Subnivean Level 1 Data Retrieval

Level 1 data is 10-minute data that has been converted, calibrated, and filtered. Data conversions are performed to change mV instrument outputs to proper units. Relative calibrations are performed on the aerodynamic profile data to ensure that each instrument produces the same value when all the instruments are placed on one level. Data filtering replaces data exceeding arbitrary constraints with missing value indicators.

NOTE: If you select "All Avaiable Data", all metadata pertaining to the time period you select will be appended to the beginning of the data file. This includes all comments and ancillary information for that period, even for the instruments that are not selected.

Period for Data Acquisition

Specify the beginning and ending dates (year and month) for which you would like to receive data. The data record will begin at 0000 hours on the beginning date and end with the last observation on the ending date (i.e. 2350 for 10-minute data, 2300 for hourly data). Daily data records will be inclusive of the dates you specify.
Available Data from 9608 to 0812
Beginning Date (e.g. 9608) Ending Date (e.g. 9609)

SUBNIVEAN DATA

Check the appropriate boxes below to specify the particular data you wish to recieve. At the end of the form, send your request by pushing the send button, or you may clear the form and start over. If you simply want to receive all available data for the time period you've specified, check the boxes immediately following and send you request from here.

SEND ME ALL AVAILABLE 10-MINUTE DATA

Radiometric Data

ALL RADIOMETER DATA

Incident Shortwave
Reflected Shortwave
Atmospheric Longwave
Terrestrial Longwave
Net Radiation
Global Shortwave (Direct + Diffuse)
Diffuse Shortwave

Aerodynamic Profile Data

ALL AERODYNAMIC PROFILE DATA

BAROMETRIC PRESSURE
ALL AIR TEMPERATURE DATA
- Air Temperature, Level 1
- Air Temperature, Level 2
- Air Temperature, Level 3
- Air Temperature, Level 4
ALL RELATIVE HUMIDITY DATA
- Relative Humidity, Level 1
- Relative Humidity, Level 2
- Relative Humidity, Level 3
- Relative Humidity, Level 4
ALL WIND SPEED DATA
- Wind Speed, Level 1
- Wind Speed, Level 2
- Wind Speed, Level 3
- Wind Speed, Level 4
ALL WIND DIRECTION DATA
- Wind Direction, Level 3
- Wind Direction, Level 4

Ancillary Snow Data

ALL ANCILLARY SNOW DATA

Tower Snow Depths
Local Snowpit Structure Data
Local Snowpit Chemistry Data
General Snowpack Comments

Lysimeter Data

ALL LYSIMETER DATA

Paired 1 m^2 lysimeters (2)
0.2 m^2 lysimeter array (16)
Not currently available Misc. lysimeter water chemistry

Additional Metadata

Miscellaneous Comments (weather observation, photograph information, etc.)

First Analysis of data

Instrument Calibration

Calibration periods for aerodynamic instruments, instrument problems, and datalogger program/wiring changes.

Computed Values

ALL TURBULENT FLUX QUANTITIES

Sensible Heat Flux
Latent Heat Flux
Richardson Number
Saturation Vapor Pressure
Vapor Pressure

Simple Albedo

Direct Beam Radiation

Net Radiation (sum of four individual components)

or .

Return to Niwot Ridge Subnivean Data Retrieval System Home Page

If any problems arise please e-mail
Todd Ackerman (todda@culter.colorado.edu)