Title:Greenup values for interior alaska 1976 - Present
Creator(s):Anderson, Jim (Data Originator)
Elsner, Cobb (Data Originator)
Fathauer, Ted (Data Originator)
Euskirchen, Eugenie S. (Affiliated Scientist)
Core Data Contact:McGuire, A. David (Core Responsibility)
Abstract:Greenup, the frequent rapid transformation of Interior Alaska from Brown space to spring green as the leaves deciduous trees burst forth, is suddenly enough to allow assignment of a single date in a given area to this culmination of a key biological process. Greenup is important for more than just an aesthetic or biological perspective. For example, once Greenup has occurred, there is a rapid increase in evapotranspiration. Which in turn has important consequences in the areas mesoscale meteorology. Here, dates for green around Fairbanks for more than 20 springs are correlated against several different temperature derived indices calculated entirely from routinely available climatological data. We examined a variety of degree day statistics and temperature thresholds. The relationships between these parameters and Greenup dates in Interior Alaska should be useful in projecting future greenup dates. They may also be useful to post analyze Greenup dates in years for which there is meteorological data but no surviving record of Greenup dates.
Methods:Anderson (1986) defines Greenup as the date when 'leaf buds in Birch and Aspen open just enough to produce a faint but distinct green lush in the forest canopy'. Anderson and colleagues have observed the portal poorest Greenup on Eastern flank of Chena Ridge, visible to the southwest from the west ridge of the University of Alaska Fairbanks campus. Greenup dates for 1974, and 1976 through 2011, as observed and recorded by Jim Anderson or Cobb Elsner of the University of Alaska Fairbanks were obtained from Mr. Anderson. Additionally, and independent from Anderson's work, Greenup dates for 1986, and 1988 through 2011, were observed and recorded from one of the authors, Ted Fathauer. Fathauer visually examine the south end of Chena Ridge, and look for a distinct green coloration in the forest.
Keywords:bud burst, greenup, plant phenology
Categories:Climate, Primary Production, Vegetation
Study Period:1976-05-04 to 2017-05-08
Bounding Box:
West Longitude: -147.989281°
North Latitude: 64.811258°
East Longitude: -147.989281°
South Latitude: 64.811258°
Site References:

ChenaRidgeSouth: This is the general area where bud burst data has been collected.

Data Columns:
1yearyyyyObservation year
2monthmmMonth of bud burst
3dayInMonthddDay of bud burst (day in Month)
4julian day (taking into account leap years)julian day of bud burst (taking into account leap years)
Data File(s): 300_ChenaRidgeLeafOut_2017.txt (0.66K, 43 rows)
year,month,dayInMonth,julian day (taking into account leap years)
... (43 rows total)
Image File(s): There are no image files available with this data package.
Supplemental File(s): Leaf-out_1976-2011.pdf
Metadata Formats: Full Metadata (HTML format)
EML (Ecological Metadata Language - XML format)
Public Release:2017-05-08
Network Data ID:knb-lter-bnz.300.24
Publications: Currently no publications.
Data Citation:Anderson, Jim; Elsner, Cobb; Fathauer, Ted; Euskirchen, Eugenie S. 2017. Greenup values for interior alaska 1976 - Present, Bonanza Creek LTER - University of Alaska Fairbanks. BNZ:300, doi:10.6073/pasta/08050a3f7b1fbc5ae7cac378feaaa6f1
Data Acknowledgement:Data are provided by the Bonanza Creek LTER, a partnership between the University of Alaska Fairbanks, and the U.S. Forest Service. Significant funding for collection of these data was provided by the National Science Foundation Long-Term Ecological Research program (NSF Grant numbers DEB-1636476, DEB-1026415, DEB-0620579, DEB-0423442, DEB-0080609, DEB-9810217, DEB-9211769, DEB-8702629) and by the USDA Forest Service, Pacific Northwest Research Station (Agreement # RJVA-PNW-01-JV-11261952-231).
UAF is an affirmative action/equal opportunity employer and educational institution.