Integrated Surface Flux System

ISFS Description

The Integrated Surface Flux System (ISFS) is designed to study exchange processes between the atmosphere and Earth's surface.

ISFS combines the capabilities of a network of surface weather stations with the ability to support intensive micrometeorological research at a single site. Investigators can configure ISFS resources to match the research objectives of each field project.

In the network mode, multiple sites can be instrumented to measure near-surface wind, temperature, humidity, pressure and precipitation. As needed, scientists can also request measurements of momentum fluxes, sensible and latent heat fluxes, short-wave and long-wave radiation, soil temperature, soil moisture and soil heat flux at each station.

In an intensive mode, multiple sensors can be deployed on an array of towers at a single site for detailed examination of the turbulence structure of the atmospheric surface layer. ISFS also supports the addition of user-supplied sensors with digital or analog outputs at data rates up to 10,000 samples/s.

ISFS integrates data from both network and intensive modes with a common data ingest, archival and display system. Solar power, RF modems and satellite data transmission provide sighting flexibility to permit ISFS to operate almost anywhere.

The ISFS is managed by EOL/ISF.

 

Data Products

Average statistics of all variables, including the second-order moments needed to compute fluxes, are a standard product of ISFS and are available in real-time for display. When possible, every data sample is archived to allow processing using spectral, wavelet, or conditional sampling methods. ISFS also supports the addition of user-supplied sensors with digital or analog outputs at data rates up to 10,000 samples/s.

 

Project Archives

ISFS Project Documentation is available online for most projects. For each project listed there is a link to the project report, table of variables, field logbook, data links, and a contact person.

The project reports contain a description of the field site, instrumentation configuration, and data processing steps. For some projects, there are also plots of weather conditions, fluxes, etc.

The field logbook has all information logged by ISF staff and visitors before, during, and after the field campaign. Each entry is indexed by time, location, type (e.g. sensor), and author.

Data available online include 5-minute average statistics (through 4th-order moments for turbulence variables) of all quantities measured. For some projects, "raw" time series of every sample from each sensor also are available. These are processed using the calibrations that are current at the time of download -- users are encouraged to check with SSSF for the status of these calibrations.
 

What's New

CentNet

In response to user demand for expanded spatial coverage and measurement types, we have developed a strategy for deploying 100 systems and currently are seeking funding for construction.  

Read more about CentNet.

 

Sensors

Standard ISFS sensors are available for the following measurements: momentum, sensible heat, and water vapor fluxes by eddy-correlation; vertical profiles of wind, temperature, and humidity; radiation fluxes; and soil temperature, soil moisture, and soil heat fluxes. The ISFS sensors are a mix of commercial instruments and in-house developments. Whenever possible, each sensor has a microprocessor that provides sensor output in calibrated engineering units through a serial communications link.

User-supplied or non-standard sensors can be readily accommodated by ISFS. Power and mounting are provided and the various data streams are easily integrated into the system.

See the Sensor List for a table of supported sensors.

 

Variable Names

Since many different variables can be measured at multiple sites, a naming convention, ISFS Variable Names, has been established to manage the profusion of variable names.

 

PI Interaction

We encourage our users to be involved with all aspects of the field measurements. To this end, we have a User Guide to describe all of the aspects of our field deployments.

 

TRAM

The TRAnsect Measurement (TRAM) system is a tool to investigate a variety of problems in which repetitive measurements of spatial gradients are required on scales of 1 - 200 m (primarily horizontal). Operating similar to an electric train, TRAM consists of one or more instrumented trolleys that traverse a fixed cable supported by a set of many towers.

Read more about TRAM.