News

2019-11-13: Lab alum and PhD graduate Dan Ackerman profiled by the UMN Department of Ecology, Evolution & Behavior for his science journalism work with American Public Media. More here.


2018-12-04: Former lab member Kate Carlson defended her undergraduate honors thesis in geography today! Her thesis, "Visualization of Movement and Interaction", examined new approaches to dynamically visualize spatial and temporal data. Congrats Kate!


2018-09-17: Several from the lab group headed to Colorado for the 2018 MtnClim Conference at the Rocky Mountain Biological Lab. We stopped for fieldwork both coming and going, sampling tree rings from ancient Douglas-fir and Rocky Mountain bristlecone pine. So happy to have new grad students Siiri Bigalke and Daniel Crawford in the lab group!


2018-08-01: Matthew Trumper, an honors undergrad in geography and statistics, worked with support from a National Science Foundation (NSF) REU in the Griffin Lab this summer. His project is examining stable nitrogen isotope variations of tree rings from a long-term controlled burn experiment.

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2018-06-10: Winding down the 10th WorldDendro Fieldweek in Bhumthang. It has been an honor and privilege to work with Dr. Bethany Coulthard and with the basic dendro group, comprised of 16 undergraduate forestry students from Bhutan, Nepal and India.


2018-06-01: The 10th WorldDendro Congress has begun in Bhutan. Today a bunch of us visited Paro Taktsang (The Tiger's Nest), among the most sacred of all Buddhist Monasteries. Tomorrow we're off to Bhumthang for the fieldweek with an exceptional group including Ed Cook, Paul Krusic, Jonathan Palmer, Kathy Allen, Kevin Anchukaitis, Neil Pederson, Andy Bunn, Kristina Seftigen, Jesper Bjorklund, Bethany Coulthard, Jim Speer, Santosh Shah, Jill Harvey, Jessie Pearl, Talia Anderson, Dan Griffin, and many more. The actual conference begins in Thimphu on June 10.

2018-04-09: The annual AAG meeting is this week in New Orleans and the Dendro group will be representing with some great research:

WED 8:00 a.m. - 9:40 a.m. Physical Geography Posters: Trees, Soil, Fire, Hazards (Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor)

    • 008 - High Resolution Imaging and Browser Based Measurement in Dendrochronology: Kate Carlson*, Malik Nusseibeh, Colin McFadden, Samantha Porter, Matthew Trumper, & Daniel Griffin
    • 014 - Response of a willow shrub (Salix pulchra) to rising arctic temperature: Erin Jones*, Daniel Ackerman, & Daniel Griffin
    • 032 - Red Pine Cambial Phenology in Northern Minnesota: complimentary approaches to determining phenology of radial growth: Emily Nagel*, Kurt Kipfmueller, & Daniel Griffin
    • 034 - Mapping old growth communities using time series aerial photo analysis in a Minnesota oak savanna: Madison Sherwood*, Tanner Johnson, Ryan Mattke, & Daniel Griffin
    • 058 - Addressing the spatial gap of drought-sensitive tree-ring chronologies in southern Minnesota: Matthew Trumper*, Whitney Delong, Kate Carlson, & Daniel Griffin


THU 8:00 a.m. 8:00 a.m. - 9:40 a.m. Physical Geography Posters: Water (Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor

    • 030 - Searching for Flood Rings in Quercus macrocarpa on the Lower Chippewa River: Lindsey Kurtz*, Matthew Trumper, Doug Faulkner, & Daniel Griffin


THU 8:00 a.m. 8:00 a.m. - 9:40 a.m. Dendrochronology I: Frontiers in Dendrochronology (Invited) Grand Ballroom C, Astor, 2nd Floor (Paper; Sponsored by Biogeography Specialty Group, Paleoenvironmental Change Specialty Group)

    • 9:20 - Multi-Proxy Reconstructions of Northeast Pacific Decadal Variability from trees and bivalves: Bryan Black* & Daniel Griffin


THU 1:20–3:00p.m.Dendrochronology III: DendropyrochronologyGrand Ballroom C, Astor, 2nd Floor (Paper; Sponsored by Biogeography Specialty Group, Climate Specialty Group, Paleoenvironmental Change Specialty Group)

  • 1:40 A fire history of the Bois Brule River and a historic canoe portage route in Northern Wisconsin: Liam Martin* & Kurt Kipfmueller
  • 2:20 Building a fire history network in the Upper Great Lakes: Kurt Kipfmueller*, Evan Larson, Lane Johnson, Elizabeth Schneider, Liam Martin, Adam Donaldson


THU 3:20–5:00p.m. Dendrochronology IV: Dendroclimatology Grand Ballroom C, Astor, 2nd Floor (Paper; Sponsored by Biogeography Specialty Group, Climate Specialty Group, Paleoenvironmental Change Specialty Group)

    • 4:00 The long-term context for recent drought: Insights from streamflow and precipitation reconstructions for southern California: Erica Bigio*, Connie Woodhouse, Dave Meko, & Daniel Griffin
    • 4:20 Climate extremes and tree rings in California: Daniel Griffin*, Jacob Arndt, Matthew Trumper, & Erica Bigio


FRI 10:00–11:40a.m. Physical Geography Posters: Climatology (Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor)

    • 030 - Testing the effects of signal-free detrending on climate signals recovered from tree-ring networks: Mara McPartland* & Scott St. George


FRI 10:00–11:40a.m. Landscape Speciality Group-Student Presentation Competition II Estherwood, Sheraton, 4th Floor

    • 10:00 Spatial Patterns in the Historic Fire Regime of a Fragmented Landscape: Elizabeth Schneider*, Kurt Kipfmueller, Evan Larson, Bennet Grider



2018-04-01: Dan Ackerman has been awarded a 2018 AAAS Mass Media Science Fellowship. This summer, he will be working in NYC with Scientific American. Congrats!

2018-03-06: Ackerman's second shrub chronology paper is in press at Environmental Research Letters. In this study, analysis of the new network of Salix pulchra ring-width data demonstrate a robust, region wide response of shrub growth to (only) June temperature. The work has been getting some nice science media coverage as well. For example, here is the news release on ScienceDaily.

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Griffin Lab & Minnesota Dendro CollectiveDepartment of Geography, Environment & Society UNIVERSITY OF MINNESOTA