Why Are Oceans Becoming Darker? Exploring the Global Changes in Ocean Color

Estuaries along the coast of Guinea-Bissau branch out like a network of plant roots, with the river transporting water, nutrients, and sediment toward the Atlantic Ocean. This Landsat 8 image captured on May 17, 2018, showcases the movement of sediment, particularly visible on the Rio Geva near Bissau.

At dusk, a massive transfer of biomass occurs in the oceans, as trillions of tiny creatures like zooplankton, krill, and lanternfish rise from the depths, drawn by phytoplankton blooms. This nocturnal feeding frenzy is crucial for marine ecosystems, as these creatures avoid predators who hunt visually, diving back down at dawn.

Solar and lunar cycles dictate marine behavior, yet recent observations show that large areas of the ocean have darkened. Tim Smith, a marine scientist at the Plymouth Marine Research Institute, has been at the forefront of this research, studying the impact of global warming and land-use changes on ocean light dynamics.

Smith told New Scientist about the causes and implications of ocean darkening, exploring ways to enhance light penetration into underwater habitats.

Thomas Luton: How did you first notice the darkening of the ocean?

Tim Smith: We approached this issue from a unique perspective. For the last decade, I’ve collaborated with Tom Davis, focusing on the effects of artificial light pollution. Analyzing two decades of global satellite data revealed a consistent darkening pattern in the ocean, suggesting an increase in surface water opacity which affects well-connected expansive regions rather than isolated patches. About one-fifth of the world’s oceans have experienced some form of darkening.

What causes ocean darkening?

In coastal areas, river changes significantly impact ocean coloration. Alterations in land use directly influence what enters rivers, thereby transforming the optical properties of ocean water. Flood events can greatly increase the influx of suspended particulates and colored dissolved organic matter, contributing to the characteristic “steeped tea” color.

An additional driver of ocean darkening is nutrient loading, where fertilizers from agricultural runoff stimulate phytoplankton growth, reducing light penetration. Although coastal waters have been recognized as darkening for some time, the phenomenon is now extending into the open ocean.

Tim Smith studies the impact of land-use change and global warming on ocean dynamics.

Krave Getsi

What factors lead to changes in the open ocean?

These changes may correlate with the abundance of phytoplankton driven by climate change, such as rising ocean temperatures and increasing frequency of marine heatwaves. Climate alterations influence vast ocean circulation patterns significantly.

The proliferation of phytoplankton relies on a mix of light, nutrients, temperature, and water column dynamics. In winter, storms typically mix the ocean, but as spring arrives, a stable surface layer forms. These layers limit vertical mixing and enhance light and nutrient concentration, fostering phytoplankton growth.

I suspect that we’re witnessing a complex interplay between shifts in global circulation patterns and localized weather phenomena, such as clearer skies that promote phytoplankton growth. This combination may contribute to the widespread darkening of the open ocean.

What impacts does ocean darkening have on marine ecosystems?

To understand this better, consider the ocean’s food chain. Phytoplankton, the primary producers, experience the first effects of darkening. The next tier includes zooplankton, like Calanus copepods, which serve as a critical link in the food web and engage in diurnal vertical migration, moving up and down daily for feeding.

Zooplankton are a key component in the food web adversely affected by ocean darkening.

Flor Lee/Getty Images

During the day, they dive to depths of 200 to 300 meters where light is scarce, eluding visual predators. By night, they ascend in search of food. This behavior represents the largest biomass transfer on Earth, as millions of zooplankton migrate invisibly through the water, significantly outnumbering the terrestrial migrations like the Serengeti wildebeest.

What occurs when light cannot penetrate deep underwater?

The existence of dark regions in the ocean restricts the vertical habitat for species, which could lead to heightened competition for food and space. Some species may expend less energy hunting, impacting predation dynamics and thus altering food webs and global fishery productivity.

Fish species that rely on sight, including both small schooling fish and large predators like tuna, will find their hunting zones confined to the shallows. Simultaneously, phytoplankton may face altered depths for photosynthesis due to decreasing light availability.

Is nighttime ocean darkness still a concern?

Absolutely. Beyond sunlight, moonlight plays a crucial role in nocturnal migrations of many marine creatures. While the ocean appears nearly black at night to humans, the moon’s dim glow has significant implications for guiding species during foraging and return to deeper waters.

Our lunar models indicate that as ocean clarity decreases, moonlight’s penetration diminishes, which may compress the nighttime habitat, dramatically shifting ecological interactions in darkness.

What is the global impact of these changes?

Ocean darkening could profoundly affect the carbon cycle as well. If zooplankton cannot dive as deeply to evade predators due to limited light, their efficiency in pulling carbon from the atmosphere diminishes. When zooplankton perish, they normally sink and trap carbon deep in the ocean; without the ability to dive, much of this carbon may remain in the upper layers, ready to be re-released into the atmosphere.

However, assessing how carbon moves from the illuminated surface to the ocean floor remains complex. Satellite data provides a global perspective, but it offers only a glimpse into dynamics at work.

Is there a way to combat ocean darkening?

In certain areas, yes. Coastal waters are especially vulnerable to terrestrial activities, particularly agricultural runoff. By managing land better, including practices such as reducing fertilizer usage, we could restore some clarity to coastal waters. Initiatives like the AgZero+ program led by the UK Center for Ecology and Hydrology encourage collaborative efforts with farmers to develop eco-friendly farming techniques, thereby minimizing runoff and enhancing water quality. Strategies like improved fertilizer management and agroforestry could substantially mitigate the darkening of coastal waters.

Nevertheless, addressing the drivers of darkening in the open ocean is far more challenging. Even if global emissions halt immediately, ecological responses would take decades, potentially centuries.

Is there hope for the seas?

Absolutely. Evidence shows that marine environments can exhibit remarkable resilience when given a chance. Protected marine ecosystems can recover swiftly. For instance, kelp forests off California rebounded rapidly in well-managed reserves after a severe marine heatwave between 2014 and 2016.

This resilience has led to a global push to expand marine protected areas, which can act as ecological refuge zones, helping to rebuild vital marine life and restore ecological equilibrium. Such measures are crucial in the face of climate stressors like heatwaves.

There is optimistic news: the ocean exhibits extraordinary self-repair capabilities. With adequate protection and time, marine ecosystems can respond swiftly, crucial for all life on Earth. The oceans, covering about 70% of the planet, play a significant role in climate regulation and carbon absorption, underscoring the need to protect this invaluable life-support system.

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Source: www.newscientist.com

The Soaring Popularity of Cozy Video Games: Will They Unveil a Darker Side? | Games

IN 2017, ThinkTank, a game design initiative known as Project Horseshoe, convened a group of developers to explore the delightful concept of video games. Since the inception of the medium, games with non-violent themes have existed. Early life simulators like Little Computer People from 1985 represented low-stake interactions, allowing players to engage with ordinary characters in their homes. Following the 1996 Chibi Award harvest, social farming simulations gained popularity.

The report produced, Cozy Games: Exploring Safety, Softness, Satisfied Needs, may represent the first systematic effort to delineate the genre. The group identified three core components: safety, richness, and softness. Cozy games (with the American spelling) avoid high-stake scenarios. “There’s no looming threat of loss,” they noted. They are designed to evoke a rich experience: “Nothing is lacking, pressing against you, or imminent.” Additionally, a soft aesthetic wraps everything in a warm embrace.

Puzzle game… Unpacking a room. Photo: Witch Beam

For example, in Witch Beam’s puzzle game, players unpack items from boxes and arrange them in a new home. Although there are constraints on placement, unlike traditional puzzle games, there’s no punishment for incorrect placements—no timers or scoring systems to contend with. The colorful pixel art enhances the experience.

Project Horseshoe’s definition aligns with the rise of handheld consoles made for communal play on sofas, particularly around the Nintendo Switch’s 2017 launch, coinciding with substantial genre growth. By 2019, indie designer Matthew Taylor began a Twitter account called Wholesome Games to feature titles reflecting their criteria. Eventually, the wholesome games movement—led by Taylor with partners Jenny Wyndham, James Tillman, and Victoria Tran—developed into a collective that hosts showcases for charming, non-threatening games, later evolving into a publishing company.

The success of wholesome games illustrates the genre’s broader expansion. The inaugural Wholesome Direct aired in 2020, coinciding with a surge in cozy game popularity during the COVID-19 pandemic lockdown, not least due to the massive success of Nintendo’s Animal Crossing: New Horizons, drawing in 25,000 viewers. The latest Wholesome Direct in June achieved an impressive 5 million views.

The solace of sadness… Spiritfarer. Photo: Thunder Lotus Game

This trend is reflected on Steam, where the number of games categorized as “cozy” is on the rise. In 2020, only 15 games were launched with cozy tags on Steam, according to SteamDB. By 2021, this figure doubled to 39 releases, and in 2022, it doubled again to 85. By 2024, a staggering 373 cozy games were released—over one game per day. Each time the genre appears to peak, it continues to soar. Major commercial hits include Animal Crossing, which outperformed any Call of Duty title with nearly 50 million copies sold, while popular farming game Stardew Valley has over 41 million copies sold.

Kelly Baudlow, an associate professor and head of Game Research and Design Programs at Harrisburg University, posits that cozy games signify more than just a genre; they represent “ideological shifts in game design.” This is evident in the diverse experiences cozy games provide. For instance, Unpacking centers on organizing household items, while A Short Hike invites players to explore a mountainous summer getaway. Spiritfarer delivers a management simulation focused on consoling souls and dealing with grief, and Venba weaves an emotional narrative around nostalgia and Tamil cooking.

A darker theme… Strange Horticulture. Photo: Bad Viking

Recently, even darker-themed games have been classified as cozy. Strange Horticulture, for instance, involves players managing a shop selling toxic plants, while Dredge introduces horror elements within a low-stakes fishing and sailing premise. “At their core, these games are fun, hopeful, and nurturing,” remarks Windom, a partner in the wholesome gaming initiative. “We want players to feel warmth and security when engaging with them. However, this definition has likely broadened to encompass games dealing with offensive or uncomfortable topics, all while remaining within a safe environment.”

Rhea Gupte and Prateek Saxena from India-based Imissmyfriend studio didn’t intentionally set out to create a cozy game, yet their debut title, Fishbowl, fits the bill perfectly. The game follows Alo, a 21-year-old woman who relocates to a new city for her video editing job, only to grapple with grief over her grandmother’s passing amidst pandemic lockdowns. Despite the heavy themes, little cozy touches can be found throughout Fishbowl, from its carefully curated color palette to its detailed pixel art and soft audio design.

So many cozy… fish bowls. Photo: Imissmyfriends.studio

“We began with the theme and the narrative we wished to convey,” explains Gupte, who serves as the game’s author and art director. “When contemplating the design and overall mood of the game, it became clear that a cozy atmosphere was necessary. Otherwise, the themes could become overwhelmingly heavy and difficult to navigate. Our goal was to introduce a sense of lightness, despite the more serious subjects involved.”

As the cozy genre continues to evolve, there’s a growing recognition that comfort is subjective. Nonetheless, Baudlow reminds us that not all non-violent games warrant the cozy label. “It’s not appropriate to simply stick that tag on everything,” she emphasizes.

The countryside dream… Stardew Valley. Photo: Concerns

Fishbowl differs from Stardew Valley in its portrayal of farming. Gupte and Saxena highlighted the disparity between how agrarian life is romanticized in games versus the harsh realities many face. “In India, farming embodies significant challenges,” Saxena noted. Games like Palace on the Hill, where the protagonist must cultivate land to settle debts, oppose the cozy narrative. Yet in alternative contexts, farming is often romanticized as a leisurely lifestyle.

TOEM, a meditative photography game developed by Something We Made in 2021, represents another facet of the genre. Although it is unmistakably a cozy game, it deviates from typical visuals by utilizing a monochrome palette. Lucas Gullbo, one of Toem’s developers, explains that while the black and white aesthetic may appear harsh, “the game conveys an emotional resonance that counters the daunting notion of being monochromatic.”

The nostalgia of food… Venba. Photo: Visai Games

Where will the cozy genre go from here? Recently, idle games have emerged as a sub-genre, featuring low-stakes elements like fishing in CornerPond or relaxing with a frog on Idle Island. Games such as Ronderets set in a cozy laundromat also include classic cozy features—farming elements and resource management paired with delightful graphics—but importantly, player effort remains minimal. Players can engage in decorations and small mini-games, but the games can progress without active participation, which contributes to their appeal. Is there an inherent comfort associated with leisurely idleness? This is a question worth exploring as the genre continues to expand.

“In the realm of cozy and wholesome games, and games at large, it’s a particularly nascent medium in the process of unveiling genres and mechanics,” remarks Wyndham. “It’s uncommon to witness something truly groundbreaking. As the wholesome and cozy game movements blossomed, they felt like uncharted territory. Why settle for typical first-person perspectives when you could opt for something more innovative? Change is often slow to emerge.

Source: www.theguardian.com