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DATA-MODEL ASSIMILATION CHALLENGES AND
OPPORTUNITIES IN THE LTER PROGRAM
Debra PetersDebra Peters
Lead Research Scientist, USDA ARS, Jornada Experimental Range, Las Cruces, NM 88003-0003. [email protected]
Lead Principal Investigator, Jornada Basin Long Term Ecological Research program
Landscape Linkages
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Long Term Ecological Research Network:
- national-level network funded continuously since 1980
- 26 sites and a network office
- funded in 6 year increments by the National Science Foundation
http://www.lternet.edu
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LTER network contains diverse ecosystems with common environmental problems – How can we understand and predict dynamics?Are there general principles and
properties across sites?
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LTER from 1980 to 2004+: focus on site-based science and long-term data
1998
grasslands 8%
shrublands 92%
1858
Grasslands
1915
grasslands 37%
shrublands 63%
0
300
600
900
1900 1920 1940 1960 1980 2000 2020
year
are
a (
ha)
shrubs
ecotone
grasses
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Human systems Natural systems
Ecosystemfunction
Biotic structureHuman behavior
Ecosystem services
Long-term “press”
Short-term “pulse”Human
outcomes
Events
Drivers
2000 – future: added focus on network-level science
Common conceptual framework for all sites
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LTER provides solid foundation for regional, continental, and global networks
http://www.p2erls.net/riogrande.html
Rio Grande Network
NM Energy Flux Tower Network(http://bosque.unm.edu/~cleverly/ ).
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50 sites (LTER, USFS, USDA ARS, DOE, USGS, UA)50 sites (LTER, USFS, USDA ARS, DOE, USGS, UA)
EcoTrends Project(www.ecotrends.info)
Led by Jornada LTER-ARS, NMSU
National-level networks build on LTER sites
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Objectives of EcoTrends Project
(1) to create a platform for synthesis by producing a
compendium of easily accessible long-term graphs and
data (> 10 years) from ecological research sites
- biogeochemistry
- biotic structure
- human economic and demographic
- climate
(2) to illustrate the utility of this platform in addressing
important within-site and network-level scientific
questions
To date, > 50 sites and > 400 datasets are
accessible through the EcoTrends project.
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(> 300 existing sites in the US to-date)Led by Jornada ARS-LTER, NMSU
Global Network: Pole-to-Pole Ecological Lattice of Sites (P2ERLS); global “network of networks” (
http://www.p2erls.net)
Web portal to information about research sites
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Opportunities
- Data and site information are available for
use in models in derived, easy-to-use format
(EcoTrends, P2ERLS)
- Long-term datasets and sites can be added
(EcoTrends)
- Sites can be added to continental to global
networks accessed via web portals (P2ERLS)
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Cedar Creek Kellogg Shortgrass steppe Jornada
Harvard Forest Hubbard Brook Coweeta Andrews
Palmer Drought severity index (1895-2003)
Compare same data from many different sites
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Jornada ARS- LTER (New Mexico)State changes through time
(Laliberte et al. 2004)
Santa Barbara Coastal LTER (California)Change in fish species composition with time
Compare similar dynamics in different sites
Desert in NM Kelp forest off CA coast
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Products
1. Folio-sized book to be submitted in Jan 2008 to Oxford Univ. Press
2. Website (data, metadata) for synthesis and analysis of static data (http://www.ecotrends.info)
Opportunities
Accessibility of many long-term data sets for modeling and synthesis activities