Barchan dunes stabilized under recent climate warming on the northern Great Plains
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Bibliographic record
Abstract
Research Article| November 01, 2009 Barchan dunes stabilized under recent climate warming on the northern Great Plains Stephen A. Wolfe; Stephen A. Wolfe * 1Geological Survey of Canada, Natural Resources Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada *E-mail: swolfe@nrcan.gc.ca. Search for other works by this author on: GSW Google Scholar Christopher H. Hugenholtz Christopher H. Hugenholtz 2Department of Geography, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen A. Wolfe * 1Geological Survey of Canada, Natural Resources Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Christopher H. Hugenholtz 2Department of Geography, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada *E-mail: swolfe@nrcan.gc.ca. Publisher: Geological Society of America Received: 22 Apr 2009 Revision Received: 19 Jun 2009 Accepted: 26 Jun 2009 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2009 Geological Society of America Geology (2009) 37 (11): 1039–1042. https://doi.org/10.1130/G30334A.1 Article history Received: 22 Apr 2009 Revision Received: 19 Jun 2009 Accepted: 26 Jun 2009 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Stephen A. Wolfe, Christopher H. Hugenholtz; Barchan dunes stabilized under recent climate warming on the northern Great Plains. Geology 2009;; 37 (11): 1039–1042. doi: https://doi.org/10.1130/G30334A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract We use light detection and ranging (LIDAR) imagery and optical stimulation luminescence dating to show that stable parabolic dunes on the Canadian prairies originated from active barchan dunes ~200 years ago. Residual dune ridges, marking former lower stoss slope positions of migrating dunes, record the transformation of barchan dunes to parabolic dunes between A.D. 1810 and 1880. Parabolic dunes stabilized by ca. A.D. 1910, with a few larger dunes and blowouts still active today. A dry, cool climate permitted sand transport to out-compete vegetation stabilization and, with lowered water tables, maintain desert-like barchan dunes with bare interdune sand sheets. These findings explain why dune fields of the southern Canadian prairies are currently more active than those of the United States Great Plains and the observation that dunes have stabilized under twentieth century warming. Our results emphasize the importance of viewing dune field responses to short-term disturbances in the context of longer-term system response, particularly when relatively modest climatic changes can cause major shifts in dune activity. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it