New BYU study documents extreme 16-year drought in Utah BYU Geography Professor Matt Bekker uses dendrochronology (dendro=tree, chronology=time) to reveal extreme weather patterns in the Western U.S. By taking core samples from trees and measuring tree rings, the BYU research team can correlate patterns in tree rings to weather cycles. The process allows researchers to extend the known climatic history of a region hundreds of years beyond the written history. Such information can be used by water managers to prepare for possible drought cycles in the future. Data collected in Utah revealed an extreme period of drought that spanned 16 years; the event, which occurred in the year 1703, was previously unknown to climatologists. See more at: http://news.byu.edu/archive14-apr-dendrochronology.aspx Video produced by BYU News Producer Julie Walker Photography Brian Wilcox Editor Michael Gordon NEWS RELEASE FROM MAY 1, 2014: TREE RINGS REVEAL NIGHTMARE DROUGHTS IN THE WEST If you think the 1930s drought that caused The Dust Bowl was rough, new research looking at tree rings in the Rocky Mountains has news for you: Things can get much worse in the West. In fact the worst drought of this century barely makes the top 10 of a study that extended Utah's climate record back to the year 1429. With sandpaper and microscopes, Brigham Young University professor Matthew Bekker analyzed rings from drought-sensitive tree species. He found several types of scenarios that could make life uncomfortable in what is now the nation's third-fastest-growing state: - Long droughts: The year 1703 kicked off 16 years in a row with below average stream flow. - Intense droughts: The Weber River flowed at just 13 percent of normal in 1580 and dropped below 20 percent in three other periods. - Consecutive worst-case scenarios: The most severe drought in the record began in 1492, and four of the five worst droughts all happened during Christopher Columbus' lifetime. "We're conservatively estimating the severity of these droughts that hit before the modern record, and we still see some that are kind of scary if they were to happen again," said Bekker, a geography professor at BYU. "We would really have to change the way we do things here." Modern climate and stream flow records only go back about 100 years in this part of the country, so scientists like Bekker turn to Mother Nature's own record-keeping to see the bigger picture. For this study, the BYU geographer took sample cores from Douglas fir and pinyon pine trees. The thickness of annual growth rings for these species is especially sensitive to water supply. Using samples from both living and dead trees in the Weber River basin, the researchers built a tree-ring chronology that extends back 585 years into Utah's natural history. Modern stream flow measurements helped them calibrate the correlation between ring thickness and drought severity. As Bekker and his co-authors report in the Journal of the American Water Resources Association, the west's climate usually fluctuates far more than it did in the 1900s. The five previous centuries each saw more years of extremely dry and extremely wet climate conditions. "We're trying to work with water managers to show the different flavors of droughts this region has had," said Bekker. "These are scenarios you need to build into your models to know how to plan for the future." Bekker collaborated with researchers from the U.S. Forest Service, Columbia University and Utah State University. The team is currently working on a climate reconstruction based on tree rings that date back more than 1,000 years. Read more here: http://news.byu.edu/archive14-apr-dendrochronology.aspx
Views: 67896 Brigham Young University
Tree Ring Dating (Dendrochronology) Debunked by Lord Christopher Monckton. Dendrochronology or tree-ring dating, is the scientific method of dating based on the analysis of patterns of tree rings, also known as growth rings. Dendrochronology can date the time at which tree rings were formed, in many types of wood, to the exact calendar year. This has three main areas of application: paleoecology, where it is used to determine certain aspects of past ecologies (most prominently climate); archaeology and the history of art and architecture, where it is used to date old panel paintings on wood, buildings, etc.; and radiocarbon dating, where it is used to calibrate radiocarbon ages. In some areas of the world, it is possible to date wood back a few thousand years, or even many thousands. As of 1995, the maximum reported fully anchored chronologies is ~11,000 years before the present.
Views: 2317 Reality Uncensored
Have you heard that tree ring dating disproves the Bible? Let's take a closer look at Eric Hovind's Creation Today taking a closer look at that claim! Dendrochronology indeed disproves a world-wide flood. Does Tree Ring Dating Disprove The Bible? https://www.youtube.com/watch?v=hB0slz49GCk How Creationism Taught Me Real Science 65 Dating Assumptions https://www.youtube.com/watch?v=9Ze1jO4jYE4 How Dendrochronology Disproves Noah's Flood https://www.youtube.com/watch?v=_KEfj3LLNSY Follow me at http://www.patreon.com/paulogia http://www.twitter.com/paulogia0 http://www.facebook.com/paulogia0
Views: 19702 Paulogia
In the next instalment of the Archaeology 101 set of videos, I get to show you my wood!! Yep, we're talking about tree ring dating, Dendrochronology. This archaeological dating technique sounds a bit old fashioned, but it's very accurate and we can get very complete sets of data in certain regions. This is round four of the dating series, so enjoy! Learn more! Visit my website for a detailed write-up and extra resources! https://www.digitwithraven.com/single-post/dendrochronology Follow me on all the things!! Instagram: https://www.instagram.com/digitwithra... Twitter: https://twitter.com/digitwithraven Facebook: https://www.facebook.com/digitwithraven/ Music: Carefree by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1400037 Artist: http://incompetech.com/
Views: 808 Dig It With Raven
Subscribe Now: http://www.youtube.com/subscription_center?add_user=ehowgarden Watch More: http://www.youtube.com/ehowgarden Reading tree growth rings allows you to estimate just how long that tree has been alive. Read tree growth rings with help from a professional with the Davey Tree Expert Company in this free video clip. Expert: RJ Laverne Contact: www.davey.com/ Bio: Davey expert and urban forester, RJ Laverne, knows that trees matter. Filmmaker: Pasquale Iacovone Series Description: Choosing the right type of tree and caring for it properly is a great way to create what is known as an impact statement in and around your yard. Get tips on trimming various types of trees with help from a professional with the Davey Tree Expert Company in this free video series.
Views: 31273 ehowgarden
This week we're speaking with Cameron McQuaig and Lawrence Onisto to show you how laser technology can significantly improve on traditional methods of Tree-Ring Dating, or Dendrochronology. We use our SP2000 large format laser cutter as well as our Speedy 360 laser engraving machine to engrave the wood samples from trees from across Canada and across centuries! Laser engraving can significantly reduce time spent on traditional methods of tree-ring dating which involves tedious sanding and then burning to product a carbon print. Cameron also creates artistic prints by copying the carbon from the burnt tree rings onto a canvas creating amazing works of art! To contact Cameron or Lawrence, please visit their Facebook page: https://www.facebook.com/LawrenceandCameron ------------------------------------------------------------------------------------------ To get a quote on our laser engraving and cutting machines, please contact us below: Phone: 1 (888) 998 2217 Email: [email protected] Follow us on social media: Facebook: https://goo.gl/UfHnEa Twitter: https://goo.gl/GEgTwQ Instagram: https://goo.gl/gJN5b4 LinkedIn: https://goo.gl/oBL6V4 Trotec Canada locations: Vancouver | 20381 62 Ave #705, Langley, BC V3A 5E6 Calgary | 820 28 St NE #2, Calgary, AB T2A 6K1 Toronto | 1705 Argentia Rd #9, Mississauga, ON L5N 3A9 Montreal | 8096 Trans Canada Route, Saint-Laurent, QC H4S 1M5
Views: 1781 Trotec Canada
Trees are among the oldest living things on the planet. Some say longer than biblical Creation would allow. Dendrochronology is the science dealing with the study of the rings of trees in determining the dates and chronological order of past events. Learn why it is a help rather than a hindrance to the biblical chronology. Related Articles: Tree ring dating (dendrochronology) (http://creation.com/tree-ring-dating-dendrochronology) Evidence for multiple ring growth per year in Bristlecone Pines (http://creation.com/evidence-for-multiple-ring-growth-per-year-in-bristlecone-pines) Patriarchs of the forest (http://creation.com/patriarchs-of-the-forest) Swedish trees older than the universe? (http://creation.com/swedish-trees-older-than-the-universe) Related Products: Tree Rings, Dating and Changing Climates - A forest scientist looks at the secrets of the past (DVD) (http://creation.com/s/30-9-575) The Creation Answers Book (http://creation.com/s/10-2-505) Creation magazine (free sample copy) (http://creation.com/free-mag)
Views: 3682 CMIcreationstation
Robert Howard of Nottingham University's Dendrochronolgy lab revisited Codnor Castle farm on January 9th to take further core samples for tree-ring dating. This video shows a telescoped version of the process, which involves using a series of ever-longer specialised drill bits, gradually extending the sample until a complete core is taken.
Views: 296 Codnor Castle
Qiang Li (associate professor, IEECAS) shows the technique in Qinling Mountain on International Trainging Program of Climate and Environment Change on "Belt and Road", (2018/05/17)
Views: 56 Rajesh Sigdel
In late summer 2013, Beverly from Tree Ring Productions visited Susan Butler and shot a few minutes of footage about her successful Kickstarter campaign and the future of the Locastore. This is a Tree Ring Carbon Date - fun, easy, and fruitful.
Views: 54 Tree Ring Productions
Relative and Absolute Dating Dr. Michael Wilson, Geology Department, Douglas College "Relative dating would be the placement of something in a sequence. So if we establish a sequence for an area we simply need to know what came first, then what came next, etc. For example, in a sequence of stratified deposits, laid down by a river or deposited by wind, we are talking about superposition as the basis for that sequence. Superposition means that the oldest deposits would be at the bottom and the youngest deposits would be on the top, in kind of layer cake fashion. So that principal has served us very well. If we have no means by which to absolutely date materials, we can still work out a sequence of events – that can be extremely important. So relative dating was really the only mechanism that people had available for dating archaeological and paleontological materials until the 20th century. There were a few absolute dating methods, and by absolute, I mean dating with respect to a measured time series. In other words, being able to place something in terms of a calendar– dating in terms of years. There were a few techniques that could be used in certain situations – counting of annual cycles in glacial lakes – we call these cycles “varves”. Counting those annual cycles of sediment deposition could actually allow us to determine the age of these lake deposits if they continued up to the present day. Or the use of tree ring dating – counting the rings in trees if we have logs preserved in a fairly recent site and could relate it to some known historic trees. Those were absolute dating techniques. But for the most part, until the 20th century, relative dating was the basis for archaeological, paleontological and geological dating."
Views: 674 Museum of Archaeology & Ethnology at SFU
With the debate about global climate change raging as fervent as ever, it would be nice if there was a way to go back hundreds and thousands of years to figure out just how unusual the current climate is. Researchers at the University of Arkansas's Tree Ring Lab know just how to do that.
Views: 1074 University of Arkansas
Part three in the series with the history and detail of tree ring dating
Views: 10884 Baud Bits
Researchers from the University of Florida and the University of Tennessee recently joined forces to settle a question for historians working to renovate one of the oldest historic properties in St. Augustine, Florida: the Ximénez-Fatio house.
Views: 912 futurityvideo
Swansea Geography Professors Mary Gagen and Danny McCarroll chat about the ground-breaking tree ring research used in the archaeological dating of Llwyn Celyn from tonight's new Landmark Trust series.
Views: 33 College of Science, Swansea University
If environmental change affects tree growth, what is tree ring science revealing about climate change? Full 51 min talk available on DVD at the CMI webstore. http://creation.com/store_redirect.php?sku=30-9-575 Related Articles: In Six Days: Geoff Downes, forestry research: http://creation.com/geoff-downes-forestry-research-in-six-days A life of ups and downs: David Catchpoole chats with tree physiologist Dr Geoff Downes: http://creation.com/a-life-of-ups-and-downs Patriarchs of the forest: http://creation.com/patriarchs-of-the-forest Related Products: The Creation Answers Book - http://creation.com/store_redirect.php?sku=10-2-505 Creation Magazine subscription - http://creation.com/store_redirect.php?sku=90-3-003 Tree Rings, Dating and Changing Climates DVD - http://creation.com/store_redirect.php?sku=30-9-575 2009 Super Camp DVDs pack - http://creation.com/store_redirect.php?sku=90-7-586
Views: 1762 Creation Ministries International
3,400 years ago, a volcano in present-day Santorini - called Thera - erupted and obliterated the surrounding area. The Jindo takes a look at the different types of dating used to figure out exactly when the disaster took place. Article link: https://popular-archaeology.com/article/dating-the-ancient-minoan-eruption-of-thera-using-tree-rings/ Patreon: patreon.com/thejindo Twitter: twitter.com/thejindo Bitchute: bitchute.com/thejindo Minds: minds.com/thejindo
Views: 63 The Jindo
Researchers recently joined forces to settle a question for historians working to renovate one of the oldest properties in St. Augustine, Florida: the Ximénez-Fatio house. Source: Univ. of Florida For more information, visit: www.laboratoryequipment.com/news-tree-ring-dating-rewrites-history-061410.aspx
Views: 297 Laboratory Equipment
Tree Ring dating was a major breakthrough in dating in dating the earth and human artifacts. This has been scientifically dated to about 3500 years. After this, the "science" is a good effort, but fails. It fails based upon a simple principle: trees grow more densely when crowded out by more mature trees. Stated another way, when the canopies of mature trees overshadow saplings, those saplings grow to be more dense. Charles Lyell (a liar) invented a theory called Stratigraphy. This was the mother of "millions and billions of years". Geology has based their assignment of dates to layers of earth based on Stratigraphy. Archeology also based their system on Stratigraphy. Today, If you ask a Geologist how a layer of earth is dated, they will tell you it is based upon the dating of artifacts found therein. If you ask an Archeologist how the artifacts are dated, he will tell you it is dated according to the layer of earth in which it was discovered. ???????????????????????????????????????? ?????? That is a circular argument. They both date based on each other. The real origin of dating goes back to Stratigraphy and Charles Lyell.
Views: 2270 KnowJesusKnowPeace
The explosive eruption of the volcano Thera on Santorini more than 3,400 years ago buried the Minoan settlement on the island in a layer of ash and pumice more than 130 feet (40 meters) deep. The effects of the eruption were felt as far away as Egypt and what is now Istanbul in Turkey. New analyses that use tree rings could settle the long-standing debate about when Thera erupted by resolving discrepancies between archeological and radiocarbon methods of dating the eruption, according to new University of Arizona-led research. “It’s about tying together a timeline of ancient Egypt, Greece, Turkey and the rest of the Mediterranean at this critical point in the ancient world — that’s what dating Thera can do,” said lead author Charlotte Pearson, an assistant professor of dendrochronology at the UA Laboratory of Tree-Ring Research. See the full story at https://uanews.arizona.edu/story/dating-ancient-minoan-eruption-thera-using-tree-rings
Views: 4297 The University of Arizona
DENDROCHRONOLOGY or tree-ring dating is the scientific method of dating based on the analysis of patterns of tree rings, also known as growth rings. Dendrochronology can date the time at which tree rings formed, in many types of wood, to the exact calendar year. This has three main areas of application: PALEOECOLOGY, where it is used to determine certain aspects of past ECOLOGIES (most prominently climate); ARCHAEOLOGY, where it is used to date old buildings, etc.; and RADIOCARBON DATING, where it is used to CALIBRATE RADIOCARBON AGES. In some areas of the world, it is possible to date wood back a few thousand years, or even many thousands. Currently, the maximum for fully anchored chronologies is a little over 11,000 years from present.
Views: 102 NAZAS RIVER
Charlotte Pearson, a research scientist at the University of Arizona Laboratory of Tree-Ring Research, explains how counting tree rings is more precise than radiocarbon dating, using an ancient beam from St. Mark's palace in Venice. Tom Beal/Arizona Daily Star
Views: 415 Arizona Daily Star
I talk about how ice layers and tree rings are falsifiable. These are yet two more reasons evolutionists have faith in the false dating system's and a old earth. They don't disprove 6000 year old earth. For more about the Bible or creation, check out my channel and subscribe, we will be doing many video's about the Bible and creation science.
Views: 184 George Praisehim
David Stahle travels to ancient forests around the world, collecting tree rings to learn more about major climate and historical events dating back hundreds and thousands of years. With help from the National Science Foundation, he uses Dendrochronology, or tree-ring dating, to get a snapshot of climate change over time. Stahle can also determine things like the socioeconomic impact of droughts. In fact, in 1998, he made the front page of the New York Times with his discovery that drought could have contributed to the disappearance of colonists in Jamestown. He also found that 1587 was the driest year in 800 years. Stahle runs the Tree-ring Lab at the University of Arkansas and what he and fellow tree-ring researchers are learning is that a trend of global warming began in the 1800s and continues today, brought about by changes in tropical sea surface temperatures of no more than a few tenths of a degree Celsius. Today Stahle is working with hydrologists and government planners in California and throughout Mexico to plan for drought and climate change events. For more Science Nation: Subscribe: http://www.youtube.com/subscription_center?add_user=VideosatNSF or Youtube Playlist: http://www.youtube.com/playlist?list=PL833118C47C3E8362 or http://www.nsf.gov/news/special_reports/science_nation/index.jsp .
Views: 40032 National Science Foundation
Shot in 2006, this story shows how the Quincentennial Bur Oak Tree in Plano was dated.
Views: 524 City of Plano
[Richard Fangrad & Calvin Smith] Trees are among the oldest living things on the planet. Some say longer than biblical Creation would allow. Dendrochronology is the science dealing with the study of the rings of trees in determining the dates and chronological order of past events. Learn why it is a help rather than a hindrance to the biblical chronology.
Views: 46 BibleTruth101
Trees are outstanding historians. In fact, scientists dating back to Leonardo da Vinci recognized the value of trees. While others had figured out that you could determine the age of a tree by counting its growth rings, da Vinci went beyond that basic knowledge. Source: NSF Read More: www.laboratory.com/News-tree-rings-provide-climate-record-040511.aspx
Views: 285 Laboratory Equipment
Discussing the assumptions made in tree ring dating. Tree ring dating is used to attempt to verify carbon dating, and both rely heavily upon assumptions, which causes a circular reasoning pattern in logic. - http://www.creationliberty.com More details on carbon dating, tree-ring dating, and ice core dating: http://www.creationliberty.com/articles/carbondating.php
Views: 1435 Christopher Johnson
An angry atheist attempts to stump Kent Hovind and it does not go well for the angry man (amusing). If you have a question for Kent Hovind on creation or evolution feel free to ask (see how below) Official Kent Hovind Websites http://www.freekenthovind.com http://www.2peter3.com Additional Grassroots Hovind Support Websites http://www.clubcreation.org/ http://freekent.com/ Social Media: https://www.facebook.com/pages/Free-Kent-Hovind/110281362328735 https://twitter.com/FreeKentHovind Dr.Kent Hovind's Teaching Materials & DVDs: http://creationtoday.org/?s=kent+hovind&post_type=product Nine of Dr.Kent Hovind's Thirty-Seven E-Books Written From Prison: http://www.lulu.com/shop/search.ep?keyWords=kent+hovind&type= Kent’s Converts Prison Ministry & Discipleship (Kent has led nearly 800 inmates to Jesus) https://kentsconverts.wordpress.com/ If you have question for Dr. Hovind on Creation, Evolution, Dinosaurs, or the Bible email them to: [email protected] If Pastor Hovind has impacted your life you can record your personal testimony at: (972) 839-9848 Write Letter to Kent Hovind at: Santa Rosa County Jail C/O Kent Hovind P.O. Box 7129 Milton, Fl. 32572 #FreeKent #LetMyPastorGo
Views: 556 LoneStar1776
Eric Hovind is back, and he's here to tell us why the field of dendrochronology is fake science! Mistake at 5:00 I meant to say "Spring and possibly Summer", not "Spring and possibly Winter". Paulogia's response to Eric Hovind: https://youtu.be/3uhExZI1Txs Support me on Patreon: https://www.patreon.com/user?u=3308388 Follow me on Twitter: https://twitter.com/StickProfessor Become a Member: https://www.youtube.com/channel/UCbjw7dE_hxJT-VGLTqCjlJA/join Check out my merch: https://teespring.com/stores/professorstick Join us on my Discord: https://discord.gg/NsnSvRW Original Video: https://www.youtube.com/watch?v=hB0slz49GCk ------------------------------------------------------------------------------------------------- ♫ Finn and Jake, by WVLF and Uth Fruit https://youtu.be/4m6DBP9iVDY WVLF: https://soundcloud.com/w-v-l-f Uth Fruit: https://soundcloud.com/listentofruit FAIR USE NOTICE: This video may contain copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes.
Views: 108870 Professor Stick
This video was created for Penn State's Earth 103: Global Finance for the Earth, Energy, and Materials Industries (https://www.e-education.psu.edu/earth103/) with the assistance of Tim Bralower, David Bice and the John A. Dutton e-Education Institute (https://www.e-education.psu.edu/)
Views: 12551 Dutton Institute
Trees are among the oldest living things on the planet. Some say longer than biblical Creation would allow. Dendrochronology is the science dealing with the study of the rings of trees in. [Richard Fangrad vesves Calvin Smith] Trees are among the oldest living things on the planet. Some say longer than biblical Creation would allow. Dendrochronology is the science dealing with the. A popular myth is that radioactive dating methods confirm the geologic time-scale and the concept of human evolution. The methods appear so impressive that many Christians accept them as evidence.
Views: 1 cusk futz
If environmental change affects tree growth, what is tree ring science revealing about climate change? Full 51 min talk available on DVD at the CMI webstore — creation.com/store
Views: 1006 JJjayco
HURT out now! https://olivertree.lnk.to/Hurt Directed by: Oliver Tree - https://instagram.com/olivertree & Brendan Vaughan - https://instagram.com/brendanthevaughan Written by Oliver Tree Video Produced by: Snow Beach - https://snow-beach.com & 23/32 Films - http://www.2332.com.ua/ CONNECT WITH OLIVER TREE: https://instagram.com/olivertree http://olivertreemusic.com https://twitter.com/olivertree https://facebook.com/olivertreemusic https://soundcloud.com/olivertree #OliverTree #Hurt #UglyIsBeautiful
Views: 13226293 Oliver Tree
Tree rings helped scientists date ancient Greek eruption Tree rings helped scientist pinpoint the date of ancient Greek volcanic eruption. Photo by Bob Demers/UA News Aug. 17 (UPI) -- Tree ring analysis has helped scientists pinpoint the date of Thera's eruption. The volcano on the Greek island of Santorini erupted sometime during the 15th or 16th century BC, but scientists have previously been frustrated by discrepancies between radiocarbon and archaeological evidence of the ancient eruption's precise timing. "It's about tying together a timeline of ... ----------------------------- Don't forget Subscribe: https://www.youtube.com/channel/UC1ReW40NAEs6fVFk6Av97sQ?sub_confirmation=1
Views: 4 GR News
🎧Stream / Download Family Tree now - https://Ramz.lnk.to/FamilyTreeID ✏️ Ramz pays homage to his "Family Tree" in his brand new single and video. Prod. By Fraster T Smith & 169 Video Directed by Kaylum Dennis Follow Ramz: Instagram: @ramonerochester Snapchat: RamoneRochester Twitter: @ramonerochester 🚨 SUBSCRIBE: http://bit.ly/GRMsubscribe 📰 VISIT: http://grmdaily.com/ ✅ DOWNLOAD THE GRM APP FOR iPHONE & iPAD NOW: https://itunes.apple.com/us/app/grm-daily/id1170798576 ▶ DOWNLOAD FOR ANDROID NOW: https://play.google.com/store/apps/details?id=com.grmdaily.grmdaily WWW.GRMDAILY.COM @GRMDAILY TWITTER : http://www.twitter.com/grmdaily FACEBOOK : http://www.facebook.com/grmdaily INSTAGRAM : https://www.instagram.com/grmdaily -~-~~-~~~-~~-~- Check out J Styles - Daily Duppy https://www.youtube.com/watch?v=KToXKXWscJ0 -~-~~-~~~-~~-~-
Views: 25014766 GRM Daily
Original file date: Sun, 29 Mar 2015, ID:nyr68x Trees respond to water like all living things, and they make useful records of dry and wet seasons. When it’s wet, the trees flourish. When it’s dry, they’re stressed. All those responses show up in a tree’s rings. Using those ring records, dendrochronologists have been able to take a look back in time and get a sense of water and drought in the West. Last month, scientists at Utah State University, Brigham Young University and The U.S. Forest Service announced they’d traced the Bear River’s stream flow back 1,200 years. That’s long before Mormon pioneers started building the first towns and cities in the area, and longer than any other tree-ring record in northern Utah to date. “One of the key messages is there is no ‘normal,’” said Roger Kjelgren, a professor and plant scientist at USU. “(Northern Utah) really is like a grandfather clock. It oscillates back and forth, moving between orbiting around a dry period and then shifting and oscillating back to a wet period.” The trick is lining up all that wet-dry variation with climate models. Climate models do a good job at predicting temperatures, but they’re not as good at predicting future precipitation. That’s where the trees can help. “I wouldn’t say it’s a match made in heaven, but it’s kind of a jigsaw-puzzle fit, taking the past tree record from the tree rings and combining it with the climate models to get an idea of these cycles,” Kjelgren said. During a wet season, trees drink in water and grow proportionally. As the season dries, they harden and cell walls get darker. That’s how tree rings form. During dry years, the rings will be tiny, sometimes requiring a microscope to see. The Bear River tree-ring study went back 1,200 years with the help of Utah juniper trees, a particularly finicky and telling species when it comes to water. “It maintained its sensitivity going back in time,” said Justin DeRose, a U.S. Forest Service scientist and the lead author of the study. “So we decided to go with Utah juniper against the advice of some folks.” When dendrochronologists study trees, they don’t just look at live ones. They scavenge for dead wood in the area, then line up the tree-ring records of dry and wet periods. The process, called cross-dating, helps scientists take the chronology back further in time. “It also helps us work out any problems if there are particularly bad years, and some trees deiced not to grow a ring on a part of the stem which is called an absent ring, by having a couple of cores per tree or cross sections, can find out where those occur across multiple trees,” DeRose said. Juniper are “sensitive” because their variability in tree-ring width is high compared to other trees. “For Utah juniper, everything’s’ this year. It lives for today, it’s very Zen-like,” Kjelgren said. “It lives in the now, and if there’s no water it doesn’t grow. If there is water, particularly in the springtime, it puts everything it can into foliage and trunk growth.” In drier climates, like the Southwest, juniper trees often have false rings because the region typically has two wet seasons — spring runoff and summer monsoons. The region is also prone to long drought, which means junipers won’t grow any rings at all. That’s not the case in northern Utah. “Up here, we have one distribution of precipitation — we get precipitation in the winter, we get snowmelt, then in the summer it’s dry,” De Rose said. “It’s one of the reasons we love living here. Utah juniper thrives in dry, rocky areas, where older specimens are often better preserved. It’s also one of the most prolific trees species in the state. The ancient Utah juniper DeRose analyzed in his study fo...
Views: 5 Standard-Examiner
The rings that a tree forms in its wood, are a measure of the tree's growth and age. A new ring is formed each year, so you can tell how old a tree was by counting the rings on the stump. The size and spacing of the rings relate to the growing conditions during the tree's lifetime. A series of narrow rings indicates a period of drought or competition from neighboring trees which slowed growth while wide, evenly spaced rings means growing conditions were good. Fire and insect damage leave scars, and some trees even show scars from animal scratchings. http://mdc.mo.gov/conmag/1996/10/70.html
Views: 11353 Missouri Trees
Scientists are studying tree rings to learn about changes in climate over hundreds of years. BBC News reports on how the width of the rings can give clues to rainfall, temperature and even tsunamis.
Views: 1772 CBS News