|
|
Abstract Title:
Late Glacial fire and nitrogen dynamics at lacustrine sites in Alabama and Michigan: evidence of an acid rain event?
is part of the Paper Session:
Paleorecords II. Climate and Environmental History in the Eastern U.S.
scheduled on Tuesday, 4/8/2014 at 10:00 AM.
Click below for author bios:
Author(s):
Joanne P Ballard* – University of Tennessee
Sally P Horn – University of Tennessee
Chad S Lane – Chad Lane, University of North Carolina, Wilmington
Zheng-Hua Li – NASA Marshall Space Flight Center
Steven G Driese – Baylor University
Thomas V Lowell – University of Cincinnati
Abstract:
We analyzed stable nitrogen isotopes, total nitrogen, and macroscopic charcoal in sediments from three lakes in Alabama and Michigan to characterize temporal patterns in nitrogen cycling and explore links between nitrogen, climate, and fire across the late glacial in eastern North America. We used cores from Cahaba Pond, Alabama, recovered by Delcourt et al. (1983, Ecology), and matched our isotope and charcoal analyses to their pollen stratigraphy. Cores from Swift and Slack Lakes in Michigan were obtained in 2008. Thin-section analysis across a 20-cm section from Cahaba Pond that encompasses the Younger Dryas shows a transition from mineral-rich to organic-rich sediments, with loessal silt aggregates. All three lakes recorded roughly coeval nitrogen perturbations at the onset of the Younger Dryas, when a dramatic shift occurred in terrestrial and aquatic vegetation at Cahaba Pond. All three sites also registered fire events across the late glacial. We explore the possibility that observed perturbations to the nitrogen cycle are evidence of nitric acid rain. Such an event could result from nitrate production in the atmosphere due to shock waves from an extraterrestrial event as discussed by Prinn and Fegley (1987, Earth and Planetary Science Letters). If our nitric acid rain idea is correct, it would lend support to the Firestone extraterrestrial impact hypothesis. Concentrations of nitrate and ammonium in ice cores, and sudden eutrophication and shifts from alkaliphilous to acidiphilous diatoms in lake sediments, might also support a nitric acid rain event at the onset of the Younger Dryas.
Keywords:
Younger Dryas, Late Glacial, nitrogen, isotopes, extraterrestrial, acid, rain, Cahaba Pond, climate, paleofire, charcoal, lake sediments, Slack Lake, Swift Lake
Ussello Horizon – not from new paper below
Quartz melt structures in European coversands may support Younger Dryas extraterrestrial impact hypothesis
The Tell Tale Tusk
My dear Kepler, I wish that we might laugh at the remarkable stupidity of the common herd. What do you have to say about the principal philosophers of this academy who are filled with the stubbornness of an asp and do not want to look at either the planets, the moon or the telescope, even though I have freely and deliberately offered them the opportunity a thousand times? Truly, just as the asp stops its ears, so do these philosophers shut their eyes to the light of truth.
Press Release from Liverpool John Moores
I have only scanned this new paper and there is a lot in there. Cheers to readers who help sort through.
We report new stratigraphic, tephrochronology and dating results from the Tocuila Mammoth site in the Basin of Mexico. At the site there is evidence for a thin meteorite airburst layer dated between 10,878 and 10,707 cal BC at the onset of the Younger Dryas (YD) cool period. The Upper Toluca Pumice (UTP) tephra marker, caused by a Plinian eruption of the Nevado de Toluca volcano, dated from 10,666 to 10,612 cal BC,is above that layer. The eruption must have caused widespread environmental disruption in the region with evidence of extensive reworking and channelling by the Lake Texcoco shoreline and contributed to the widespread death and/or extinction of megafaunal populations, as suggested by earlier authors, but the new work reinforces the view that both catastrophic events must have caused large environmental disruption in a short time period of around two hundred years. There is no evidence for megafauna (mammoths, sabre toothed cats, camels, bison, glyptodonts) after the UTP volcanic event and subsequent lahars in the Basin of Mexico. — From abstract
Tocuila Mammoths, Basin of Mexico: Late Pleistocenee Early Holocene stratigraphy and the geological context… by George Howard
I was chilling with the family two weeks ago at Atlantis, Bahamas, when to my surprise an additional mammoth tusk entered my life. I got a hush-hush email and photo from a friend and long-time employee telling me that our contractor’s brand new Volvo excavator was at that moment assisting in the excavation of a large mammoth tusk and skull.
I was aware since 2007 that the stream channels Restoration Systems was restoring on the property (to off-set other development in the watershed) had revealed bones of extinct ice age mammals. A camel tooth and other Camelops parts had been found, and subsequent dirt scratching had revealed Toxodon remains – resulting in Toxodon’s most northerly and only N. American occurrence. Cool!
But at the time funds were apparently not available for further investigation. So outside of asking our operators to keep an eye out, and maintaining a faint interest in perhaps pitchin’ in someday to dig the blue-tarped site myself, (which we had left out of our project easement), the old bones were not my principal interest in the property.
It turns out that researchers had not turned their back on the site. Further excavation was commenced this Spring, apparently led by a private enthusiast who sought the help of our equipment as I lay by the pool. Since we returned I have spoken once to the landowner (RS only owns the mitigation easement) and she is putting me in touch with the researcher.
At this point everything is under wraps, literally and figuratively. The 11-foot long (!) brittle tusk has been plastered as seen in the photo and moved to safe keeping. And the owner and researcher are considering their options while not revealing the location or announcing the discovery at this time.
 I’m back — with at least five blogs loaded in my chamber. It is a terrible thing for a blogger to disappear for longish periods, only to re-appear with several posts in quick succession. But I’m not getting paid for this and (somewhat) erratic blogging is better than no blogging at all. (In my defense as well, pressing news on our subject has been scarce).
First up is a wonderful British Library interview with Tusk-adored Mike Baillie. [Listen here] For those unaware, Dr. Baillie is a special figure to catastrophists. He came to our subject with a combination of unquestioned expertise and a fearless intellectual honesty that in science circles makes hen’s teeth look common. His development of the Irish Oak Long Chronology from long-buried bog trees is a universally regarded “mainstream” [I hate that word] contribution to our understanding of paleo-ecology and, thus?, climate.
But rather than using his data to pimp political messages, he used it to tell us the truth: At least five times in ancient history the world’s trees stopped growing. You read that correctly: Trees stopped growing in unison across great swaths of the planet, perhaps all of the planet, since writing was invented. The most narrow [52:00] rings at far flung locations are simultaneous despite centuries to millennia of intervening time.
Mike struggled to resolve his objective findings with uniformitarian, terrestrial explanations, such as mystery volcanoes, but settled convincingly on cosmic impact as the cause largely because of his secondary and subjective investigation of Irish Myth.
He discovered his home country tales of heroic clashes in the sky were actually looking back him from laboratory wood.
There are still holes and unknowns — but the available data show five distinct periods of profound planetary pain from the sky. From Wiki:
Upon examining the tree-ring record, Baillie noticed indications of severe environmental downturns around 2354 BC, 1628 BC, 1159 BC, 208 BC, and AD 540. The evidence suggests that these environmental downturns were wide-ranging catastrophic events; the AD 540 event in particular is attested in tree-ring chronologies from Siberia through Europe and North and South America. This event coincides with the second largest ammonium signal in the Greenland ice in the last two millennia, the largest being in AD 1014, and both these epochs were accompanied by cometary apparitions. Baillie explains the general absence of mainstream historical references to this event by the fact it was described in terms of biblical metaphors since at that time “Christian beliefs included the dogma that nothing that happens in the heavens could have any conceivable effect on the Earth.”[1]
The story of Mike’s intellectual journey is extraordinary and worth an hour of time if this is your kind of thing (or if you care to maintain civilization). He tells it well and the British Library is thanked for making it available to those who will listen.
Mike Baillie Interview” Comets, Catastrophism and Irish Myth by George Howard
William I. Thomson III is a new friend of the Tusk, and a helpful one at that. With great care and obvious patience Bill has developed a tremendously informative and downright fascinating bibliography of Catastrophism. Anyone interested in reading the variety of publications within, and contributors to, our broad subject will appreciate his hard work. The list is filled with today’s journal articles and working hyperlinks where available.
From Abbott, Baillie and Clube, through Yeomans and Zanner, the list below is to my knowledge the most up-to-date compendium of written work concerning our ancient field. Enjoy.
PS. Bill and I are working on a YDB debate-only bib which I hope to post soon.
Celestial Catastrophism Bibliography & Handbook from William I. Thompson III by George Howard
The excavation at Bull Creek, Oklahoma, shows the paleosol — ancient buried soil; the dark black layer in the side of the cliff — that formed during the Younger Dryas. – UCSB
More recently, another group of earth scientists, including UCSB’s Alexander Simms and alumna Hanna Alexander, re-examined the distribution of nanodiamonds in Bull Creek’s sedimentological record to see if they could reproduce the original study’s evidence supporting the YDB hypothesis. Their findings appear in the Proceedings of the National Academy of Science.
“We were able to replicate some of their results and we did find nanodiamonds right at the Younger Dryas Boundary,” said Simms, an associate professor in UCSB’s Department of Earth Science.
The paper
Arkansas
UCSB Press Release
University of Oklahoma Press Release
Editor: Jay Melosh
What Killed the Woolly Mammoth? UCSB Professor Finds Evidence to Support Comet Collision
Alexander R. Simms
Could a comet have been responsible for the extinction of North America’s megafauna — woolly mammoths, giant ground sloths and saber-tooth tigers? UC Santa Barbara’s James Kennett, professor emeritus in the Department of Earth Science, posited that such an extraterrestrial event occurred 12,900 years ago.
Originally published in 2007, Kennett’s controversial Younger Dryas Boundary (YDB) hypothesis suggests that a comet collision precipitated the Younger Dryas period of global cooling, which, in turn, contributed to the extinction of many animals and altered human adaptations. The nanodiamond is one type of material that could result from an extraterrestrial collision, and the presence of nanodiamonds along Bull Creek in the Oklahoma Panhandle lends credence to the YDB hypothesis.
More recently, another group of earth scientists, including UCSB’s Alexander Simms and alumna Hanna Alexander, re-examined the distribution of nanodiamonds in Bull Creek’s sedimentological record to see if they could reproduce the original study’s evidence supporting the YDB hypothesis. Their findings appear in the Proceedings of the National Academy of Science.
“We were able to replicate some of their results and we did find nanodiamonds right at the Younger Dryas Boundary,” said Simms, an associate professor in UCSB’s Department of Earth Science. “However, we also found a second spike of nanodiamonds more recently in the sedimentary record, sometime within the past 3,000 years.”
The researchers analyzed 49 sediment samples representing different time periods and environmental and climactic settings, and identified high levels of nanodiamonds immediately below and just above YDB deposits and in late-Holocene near-surface deposits.
The late Holocene began at the end of the Pleistocene 11,700 years ago and continues to the present. The researchers found that the presence of nanodiamonds is not caused by environmental setting, soil formation, cultural activities, other climate changes or the amount of time in which the landscape is stable.
The discovery of high concentrations of nanodiamonds from two distinct time periods suggests that whatever process produced the elevated concentrations of nanodiamonds at the onset of the Younger Dryas sediments may have also been active in recent millennia in Bull Creek.
“Nanodiamonds are found in high abundances at the YDB, giving some support to that theory,” Simms said. “However, we did find it at one other site, which may or may not be caused by a smaller but similar event nearby.”
A “recent” meteorite impact did occur near Bull Creek but scientists don’t know exactly when. The fact that the study’s second nanodiamond spike occurred sometime during the past 3,000 years suggests that the distribution of nanodiamonds is not unique to the Younger Dryas.
Table 1.
Bement video
Earlier GSA abstract
Co-author spotlight: Andrew S. Madden
Carter, Simms, Benamara….
PNAS Lexus lane? 46,000 hits!
Significance
In 2007, scientists proposed that the start of the Younger Dryas (YD) chronozone (10,900 radiocarbon years ago) and late Pleistocene extinctions resulted from the explosion of a comet in the earths atmosphere. The ET event, as it is known, is purportedly marked by high levels of various materials, including nano-diamonds. Nanodiamonds had previously been reported from the Bull Creek, Oklahoma, area. We investigate this claim here by quantifying the distribution of nanodiamonds in sediments of different periods within the Bull Creek valley. We found high levels of nanodiamonds in YD boundary deposits, supporting the previous claim. A second spike in nanodiamonds during the late Holocene suggests that the distribution of nanodiamonds is not unique to the YD
Quantifying the distribution of nanodiamonds in
pre-Younger Dryas to recent age deposits along Bull Creek, Oklahoma Panhandle, USA by George Howard
A comet collided with the Earth’s atmosphere from the Constellation of Orion on 17 Jan AD 773 with coma stretched across the whole sky and disappeared within one day with ‘dust rain’ in the daytime.
– Old Tang Dynasty Book
Mellot in Nature 2012
Eichler 2013
Miyake and Tree Rings
BBC 2012
Mysterious Abrupt Carbon-14 Increase in Coral Contributed by a Comet in 773 Ad by George Howard
|
|
Loading...
Recent Comments