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Glacier National Park Summer Drought Reconstruction
Entry ID: NOAA_NCDC_PALEO_2006-008

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Summary
Abstract: This data set consists of a reconstruction of summer drought based on tree-ring
chronologies in Glacier National Park. Reconstructed parameter is Mean Summer
Deficit (precipitation - potential evapotranspiration [Thornthwaite, 1948] for
June-August) at Kalispell, Montana on the boundary of Glacier National Park.

Abstract
Instrumental climate records suggest that summer precipitation and winter
snowpack in Glacier National Park (Glacier NP), Montana, vary significantly
over decadal to multidecadal time scales. Because instrumental records for the
region are limited to the twentieth century, knowledge of the range of
variability associated with these moisture anomalies and their impacts on
ecosystems and physical processes are limited. The authors developed a
reconstruction of summer (June-August) moisture variability spanning A.D.
1540-2000 from a multispecies network of tree-ring chronologies in Glacier NP.
Decadal-scale drought and pluvial regimes were defined as any event lasting 10
yr or greater, and the significance of each potential regime was assessed
using intervention analysis. Intervention analysis prevents single intervening
years of average or opposing moisture conditions from ending what was
otherwise a sustained moisture regime. The reconstruction shows numerous
decadal-scale shifts between persistent drought and wet events prior to the
instrumental period (before A.D. 1900). Notable wet events include a series of
three long-duration, high-magnitude pluvial regimes spanning the end of the
Little Ice Age (A.D. 1770-1840). Though the late-nineteenth century was marked
by a series of >10 yr droughts, the single most severe dry event occurred in
the early-twentieth century (A.D. 1917-41). These decadal-scale dry and wet
events, in conjunction with periods of high and low snowpack, have served as a
driver of ecosystem processes such as forest fires and glacial dynamics in the
Glacier NP region.

Using a suite of paleoproxy reconstructions and information from previous
studies examining the relationship between climate variability and natural
processes, the authors explore how such persistent moisture anomalies affect
the delivery of vital goods and services provided by Glacier NP and
surrounding areas. These analyses show that regional water resources and
tourism are particularly vulnerable to persistent moisture anomalies in the
Glacier NP area. Many of these same decadal-scale wet and dry events were also
seen among a wider network of hydroclimatic reconstructions along a
north-south transect of the Rocky Mountains. Such natural climate variability
can, in turn, have enormous impacts on the sustainable provision of natural
resources over wide areas. Overall, these results highlight the susceptibility
of goods and services provided by protected areas like Glacier NP to natural
climate variability, and show that this susceptibility will likely be
compounded by the effects of future human-induced climate change.

Related URL
Link: GET DATA
Description: ftp access to drought reconstruction data


Link: VIEW RELATED INFORMATION
Description: Access to documentation and data


Geographic Coverage
 N: 48.2 S: 48.2  E: -114.31  W: -114.31

Data Set Citation
Dataset Originator/Creator: Pederson, G.T., S.T. Gray, D.B. Fagre, and L.J. Graumlich
Dataset Title: Glacier National Park Summer Drought Reconstruction
Dataset Series Name: IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-008
Dataset Release Date: February 2006
Dataset Release Place: Boulder, CO
Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology
Other Citation Details: NOAA/NCDC Paleoclimatology Program
Online Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/mon...


Temporal Coverage
Start Date: 1540-01-01
Stop Date: 2000-12-31


Paleo_Temporal_Coverage
Paleo Start Date: 500 ybp
Paleo Stop Date: 0 ybp
Chrono Unit:


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MONTANA


Data Resolution
Temporal Resolution: annual


Science Keywords
ATMOSPHERE >ATMOSPHERIC PHENOMENA >DROUGHT    [Definition]
PALEOCLIMATE >LAND RECORDS >TREE RINGS    [Definition]
PALEOCLIMATE >PALEOCLIMATE RECONSTRUCTIONS >DROUGHT/PRECIPITATION RECONSTRUCTION    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Project
PAGES >Past Global Changes, IGBP    [Information]


Keywords
drought reconstruction
tree ring chronologies
Glacier National Park
decadal-scale drought


Data Set Progress
COMPLETE


Originating Center
NOAA/NCDC


Data Center
World Data Center for Paleoclimatology, Boulder    [Information]
Data Center URL: http://www.ncdc.noaa.gov/paleo/

Data Center Personnel
Name: WDC/PALEOCLIMATOLOGY, BOULDER
Phone: +1 (303) 497-6160
Fax: +1 (303) 497-6513
Email: paleo at noaa.gov
Contact Address:
World Data Center for Paleoclimatology
NOAA/NCDC Code E/GCx3
325 Broadway
City: Boulder
Province or State: CO
Postal Code: 80303
Country: USA



Distribution
Distribution_Media: online ftp
Distribution_Format: ascii
Fees: none


Personnel
GREGORY T. PEDERSON
Role: INVESTIGATOR
Email: gpederson at usgs.gov
Contact Address:
Big Sky Institute
Montana State University
City: Bozeman
Province or State: MT
Postal Code: 59717
Country: USA


STEPHEN T. GRAY
Role: INVESTIGATOR
Phone: (406) 994-7023
Email: sgray at montana.edu
Contact Address:
Big Sky Institute
Montana State University
City: Bozeman
Province or State: MT
Postal Code: 59717
Country: USA


DANIEL B. FAGRE
Role: INVESTIGATOR
Phone: 406-888-7922
Fax: 406-888-7990
Email: dan_fagre at usgs.gov
Contact Address:
USGS-NRMSC
Science Center,
c/o Glacier National Park
City: West Glacier
Province or State: Montana
Postal Code: 59936-0128
Country: USA


LISA J. GRAUMLICH
Role: INVESTIGATOR
Phone: (406) 994-5178
Fax: (406) 994-5122
Email: lisa at peak.mrc.montana.edu
Contact Address:
Mountain Research Center
Montana State University - Bozeman
City: Bozeman
Province or State: MT
Postal Code: 59717-3120
Country: USA


Publications/References
Pederson, G.T., S.T. Gray, D.B. Fagre, and L.J. Graumlich. 2006.
Long-Duration Drought Variability and Impacts on Ecosystem Services: A Case
Study from Glacier National Park, Montana. Earth Interactions, Volume 10,
Paper 4, January 2006.

Creation and Review Dates
DIF Creation Date: 2006-03-13
Last DIF Revision Date: 2016-01-27



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