Month: February 2019

Bent Tree

A snow knee? No, I don’t think so.

When I see a snow knee I know it is the result of massive snows bending a tree over. It is also on a down-hill slope. The tree has been bent by the weight of winter snows in the mountains pushing down, laterally, on its trunk. The tree is generally straight above the knee, as in the Spring it shakes off the snows and grows true. But the knee remains, a tell-tale bend in the tree that shows its survival of passing winters.

This was different. The tree had a bend, but it was lateral to the slope, not down-hill. And here in the rolling hills of Virginia we have not had the amounts of snow generally associated with the snow-kneed trees of the Rocky Mountains of the western United States. Something else had bent this tree.

It was clear what had happened. I could see that the tree had been bent over early in its life. Some other tree or a large limb had fallen and caught the little tree and forced it down to the ground. But the smaller tree’s thin trunk had been flexible, and it did not split. The little tree was pushed done, nearly to the ground, under the weight of it fallen sister.

All signs of the other tree are gone, but the bent tree tells the story of the fall, the crushing blow, and the aftermath.

Sometime in the past, disease or a windstorm caused a tree to fall in these woods. It was likely a large tree, not huge, but about 10 inches in circumference. Or it was a limb that was downed by the same causes. It fell from a tree that may still stands in the forest. When it – tree or branch – fell, it hit the little tree. It bent the smaller tree over and pinned it to the ground. And there they lay. The smaller tree would never be able to right itself due to the weight of the large tree/branch.

But the smaller tree did not give in. Its root structure had not been torn out of the ground and was still intact. The smaller tree was still viable could grow even under the weight of the tree/branch that had crushed it. The top of the smaller tree which lay pressed to the ground died and fell away. Today there is a scar of healed wood that surrounds the rotted spot now so close to the ground. The scar is partially covered by a round, rolled callus of wound-wood. This callus is the tree’s natural response to the injury. The callus seals off the damaged area and protects it from infection.

Today the larger tree/branch is gone. But the smaller tree still lives. It is twisted to be sure, yet even in its captive state, it threw off a new branch that reaches vertically up from its twisted trunk and each year leafs and blossoms with some of the prettiest flowers in the forest. It is a dogwood. Its dense wood helped it survive the blow. Its resilience helped it to live and to grow. And its nature gives flowers and brightness to this patch of the deep woods.

Now it is Winter. In the Spring the tree will again show its toughness and determination, and it will flower.

(*Just_a_Note) – Wallace Broecker

News sources around the world have reported the death of Wallace Broecker. As a climate scientist, he penned an article that was published in the journal Science in 1975. This article was among the early warning calls of the effect of atmospheric carbon dioxide (CO2) to cause a rise in the global mean temperature. Dr. Broecker titled the article “Are we on the brink of a pronounced Global Warming”. Through his article, and many others that followed, the term “global warming” has come into common use and is readily understood by all to imply a continuing rise in the global temperature to the point that it has a detrimental effect on the oceans, wildlife, agriculture, and human society.

As Broecker stated in his 1975 article, “… the exponential rise in atmospheric carbon dioxide content will tend to become a significant factor and by early in the next century [the ‘next century’ started in 2000] will have driven the mean planetary temperature beyond the limits experienced during the last 1000 years.”

Further in the article Broecker predicted, “As the CO2 effect will dominate, the uncertainty … lies mainly in the estimates of future chemical fuel use and the magnitude of the warming per unit of excess atmospheric CO2.” When any of us is outside we can see and often smell the exhaust of the continuing use, and increased use, of fossil (chemical) fuels by the world’s expanding population.

So when in his article Broecker asks, “Are we in for a climate surprise?”, the answer is both yes and no. Yes, it is happening, CO2 continues to clog our atmosphere. But no, in 2019 it is not a surprise.

The 1975 article may be found at – https://blogs.ei.columbia.edu//files/2009/10/broeckerglobalwarming75.pdf

The picture is taken from the 1975 article.

CO2 – the Keeling Curve

Many things lie at the heart of climate change. Fundamental in this is global warming due to the rise in atmospheric carbon dioxide (CO2). The primary source of the CO2 is the consumption of fossil fuels by each and every one of us. We drive our cars, and CO2 is emitted in the exhaust. We turn on lights and use electricity generated from burning coal or gas. These methods of generating electricity result in the emission of CO2. These emissions have a direct effect on wildlife, the oceans, and the weather.

The mention of automobiles might put us in the mind that this problem only started since cars have been around. But it is not just the recent use of fossil fuels, we have been burning coal for a long time. Once emitted by burning of fossil fuels CO2 does not dissipated; it accumulates. Some of the CO2 may be taken up by trees and other plants in their respiration cycle. They take in CO2 and during photosynthesis the CO2 is converted into oxygen (O2). Carbon can be locked up in dead plant material too. When a tree falls in the forest its use is not over. There are kingdoms of plants and animals that will use the dead tree for food and homes in their own lives. As these plants and animals devour the now decomposing tree, they consume the carbon and lock it in their own bodies. But then as they die their carcasses, as small as they are, store some tiny bit of carbon to be released into the atmosphere and earth as the plants and creatures decompose into the earth. Over millions of years the decomposition of ancient organic matter, dead plants and animals, has produced the current fossil fuels that we use.

But how do we know that the level of atmospheric CO2 is increasing? First we can read the levels of atmospheric CO2 in ice cores. These cores are from specialized drills that penetrate deep into glaciers. When the core is drilled and extracted for examination, the levels of CO2 from past centuries can be measured. As the drill goes deeper and deeper into the glaciers the cores show what the atmosphere was like in the times past. The deeper the core is drilled, the further back in time the sample goes. When snow and ice accumulated on the surface of the glacier centuries ago it captured a signature of the gases that made up the atmosphere. From these cores the CO2 from ancient fires, and human use of wood and coal as a fuel, and emissions by ancient volcanoes can be studied. It has been established that accumulation of CO2 in the atmosphere has been going on from preindustrial times, hundreds of years ago. Since the introduction of factories and industry that used fossil fuels to operate and manufacture goods, the CO2 in the atmosphere has increased at a higher rate.

A key tool in understanding the increase of CO2 in the atmosphere has been the work of Charles D. Keeling. In 1956 he began a program to measure atmospheric gases, including CO2, at the Mauna Loa observatory in Hawaii. As these observations are plotted over time, they show an increasing level of CO2 with each passing year. The graph that shows this increase, known as the Keeling Curve, also shows the change of the seasons in the northern hemisphere. The upwards spikes of the saw-tooth curve indicate rising CO2 in the Winter months when the leaves are off the trees and are not converting CO2 into O2. The downward slope of each “tooth” indicates the activity of the trees and other plants in the growing seasons of Spring and Summer as they remove CO2 from the atmosphere and convert it into O2. But with each passing year the curve goes every upward.

From these two studies, we can determine that CO2 continues to increase based primarily on human activity. The rising levels of CO2 in the atmosphere result in a continually rising average global temperature. This is due to the greenhouse effect as the CO2 and other gases trap energy from the sun in the atmosphere. The rising levels of CO2 also result in ocean acidification.

A copy is the Keeling Curve from the Scripps Institute CO2 program is inserted below.

The Scripps Institute CO2 program website may be found at http://scrippsco2.ucsd.edu/

Golden Apples

Planned obsolescence, a one-way trip, will be the demise of the Parker Solar Probe. It will burn up. But that’s ok; it’s all part of the plan. NASA’s probe will collect information on the Sun’s corona. The information to be gathered and beamed back to Earth is important to our understanding of solar processes.

The probe will make 24 orbits of the Sun over seven years. In its final seven orbits the probe will swing out past Venus and then slingshot back in towards the Sun to descend further through the heat of the Sun’s corona on each of its final orbits. Eventually it will pass within 3.8 million miles of the Sun’s surface.

The corona is the upper layer of the Sun’s atmosphere, extending millions of miles beyond the visible surface of the Sun, the photosphere. Photons released by nuclear fusion deep in the interior of the Sun are emitted by the photosphere, giving light. The corona lies millions of miles above this but is curiously hotter than the Sun’s surface. Solar winds generated in the polar and equatorial regions of the Sun lash out from the corona and send massive amounts of electrically charged particles streaming away from the Sun. These winds and other solar activities are the solar weather which reaches across the 93 million miles between the Earth and the Sun and can cause havoc on Earth. The particles of the solar wind travel at speeds over one million miles per hour and can cover the distance between the Sun and the Earth in about ten days. This is much slower than the light from the Sun which can cover that distance in about eight minutes.

The most visible aspect of the solar winds is the generation of aurora, curtains of glowing colors of light, that appear near the Earth’s magnetic poles. In the northern hemisphere, these displays are often called Northern Lights. They shimmer in the Earth’s upper atmosphere when the particles of the solar wind hit the lines of the Earth’s magnetic field. The strongest of these solar winds can also destroy the electronic capability of satellites. The winds can wipe out power grids on the Earth’s surface plunging cities into blackouts which can last for days. When the bursts of energy that generate the solar winds are detected, warnings can be made so that delicate equipment can be turned off or otherwise protected. Life on Earth is protected from the charged particles of the solar wind by the Earth’s own magnetic field. But astronauts above the Earth, or perhaps on a mission to Mars, or living on the moon, are not protected from the massive stream of charged particles.

The Parker Solar Probe is helping us to develop a deeper understanding of the fundamental processes of the Sun. By studying the data received from the probe, we will be able to better forecast solar weather and protect life and property. This knowledge will also provide important information regarding how to protect astronauts when we go out to build colonies off Earth.

Recently the probe reached a milestone on it mission; it began its second orbit of the sun. Important data has already been sent by the probe and received by NASA scientists. On the second orbit, protected by its 4.5 inch carbon-composite solar shield, the probe will pass within 15 million miles of the Sun’s surface. It will go deeper. With each orbit it will transmit more data on the solar wind, and it will continue to find information related to solar eruptions which accelerate particles dangerous speeds, and will plumb the mystery of why the corona is several 100’s of time hotter than the surface of the Sun. The probe will descend deeper and deeper into the heat to discover the depths of the plasma of the Sun’s corona.

These are the golden apples of the Sun, to gain knowledge, to know, to understand.

 

The picture is based on NASA imagery.

Information on the Parker Solar Probe found at https://www.nasa.gov/sites/default/files/atoms/files/parkersolarprobe_presskit_august2018_final.pdf .

 Golden Apples of the Sun based on collection of Ray Bradbury stories of that name and from W.B. Yeats The Song of Wandering Aengus