Category: Climate Change

Earth's Emergency Heat Valve: The Hurricane

6/2/2022

Vicki Cobb
The Master Chef of Kids' Hands-on Science

Earth has a problem. The sun creates hot spots over land, in the air and in the water. That’s why there are winds, weather, and currents in the ocean as Earth tries to even out the heat, moving warmer masses of air and water to cooler areas.

During hurricane season ( from June 1-November 30), only 10 or 11 of the 80 tropical disturbances off the west coast of Africa (where most of our hurricanes originate) become large enough storms to be given a name. Only two or three of them hit the United States. They are not frequent but they are massive wind storms that can destroy life and property.

Do they do anything good at all? As far as the Earth is concerned, these largest of all storms are a safety valve to rapidly move heat that has been accumulating in the oceans up to the stratosphere (from 7 to 31 miles above the Earth’s surface). From there it will be transported through the air to over the North Pole. It’s the way Earth stops a fever.

Once a hurricane forms, it must have an ocean surface that is at least 80°F to keep moving and to grow. Under the storm, huge amounts of warm water become water vapor. Warm moist air rapidly rises through the spinning winds of the hurricane, up to the stratosphere. When moist air reaches the frigid (-70°F) stratosphere the water vapor quickly condenses to liquid water (rain) releasing its heat. This heat makes surrounding air molecules move faster forming winds.

How do hurricanes cool off the oceans? How do they move the heat? Here’s a clue: Wet your finger and wave it in the air. How does it feel? Pretty cool, I bet! That’s because the heat from your finger changes liquid water into water vapor (a gas) as your finger dries. Water vapor molecules store this extra heat. They rise because they are lighter than other air molecules.

So, a hurricane is a heat engine that moves water vapor from the ocean’s surface high enough to condense back into liquid water and release heat safely to the stratosphere forming rivers of wind that move it to the poles.

Scientists predict that global warming will increase the number and the power of the hurricanes as the ocean surfaces become increasingly warmer during our summers.

This diagram of the anatomy of a hurricane shows the direction of the winds. The blue represents cold air descending while the pink shows warm moist air rising. The outflow surface clouds form as water condenses into a "table-top" cloud, releasing heat that becomes wind. Kelvinsong via Wikimedia

Hurricane Isabel (2003) as seen from orbit during Expedition 7 of the International Space Station. The eye, eyewall, and surrounding rainbands, all characteristics of hurricanes, are clearly visible in this view from space. Image courtesy of Mike Trenchard, Earth Sciences & Image Analysis Laboratory, NASA Johnson Space Center

Vicki Cobb's How Could We Harness a Hurricane? offers questions and provides new points of view that may just change peoples' thinking by showing young readers the work scientists and engineers are doing to avoid future disasters. The book includes hands-on experiments that make science fun, be it at home or in the classroom. Here's a link to the book' s Trailer.

How Could We Harness a Hurricane was named a 2018 Best STEM Book K-12 by the National Science Teachers Association and the Children's Book Council.

Vicki is a member of iNK's Authors on Call so you can invite her to your classroom via iNK's videoconferening Zoom Room. Click here to find out more:

MLA 8 Citation
Cobb, Vicki. "Earth's Emergency Heat Valve: The Hurricane." Nonfiction Minute,
iNK Think Tank, 24 Apr. 2018, www.nonfictionminute.org/
the-nonfiction-minute/Earths-Emergency-Heat-Valve-The-Hurricane.

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Climate Change: The Facts and the Consequences

4/28/2022

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Dorothy Hinshaw Patent
Nature’s Animal Ambassador

The polar jet stream can travel at speeds greater than 100 miles per hour (160 km/h). Here, the fastest winds are colored red; slower winds are blue. NASA/Goddard Space Flight Center

No one can honestly deny that our climate has been changing in recent years. Before the winter of 2018-2019, California had only a year’s water supply stored in its reservoirs. Wildfires have become an annual threat throughout much of the west, while the Midwest and East Coast have experienced record-setting winters. These problems are due to complex interactions among temperature, winds, and water currents.

A major change is the warming of the atmosphere. The earth’s atmosphere has been getting warmer since the late 1800s, when factories started spewing out carbon dioxide. Because natural variations also affect the temperature, a graph showing the temperature over time is a jagged line. But the trend is consistently upward and follows the graph of increasing carbon dioxide in the atmosphere due to human activities. That’s strong enough evidence that we are at least a large part of the problem, and the vast majority of climate scientists are urging countries of the world to reduce their carbon dioxide emissions.

A major player in the world’s weather is the jet stream, which helps circulate the atmosphere around the world about every two weeks. This flow of fast-moving air speeds across North America from west to east, separating cold arctic air from warmer, more southerly air. The jet stream used to run in a fairly direct arc across the northern United States. But in recent years it has become less stable, dipping southward in the eastern U.S. to bring frigid winters to the Northeast while arching northward in the West, carrying warm, dry air there. Scientists believe that the rapid melting of the Arctic ice brought about by global warming is part of the cause for the jet stream’s instability.  However, climate trends are controlled more by the oceans. Scientists estimate 95% of the heat from global warming is being stored in the oceans, increasing water temperatures even into the depths.

As global warming continues, so will climate change. The melting of sea ice and glaciers is already raising the sea level. While scientists don’t blame climate change for devastating Hurricane Sandy, Sandy’s extreme coastal flooding was made worse by the increase in sea level that’s already occurred. As time goes on, coastal cities around the world will be at increasing risk for more severe storm damage.

Because warm air holds more moisture than cold air, storms are becoming more severe, increasing blizzards and flooding storms. Some agricultural regions that depend on reliable rainfall may soon be unable to grow crops, disrupting the food supply.

Climate change is complicated, but because it affects us all, we need to learn about it.  The Environment Protection Agency has questions and answers about climate change.

Oceans cover 71% of the Earth’s surface and contain 97% of the water on our planet. This chart shows how this water has absorbed the vast majority of the increased atmospheric heat due to global warming.

This chart shows how carbon dioxide in the atmosphere has increased since 1960. The measurements are made near the top of Mauna Loa on the island of Hawaii, thousands of miles away from any land-based major pollution.

Calculations of global warming prepared in or before 2001 from a range of climate models. The projections assume no action is taken to reduce emissions.

Yellowstone National Park’s majestic geologic wonders and remarkable wildlife draw millions of visitors each year. But there was a time when these natural treasures were in great danger, all because after years of unrestricted hunting, one key piece of the puzzle had been eliminated—the wolf.

Now, more than a decade after scientists realized the wolves’ essential role and returned them to Yellowstone, the park’s natural balance is gradually being restored. Dorothy Hinshaw Patent's text supplemented by spectacular full-color photographs show the wolves in the natural habitat that was almost lost without them. Click here to find out more.

Dorothy Hinshaw Patent is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.

MLA 8 Citation
Patent, Dorothy Hinshaw. "Climate Change: The Facts and the Consequences."
     Nonfiction Minute, iNK Think Tank, 17 Apr. 2018,
     www.nonfictionminute.org/the-nonfiction-minute/
     Climate-Change-The-Facts-and-the-Consequences.

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Defining Weather, Global Warming, and Climate Change

4/27/2022

2 Comments

Dorothy Hinshaw Patent
Nature’s Animal Ambassador

People are confused. They hear the terms “global warming” and “climate change” tossed about without much explanation. We all talk about the weather, but what does that word actually mean, and how does it relate to these other terms?

NASA defines global warming: “Global warming is the increase in Earth’s average surface temperature due to rising levels of greenhouse gases.” So global warming is a measurable statistic. Record the temperature at many sites on Earth for a given year, add them up, and divide to get an average. Rising levels of greenhouse gases are also well measured. The famous “Keeling curve” of atmospheric CO2 begun in Hawaii in 1957 is the best example.

Climate change is more complicated. Climate change is a long-term change in the Earth’s climate and includes measures of the atmosphere, oceans, land, cryosphere (snow and ice), wind, precipitation, deforestation, wildfire, and more, as well as temperature. So, climate change is a more inclusive measure of many factors changing the Earth system, which is very different from a single statistic like the rise in temperature from global warming.

Then there’s the weather. What, exactly is the weather? That term refers to what’s going on in the atmosphere at a particular time and place. It includes the air temperature, wind speed, humidity, and precipitation. Weather happens day to day, while global warming is shown by recording day-to-day temperatures over a long period of time. Climate change is a long-term process that can result in drastic changes in conditions on our planet.

To sum up: Weather refers to what’s happening in the atmosphere at a given time and place over the course of days to months.

Global warming refers to an upward trend in the average temperature over a period of years to decades.

Climate change is a long-term process that can be influenced by changes in the average temperature but includes many other factors.

To watch a brief but amazing video of the affect of global warming and climate change over the next 20 years, click here.

Dorothy's recent book The Call of the Osprey, has been chosen as a Best Science Trade Book for Students by the National Science Teachers Association. It covers research being done in Western Montana by scientists at the University of Montana. Starting in the late 1800's, Butte, MT, at the headwaters of the Clark Fork River, was the largest copper mine in the U.S. The major result of the mining was two-fold—the electrification of America and the largest Superfund cleanup site in the U.S. Call of the Osprey deals not only with current research but also with the history of Butte and the lives of the scientists involved in the research. Click here to find out more.

Dorothy Hinshaw Patent is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.

MLA 8 Citation
Patent, Dorothy Hinshaw. "Defining Weather, Global Warming, and Climate Change."
     Nonfiction Minute, iNK Think Tank, 16 Apr. 2018,
     www.nonfictionminute.org/the-nonfiction-minute/
     Defining-Weather-Global-Warming-and-Climate-Change.

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Sun Attack! 1852 When Earth Needed Some SPF8000 Sunscreen

1/26/2022

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Jan Adkins
The Explainer General

September 1, 1852, British astronomer Richard Carrington was sketching the pattern of sunspots being projected from his telescope onto a white panel. Suddenly, a rare white-light solar flare outshone the rest of the image. Trouble was on its way!

The revolving molten core of our Earth generates a magnetic field – the magnetosphere – that not only orients our compasses but protects us from the sun’s lethal radiation. Intense charged particles from the sun are magnetically bent around the earth. Some follow magnetic lines into the poles and light up the arctic and antarctic skies as aurorae. Periodically, during times of intense surface disturbance, giant flares of energy can burst out of the sun: CMEs, coronal mass ejections. They’re directional and they seldom hit earth. When they do, the most powerful can punch through our magnetosphere.

On September 2, 1852, Carrington’s flare energy reached the earth and danced along the copper wires of our (then) new telegraph system. Hundreds of miles of wire burst into flames. Telegraph offices burned down, operators at their keys were knocked back by severe shocks, instruments and switches melted. For two days the telegraph system that wasn’t destroyed sent nonsense. Then spectacular aurorae that lit up the skies, they, finally, proved that the sun’s energy was the aurora’s source. Aurorae were seen all over the world, even near the equator. After two days the effects ceased.

Could it happen again? It has. In 1882, a flare melted telegraph equipment in Chicago. In 1902, solar energy disrupted the Atlantic telegraph cable and shut down Swiss electric trollies. In 1940, hundreds of miles of American telegraph and telephone lines were destroyed. A solar flare in 1989 almost forced the Space Shuttle Discovery to return to earth early and knocked out Quebec’s electricity; only quick action in New Jersey, where a major transformer melted, saved the United States’ east coast from a long blackout. In 2003, a powerful flare destroyed or disabled many satellites, damaged instruments on our Mars orbiter, and sent the crew of the International Space Station into its flare-shielded module. In 2005, our GPS navigation satellite constellation was knocked out for 10 minutes.

All the life and energy we have comes from the sun. But that energy, itself, is dangerous. We’re partially protected by our magnetosphere. Hope for the best and reach for the sunscreen.

A solar flare erupted on the right side of the sun on Oct. 2, 2014, while a cloud of solar material just below was flung out into space. Image Credit: NASA/SDO/ Wiessinger

Adkins new book is about the first drive in an automobile. The wife of the inventor took her kids to see their grandparents.

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1800 and Froze-to-Death

11/16/2021

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Jan Adkins
The Explainer General

The biggest bang in two thousand years was heard as far as sixteen hundred miles away. It happened in April of 1815, on the island of Sumbawa in the southwest Pacific Ocean, now part of Indonesia. Mount Tambora erupted in an immense volcanic explosion. Seventy-one thousand islanders were killed almost immediately. The big bang began a global cataclysm that sowed the broadest crop of human misery any single earthly event has yielded.

Tambora’s eruption hurled millions of tons of ash and sulfur high into the circulating jet-stream, cooling temperatures around the world. It delayed the monsoon rains that were supposed to sustain crops around the Indian Ocean. Floods followed drought along with a deadly surge in the water-borne disease, cholera: tens of millions died of it all along the Ocean’s shores and as far north as Moscow. As the shroud of ash spread north, China’s rice crop failed in cold weather: more millions died.

The volcano’s effects reached the higher latitudes of Europe in 1816. Crops were killed by hard frosts in spring and summer. The price of oats and wheat tripled, quadrupled. “Bread Riots” swept through the streets of British and European cities as starving farm families crowded the cities, looking for any kind of work.

In North America, hard frosts were recorded in every month of 1816. Late-sown seedling plants were killed as far south as Virginia, where retired President Thomas Jefferson’s crops were destroyed, plunging him into lifelong debt. Snow fell across New England on July 6, 1816, a foot deep in Quebec City, Canada. Steam railroad lines weren’t laid, yet, so grain couldn’t be brought from warmer southern fields. An exodus of failed northern farmers left family homes to populate those milder Midwest prairies. They called this year of famine and disappointment, “Eighteen Hundred and Froze-To-Death.”

While millions of the poor starved, wealthy classes of Europe were merely inconvenienced by Tambora’s weather. A privileged group joined the poets Percy Shelley and Lord Byron to “summer” in Switzerland. Storms and cold drove them indoors where they competed to write the best “ghost story.” Percy’s wife Mary Shelley won with Frankenstein. Byron’s personal doctor, John Polidori, also wrote a humdinger: The Vampyre, which was adapted by Bram Stoker decades later as Dracula.
Tambora’s chilling effects lasted only three years. Our own challenge of global warming is building more slowly but could be even more troublesome. Tambora’s big bang taught us that we all share cataclysms and weather, even a world away.

The 1815 Tambora volcano produced an estimated thirty six cubic miles of exploded rock and ash which showered down in varying depths over land as far away as eight hundred miles to the northwest. But it was the debris that the jet stream carried over Asia, Europe and North America that earned 1816 the title "year without a summer." NASA

This photograph depicts the summit caldera of the Mount Tambora volcano more than a hundred years after its massive explosion. A collapse was triggered by the emptying of the magma chamber beneath the volcano as the result of the 1815 eruption. The volcano removed the mountain's estimated thirteen thousand-foot high peak leaving a hollow area 3.7 miles in diameter and thirty-six hundred feet deep. By Tisquesusa via Wikimedia Commons

Adkins' latest book is about the first drive in an automobile. The wife of the inventor took her kids to see their grandparents. Learn more about it here.

The author/illustrator is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.

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Earth's Emergency Heat Valve: The Hurricane

Climate Change: The Facts and the Consequences

Defining Weather, Global Warming, and Climate Change

Sun Attack! 1852 When Earth Needed Some SPF8000 Sunscreen

1800 and Froze-to-Death

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