Using a ModEx Approach to Incorporate Field Observation to the Development of Thermal Hydrology Models of Permafrost Dynamics

A detailed ModEx approach that cycles between field measurements and model development was used to calibrate and validate a process representation of thermal hydrology at Barrow, Alaska.. Read more...
Schematic of the ModEx Cycle

Figure 1. Schematic of the ModEx cycle surrounding the conceptual model and plots comparing uncalibrated and observed temperature at 40 cm depth from Barrow, Alaska.



Geophysical Estimation of Shallow Permafrost Distribution and Properties in an Ice-wedge Polygon-dominated Arctic Tundra Region

Geophysical imaging and core analysis enable estimates of shallow permafrost properties including ice content, unfrozen water content and salinity, and document correlation between topography and permafrost characteristics. Read more...

Preliminary hydraulic conductivity data

Figure 2.a) Electrical resistivity tomography (ERT) along AB transect; b) estimated permafrost soil unfrozen water content, c) estimated salinity of corresponding thawed soil, d) porosity, e) interpretation of various features including ice-wedge (white, and dash line), very ice-rich soil (orange) or possibly sandy/gravelly non saturated soil (red), layer with high amount of organic matter (green), layer with increasing salinity, decreasing porosity and variable amount of organic matter (light blue), saline layer with limited interstitially segregated ice (dark blue). The petrophysical model characteristics lead to large uncertainties (~30%) in estimated properties and their interpretation in the region between 290 and 500 m, where salinity does not drive resistivity variations. f) CT-scan measured wet bulk density (averaged for each depth) (black line), wet bulk density (black dots), ice-content (red dots), gravimetric organic matter content in dry sample (pink dots), volumetric organic matter content (green dots) and fluid conductivity (red dots) from soil samples, and bulk EC from the ERT (red line) at 136 m (core location) along AB transect.

NGEE Arctic Data Policies and Data Management Guidance

In addition, the data team has prepared a series of guides/help files for use by investigators for reporting, processing, and archiving data for both project and public sharing. We answer the burning questions -- What is a data set? How do I organize my data files for sharing? And more, at


Safety Training Requirements -- New April 9, 2015

NGEE-Arctic participants and collaborators must complete the required viewing of safety videos and reading of safety manuals to be approved for field and laboratory work at NGEE-Arctic facilities in Barrow, Alaska.  The annual review of the manuals has been completed and resulted in only minor changes to the manuals:

  • Both manuals were updated with additional contact information.

Participants and collaborators are strongly encouraged to complete all training requirements prior to travel because computers and internet connectivity are limited in Barrow.

Training materials are only available on the NGEE-Arctic project website (

Access to training materials requires NGEE-Arctic website login. After login, the Safety tab will appear.

  • ORNL participants may access Training Materials with their ORNL UCAMS login UID and PWD.
  • Other participants and collaborators may access Training Materials with their website UID and PWD.
    • If you are not a registered website user, please request an account (Login tab). You will receive e-mail notification with your account information.
    • Note that it may take 24 to 48 hours for your account to be established.

Upon successful completion of the training requirements you will receive e-mail notification from NGEE-Arctic Management that you are approved for field and laboratory work at the NGEE-Arctic facilities in Barrow.