Category: Oceans

Ocean in Peril: Understanding the Escalating Threat of Marine Heatwaves and Acidification

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Ocean sea life and coral reef. Credit: Francesco Ungaro, Unsplash.


As the planet grapples with climate change, our oceans are experiencing unprecedented shifts. Recent research by Joel Wong, Matthias Münnich, and Nicolas Gruber, Column‐Compound Extremes in the Global Ocean published in the Journal of Oceanic Studies into the increasing frequency, intensity, and spatial extent of compound marine extremes—particularly marine heatwaves combined with ocean acidification—highlights a looming crisis for global marine ecosystems. The study, conducted over nearly six decades, offers important insights into these phenomena and underscores the urgent need for global environmental strategies.

The Escalating Intensity of Marine Extremes

The study analyzes data from 1961 to 2020, revealing a concerning trend in the behavior of oceanic compound extremes, referred to as Column-Compound Extreme Events (CCX). These events, characterized by simultaneous occurrences of extreme heat and acidity, have become more intense and longer-lasting over the years. Such changes are primarily driven by global warming and increased carbon dioxide emissions, which not only warm but also acidify ocean waters at alarming rates.

Impact on Marine Life

The effects of these compound extremes are profound. Marine ecosystems, particularly coral reefs, kelp forests, and the myriad species dependent on them, face severe threats from prolonged exposure to extreme conditions. The study estimates that the habitable space within the water column has potentially reduced by up to 75%, a stark indication of the dire conditions many marine organisms now endure. This habitat compression threatens biodiversity, disrupts fishing industries, and jeopardizes the livelihoods of communities dependent on these ecosystems.

Geographic and Vertical Spread

The research identifies that these extremes are not uniformly distributed. Tropical and high latitude regions, known for their rich biodiversity, are the most affected. The impacts extend beyond the surface, complicating the survival conditions for species that cannot migrate to more hospitable waters.

Role of Climate Phenomena

El Niño and other climate phenomena play a significant role in modulating these compound events. The study highlights specific patterns and regional variations in CCX occurrences, linking them to broader climatic shifts that influence ocean currents and temperature distribution.

Need for Advanced Modeling Techniques

A key contribution of this research is the development of advanced models that enhance our understanding of CCX characteristics and drivers. These models are crucial for predicting future changes and implementing effective conservation strategies. They also serve as a vital tool for policymakers and environmental planners as they prepare to mitigate the effects of these changes.

Summing Up

The findings from the study serve as a clarion call for immediate action. Protecting our oceans from compound extremes requires global cooperation and innovative solutions aimed at reducing greenhouse gas emissions and enhancing marine conservation efforts. This research provides a foundation for understanding the scale of the problem and outlines the critical areas for needed interventions.

The preservation of marine biodiversity and the sustainability of our global ocean ecosystems depend on our ability to respond effectively to the challenges posed by climate change. Through informed policy-making and collaborative international efforts, there is hope for mitigating the impact of these profound marine disturbances.

Source: Wong, J., Münnich, M., & Gruber, N. (2024). Column‐Compound Extremes in the Global Ocean. Journal of Oceanic Studies, 5(3). https://doi.org/10.1029/2023AV001059.

Earth Day, A Call to Action for Our Planet

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Blue Marble 2000. Credit: NASA, Image created by Reto Stockli with the help of Alan Nelson, under the leadership of Fritz Hasler. CC 2.0.

Earth Day, observed on April 22, is a global movement focused on protecting our planet. This year, as the collective acknowledgment of environmental degradation’s profound impact, we are also presented with an opportunity to champion a cause that could significantly alter the course of our environmental future—the Global Plastics Treaty.

Origins & Significance of Earth Day

Earth Day first emerged in 1970, initiated by Senator Gaylord Nelson after witnessing the catastrophic effects of an oil spill in Santa Barbara. The first Earth Day mobilized 20 million Americans and led to the creation of significant environmental policies and the Environmental Protection Agency (EPA). Today, Earth Day engages millions of people worldwide in activities aimed at preserving our planet, underscoring the power of collective action in tackling global challenges.

Why Earth Day Matters

Earth Day is crucial for several reasons:

  • Environmental Education: It raises awareness about pressing environmental issues and promotes sustainable practices.
  • Global Solidarity: Earth Day unites people across the globe, emphasizing that environmental stewardship is a shared responsibility.
  • Action and Advocacy: The day inspires individuals and organizations to engage in activities that protect the environment, from local clean-ups to global initiatives.

Earth Day 2024: End Plastic Pollution

The theme for Earth Day 2024 is the urgent need to combat plastic pollution. Plastics, particularly single-use plastics, are a severe threat to the environment, filling our oceans, killing wildlife, and disrupting ecosystems. The focus is on reducing plastic production by 60% by 2040 and eliminating single-use plastics by 2030.

The Urgent Call for the Global Plastics Treaty

In conjunction with Earth Day’s efforts, there is a significant push for the Global Plastics Treaty, a comprehensive international agreement aimed at tackling plastic pollution globally. With over 14,905 signatures, this petition calls on the United Nations and government organizations to adopt stringent measures against plastic pollution, including:

  • Reducing fossil fuel-based plastic production by 60% by 2040.
  • Holding producers accountable for environmental and health-related damages.
  • Banning plastic waste exports and incineration.
  • Promoting innovation in alternatives to plastic.

If we do not change our current habits, we will see a rise in hormonal diseases, cancers, and cardiovascular damage linked to the production and consumption of plastics. However, this bleak future is not inevitable; we have the ability to redirect our path and avoid this looming crisis.

How You Can Help

This Earth Day, let your actions speak louder than words:

  • Sign the Global Plastics Treaty Petition: Join the global movement to push for a binding international agreement that addresses plastic pollution head-on.
  • Reduce, Reuse, Recycle: Make personal changes to minimize your plastic usage.
  • Participate in Community Actions: Engage in local Earth Day events that focus on cleaning up and reducing plastics and help spread the word.

Final Thoughts

Celebrating Earth Day means committing to protect our planet continuously. By supporting initiatives like the Global Plastics Treaty, we can take significant steps towards a sustainable future free from plastic pollution. This Earth Day, let’s not just celebrate our planet; let’s take concrete steps to save it. Together, we can make a difference, but only if we act now. Join the movement, sign the treaty, and be part of the solution. We have the power to change our environmental destiny and ensure a healthier planet for future generations.

Our goal is not just an environment of clean air and water and scenic beauty. The objective is an environment of decency, quality and mutual respect for all other human beings and all living creatures.

—Gaylord Nelson

Understanding the Impact of Climate Change on Marine Mammals

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Mother and baby sperm whale
A mother sperm whale and her calf off the coast of Mauritius. The calf has remoras attached to its body. Credit: Gabriel Barathieu, January 26, 2013.

Our oceans are suffering the impact of climate change. From inshore environments to the deep ocean, marine ecosystems are undergoing significant transformations due to rising temperatures, increased carbon dioxide levels, and shifting environmental conditions. This research article by National Oceanic and Atmospheric Administration (NOAA) researchers published in PLOS ONE delves into the intricate relationship between climate change and marine mammals. The study focused on the United States’ western North Atlantic (WNA), Gulf of Mexico (GOMx), and Caribbean waters.

Drivers Impacting Marine Life

Global climate change has ushered in a multitude of alterations that stem from a handful of key drivers. Rising levels of heat and carbon dioxide in the Earth’s atmosphere are at the forefront. Here’s a closer look at the other major factors:

1. Increasing Ocean Temperatures

As the Earth’s temperature rises, so too do the temperatures of our oceans. This phenomenon is particularly evident in the western North Atlantic (WNA), where sea surface temperatures have been increasing rapidly. These rising temperatures have direct and indirect consequences for marine mammals that call these waters home.

2. Rising Sea Levels

One of the most visible effects of climate change is the rise in sea levels. This phenomenon is especially pronounced in regions like the southeastern United States, Gulf of Mexico (GOMx), and the Caribbean Sea. The accelerating sea level rise poses a significant threat to coastal ecosystems and the marine life they support.

3. Decreasing Dissolved Oxygen

Climate change also contributes to declining levels of dissolved oxygen in our oceans. This is a particularly alarming trend for marine mammals, as many of them rely on oxygen-rich environments to thrive.

4. Declining Sea Ice Coverage

In polar regions, the decline in sea ice coverage is a stark indicator of climate change. This has profound implications for marine mammals like polar bears and seals, which depend on sea ice as a platform for hunting and resting.

5. Ocean Acidification

The increasing levels of carbon dioxide in the atmosphere are not only raising temperatures but also leading to ocean acidification. This can have devastating effects on marine life, particularly species with calcium carbonate shells or skeletons.

6. Shifting Precipitation Patterns

Climate change also drives changes in precipitation patterns, impacting the salinity of ocean waters. These shifts can have cascading effects on marine ecosystems and the species that inhabit them.

Impacts on Marine Mammals

The effects of climate change are not limited to the physical environment; they also dramatically affect marine communities, including marine mammals. Here are some of the key ways in which climate change impacts these majestic creatures:

1. Altered Distribution and Behavior

Marine mammal species with restricted geographical distributions and habitat tolerances are particularly vulnerable. The changing conditions of their environment leave them with limited opportunities to adapt.

2. Disrupted Prey Availability

Marine mammals rely on stable environments where prey availability is relatively predictable. Climate change can disrupt these ecosystems, leading to food scarcity and challenges in feeding.

3. Climate-Related Shifts in Distribution

Some marine mammal populations, such as ice-associated seals and subarctic cetaceans, have already shown shifts in distribution due to climate change. These changes have significant implications for their conservation and management.

4. Predictive Challenges

Predicting climate-driven changes in marine mammal distribution, phenology, and abundance is a complex task. However, advancements in modeling tools and approaches are improving our ability to make informed predictions.

Assessing Climate Vulnerability

Understanding the vulnerability of marine mammals to climate change is crucial for their conservation. Climate vulnerability assessments (CVAs) play a pivotal role in identifying species at risk. These assessments take into account factors such as exposure, sensitivity, and adaptive capacity.

Trait-Based CVAs

One approach to CVAs involves trait-based assessments, which consider the biological or ecological traits of species that are linked to climate responses. While this method provides less resolution than quantitative approaches, it offers a rapid and adaptable way to assess vulnerability.

NOAA’s Role in Marine Mammal Protection

In the United States, the NOAA has a mandate to protect and recover marine mammal species under the Endangered Species Act (ESA) and Marine Mammal Protection Act (MMPA). To address climate-related threats to marine mammals, NOAA conducts trait-based CVAs for stocks in the WNA, GOMx, and Caribbean waters.

Conclusion

Climate change presents a profound challenge to marine mammals in the United States’ WNA, GOMx, and Caribbean waters. It is a complex issue that requires a multifaceted approach to address. As the world grapples with the consequences of a changing climate, it is imperative that we prioritize the conservation and protection of these incredible creatures. NOAA’s efforts, including trait-based CVAs and vulnerability rankings, provide valuable tools for understanding and mitigating the effects of climate change on marine mammals.

By comprehensively assessing vulnerability and taking proactive measures, we can work towards safeguarding the future of our marine mammal populations.

Source: Lettrich, M.D. et al. (2023). Vulnerability to climate change of U.S. marine mammal stocks in western North Atlantic, Gulf of Mexico, and Caribbean. PLoS ONE, 18(9), e0290643.