Collaborative Research:  Changing Seasonality of the Arctic: Alteration of Production Cycles and Trophic Linkages in Response to Changes in Sea Ice and Upper Ocean Physics
Funded by NSF Office of Polar Programs
Jinlun Zhang and Mike Steele (University of Washington)
Yvette H. Spitz (Oregon State University)
Carin J. Ashjian (Woods Hole Oceanographic Institution)
Robert G. Campbell (University of Rhode Island)



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BIOMAS Data (under construction):

The BIOMAS Data and some supporting programs can be grabbed here. Some sea ice thickness and biology fields are illustrated by movies.

Variables:


Variable
Variable name
Dimension
Unit

File name
Nanophytoplankton at 2.5 m
Sphy1
2-D mmol N/m3

Sphy1.H<yyyy>
Diatoms at 2.5 m
Lphy1
2-D mmol N/m3

Lphy1.H<yyyy>
Microzooplankton at 2.5 m
Szoo1
2-D mmol N/m3

Szoo1.H<yyyy>
Copepods at 2.5 m
Lzoo1
2-D mmol N/m3

Lzoo1.H<yyyy>
Predator zooplankton at 2.5 m
Pzoo1
2-D mmol N/m3

Pzoo1.H<yyyy>
Nitrate at 2.5 m
nitrate1
2-D mmol N/m3

nitrate1.H<yyyy>
Ammonium at 2.5 m
ammonium1
2-D mmol N/m3

ammonium1.H<yyyy>
Particulate organic nitrogen at 2.5 m
pon1
2-D mmol N/m3

pon1.H<yyyy>
Dissolved organic nitrogen at 2.5 m
don1
2-D mmol N/m3

don1.H<yyyy>
Silicate at 2.5 m
silicate1
2-D mmol Si/m3

silicate1.H<yyyy>
Particulate organic silica at 2.5 m
pos1
2-D mmol Si/m3

pos1.H<yyyy>
Chlorophyll-a at 2.5 m
chla1
2-D mg/m3

chla1.H<yyyy>
Primary productivity integrated over 100 m
pp_VI
2-D mgC/m2/day

pp_VI.H<yyyy>






Methods and data:

These are monthly mean fields of biology and nutrients. Sea ice and ocean data are provided here.

Grid:

Grid Parameters:
Grid configuration
Generalized curvilinear coordinate system
Grid Size:  360 x 88
Spatial Coverage
Arctic. The grid domain is shown here
lon and lat for scalar fields
grid.dat
lon and lat for vector fields
grid.dat.pop
angle between latitude line and  grid cell x-coordinate line alpha.fortran.dat

Temporal Coverage:

Currently monthly data  from 1/1988 to 12/2007. Each file contains 12 monthly 2-D fields.

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 such as diatoms
read_draw_hi.pro : IDL program to read and plot sea ice thickness, can be used to read other scalar fields such as diatoms
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
kmt_360_88_output: model grid mask; ocean levels > 0, land = 0

Other Ways for Data Access:

You can access the data via FTP by entering 'ftp psc.apl.washington.edu', then 'anonymous' as your log name, and your email address as password. After entering the web site, go to zhang/BIOMAS.
You can also access the data from here:  ftp://pscftp.apl.washington.edu/zhang/BIOMAS
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 one or both of the following papers 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.
Zhang, J., Y.H. Spitz, M. Steele, C. Ashjian, R. Campbell, L. Berline, and P. Matrai, Modeling the impact of declining sea ice on the Arctic marine planktonic ecosystem, J. Geophy. Res., in press, 2010.


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