En:parametres en sortie

De WAVEWATCH-III Wiki

Gridded output parameters

Fields of output parameters from WWATCH have been augmented from 29 (version 3.14) to 53 (version 4.05) in order to feed the applications of the IOWAGA project. And there is a further expansion under way, in collaboration with NOAA/NCEP.

As they appear here the variable names are a compromise between different applications. We have added an attribute "globwave_name" in order to give the equivalents used for the globwave project.

You can find model output on the Ifremer IOWAGA ftp site For example, this is a bzipped NetCDF file of the global mean square slopes for the month of January 2005, given by the global multi grid suite, and this directory contains one folder for each field (except for the partition data which are gathered into the “partitions” folder.

This table summarizes all the fields that can be computed by our version of WWATCH. You can follow the links for a detailed description of each variable (to be filled) …

                                        name variable name
old name units
Previmer forecasts hindcasts on ftp
depth
dpt
Depth
m
yes
yes
sea surface height above sea level
wlv
wlv
m
yes
no

significant wave height

hs
hs m
yes
yes
mean wave length
lm
wl
m
yes
no
mean period T0m1 t0m1
t or tm0m1
s
yes
yes
 peak frequency
fp
fp
s-1
yes
yes
peak direction
dp
dp
degree
yes
yes
mean direction (full spectrum) dir
dir degree (from,nautical)
yes
yes
directional spread (full spectrum) spr
spr degree
yes
yes
Parameters inferred from partitions (wind sea, swells #1, #2 …)
Hs for wind sea phs0
hs0 m
yes
yes
Hs for the first swell phs1
hs1 m
yes
yes
Hs for the second swell
phs2
hs2
m
yes
yes
Hs for the third swell
phs3
hs3
m
yes
yes
peak period for wind sea
ptp0
tp0
s
yes
yes
peak period for the first swell
ptp1
tp1
s
yes
yes
peak period for the second swell
ptp2
tp2
s
yes
yes
peak period for the third swell
ptp3
tp3
s
yes
yes
mean direction for wind sea
pdir0
th0 degree
yes
yes
mean direction for first swell
pdir1
th1
degree
yes
yes
mean direction for second swell
pdir2
th2
degree
yes
yes
mean direction for third swell
pdir3
th3
degree
yes
yes
directional spread for wind sea pspr0 si0 degree
no yes
directional spread for first swell pspr1 si1 degree
no yes
directional spread for second swell pspr2 si2 degree
no yes
directional spread for third swell pspr3 si3 degree
no yes
wind sea fraction for wind sea
pws0
ws0
s.d.
yes
no
wind sea fraction for first swell
pws1
ws1
s.d.
yes
no
wind sea fraction for second swell
pws2
ws2
s.d.
yes
no
wind sea fraction for third swell
pws3
ws3
s.d.
yes
no
Useful fields for ocean engineering and marine renewables
wave energy flux cge
CgE kW.m-1
yes
yes

mean period T02

t02
tz s
yes
yes
mean period T01 t01
tm s
yes
yes
Fields for sediment dynamics and wave-current interactions
rms of bottom amplitude displacement abr (uabr/vabr)
abr m
yes
yes
rms of bottom velocity amplitudes ubr (uubr/vubr)
ubr m.s-1
yes
yes
radiation stresses (depth-integrated) sxy
Sxy N.m-1
no
no

waves → ocean momentum flux

two (utwo/vtwo)
two m2.s-2
no
yes
wave-induced Bernoulli head pressure bhd
bh N.m-1
no
no
Stokes transport (depth integrated Stokes drift) tus (utus/vtus)
tus m2.s-1
yes
yes
surface Stokes drift uss (uuss/vuss)
uss m.s-1
yes
yes

surface Stokes drift spectrum

usf
usf m
no
no

Fields for air-sea fluxes and upper ocean mixing

air-side friction velocity ust (uust/vust)
ust m.s-1
yes
yes
wind → waves energy flux faw
faw W.m-2
yes
yes
waves → ocean TKE flux foc
foc W.m-2
yes
yes
waves → ocean stress
two (utwo/vtwo)
two
m2.s-2
yes
yes
wind → waves momentum flux taw (utaw/vtaw)
taw m2.s-2
yes
yes
waves → wind momentum flux
twa (utwa/vtwa)
twa
m2.s-2
yes
yes
Charnock parameter (air) cha
chn s.d.
yes
yes
whitecap coverage
wcc
wcc
s.d.
yes
yes
wind sea fraction
tws
wsf
s.d.
yes
yes
Fields for remote sensing
mean square slopes mss (mssx/mssy)
mss s.d.
yes
yes
Phillips constant msc
msc s.d.
no
yes
Fields for seismic noise
spectra density P2(k) p2s
p2s m4
no
yes
log of spectral density P2(f,k) p2l
p2l m4s
no
yes
Forcing parameters
near-surface current cur (ucur/vcur)
cur (U/V)
m.s-1
yes
yes
wind at 10m
wnd (uwnd/vwnd)
U10/V10
m.s-1
yes
yes
sea ice area fraction ice CI s.d.
yes
yes
power spectral density of equivalent surface pressure fp2s Fp2D m4
no
no
peak period of power spectral density of equivalent surface pressure pp2s p2Tp s-1
no
no


Spectral output parameters

name
variable name
old name
units
previmer forecasts
hindcasts on ftp
lower frequency
frequency1
frequency1
s-1
yes
yes
higher frequency
frequency2
frequency2
s-1
yes
yes
direction
direction
direction
degree
yes
yes
directional variance spectral density
efth
Efth
m2 s rad-1
yes
yes
depth
dpt
depth
m
yes
yes
wind speed
wnd
u10m
m s-1
yes
yes
wind direction
wnddir
udir
degree
yes
yes
current speed
cur
curr
m s-1
yes
yes
current direction
curdir
currdir
degree
yes
yes


Bulk output parameters

name variable name old varname units previmer forecasts hindcasts on ftp
wave variance spectral density
ef
Ef m2 s
yes
no
current speed
cur
curr m s-1
yes
no
current direction
curdir
currdir degree
yes
no
wind speed wnd u10m m s-1 yes no
wind direction wnddir udir degree yes no
depth
dpt
depth m
yes
no
wave mean frequency
f02
f02 s-1
yes
no
wave mean frequency at moment minus 1
f0m1
f0m1 s-1
yes
no
wave peak frequency
fp
fp s-1
yes
no
lower frequency
frequency1
frequency1 s-1
yes
no
higher frequency
frequency2
frequency2 s-1
yes
no
wave significant height
hs
hs m
yes
no
wave mean spreading from ef first freq moment
sth1m
sth1m degree
yes
no
wave mean spreading at ef maximum
sth1p
sth1p degree
yes
no
wave mean spreading
spr
sth1tot degree
yes
no
wave mean spreading from ef second freq moment
sth2m
sth2m
degree
yes
no
wave mean from direction from ef first freq moment
th1m
th1m
degree
yes
no
wave mean from direction at ef maximum
th1p
th1p
degree
yes
no
wave mean from direction
dir
th1tot
degree
yes
no
wave mean direction from ef second freq moment
th2m
th2m
degree
yes
no