The Eastward Wobble, The Dance of the Earth


In April of this year NASA released findings related to the Earth’s melting ice sheets. Often when the gringa things about climate change, warming temperatures and melting ice sheets, the only thing I consider is how sea levels will rise. It never occurred to me that ice sheet disintegration may result in a more wobbly world.

Think about the traditional children’s toy, the spinning top. It’s a bit like our world. As it slows its spin it begins to wobble. As ice sheets melt and the balance of Earth begins to shift, we will, indeed, experience a global wobble. Scientists officially define this as a “periodic wobble and drift of the poles”. All the gringa wants to know is, “What exactly does this mean for me? Am I going to fall on my patootie trying to walk to my car?”

NASA asserts that over the past sixteen years Antarctica and Greenland, combined, have averaged about 400 billion tons of ice loss annually. Before the year 2000, as Earth spun on its axis it had a gentle drift toward Canada (westward). Because of ice loss, now the drift is about 75 degrees in the opposite direction, eastward. This happens because as ice converts to water and moves elsewhere, the distribution of Earth’s mass changes. What this means exactly is that the location of the North and South poles will change. In other words, Earth’s axis is relocating.

Now, the traditional location of Earth’s North Pole may have to be renamed to the Northeastern Pole. Earth’s axis is like an invisible pin stuck through the Earth from North to South. The Earth spins on the tip of the pin, rotating with a slight wobble that is normal. However, if the geographic location of the Poles change, complete topographical and satellite telemetry systems have to be adjusted to accommodate this change. For the average person, this means that your GPS is going to deliver you to the wrong place!

Scientists have long known that the Poles shift by a few centimeters from time to time as a part of Earth’s natural climate adjustment cycles. But what we are dealing with now is much more dramatic. Experts estimate that the shift is averaging about ten centimeters Eastward annually. Our great-great-grandchildren may have to adjust Christmas stories to have Santa Claus living in Russia or Norway.

Although scientists understand that as ice continues to melt the Earth will adjust by shifting its axis to the place where it has lost mass, even their best predictions are really just a guess. This is an extremely complex problem. It’s not just melting ice sheets that affect the process but also loss of groundwater in above ground reservoirs and underground aquifers (which underground aquifers cannot be accurately measured) as well as glacier melt and glacier movement. Many glaciers float about the ocean as they please.

The Earth’s ice and water storage formula affects polar drift. Yet many of the variables in the formula cannot be measured or can change their individual affect. So, scientists are left scratching their heads, doing the best with what they’ve got, and hazarding their best guess on what humanity can expect.

Ice melt is not the only thing that can bump the North Pole to a different location. Enormous earthquakes and devastating tsunamis can do the job as well. Indonesia’s great earthquake moved the North Pole eastward by about 2.5 centimeters and also lengthened Earth’s day cycle by 2.68 microseconds. No wonder I’ve been so tired lately! The gringa is filled with wonder at how humans remain at the mercy of nature despite all of our technological advances.

Sources: www.nasa.gov

news.nationalgeographic.com

Image Credit:  www.worldatlas.com

 

 

Amazing Grace and the Conveyor Belt


Is there a way to stem the tide of sea level rise due to climate change? I mean, if we can’t build a seawall around the coast of every continent and island, what other option is there other than an eventual mass human migration inland? Well, NASA thinks there very well may be a solution.

The Earth may be saving herself. Climate change researchers have been collecting data from NASA satellites to determine where all this extra liquid water from melted ice sheets and glaciers is ending up. It seems the Earth has absorbed over three trillion tons of water (that’s about the equivalent of what’s in Lake Huron) that are replenishing depleted lakes and underground aquifers. Now, this is great news but not a permanent fix. Researchers estimate this temporary band-aid will slow sea level rise by about twenty percent. Earth is buying us Earthlings some more time to get our you-know-what together and fix this mess we have created.

So, how does this “band-aid” work? The Earth’s regular water budget is provided by annual amounts of water evaporated from the oceans. This becomes precipitation that returns to the Earth through rainfall or snow. It then recycles back into the oceans as runoff or through rivers. As mankind’s use of groundwater has dramatically increased, the Earth has become quite thirsty as reservoirs are depleted. It has become a sponge, compensating for this unprecedented loss by absorbing what is melting from ice sheets and glaciers. This has served to curb rising sea levels despite the fact that glaciers and ice sheets continue to melt.

Now scientists are scrambling to recalculate future models and adjust previous projections of sea level rise as a result of the Earth’s warming oceans. So, although sea levels are still expected to rise, Earthlings have a little bit more time to solve the problems that will cause. But, once the Earth has slated her thirst, all that meltwater will then become a problem.

NASA is using a twin satellite system, GRACE (Gravity Recovery and Climate Experiment), to measure how much water is being stored within the Earth. Since scuba divers can’t delve into these underground reservoirs, just what kind of digital dipstick is being used? The satellites use gravity to measure liquid. The gringa scratches her head and says, “Um, what? A gravity yardstick? How does that work?”

As the twin satellites orbit the Earth, they measure the distance between themselves. Their measurements are so accurate and precise, they can get as close as a strand of human hair. Amazing! But, I digress. GRACE then transmits the data to Earthling researchers who use the information to measure any gravitational change in the Earth that is the result of any change Earth’s water distribution.

By using this method, scientists have measured how much water has been stored within Earth’s continents as a result of ice sheet and glacier melt. This is the first study of its kind. And, according to NASA’s mission to use technology to safeguard the future of Earth and the lives of Earthlings, the agency has shared this knowledge with other scientific communities around the world.

And GRACE is proving her mettle in other areas of climate change data as well. The satellites are tracking circulation and current patterns within the Atlantic Ocean. The typical current pattern of the Gulf Stream carries warm, tropical water northward to Greenland. By the time it arrives at its northern destination, the water has cooled significantly. Colder water is denser so the water that originated from the tropics, and was riding at the surface. has sunk as deep as two miles within the ocean by the time it gets to Greenland. The colder, heavier, bottom water is then dragged back South.

In this way the waters of the Atlantic Ocean are consistently agitated, cooled, oxygenated and nutritionally refreshed. Oceanographers call this pattern the Atlantic Meridional Overturning Circulation (AMOC). However, the gringa prefers the common name, the “Conveyor Belt” of the Atlantic.

The Atlantic’s “Conveyor Belt” effect is like an air conditioner for the world’s oceans. It is critical to modulating the temperature of the Earth. Data collected from GRACE has revealed that the “Conveyor Belt” is slowing down. Researchers are uncertain if this is directly caused by climate change or if other factors are at play.

GRACE is going to help answer these questions. One way is by measuring gravity data from the bottom of the Atlantic Ocean. Changes in the ocean’s currents will result in pressure changes that GRACE can detect with gravitational measurements.

And GRACE is also contributing to the development of practical solutions that can be implemented right now, helping the people of Brazil. 2015 was the worst year in over three decades for drought in Brazil.

Hydrologists were able to use data collected from GRACE to calculate that in a three year period Brazil lost about fifteen trillion gallons of water each year. Water levels of aquifers and rivers were also analyzed.

Brazil is heavily dependent on the country’s rivers to provide water for their people, electricity production and for critical agriculture. The data provided by GRACE enables the Brazilian government to create models that will simulate future expected droughts. This makes it possible for the nation to plan effectively, monitor their water resources responsibly and continue to provide for the water needs of over 200 million Brazilians.

And those are just some of the facts about “Amazing GRACE”.

 

Source:  www.nasa.gov

Image Source:  www.nasa.gov

 

 

 

 

 

 

Warming Lakes & Rivers = Trouble


It’s pretty easy to find climate change articles discussing the changes that are taking place in the world’s oceans. But, the gringa asks, what about the lakes and rivers of the Earth?

I grew up on a river. I love rivers. I love canoeing and floating down rivers on tubes and camping out alongside the banks of a river. What’s happening with these rivers I love? And what about lakes? Every summer we take a traditional three day weekend family trip to one of the most beautiful lakes in Texas. What’s happening to this fabulous lake? Unfortunately, the research shows that these are all changing as well.

NASA’s response to this change is to create a “global water cycle budget”. It covers a ten year period of the Earth’s freshwater concerns. This will be the baseline by which future “global water cycle budget’s” will be compared.

The water cycle involves the entire environmental process of how water moves, in all forms, around this big, blue planet. As depicted in the image posted it is easy to trace how water evaporates from the surface of the Earth. As it rises into the atmosphere it cools, condenses into clouds, then returns to the Earth as precipitation (rain, snow, hail,  or sleet). This is the kind of science the gringa learned in elementary school but it is, perhaps, the most critical environmental cycle for the continuation of life on Earth.

From the year 2000 until 2010 NASA collected satellite data  to estimate how much energy from the sun was required to move water. Hotter days means more evaporation of water within the soil. More evaporation means more moisture in the winds that transport this moisture throughout the world. Because the Earth is a closed system, any water that evaporates from its surface can be accounted for in the water vapor that eventually accumulates in the atmosphere. It’s kind of like taking a jar of pennies to the bank and getting dollars in return. It’s an even exchange of the same thing, money, but it exists in two different forms, pennies or bills. Water on Earth is the same. It’s either here on Earth as water or in the atmosphere as a form of precipitation.

However, the water model is a bit more complicated. Consider that each penny represents a different data set concerning where the water is specifically located, formed, or used. Such as: ocean, lake, evaporation from soil and plants, streams, rivers, human consumption. To help scientists manage all of this data they divide the Earth into seven land masses (Eurasia, South America, North America, Africa, Antarctica, Mainland Australia, Oceania/New Zealand/Tasmania) and nine ocean basins (North Pacific, South Pacific, Indian, North Atlantic, South Atlantic, Caribbean, Mediterranean, Arctic, Black Sea).

Over two dozen satellites provide scientists with data concerning precipitation and evaporation over the land masses and oceans. Researchers can track the movement of atmospheric water vapor, river runoff, groundwater reservoirs, soil moisture and snowpacks.

These important studies have already determined that lakes around the world are warming. This warming trend is affecting the ecosystems they are a part of as well as threatening the security of adequate freshwater supplies.

To come to the conclusion that lakes are warming, NASA used a twenty-five year compilation of data of ground measurements of over 200 lakes on six separate continents. On average, the lakes are warming about half a degree Fahrenheit every decade. Some lakes, the ones at higher latitudes, are warming even faster, one whole degree Fahrenheit per decade. That means that freshwater lakes are warming faster than the oceans.

As lakes warm, algal blooms increase. These rob the oxygen in the water from the fish. NASA’s models predict a twenty percent increase in these toxic algal blooms over the next century. Not only will this result in a chain reaction within the ecosystem wiping out the fish, as well as the wildlife and fauna that depend on those fish, but the blooms will also increase greenhouse gas emissions. Algal blooms are expected to produce methane emissions that will increase four percent over the next decade unless we Earthlings come up with a solution.

Solving the lake warming problem is a very important component of solving the climate change problem because methane emissions are 25 times more powerful than carbon emissions. A massive worldwide increase of algal blooms in freshwater lakes is a disaster we cannot allow to happen.

If the world’s lakes become a casualty of climate change, it won’t just be an environmental disaster, it will be a humanitarian disaster. These are important sources for drinking water, crop irrigation, and the production of food fish that are an important protein source for vulnerable populations around the world. Some researchers are already detecting evidence that productivity in warming lakes is already declining.

Out of the 37 largest aquifers on Earth, 21 are already past the sustainability tipping point and are being depleted. Another 13 are classified as “significantly distressed”. Eight are classified as “overstressed”. “Distressed” and “overstressed” means that these water sources have no natural replenishment to offset consumption. Five more were classified as “extremely stressed”, being depleted but with some replenishment occurring.

These were the conclusions of NASA’s study of ten years of data from the GRACE satellites. The GRACE satellites measure how Earth’s gravity is affected by existing masses of water. What NASA reports is alarming and difficult for the gringa to swallow, even with a glassful of water. That means that almost one third of our world’s groundwater is rapidly disappearing. And what’s even scarier is there is no reliable data that can predict just exactly when these wells will run dry. Yet, we continue to consume rather than conserve.

One of these overstressed reservoirs is the Arabian Aquifer System. It sustains over 60 million people. If we think there’s trouble in the Middle East right now over regional power struggles and the global fight to dominate the oilfields for profit, what the heck can we expect to see when these people have nothing left to drink? What kind of mass exodus will occur when that happens? This is a problem that must be solved. When climate change deniers scoff at the idea that climate change is the single most issue that threatens the national security of all peoples, they have no idea what they are talking about.

If Americans thought the California and Texas droughts were painful, consider what could occur in India and Pakistan, home to the second-most overstressed aquifer, the Indus Basin. Then there’s the third most overstressed water source, the Murzuk-Djado basin in north Africa. These regions are home to almost two billion people! Think about the Syrian refugee crisis. We ain’t seen nothin’ yet.

While working toward a solution, scientists cannot agree on any projected timeline of “time to depletion”. And when the gringa says they cannot agree, I’m talking about discrepancies of warnings of ten years to twenty-one THOUSAND years! However, one thing that these scientists DO agree on is that in a water-scarce society that is water dependent, this kind of ignorance is intolerable. Well, the gringa is glad to hear that.

Because groundwater reservoirs are so deep beneath the surface of the Earth, the only method to accurately measure just how much is down there is to drill, baby, drill. It’s gonna cost a lot of money, but the experts say it has to be done. NASA is committed to using its technology, personnel and data to help secure mankind’s future and improve lives around the world. By sharing knowledge freely with scientists around the world, the agency hopes to increase understanding that will lead to solutions.

The gringa waits to hear NASA’s announcement of a challenge like “Dig A Hole, Save The Planet”. The gringa has every confidence that NASA will continue to lead the charge to save us Earthlings from ourselves and the messes we continue to make. These challenges are simply a way for us to redeem ourselves after making such awful messes.

Source & Photo Credit: www.nasa.gov

 

A Bit Of Sun & Hope For Humanity


Coming up in December is the one year anniversary of the test flight of the Orion spacecraft that launched from Kennedy Space Center December 5, 2014. The test flight was unmanned. Because of its success, the next time Orion punches through the Earth’s atmosphere, it will deliver astronauts to an asteroid in our Moon’s orbit to rehearse their Red Planet mission. That is the ultimate goal, after all, to have a full astronaut crew heading out to deep space with a final destination of Mars.

The amazing new technologies that will send astronauts farther than they have ever gone before is thanks, in part, to the students of science, technology, engineering and mathematics (STEM). NASA and Lockheed Martin offered students the opportunity to collaborate in this daring mission with a program called “Exploration Design Challenge”. What problem were these students asked to solve? The students were challenged to solve the most dangerous issue that faces humans in space – exposure to radiation. The gringa is very proud to say that these students rose to the challenge and their very own radiation experiment was on board for Orion’s test flight. If there was ever a reason for parents to encourage their children in STEM curriculum, parents, the time is NOW!

The emerging generation of scientists will inherit a planet that is rapidly changing. NASA needs this young talent more than ever. Researchers will manage the data collected from satellites and airborne missions. Engineers will keep these missions alive with their technological expertise. These are the critical thinkers the world needs to face the future challenges of rising sea levels and extreme weather events due to climate change. The next generation of astronaut explorers will be the ones to aid our planet in finding freshwater resources out in the cosmos to help replenish are own that are rapidly becoming depleted.

In 2014 NASA studies were published and revealed a rapidly melting western sheet of ice in Antarctica. This appears to be irreversible. Later in the same year, NASA, along with researchers at the University of California, Irvine, concluded that the potential threat of groundwater loss to America’s stable water supply may have previously been underestimated and things were worse than scientists thought. In August of 2014, NASA published research based on the discovery of a large amount of a compound creating ozone depletion. This was an unexpected surprise considering that for decades such a compound has been banned worldwide. Our world is in trouble and our best resource to solve these problems is in the minds of our youth.

The gringa is getting depressed with all this bad news so, let’s get back to the good news! The Orion! I simply must know all I can about this spaceship because the gringa is putting in that ship all her hopes that it is going to be the mother ship of a future fleet of ships that’s going to save humanity’s bacon.

The purpose of the test flight was to see if Orion was up to the task of the most dangerous parts of the mission. Those would be lift-off, entry, separations, the jettison of the Launch Abort System, descent and splashdown. However, most important of all was to test the heat shield that needed to be strong enough to protect astronauts, as well as all the technology on board, from 4,000 degree Fahrenheit temperatures and the related radiation. Is the dear reader dying to know Orion’s report card? The gringa is!

At 7:05am at Cape Canaveral Air Force Station in Florida, Orion was prepped to lift off with the help of a United Launch Alliance Delta IV Heavy rocket. Three RS-68 engines created almost two million pounds of thrust which then pushed a 1.63 million pound spacecraft into orbit. After about four minutes the side boosters disengaged and fell away to Earth. The center booster remained with Orion for another ninety seconds. When its fuel was spent, it disengaged and also fell back to Earth. The next thing to release its hold on Orion was the structural supports and the Launch Abort System. Orion was headed out of Earth’s atmosphere.

Seventeen minutes and thirty-nine seconds after lift-off, Orion began its orbit. Two hours into its flight, Orion traveled through the Van Allen radiation belts which are 3,609 miles away. Data recorders provided critical calculations on the doses of radiation within the cabin. This determined if the craft was of sound design and safe to man with a human crew. Three hours and twenty-three minutes into its flight, Orion headed for Earth’s atmosphere where the heat shield withstood the brutal re-entry friction.

What is re-entry like? Orion hit Earth’s atmosphere at a speed of 20,000 mph. The gringa can only say, “Incredible!” The spacecraft gets so amazingly hot at that speed, it is eventually enveloped in plasma. Plasma is considered the fourth state of matter after solids, liquids and gases. When plasma is created on Orion upon re-entry, what happens is that the heat and friction become so energized that electrons break free from their nucleus and travel along with them. That’s what the Sun does all the time. It’s just a big, ol’ ball of plasma. Orion creates a little bit of Sun on re-entry. The gringa’s mind is filled with the Beatles refrain, “Here comes the sun, little darlin’. Here comes the sun. And I say it’s alright.” After all, ultimately that IS the plan, RIGHT? Orion is going to help launch the scientific efforts that hopefully will make everything wrong with the environment alright? Or, at least give humanity some viable options and hope?

After picking up Orion as it bobbed amongst the waves of the Pacific of the coast of Baja, California, NASA used the data to make improvements for the upcoming manned mission. Astronauts will continue their own preparations for a mission that is sure to make history in so many ways. If everyone at NASA is excited about the future, then they truly believe in the mission. The gringa will take her cue from them and toss out the doom and gloom and grab hold of hope and positivity. I will hold fast to an exciting future that most certainly is full of change, but change is not necessarily always a bad thing.