May 22, 2015
A multi-proxy record of hydroclimate, vegetation, fire, and post-settlement impacts for a subalpine plateau, central Rocky Mountains, U.S.A.
By Lesleigh Anderson (GECSC), Andrea Brunelle, and Bob Thompson (GECSC). Published in The Holocene.
This study compares post-settlement disturbance in the central Rocky Mountains in northwest Colorado to long-term patterns of the last few millennia. The research indicates that vegetation and fire regimes changed significantly in response to hydrologic change of the last two thousand years, and post-settlement disturbance was superimposed upon the resulting landscape.
May 15, 2015
Preliminary methodology to assess the national and regional impact of U.S. wind energy development on birds and bats
By Jay Diffendorfer (GECSC), Julie Beston (GECSC), Matt Merrill, Jessica Stanton, Margo Corum, Scott Loss, Wayne Thogmartin, Doug Johnson, Richard Erickson, and Kevin Heist. USGS Scientific Investigations Report 2015-5066.
This report presents a methodology, developed by the USGS, that assesses the impacts of wind energy development on wildlife. It is currently applicable to birds and bats, focuses primarily on the effects of collisions, and can be applied to any species that breeds in, migrates through, or otherwise uses any part of the United States. The methodology is intended to assess species at the national scale and is fundamentally different from existing methods focusing on impacts at individual facilities.
May 8, 2015
The WAIS Divide deep ice core WD2014 chronology—Part 1: Methane synchronization (68-31 kaBP) and the gas age-ice age difference
By Christo Buizert, Kurt Cuffey, Jeff Severinghaus, Daniel Baggenstos, T.J. Fudge, Eric Steig, Bradley Markle, Mai Winstrup, Rachael Rhodes, Ed Brook, Todd Sowers, Gary Clow (GECSC), Hai Cheng, Lawrence Edwards, Michael Sigl, Joe McConnell, and Ken Taylor. Published in Climate of the Past.
The West Antarctic Ice Sheet Divide ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ~68,000 years at unprecedented temporal resolution. This report presents a chronology for the deep part of the core (67,800-31,200 years BP), which is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. The analysis of this ice core reveals the timing of atmospheric greenhouse gas variations relative to Antarctic climate, as well as the interhemispheric phasing of the "bipolar seesaw".