Expedition goal: The main objectives of this research expedition are: 1) fill observational gaps for carbon dioxide (CO2) chemistry along the Central California Coast to develop calibration routines for pH sensors on underwater gliders in this region; 2) determine the rate of acidification along this region of the coast over the past decade; 3) test the Digi-DIC, a new chemical analyzer for total CO2, developed in the chemical sensor lab at MBARI. This weeklong expedition will conduct three transects going 250 kilometers (155 miles) offshore, spanning from Monterey Bay to Point Conception.

Expedition dates: July 23- 29, 2019

Ship: R/V Western Flyer

Research technology:  CTD rosette, Spray underwater glider with Deep-Sea-Durafet pH sensor, Digi-DIC chemical analyzer

Expedition chief scientist: Yui Takeshita

The California coast is a hotspot for ocean acidification and hypoxia (low oxygen). This is because upwelling brings deep, low-oxygen and low-pH waters towards the surface. Over the last year, the Coastal Biogeochemical Sensing Group has worked to equip the Spray underwater glider with a pH sensor to better observe the acidification process along our coast. Gliders are autonomous platforms that profile down to 1,000 meters (3280 feet), and can be navigated from shore. They collect data as they rise to the surface, and then relay their data via satellite. They are particularly well suited to measure the coastal ocean. However, in order to routinely operate this new pH-technology, we need a calibration routine that can be easily implemented that does not rely on research vessels. We plan to take advantage of the fact that deep ocean waters are relatively stable and predictable, and calibrate the sensors at depth. Our goal is to determine how deep and how far offshore we need to go to conduct a reliable calibration.

Over the next six days, we will be collecting water samples down to 2,000 meters (1.25 miles) at approximately 20 stations spanning from Monterey Bay to Point Conception. Water samples will be analyzed onboard the ship, which we have equipped with our analytical instrumentation. We will also be testing prototype chemical sensors we have developed to measure total CO2. We are sailing with four students who have never been out to sea before, and we are very excited to provide them this opportunity!

 

About this expedition:

Eve Lundsten and Charlie Paull

A team of 11 from MBARI will be participating in an international research expedition on the Korean Polar Research Institute (KOPRI) icebreaker Araon from August 21 to September 17, 2022.  MBARI will be providing state-of-the-art autonomous underwater vehicles (AUVs) and a remotely operated vehicle (ROV) to study the seafloor under the Canadian Beaufort Sea along the southern edge of the Arctic Ocean. On this expedition we will investigate the effects of thawing submarine permafrost in this remote area of the Arctic Ocean.

 

Korea icebreaker Araon

Permafrost is ground that remains frozen throughout the year. Global warming has focused considerable attention on the decomposition of permafrost on land and its impact on shaping the landscape. In contrast, almost nothing is known about the decomposition of relict permafrost under the sea. The Arctic Ocean is rimmed by vast shallow areas, such as the continental shelf in the Beaufort Sea. During periods of low sea level associated with glaciation, these shallow areas have been periodically exposed to the frigid air temperatures suitable for permafrost formation. Because of the lack of moisture in the Arctic, this area was not blanketed in glaciers and therefore experienced mean annual air temperatures that were often -15°C (5° F) or colder. These cold air temperatures caused the development of thick permafrost. In contrast, when sea level rises during interglacial periods, as happened about 12,000 years ago, the permafrost is flooded by the relatively warm seawater. Because the permafrost here was so thick and the diffusion of heat was so slow, ancient Pleistocene permafrost bodies that are still 100’s of meters thick remain beneath the continental shelf of the Beaufort Sea, even after 12,000 years.

The first systematic high-tech mapping along the edge of the continental shelf of the Canadian Beaufort Sea was conducted in 2010. These maps revealed a band of unusually rough seafloor terrain along a 95-kilometer (59-mile) stretch of the shelf, roughly 180 kilometers (110 miles) offshore. This rough topography coincided with what was once the seaward edge of that relict Pleistocene permafrost. Sections of this topography were subsequently remapped multiple times using MBARI AUVs. These repeated surveys show that multiple new sinkholes have formed in this area over just a few years. The volume of the largest new sinkhole, developed in less than 9 years, is equivalent in size to a city block of 6-story apartment buildings. The rate of morphologic change associated with the decomposing relict permafrost seen here is among the most rapid seen anywhere on Earth.

Route that the Araon will take during the 2022 Arctic expedition. MBARI will be participating in the second leg (in red), from Utqiagvik to Nome.

Route that the Araon will take during the 2022 Arctic expedition. MBARI will be participating in the second leg (in red), from Utqiagvik to Nome.

On this upcoming expedition in August 2022, the MBARI science party will be boarding the Araon in Utqiagvik, Alaska (formerly Barrow), along with other researchers from Korea, Canada, and the US. From Utqiagvik, the Araon will transit east passing along the entire north shore of Alaska before entering into the study areas in Canadian waters.

MBARI is contributing to the expedition two AUVs that are designed to map the seafloor. These untethered, free-swimming robots will descend to and independently navigate over the bottom terrain to map the seafloor along pre-programmed routes. The AUVs carry multi-beam mapping sonars that collect data at a resolution that exceeds what can be collected with a ship mounted system. These highly-detailed maps help illuminate the processes that shape the seafloor and, when conducted at repeated intervals, reveal how dynamic areas like these change over time.

MBARI’s MiniROV will be used to explore and sample the freshly altered seafloor. This ROV was designed to be small and robust so that it could be easily shipped to remote ports, providing access to study areas beyond the west coast of North America. The MiniROV utilizes an articulated arm to collect water samples, sediment samples, and animals, while recordings from a high-resolution video camera provide insight about the precise context of their locations.

Pre-cruise preparations

Expeditions like this take years to plan and require an enormous amount of work from numerous people from all of MBARI’s divisions. Engineering efforts, permitting acquisition, funding agreements, and safety training all begin years before we can set foot on the boat. It is only with considerable organization, and a little bit of good luck, that it all comes together to allow us conduct the research of interest to our team.

Physical preparations for this expedition began at MBARI in the fall of 2021 with the building of new ROV control room specifically designed for this expedition. The space was fabricated within a 20-foot shipping container with just enough floor space reserved to house the two mapping AUVs during shipping.

Tests of the new ROV control room were conducted at sea in Monterey Bay through early 2022 to ensure everything worked prior to packing, which commenced in March 2021. Two additional shipping containers were needed to hold the MiniROV, the ROV winch, and other assorted equipment needed for the expedition.

Our three shipping containers had to make an arduous journey from Oakland, California to Korea before heading up to the Arctic. Transpacific shipping delays and backlogs left some of our gear behind­–fortunately, it caught the last possible ship, arriving in Busan, Korea, just in the nick of time. To our knowledge all the MBARI gear is safely stowed onboard the Araon, awaiting our arrival in Utqiagvik.

The two container ships which carried MBARI’s equipment to Korea.
 

Maritime safety training

MBARI staff enjoyed a unique experience completing a required 5-day safety training and survival class that included the basics of fighting fires, CPR, first aid, and at-sea survival. Far outside our normal routines as scientists and engineers, it had us in full fire fighter gear, donning a self-contained breathing apparatus to put out a fire in a confined space, and we had to practice jumping off a mock ship (a high dive) and flipping an overturned life raft. It was a wonderful experience that we hope to never have to use in real life.

Learning how to work as a team to advance on a fire during firefighting training.
Life raft flipping test.

Expedition Logs

Team

Collaborators

Jong Kuk Hong (Korean Polar Research Institute), Young Keun Jin (Korean Polar Research Institute), Tae Siek Rhee (Korean Polar Research Institute), Scott Dallimore (Geological Survey of Canada). Mathieu Duchesne (Geological Survey of Canada)