Latest research suggests AMOC may not collapse after all

### Why AMOC May Not Collapse After All

[Recent research](https://www.science.org/doi/10.1126/science.adh8369) has provided new insights into the potential fate of the Atlantic Meridional Overturning Circulation (AMOC), including the Gulf Stream, suggesting that a collapse may not be imminent despite ongoing climate change. This reevaluation is based on a “tug-of-war” between two types of melting from the Greenland Ice Sheet: iceberg calving and runoff.

#### Key Findings

1. **Runoff Mitigation**:
– Researchers have discovered that runoff from Greenland’s coasts could counteract the disruptive effects of iceberg calving on ocean currents. This runoff, although contributing to fresh water influx, also helps reduce the production of icebergs.

2. **Historical Context**:
– During the last ice age, significant iceberg discharges, known as Heinrich events, weakened the AMOC dramatically. However, current ice sheet melting and iceberg calving, despite high rates, may not produce the same effect due to the mitigating influence of runoff.

3. **Present Day vs. Past**:
– Unlike past events, today’s AMOC has not shown significant slowdown and remains in a relatively healthy state. The current climate conditions and the relationship between iceberg calving and runoff create a complex interplay that appears to prevent the severe weakening of the AMOC.

#### Researchers’ Perspective

Yuxin Zhou, the study’s lead author, highlights that the decelerating ice discharge and accelerating runoff are the main factors in this balance. The study, published in the journal Science, suggests that this tug-of-war could maintain the AMOC’s strength in the near term.

#### Caution from Other Scientists

Despite these optimistic findings, some scientists urge caution. David Thornalley, a professor of ocean and climate science at University College London, points out that the present-day ocean-atmosphere climate system differs significantly from that of the last ice age. He emphasizes that the models and assumptions based on historical data may not fully capture current dynamics, suggesting that the modern AMOC could still be vulnerable.

#### Future Outlook

The study concludes that while the AMOC is unlikely to be severely weakened before 2100, continued research and monitoring are essential. The ongoing investigation into the interactions between iceberg calving, runoff, and other climate factors will be crucial to understanding the future behavior of these critical ocean currents.

This research underscores the importance of the precautionary principle in climate science, advocating for proactive measures to mitigate potential adverse impacts on the AMOC and the global climate system.