ARCSS130 A Half-Century of Change in Arctic Alaskan Shrubs: A Photographic-Based Assessment M. Sturm and C. Racine A Half-Century of Change in Arctic Alaskan Shrubs: A Photographic-Based Assessment 2005-06-06 Boulder, Colorado USA NSIDC: National Snow and Ice Data Center http://nsidc.org/data/arcss130.html Technical Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 x 1 303 492-2468 x

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA Investigator Matthew Sturm msturm@crrel.usace.army.mil 1 907 353-5183 1 907 353-5142

USA-CRREL-Alaska

P.O. Box 35170

Ft. Wainwright AK 99703-0170 Investigator Charles H. Racine cracine@crrel41.crrel.usace.army.mil 1 603 646-4519 1 603 646-4785

US Army CRREL

72 Lyme Road

Hanover NH 03755-1290 USA EARTH SCIENCE Biosphere Vegetation Vegetation Cover Climatology/Meteorology/Atmosphere Environment Alaska Alaskan North Slope Anaktuvuk River ARCSS130 ARCSS Data Coordination Center Atigun Gorge Ayiyak River Canning River Chandler River Colville River Horseshoe/Castle Ivishak River Kokolik River Kugururok River Kuparuk River Nanushuk River Nimiuktuk River Northern Alaska NSIDC > National Snow and Ice Data Center Oolamnagavik River OPP 0119374 Sag/Lupine confluence Sagwon SHEBA The Notch Upper Colville River Upper Killik River Upper Nigu River CAMERAS AIRCRAFT HELICOPTER 1948-01-01 1951-12-31 1999-01-01 2003-12-31 complete 68 70 -165 -145 CONTINENT NORTH AMERICA UNITED STATES OF AMERICA ALASKA GEOGRAPHIC REGION ARCTIC The images should not be published without the consent of the investigators. English NSIDC_ARCSS NSIDC National Snow and Ice Data Center http://nsidc.org Data Center Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA NSIDC_ARCSS NSIDC Arctic System Science Data Coordination Center http://nsidc.org/arcss/ Data Center Contact NSIDC ARCSS User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA DVD 11 GB TIFF Sturm, M., C. Racine, and K. Tape. 2001. Increasing shrub abundance in the Arctic. Nature 411: 546-547.

In this study, the locations of 193 old aerial photographs of northern Alaskan landscapes were rephotographed and assessed for changes in vegetation. The original photographs were taken over northern Alaska between 1948 and 1951, and the new photographs were taken between 1999 and 2003. The region covered by the original and repeat photographs stretches from the southern extent of the Brooks Range in the south to the Coastal Plain in the north, and from the Chukchi Sea in the west to the Canning River in the east. Approximate coordinates are 68°N to 70°N and 145°W to 165°W. The original photographs were taken by the U.S. military as part of geologic reconnaissance and exploration, and the method used to acquire them was to fly both sides of a river valley while photographing the river and the facing valley slopes. Of the several thousand original photographs, only a fraction were repeated for the purpose of assessing vegetation change. Repeat photographs were selected for geographic coverage and to produce the greatest likelihood of detecting vegetation change. The original and repeat photographs were then scanned and stored in TIFF format. Individual image file sizes range from 5 to 60 MB each, and the total file size for the data set is 11 GB. The photographs are distributed on a set of three DVDs. The images should not be published without the consent of the investigators.

CEOS IDN DIF 9.7 2005-06-06 2012-06-04 corrected distribution format