#heat island effect

[the-colors-of-tokyo]

Memories of Autumn:

My favorite persimmon tree.

Memories necessary to escape the artificially intensified heat of summer, a result of living in a manmade island of concrete and asphalt and to ave something to look forward too.

One could say that autumn in Tokyo begins in November when leaves start changing colors. This may seem a month or two late, but one has to remember that Tokyo is southern area at about the same latitude as Winston-Salem, North Carolina or Athens, Greece. And, believe it or not, Las Vegas. (Tokyo is between 35-36 latitude north. Tokyo is not a city, it is a prefecture.)

Small Town Tokyo: Himonya

[zamikazi]

Heat Island.

[sustecsol]

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[reasonsforhope]

"With “green corridors” that mimic the natural forest, the Colombian city is driving down temperatures — and could become five degrees cooler over the next few decades.

In the face of a rapidly heating planet, the City of Eternal Spring — nicknamed so thanks to its year-round temperate climate — has found a way to keep its cool.

Previously, Medellín had undergone years of rapid urban expansion, which led to a severe urban heat island effect — raising temperatures in the city to significantly higher than in the surrounding suburban and rural areas. Roads and other concrete infrastructure absorb and maintain the sun’s heat for much longer than green infrastructure.

“Medellín grew at the expense of green spaces and vegetation,” says Pilar Vargas, a forest engineer working for City Hall. “We built and built and built. There wasn’t a lot of thought about the impact on the climate. It became obvious that had to change.”

Efforts began in 2016 under Medellín’s then mayor, Federico Gutiérrez (who, after completing one term in 2019, was re-elected at the end of 2023). The city launched a new approach to its urban development — one that focused on people and plants.

The $16.3 million initiative led to the creation of 30 Green Corridors along the city’s roads and waterways, improving or producing more than 70 hectares of green space, which includes 20 kilometers of shaded routes with cycle lanes and pedestrian paths.

These plant and tree-filled spaces — which connect all sorts of green areas such as the curb strips, squares, parks, vertical gardens, sidewalks, and even some of the seven hills that surround the city — produce fresh, cooling air in the face of urban heat. The corridors are also designed to mimic a natural forest with levels of low, medium and high plants, including native and tropical plants, bamboo grasses and palm trees.

Heat-trapping infrastructure like metro stations and bridges has also been greened as part of the project and government buildings have been adorned with green roofs and vertical gardens to beat the heat. The first of those was installed at Medellín’s City Hall, where nearly 100,000 plants and 12 species span the 1,810 square meter surface.

“It’s like urban acupuncture,” says Paula Zapata, advisor for Medellín at C40 Cities, a global network of about 100 of the world’s leading mayors. “The city is making these small interventions that together act to make a big impact.”

At the launch of the project, 120,000 individual plants and 12,500 trees were added to roads and parks across the city. By 2021, the figure had reached 2.5 million plants and 880,000 trees. Each has been carefully chosen to maximize their impact.

“The technical team thought a lot about the species used. They selected endemic ones that have a functional use,” explains Zapata.

The 72 species of plants and trees selected provide food for wildlife, help biodiversity to spread and fight air pollution. A study, for example, identified Mangifera indica as the best among six plant species found in Medellín at absorbing PM2.5 pollution — particulate matter that can cause asthma, bronchitis and heart disease — and surviving in polluted areas due to its “biochemical and biological mechanisms.”

And the urban planting continues to this day.

The groundwork is carried out by 150 citizen-gardeners like Pineda, who come from disadvantaged and minority backgrounds, with the support of 15 specialized forest engineers. Pineda is now the leader of a team of seven other gardeners who attend to corridors all across the city, shifting depending on the current priorities...

“I’m completely in favor of the corridors,” says [Victoria Perez, another citizen-gardener], who grew up in a poor suburb in the city of 2.5 million people. “It really improves the quality of life here.”

Wilmar Jesus, a 48-year-old Afro-Colombian farmer on his first day of the job, is pleased about the project’s possibilities for his own future. “I want to learn more and become better,” he says. “This gives me the opportunity to advance myself.”

The project’s wider impacts are like a breath of fresh air. Medellín’s temperatures fell by 2°C in the first three years of the program, and officials expect a further decrease of 4 to 5C over the next few decades, even taking into account climate change. In turn, City Hall says this will minimize the need for energy-intensive air conditioning...

In addition, the project has had a significant impact on air pollution. Between 2016 and 2019, the level of PM2.5 fell significantly, and in turn the city’s morbidity rate from acute respiratory infections decreased from 159.8 to 95.3 per 1,000 people [Note: That means the city's rate of people getting sick with lung/throat/respiratory infections.]

There’s also been a 34.6 percent rise in cycling in the city, likely due to the new bike paths built for the project, and biodiversity studies show that wildlife is coming back — one sample of five Green Corridors identified 30 different species of butterfly.

Other cities are already taking note. Bogotá and Barranquilla have adopted similar plans, among other Colombian cities, and last year São Paulo, Brazil, the largest city in South America, began expanding its corridors after launching them in 2022.

“For sure, Green Corridors could work in many other places,” says Zapata."

-via Reasons to Be Cheerful, March 4, 2024

[crzygthumbs]

Please Don't Rock Your Yard!

While we were in Colorado there was a trend to rip out anything that was growing and replace it with a gravel landscape. Every time I saw someone ripping out their grass to do this: I wanted to throttle them. Here is why: rock is not low maintenance. I understand those who don’t garden are looking for a low maintenance option for their yard. Please. I beg you. Do not put gravel across your…

[fthrdvs]

Please Don't Rock Your Yard!

While we were in Colorado there was a trend to rip out anything that was growing and replace it with a gravel landscape. Every time I saw someone ripping out their grass to do this: I wanted to throttle them. Here is why: rock is not low maintenance. I understand those who don’t garden are looking for a low maintenance option for their yard. Please. I beg you. Do not put gravel across your…

[rodspurethoughts]

Eight midwestern cities included in new heat island analysis

A new analysis of urban heat islands highlights 8 midwestern cities where more than 10 million people experience temperatures elevated at least 8 degrees Fahrenheit. The Midwest Climate Collaborative shared this response: “Climate Central’s analysis of urban heat islands highlights eight of our Midwestern cities, where over ten million people experience temperatures elevated by at least eight…

[justinspoliticalcorner]

Umair Irfan at Vox:

It’s gearing up to be another scorching year.

Countries like Brazil, Thailand, Japan, Kenya, Nigeria, Australia, and Spain already experienced record warm temperatures this year, and in the past few days, heat has killed dozens in India and Mexico. Now states like California, Nevada, Arizona, and Texas are getting ready to roast as a massive heat wave settles in. It’s likely to push temperatures well into triple digits. And summer hasn't even officially started yet. It’s an alarming echo of 2023, which was the hottest year on record, but this year could be hotter still. Though the Pacific Ocean is shifting into its La Niña phase, which typically brings cooler global weather, the extraordinary warmth over the past year is still baked in. Scientists say these record highs align with their expectations for climate change, and warn that more scorchers are coming. There’s more to heat waves like this than high temperatures, though. The forces behind them are complex and changing. They’re a public health threat that can exacerbate inequality, cause infrastructure to collapse, and amplify other problems stemming from warming. But with global average temperatures continuing to rise, more records will fall.

Heat waves, explained

Extreme heat might not seem as dramatic as hurricanes or floods, but the National Weather Service has deemed it the deadliest weather phenomenon in the US over the past 30 years, on average. What counts as a heat wave is typically defined relative to local weather conditions, with sustained temperatures in the 90th to 95th percentile of the average in a given area. So the threshold for a heat wave in Tucson is higher than the threshold in Seattle. During the summer in the Northern Hemisphere, the northern half of the planet is tilted toward the sun, which increases daylight hours and warms the hemisphere. The impact of this additional exposure to solar radiation is cumulative, which is why temperatures generally peak weeks after the longest day of the year. Amid the increase in temperatures in the summer, meteorology can push those numbers to extremes.

Heat waves typically begin with a high-pressure system (also known as an anticyclone), where atmospheric pressure above an area builds up. That creates a sinking column of air that compresses, heats up, and oftentimes dries out. The sinking air can act as a cap or heat dome, trapping the latent heat already absorbed by the landscape. The high-pressure system also pushes out cooler, fast-moving air currents and squeezes clouds away, which gives the sun an unobstructed line of sight to the ground. The ground — soil, sand, concrete, and asphalt — then bakes in the sunlight, and in the long days and short nights of summer, heat energy quickly accumulates and temperatures rise. Heat waves are especially common in areas that are already arid, like the desert Southwest, and at high altitudes where high-pressure systems readily form. Moisture in the ground can blunt the effects of heat, the way evaporating sweat can cool the body. But when there’s little water in the ground, in waterways, and in vegetation, there isn’t as much to soak up the heat besides the air itself.

[...] But extreme heat can also build up in places that have a lot of moisture. In fact, for every degree Celsius the air warms (1.8 degrees Fahrenheit), it can absorb about 7 percent more water, which can create a dangerous combination of heat and humidity (more on that below).

Urban areas further exacerbate this warming. As roads, parking lots, and buildings cover natural landscapes, cities like Los Angeles and Dallas end up absorbing more heat than their surroundings and can become as much as 20°F warmer. This is a phenomenon known as the urban heat island effect. Heat waves typically last around five days but can linger longer if the high-pressure system is locked in place. “In some cases, you actually can get these kinds of patterns getting stuck, and that can lead to heat waves lasting much longer,” said Karen McKinnon, an assistant professor of environment and sustainability at the University of California Los Angeles. Eventually, the high-pressure system will start to weaken, allowing in cooler air and precipitation that can bring the heat wave to an end. However, as the warm season continues, more high-pressure systems can settle in and restart the heating process.

[...] Climate change caused by greenhouse gases from burning fossil fuels is poised to make heat waves longer, more intense, and more frequent. It takes time for the dust to settle on the heat waves of a given moment, to allow scientists to evaluate just how much humans have contributed to the problem.

[...] That heat isn’t distributed evenly, however. Nighttime temperatures are rising faster than daytime temperatures. “In general, since records began in 1895, summer overnight low temperatures are warming at a rate nearly twice as fast as afternoon high temperatures for the U.S. and the 10 warmest summer minimum temperatures have all occurred since 2002,” according to the National Oceanic and Atmospheric Administration. This can seriously impair how people cope with high heat. The effects of warming can vary by latitude, too. Polar regions are warming up to three times as fast as the planetary average, fueling heat waves in the Arctic. In fact, cooler parts of the planet are heating up faster than places closer to the equator, so people living in temperate climates may experience some of the biggest increases in extreme heat events. Already hot parts of the world also get hotter, pushing them beyond the realm of habitability at certain times of the year. And as human-generated greenhouse gas emissions continue to flood the atmosphere — atmospheric carbon dioxide concentrations recently peaked at 420 parts per million — heat waves are projected to become more frequent and more extreme.

[...]

The timing of heat waves is changing: Periods of extreme heat that occur early in the season tend to have greater public health impacts. That’s because people are less acclimated to heat in the spring and early summer. Cooling infrastructure may not be in place, and people may not be taking heat precautions like staying hydrated and avoiding the sun. That’s why early-season heat waves in the US, as we have seen across the country this year, are so troubling. As climate change makes heat waves more common, it also increases the frequency of early- and late-season extreme temperatures, lengthening the hot season. The worst effects of heat aren’t always in the hottest places: While absolute temperatures may rise higher in already warm areas like the southwestern US, heat waves can have their deadliest impacts in cooler regions, where high temperatures are less common. Warmer areas often already have air conditioning in homes and offices, while regions that usually don’t get as warm have less cooling infrastructure and fewer places to find relief. The people in these regions are also less acclimated to high temperatures and may not recognize warning signs of heat-induced health problems.

Some people are far more vulnerable to extreme heat: Elderly people and very young children face some of the highest risks from extreme heat. People with certain health conditions, like high blood pressure and breathing difficulties, also face greater harm. But even otherwise healthy people can suffer from heat waves if they are exposed for long durations, such as those working outdoors in agriculture and construction. Heat waves exacerbate structural inequalities: While cities can warm up faster than their surroundings, poorer neighborhoods — which are disproportionately home to people of color — tend to get hotter. These neighborhoods often have less tree cover and green spaces, and more paved surfaces that soak up heat. At the same time, lower-income residents may have a harder time affording crucial cooling. The pattern of heat inequality plays out on an international scale, too, with lower-income countries already facing higher health and economic costs from heat waves.

The tools used to cope with heat are also stressed by it: Power plants, which provide electricity for everything from fridges to air conditioners, themselves need to be cooled, and they become less efficient as the weather warms. Power lines have lower capacities under extreme heat, and hardware like transformers experience more failures. If enough stress builds up, the power grid can collapse just when people need cooling the most. Power disruptions then ripple through other infrastructure, like water sanitation, fuel pumps, and public transit. We’re running out of time to act: All this means that heat waves are going to become an increasingly impactful and costly fact of life across the world — from the direct impacts on health to stresses on infrastructure. But since humans share a significant portion of the blame for extreme heat waves, there are also actions people can take to mitigate them. Increasing energy efficiency can relieve stress on the power grid, and adding power sources that don’t require active cooling like wind and solar can boost capacity without adding greenhouse gas emissions.

Vox has a good article on why we are seeing longer and more severe heat waves around the world: climate change effects are part of the reason for the increased duration and severity of heat waves globally.

[botaniqueer]

Time for the moment of truth as to whether Passiflora adulterina is hardy in zone 8b! 🤞

[kinsey3furry300]

Dear America,

If you could not give us all anxiety every two years, that would be really swell. Yours, The rest of the world.

[crzygthumbs]

Please Don't Rock Your Yard!

While we were in Colorado there was a trend to rip out anything that was growing and replace it with a gravel landscape. Every time I saw someone ripping out their grass to do this: I wanted to throttle them. Here is why: rock is not low maintenance. I understand those who don’t garden are looking for a low maintenance option for their yard. Please. I beg you. Do not put gravel across your…

[fthrdvs]

Please Don't Rock Your Yard!

While we were in Colorado there was a trend to rip out anything that was growing and replace it with a gravel landscape. Every time I saw someone ripping out their grass to do this: I wanted to throttle them. Here is why: rock is not low maintenance. I understand those who don’t garden are looking for a low maintenance option for their yard. Please. I beg you. Do not put gravel across your…

[shameemhaider]

समस्या से समाधान तक- एक पड़ताल

[smithstructure]

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