3) ULS (upward looking sonars)

A complete description of the processing used to derive ice drafts from the ULS
data is given in BGOS ULS Data Processing Procedure [PDF]. The output of the
processed ULS data is available in two formats: 1) the complete 2-second ice
draft time series, and 2) daily averages draft statistics, temperature, water
level, and sound speed. With velocities provided from an outside source, the
complete draft time series can be converted to a spatial distribution, and the
features in the ice cover can be clearly discerned and described. If high
resolution is not required, the daily average ice draft (and ancillary) data
provide a synopsis of the results in a convenient abbreviated format.

The complete draft time series are saved in separate ASCII text files for each
mooring and year. The filename includes the deployment year and mooring
identifier (for example uls03a_draft.dat). The first two lines of the file
includes the experiment year, mooring location and data variable names (with
units):

%BG 2003-2004 Mooring A: 75 00.449 N, 149 58.660 W
%date time(UTC) draft(m)

The remainder of the file includes all 15 million (2-second) draft estimates
processed for the full year. Compressed versions of the text file are saved in
.ZIP and TAR.Z formats.

Daily average draft, betas, temperature, and water level information for each
mooring and year are saved in MATLAB format files (e.g. uls03a_daily.mat) with
the following variables:

dates: date string timeseries
name: name of the mooring and dataset
yday: year day timeseries 
BETA: final beta adjustment timeseries used in ice draft calculations
BTBETA: initial beta timeseries based on bottom temperature
ID: number of ice drafts binned daily every 0.1 m from 0.05 to 29.95 m 
IDS: daily ice draft statistics: number, mean, std, minimum, maximum, median
OWBETA: beta timeseries determined from open water events
T: temperature timeseries (°C)
WL: water level timeseries (m)
























3) ULS (upward looking sonars) 

A complete description of the processing used to
derive ice drafts from the ULS data is given in BGOS ULS Data Processing
Procedure [PDF]. The output of the processed ULS data is available in two
formats: 1) the complete 2-second ice draft time series, and 2) daily averages
draft statistics, temperature, water level, and sound speed. With velocities
provided from an outside source, the complete draft time series can be converted
to a spatial distribution, and the features in the ice cover can be clearly
discerned and described. If high resolution is not required, the daily average
ice draft (and ancillary) data provide a synopsis of the results in a convenient
abbreviated format.

The complete draft time series are saved in separate ASCII text files for each
mooring and year. The filename includes the deployment year and mooring
identifier (for example uls03a_draft.dat). The first two lines of the file
includes the experiment year, mooring location and data variable names (with
units):

%BG 2003-2004 Mooring A: 75 00.449 N, 149 58.660 W
%date time(UTC) draft(m)

The remainder of the file includes all 15 million (2-second) draft estimates
processed for the full year. Compressed versions of the text file are saved in
.ZIP and TAR.Z formats.

Daily average draft, betas, temperature, and water level information for each
mooring and year are saved in MATLAB format files (e.g. uls03a_daily.mat) with
the following variables:

dates: date string timeseries
name: name of the mooring and dataset
yday: year day timeseries 
BETA: final beta adjustment timeseries used in ice draft calculations
BTBETA: initial beta timeseries based on bottom temperature
ID: number of ice drafts binned daily every 0.1 m from 0.05 to 29.95 m 
IDS: daily ice draft statistics: number, mean, std, minimum, maximum, median
OWBETA: beta timeseries determined from open water events
T: temperature timeseries (°C)
WL: water level timeseries (m)