Skip Ribbon Commands
Skip to main content

Quick Launch > FLUXNET Blog
January 13
Large increase in the number of sites available free fair-use

​The AmeriFlux and CarboEurope groups recently changed the policies on a large number of site years. Of the 252 sites in the FLUXNET dataset, the data from 153 of the sites (667 site years) are now available free fair-use. Below is a chart showing the number of FLUXNET sites electing each policy by regional network.

Screen Shot 2012-01-13 at 4.58.27 PM.png

December 18 Status Update and Recent Statistics

We are hard at work processing the next data update but the current schedule has built in additional time to allow for gathering of new site years. The expectation is that the new dataset will not be ready until fall 2012 and that it will contain over 2000 site years of data, worth the wait! In the meanwhile, we have received over 500 changes to availability of site years in the existing dataset. We are processing these changes now and they should result in the addition of over 250 site years in the free fair-use version of the FLUXNET dataset.

Our AGU poster this year, featured statistics giving a glimpse into the activities and utilization of the  site. It also gives some graphs showing the utilization of sites in papers and the progress of papers toward publication.

We now have 519 users on the site with access to the free fair-use dataset, 113 of those users also have access to the Lathuile dataset, 123 of the 300 tower team members have accounts, and 161 young FLUXNET scientists have accounts on the system. The average number of downloads for each site year is 300. A chart showing the average downloads per site year by site is below.FLUXNETAvgDownloadsperSiteYearNov2011.jpg

There are 267 sites with flux/met data in the database. There are 28,352,118 half-hourly flux/met data points in the dataset in ~40 data types. The ancillary information collected at the sites including BADM data is currently 80,788 data points representing biological, soil, and other information. 

There are now over 125 papers in preparation or published using the LaThuile version of the dataset. The LaThuile dataset provide feedback regarding their status and sites used (55 teams have specified). Below is a graph showing the status and number of sites used for each of these papers.

A graph showing for the US sites the utilization per site in LaThuile dataset papers is below. The color coding indicates the status of the paper.
Screen Shot 2012-01-15 at 3.56.58 PM.png

A similar graph for the CarboEurope sites is below.

Screen Shot 2012-01-15 at 3.55.43 PM.png

A graph for the remaining sites (non-AmeriFlux and non-CarboEurope) is below.Screen Shot 2012-01-15 at 3.57.33 PM.png

The above graphs give some idea of the current status of the network and papers as of January 2012. If there are other graphs and statistics you would like to see us provide, please let us know.

October 19
Updated information

​A major update of contacts for AsiaFlux Towers has been received from AsiaFlux personnel and the web site has been updated. In addition, the October 2011 edition of FluxLetter was just posted.

June 08
Notes from FLUXNET Berkeley June 2011 workshop - Topic 2 Break-out

Variance, Uncertainty, & Data Products

Focused on three main topics


Variability arising from ecosystem and human causes

Interannual variability and anomalies

Variability arising from climate forcing


Characterization and quantification of errors


What are we missing


Disturbance not well represented in models

Define disturbance as natural component of ecosystems instead of stochastic events

Networks, and remote sensing do not capture longer time scale processes (e.g., processes with 30-50 year return periods)

Need flux tower chronosequences in much larger set ecosystem types

Character/severity of disturbance matters

Much effort in remote sensing towards developing data sets

Fire, insect outbreaks – lots of disagreement across products

Mismatch between what remote sensing can/is providing and what models need

To most effectively link carbon/water consequences of disturbances fluxnet/modeling community needs to define and communicate needs to remote sensing community


Interannual Variation and Anomalies

Interannual variability is hard to capture

Low variance hard to explain

Opportunity to evaluate capacity of models and remote sensing  to capture dynamics by focusing on big events/anomalies

Low hanging fruit to help understand what we can and cannot detect and model

Interannual variability/Event-based analysis

Hydrologic anomaly in 2011; European heat wave 2003/2010; Amazonian droughts

Need better information/understanding of drivers, particularly lagged or cumulative effects

Remote sensing of phenological anomalies and changes in seasonality

Exploit information at site level from webcams (Andrew, Lisa)


Uncertainty (in models and data)

Characterization of uncertainty is difficult

Multiple sources of error propagate through model results

Structural error, calibration error, forcing error, representation error (sampling uncertainty) – Enting et al.

Errors in met drivers and remote sensing inputs used for large scale models need more attention

Gaps in sampling 

Geography matters (but what can you do about it?)

How can we think about more effective sampling

Biogeographic stratification; clustering of remote sensing/ecoregions, etc

Stratification based on spatio-temporal variation in model outputs

Need community discussion of how to characterize and quantify sources and magnitudes of uncertainty; uncertainty products


Data Products

MODIS subsetting tool at ORNL DAAC provides model to apply other remote sensing data sets at fluxnet sites

One stop shopping is good (DAAC, NEX)

Preliminary wish-list includes

Field measured ecophysiological variables used by models (e.g., Vmax)

Medium spatial resolution (10-50 m) maps of model PFTs at fluxnet sites

Landsat archive (time series in support of for e.g.,  disturbance histories) 

Hi-Res Data (<1m) for upscaling (Quickbird, etc)

LIDAR: DESDynI is on hold, but still opportunies from airborne 

Hyperspectral (AVIRIS,Hyperion)

Need to lower barriers to access

Probably many others

Remotely sensed PAR

March 03
Over 356 site years available in the free fair-use dataset . . . .

​As of today, an additional ~150 site years are now available to free fair-use and open dataset users.  The reports on the web site have all been updated to reflect the new site years in each set.  Please let us know if you experience any problems.

February 13
Major addition to the opened and free fair-use site years coming soon . .

​We have been working with the data contributors to FLUXNET to evaluate whether it is now time to move many of the site years to free fair-use.  A large number of the site years that were previously only available in the LaThuile version of the dataset will be available in all three sets.  The new site years will appear in the set in the next month.  If you are a free fair-use user, please do your part by contacting the data contributors before publishing using their data.

December 08 upgraded!

Today we upgraded in three ways:

  1. we have much more powerful hardware
  2. we now run the latest Windows Server (Windows Server 2008 R2)
  3. we now run the new Sharepoint 2010, which has a number of new capabilities

We hope you like the improvements! Please let us know if you have any problems!​

July 20
AGU Fall Meeting 2010 - Arctic Ecohydrology Session
American Geophysical Union Fall Meeting 2010 H10. ECOHYDROLOGY OF ARCTIC AND SUB-ARCTIC ECOSYSTEMS: PATTERNS AND PROCESSES ACROSS SPATIAL AND TEMPORAL SCALES In Arctic and sub-Arctic ecosystems, ecological and hydrological processes are tightly linked, but their interactions are often not well quantified. Also, the impact of permafrost on ecohydrology is not well understood. The ecohydrology of northern ecosystems is changing, with climate warming modifying already highly variable climate, permafrost, and vegetation. Understanding the ecohydrology of these systems is critical for quantifying atmospheric feedbacks and the response of hydrologic process to degrading permafrost terrain. We are interested in abstracts spanning multiple disciplines that explore ecohydrological questions of permafrost-affected terrain at different scales. Sponsor: Hydrology Co-Sponsor: Atmospheric Sciences Biogeosciences Cryosphere Global Environmental Change Conveners: Jessica Cable,, University of Alaska, Fairbanks Torre Jorgenson,, Alaska Ecoscience Anna Liljedahl,, University of Alaska, Fairbanks Jeffrey Welker,, Environment and Natural Resources Institute The abstract submission site is scheduled to open on 21 July. The deadline is 2 September. You may now search and view all accepted sessions on the meeting website:
July 05
Revamped the Dataset Information pages
The dataset information pages have been revised to provide more information about the dataset and the sites.  The information that was previously on the dataset information page is now caontained on 4 separate pages.  The most exciting new page is the published papers list which contains the published paper reference, a link to a information page with the list of FLUXNET sites used and a link to the original proposal.
May 27
Provide copies of published papers to . . .
Authors of papers based on data from are requested to please submit the following: 1. a copy of the final manuscript, 2. bibliographic information for the paper (and whether the paper can be posted openly), 3. any associated appendices, and 4. a list of the site years used in the analysis to All information provided will be made available to authorized users. If allowed by the place where the paper is published, we are also happy to make the paper available publicly.
1 - 10Next