Saturday, August 31, 2019

Pageant of Evolution (3), Earth's Evolution in 24 hours (#a)

Here’s my third Pageant of Evolution, Four Corners Free Press column, again I couldn’t avoid starting back at the beginning, but this time it feels like I’ve gotten the solid footing that was evading me previously.  I admit I don’t feel particularly pleased with the first and second, but I do like this third essay and look forward to seeing how well I manage to finish the story of our Earth’s Pageant of Evolution.
My next column will continue into the Metazoic and Cenozoic when Life started utilizing all the resources and potential that Earth had spent all those billions of years processing and developing.  The period that highlights how much environment and climate dictates how Life evolves and who thrives or dies.



In last month’s celebration of Earth’s Pageant of Evolution I touched on the interplay of tectonics, geochemistry and archaic life. The intimate love-making of Earth's geology and biology - to put it poetically rather than scientifically. 

Getting back to the science, scientists have learned about the why and how of various ocean bottom structures that provide the catalyst between geochemistry and biochemistry, by helping bind basic molecules into complex organic building blocks of life.

This month to convey the immensity of Deep Time I’m scaling down Earth’s 4.6 billion years to 24 hours. A billion years take 5 hours plus change, 3.2 million years tick by every minute. Our human story fits into Earth’s past 4-5 seconds. Imagine that. 

Friday, August 30, 2019

Diary 8/30/2019 - Life happens.

Life is what happens while you’re busy making plans.  This summer my blogging effort wound up being focused on trying to convey the pageant of Earth’s Evolution and offering a glimpse into the folds within folds of accumulating harmonic complexity flowing down the stream of time that is the evolutionary process.

July 1990

Personally it’s also been a summer of five solo road trips down to Phoenix via a route I hadn’t been on since the ‘80s.  Driving out of Cortez, Colorado on Hwy 160 past the Four Corners Monument, then south on Hwy 191 along the western edge of the Defiance Uplift, including visits to Canyon DeChelly, then on to I-40 and scooting over to Hwy 87, which rises into the wonderfully surprising Coconino National Forest and then down the ancient Mogollon Rim.

The Mogollon Rim is the edge of the Colorado Plateau and its a two thousand foot drop into what’s called the “Transition Zone” with it’s jumble of one time islands caught between the ultimate rock and a hard place.  Then out into the “Valley of the Sun” and the “Basin and Range” geologic province.  Geologically it’s a fascinating drive and going solo allowed me a slower pace than our usual rush to reach our destination.

Though the drive south tended to be a bit more rushed than the drive home.  You see, I had dates to keep with my infant grandson.  Unlike with my first two grandkids who’s stay at home mother also had plenty of extended family around, this little guy’s parents have full-time professional careers.  Being an old hand with babies I was drawn into helping out with the child care.

Then when it was discovered how well the little guy and I get along, I kept getting invited back when the unexpected forced mom, then dad, to take a couple trips and my no longer carpentering left me available.

If you know how much Life and Earth’s story fascinate me, you can imagine what interacting with and watching an infant evolving impacts my thoughts.  Meaning my mind has become increasingly distracted and cluttered from the blogging task at hand.  

August 2019

Saturday, August 24, 2019

Jeff Gee, Joanna Haigh - Earth's Magnetic Force Field - What a scientist sounds like


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This posting is dedicated to conveying a fact based appreciation for our planet’s protective magnetic “force field” with lectures from: 
Geoscientist Jeff Gee - Exploring Extremes of Earth's Magnetic Field
Professor Joanna Haigh - The Sun and Climate

… along with some awesome data driven visualizations, narrative is a bit on the melodramatic side, but hey, that's what folks want:
Earth's Magnetism in HD - Discovery Channel
Magnetism - Defending Our Planet, Defining The Cosmos - NASA Multimedia Science
Origins of the Earth’s magnetic field - CEOAS - Oregon State

Magnetism - Defending Our Planet, Defining The Cosmos
NASA Multimedia ScienceApril 3, 2017

Friday, August 23, 2019

David Bercovici - Origin of Plate Tectonics - What a scientist sounds like.

One aspect of this blog is all about my own journey of discovery through knowledge acquired from the global community of scientists over the course of generations.  
I do have strong opinions that are based on how I've processed the information I've accumulated so far.  Within that frame of reference, it always seemed self-evidence that our moon's close proximity to Earth during the first billion years had to have a hand in starting plate tectonics on this planet.  
I could not understand why geoscientists never discussed that aspect when writing about origins of plate tectonics.  It simply didn't make sense to me.
But, recently listening to scientists such as David Bercovici, I've come to appreciate many aspects of that situation I had no clue of.  Not that I've had any particular insights, but I have gained a world of appreciation for why the moon's tidal influence on the start of plate tectonic isn’t near as obvious as I was imagining.
It seems to me a great example of allowing facts to dictate my opinion.  I appreciate I possess a fraction of the knowledge someone like Bercovici has accumulated - thus if his words reveal flaws in my own thinking - it's my duty to understand him, not simply to dismiss him.  
As opposed to the agenda driven character, who is so self-certain that he allows his under-educated mind to conjure (and then believe) all sorts of fantastical under-informed rationalizations in order to dismiss the expert's knowledge.  
See, truth doesn't matter to the self-certain - pushing agenda over substance is their priority.
Whereas in serious science honestly acquiring evidence that helps us gain better understanding IS the goal - while ultimate certainty is unattainable.

Be forewarned the following is a talk given to his peers, so it's a peek into how scientists speak with each other, rather than the crisp public talks I usually like sharing.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Professor David Bercovici Ph.D.
On the Origin of Plate Tectonics

Thursday, August 22, 2019

Caroline Beghein - Tectonics to Deep Earth Dynamics - What a scientist sounds like

Here Caroline Beghein Ph.D. gives a very nice general introduction to plate tectonics.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



From Plate Tectonics to Deep Earth Dynamics
Published on Sep 2, 2016

A Seismological Journey Inside the Earth.
2016 IRIS/SSA Distinguished Lecturer 
Caroline Beghein Ph.D., U.C. Los Angeles

Tuesday, August 20, 2019

Jason Morgan - history of plate tectonics - What a scientist sounds like

The Changing Landscape of Plate Tectonics
Geophysicist W. Jason Morgan
    
This talk gives a historical account of the developing science of plate tectonics, given by Geophysicist William Jason Morgan.
Although I'll admit I chose to include it as much for the introduction as for the interesting talk that follows.  You see, while most introductions have me pushing fast-forward, once in a while I’m stopped by something that resonates and I’ll pay attention.  The introduction to this video is an example.  Professor Jerry Mitrovica* delivers an enjoyable listen, while beautifully illustrating what a serious scientist is all about.
* Incidentally, he gives a great lecture in his own right: 
   
Jerry Mitrovica exemplifies the ‘scientific way’ - the passionate curiosity driven need to learn about our planet, based on honestly assessing all evidence and facts at hand, while striving to attain better information for yet more accurate understanding, always moving forward.
When listening to Mitrovica please notice his willingness to search out and examine the shortcomings and mistakes in his own, thinking, work and conclusions.  His respect for colleagues, even his “competitors” along with a respect for their substantive work - It’s because honestly learning about our planet as accurately as possible is the cornerstone to their work and careers.  (Why isn’t that aspect being loudly enunciated by writers?)

Monday, August 19, 2019

Plate Tectonics and Life - What Scientists Sound Like


Although I can't find quite the right video for this section, I do have a couple of excellent presentations by scientists to their colleagues.  It's more nitty-gritty than I usual share over here, but it is on the topic - along with being more wonderful examples of What Serious Scientists Sound Like.

I've also included three articles touching:
video - Origins: Earth’s Journey Toward Life - Carnegie Science
Plate tectonics may have driven the evolution of life on Earth
   Ross Large, John Long, July 15, 2015
Linking the rise of atmospheric oxygen to growth in the continental phosphorus inventory  -  Cox et al.  2018
Did Plate Tectonics Set the Stage for Life on Earth?
   Lisa Kaspin-Powell - Jun 7, 2018
video - Life with and Life without Plate Tectonics, AGU 2014

Recall geophysicist William Jason Morgan words:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Origins: Earth’s Journey Toward Life
    
Carnegie SciencePublished on Jan 7, 2019

Saturday, August 17, 2019

Paul Hoffman - Snowball Earth explained - What a scientist sounds like.


The second and third paragraphs in my second Pageant of Evolution column seem too discombobulated in hindsight.  It’s a great example of writing before having one's proverbial ducks in a row.  But hey, I was distracted and rushed and we learn from our mistakes.

In any event, that’s why I chose Paul F. Hoffman to feature in this “What a scientist sounds like” - Tectonic and Sedimentary Field Geologist in the Department of Earth and Planetary Sciences at Harvard University, currently he is their Sturgis Hooper Professor Emeritus

His honors go back to 1977 and his published work on Snowball Earth goes back to 1998.  He is considered a foremost expert in Snowball Earth research and he gave a wonderful series of lectures for Earth Dynamics Research Group at Curtin University of Technology in 2016.  

Unless you’re a serious student or scientist much of this will be over your head, however much won’t be!  The outlines are easy to follow, and the complexities are fascinating to hear about, even if the nuances are beyond our comprehension.  At least one becomes aware of unimagined complexities, along with unimagined levels of scientific understanding.

I’m starting by embedding a shorter simpler overview that he gave at Mount Royal University, as the 2018 keynote speaker for the Faculty of Science and Technology Research Days.  Then I share links and poster highlights of his more extensive Earth Dynamics Research Group lectures, enjoy.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Also, check out this treasure trove:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(click on image for clearer view)

Paul Hoffman
Curtin University of Technology