There are papers that push boundaries, and then there are papers that quietly step over the line into something closer to speculative engineering fiction dressed up as policy relevance. The recent preprint titled “A Constructed Closure of the Bering Strait can Prevent an AMOC Tipping” falls squarely into the latter category. Published in March, this one has been getting a lot of press lately.
Let’s be clear about what is being proposed here: the physical closure of the Bering Strait—an ~80 km-wide ocean gateway between Alaska and Russia—using a series of dams, in order to manipulate large-scale ocean circulation and “stabilize” the Atlantic Meridional Overturning Circulation (AMOC).
Yes, really. So here is my point by point rebuttal of this madness.
The Setup: A Model Built on Assumptions
The authors rely on an Earth system model of intermediate complexity (CLIMBER-X), running at a coarse 5° × 5° resolution—a level at which the Bering Strait itself isn’t even explicitly resolved, but instead treated as a “baroclinic tracer exchange” between basins.
That alone should give pause.
In other words, the very mechanism they propose to physically shut down is not even directly simulated in a realistic way. The “throughflow” is parameterized, not dynamically resolved. Yet from this abstraction comes a conclusion about constructing one of the largest geoengineering projects in human history.
The authors do acknowledge discrepancies:
“The Throughflow’s strength in this model is not realistic…”
But then proceed as though the qualitative behavior justifies real-world intervention. That’s a leap, and not a small one.
The Contradiction: AMOC Panic vs. Ocean Tampering
Now here’s where things become particularly revealing.
For years, we’ve been told, often in apocalyptic tones, that the AMOC is on the verge of collapse. Headlines warn of imminent tipping points, ice ages in Europe, and irreversible climate disruption.
Yet in this same intellectual ecosystem, we now find proposals to deliberately interfere with global ocean circulation by blocking a major ocean gateway. Let’s quote the paper:
“We here propose as an intervention the construction of a Bering Strait Dam (BSD).”
So the same community that treats ocean circulation as a delicately balanced system—one that might collapse under modest freshwater perturbations, is apparently comfortable with physically cutting off a major inter-ocean exchange.
It’s difficult to reconcile those positions. One might say, well, they must be out of their minds.
If the AMOC is truly that fragile, why would anyone entertain shutting down a key component of the global ocean system? And if it’s robust enough to tolerate such interventions, then perhaps the whole AMOC collapse narrative deserves a second look.
The Model Says… It Depends
Even within their own framework, the results are hardly reassuring. The paper admits that closing the Bering Strait can either stabilize or destabilize the AMOC depending on conditions:
“For a weaker AMOC a closure reduces this budget.”
and:
“A closure that is too late… actually speeds up the AMOC’s collapse.”
So the proposed intervention in a nutshell:
- Might help
- Might do nothing
- Might make things worse
- Depends on timing, initial conditions, and model assumptions
This isn’t a control knob. It’s a crazy gamble. It belongs in Las Vegas or Polymarket, not in science.
Scale Matters: Engineering on a Continental Level
The authors attempt to normalize the scale of the project by comparing it to existing infrastructure:
“Construction challenges are on par with already completed mega-projects.”
This comparison is… ummm…generous. We’re talking about:
- An 80 km-long barrier
- In Arctic conditions
- Across an international boundary
- Interfering with global ocean circulation
- With poorly understood ecological consequences
Even the authors concede:
“We expect the BSD to have a large impact onto the regional ecosystem.”
That’s understated. The Bering Strait is not a canal—it is a biological and physical choke point connecting the Pacific and Arctic systems. Blocking it would alter:
- Heat transport
- Salinity distribution
- Nutrient flows
- Marine migration routes
And those effects would not remain “regional.”
The Missing Piece: Law of Unintended Consequences
What happens when you disrupt a global system in a targeted way? The paper focuses almost entirely on AMOC behavior. But the climate system is not a single-variable machine.
Consider just a few plausible consequences:
1. Arctic Amplification Changes
Blocking relatively fresh Pacific inflow could alter Arctic stratification, potentially affecting Arctic sea ice formation in unpredictable ways. Could be good for the climate doom business though.
2. Pacific Back-Reaction
Water that no longer enters the Arctic doesn’t disappear. It remains in the Pacific system, potentially altering circulation patterns there. Will it be warming up or cooling. Who knows?
3. Feedback Cascades
Ocean circulation is a complex coupled system. Change one gateway, and you risk:
- Shifting storm tracks
- Altering precipitation patterns
- Modifying ENSO behavior
4. Ecological Disruption
The Bering Strait is a major migration corridor for marine life. Blocking it introduces immediate biological consequences that are not remotely addressed in the modeling framework.
Final Thought
This paper fits into a growing trend: as climate projections become more alarming, proposed interventions become more extreme. Carbon capture. Solar radiation management. Now ocean dams. Each step moves further away from observation and closer to system-scale manipulation based on models that, even by their own admission, contain significant uncertainties. There’s a certain irony here.
We’re told that:
- The climate system is highly sensitive
- Small perturbations can trigger tipping points
- Uncertainty demands urgent action
And yet, in the same breath, we’re presented with proposals to re-engineer planetary-scale ocean circulation using coarse-resolution models that can’t even resolve the feature being modified. That’s not caution. That’s overconfidence untethered from evidence, or maybe the worst case of Dunning-Kruger syndrome ever.
Before anyone starts drawing up blueprints for an Bering Strait dam, it might be worth asking a simpler question:
If we don’t fully understand how the system works now, what exactly are we improving by forcing it to behave differently?
Next thing you know, some lunatic will say we need to block the sun. Oh, wait.
