optical cable sends all this information in real-time to scientists in the ship's wet lab—data that can inform policy makers and stakeholders about how to manage this ecosystem sustainably.

Related Articles

Pakistan's 'Ocean of Water'
Interactions between Pacific and Indian Oceans influenced devastating monsoon The South Asian monsoon brings much-needed rain to the Indian subcontinent each summer. The monsoon typically lasts from mid-June to September. Posted on 3 Feb 2023
Palau's Rock Islands harbor heat-resistant corals
Finding could help reef managers to develop new defenses against ocean warming Ocean warming is driving an increase in the frequency and severity of marine heatwaves, causing untold damage to coral reefs. Posted on 24 Dec 2022
When will Antarctica's ice come crashing down?
Researchers challenge their own assumptions to improve sea-level rise predictions As increased warming in Antarctica causes glaciers to retreat and shed their increasingly-unstable shelves, towering walls of ice are left looming high above the sea. Posted on 20 Nov 2022
Can we use sound to build back reefs?
What does a healthy reef sound like? What does a healthy reef sound like? And can we use that knowledge to help save sick or endangered reefs? Posted on 13 Nov 2022
What happens to natural gas in the ocean?
Methane, the most abundant hydrocarbon in natural gas, is a potent greenhouse gas When news broke on September 26 that natural gas pipelines had ruptured under the Baltic Sea, the immediate-and appropriate-concern was the impact on the climate. Posted on 11 Oct 2022
How to study an underwater earthquake from shore
Lessons from a successful hybrid Sentry expedition A magnitude 6 earthquake along the Gofar Transform Fault in the eastern Pacific Ocean shook the seafloor in April 2020, just when a WHOI-based science team predicted. Posted on 31 Aug 2022
Seven ways you can be coral reef-safe
Lifestyle changes you can make to help corals in crisis Diving or snorkeling on a reef is your ticket to a dreamworld. Brilliant colors, fantastic shapes, and castle-like structures invite exploration, revealing bright flashes of fish and an infinite variety of life below the surface. Posted on 4 Jul 2022
World's largest kelp map launched
By Woods Hole Oceanographic Institution and collaborators Kelp forests provide myriad benefits to nature and people in oceans around the world. They form the backbone of the ecosystems in which they are found, providing habitat and food for thousands of species. Posted on 13 Apr 2022
Dissolving oil in a sunlit sea
Scientists working to understand a concept known as environmental fate The 2010 Deepwater Horizon oil spill was the largest marine oil spill in U.S. history. The disaster was caused by an explosion on the Deepwater Horizon oil rig, taking 11 lives and releasing nearly 210 million gallons of crude oil into the Gulf of Mexico. Posted on 20 Feb 2022
The ocean twilight zone's role in climate change
WHOI releases report analyzing carbon sequestration in the mid-ocean region The ocean twilight zone, also called the mid-water or the mesopelagic, lies far beneath the sunlit surface waters, about 650 to 3,300 feet deep to be exact. Posted on 19 Feb 2022
Hyde Sails 2022 One Design FOOTERNoble Marine 2022 SW - FOOTEROcean Safety 2023 - New Identity - FOOTER