 |
Antarctic
and
Arctic
Sea
Ice
Thickness, Concentration, Growth, and Melt Data
|
| - From GIOMAS
(Global Ice-Ocean Modeling
and Assimilation System) |
|
|
Polar
Science Center
|
|
|
GIOMAS Data:
The GIOMAS Data and some
supporting
programs can be grabbed here. The
global
sea ice thickness fields are
illustrated by movies.
Variables:
* Ice growth
rate is the net ice production due to atmospheric heating/cooling
and
oceanic heat flux.
** When converted to W/m*m by multiplying a negative value of
(-3.02*10**8), this variable becomes ocean heat flux to the mixed
layer
and can be used to drive global sea ice models.
*** To convert to
actual snow depth, multiply a factor of (water density/snow
density).
Methods
and
data:
SSM/I ice
concentration data were assimilated in the TED sea ice model
that
is used in GIOMAS.
Grid:
Grid
Parameters:
Temporal
Coverage:
Currently
monthly data from 1/1979 to 12/2009. Each file contains
12 monthly 2-D fields. For sea ice and ocean velocities, first
comes
2-D u component followed by v component.
Data
Format:
The
data
are flat binary files (no
headers) consisting of single-precision floating-point numbers.
The data were written as unformatted direct
access files on a Linux PC cluster. Byte order may
have to be changed if you are using a machine
using a different byte order (e.g. HP workstations ). A FORTRAN
program
demonstrating how to read sea ice thickness and grid
information is provided (read_hi_uice.f).
An
IDL
program
demonstrating how to read (and plot) scalar fields and grid
information
is also
provided (read_draw_hi.pro).
Another
IDL
routine (read_draw_uice.pro)
is
provided to read vector fields and vector grid information.
It
also plots ice velocity on a spherical coordinate system using the
angle between the latitude line
and the grid cell x-coordinate line (alpha.fortran.dat).
The
structure
of the data sets should
be apparent from these routines. Please let us know if you
have
difficulty reading the data.
Utilities:
read_hi_uice.f
: FORTRAN program to read sea ice thickness and grid
information, can be used to read other scalar fields
read_draw_hi.pro
: IDL program to read and plot sea ice thickness, can be used to
read
other scalar fields such as ice concentration and ice growth
read_draw_uice.pro
: IDL program to read and plot sea ice velocity, can be used to read
and plot other vector fields such as ocean velocity
colorbar.pro:
IDL routine for drawing color bar
con_clr.pro:
IDL routine for setting colors
LLtoXY.pro:
IDL routine for plotting vectors
LLtoXY_s.pro:
IDL routine for plotting vectors
XYtoLL.pro:
IDL routine for plotting vectors
XYtoLL_s.pro:
IDL routine for plotting vectors
heads.pro:
IDL routine for plotting vectors
io.dat_360_276.output:
model grid mask; ocean levels > 0, land = 0
Other
Ways
for Data Access:
You can access
the
data via SFTP by entering 'sftp anonymous@pscfiles.apl.uw.edu',
then 'anonymous' as your password. After entering the web site, go
to /pscfiles/zhang/Global_seaice.
You can also access the data from here: https://pscfiles.apl.uw.edu/zhang/Global_seaice
If you are downloading the data, please e-mail us at zhang@apl.washington.edu
we
can update you on changes, bugs etc.
Other
Related (Arctic Sea Ice-Ocean) Data Sets:
Attribution:
We'd
appreciate
your reference to the following paper for using the
data:
Zhang, Jinlun
and D.A. Rothrock: Modeling
global sea ice with a
thickness and enthalpy distribution model in generalized
curvilinear
coordinates,
Mon. Wea. Rev. 131(5), 681-697, 2003.
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