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count

name

units

Variable name in CDS

shortName

paramId

an

fc

1

Lake cover

(0 - 1)

lake_cover

cl

26

x

x

2

Lake depth

m

lake_depth

dl

228007

x

x

3

Low vegetation cover

(0 - 1)

low_vegetation_cover

cvl

27

x


4

High vegetation cover

(0 - 1)

high_vegetation_cover

cvh

28

x


5

Type of low vegetation

~

type_of_low_vegetation

tvl

29

x


6

Type of high vegetation

~

type_of_high_vegetation

tvh

30

x


7

Soil type*1

~

soil_type

slt

43

x


8

Standard deviation of filtered subgrid orography

m

standard_deviation_of_filtered_subgrid_orography

sdfor

74

x


9

Geopotential

m**2 s**-2

orography

z

129

x

x

10

Standard deviation of orography

~

standard_deviation_of_orography

sdor

160

x


11

Anisotropy of sub-gridscale orography

~

anisotropy_of_sub_gridscale_orography

isor

161

x


12

Angle of sub-gridscale orography

radians

angle_of_sub_gridscale_orography

anor

162

x


13

Slope of sub-gridscale orography

~

slope_of_sub_gridscale_orography

slor

163

x


14

Land-sea mask

(0 - 1)

land_sea_mask

lsm

172

x

x

*1Soil type (texture) determines the saturation, field capacity and permanent wilting point at all the soil levels, see Table 8.9 in Chapter 8 Surface parametrization, Part IV Physical Processes of the IFS documentation (CY41R2 for ERA5).

...

count

name

units

Variable name in CDS

shortName

paramId

an

fc

1

Significant wave height of first swell partition

m

significant_wave_height_of_first_swell_partition

swh1

140121

x

x

2

Mean wave direction of first swell partition

degrees

mean_wave_direction_of_first_swell_partition

mwd1

140122

x

x

3

Mean wave period of first swell partition

s

mean_wave_period_of_first_swell_partition

mwp1

140123

x

x

4

Significant wave height of second swell partition

m

significant_wave_height_of_second_swell_partition

swh2

140124

x

x

5

Mean wave direction of second swell partition

degrees

mean_wave_period_of_second_swell_partition

mwd2

140125

x

x

6

Mean wave period of second swell partition

s

mean_wave_period_of_second_swell_partition

mwp2

140126

x

x

7

Significant wave height of third swell partition

m

significant_wave_height_of_third_swell_partition

swh3

140127

x

x

8

Mean wave direction of third swell partition

degrees

mean_wave_direction_of_third_swell_partition

mwd3

140128

x

x

9

Mean wave period of third swell partition

s

mean_wave_period_of_third_swell_partition

mwp3

140129

x

x

10

Wave Spectral Skewness

dimensionless

wave_spectral_skewness

wss

140207

x

x

11

Free convective velocity over the oceans

m s**-1

free_convective_velocity_over_the_oceans

wstar

140208

x

x

12

Air density over the oceans

kg m**-3

air_density_over_the_oceans

rhoao

140209

x

x

13

Normalized energy flux into waves

dimensionless

normalized_energy_flux_into_waves

phiaw

140211

x

x

14

Normalized energy flux into ocean

dimensionless

normalized_energy_flux_into_ocean

phioc

140212

x

x

15

Normalized stress into ocean

dimensionless

normalized_stress_into_ocean

tauoc

140214

x

x

16

U-component stokes drift

m s**-1

u_component_stokes_drift

ust

140215

x

x

17

V-component stokes drift

m s**-1

v_component_stokes_drift

vst

140216

x

x

18

Period corresponding to maximum individual wave height

s

period_corresponding_to_maximum_individual_wave_height

tmax

140217

x

x

19

Maximum individual wave height

m

maximum_individual_wave_height

hmax

140218

x

x

20

Model bathymetry

m

model_bathymetry

wmb

140219

x

x

21

Mean wave period based on first moment

s

mean_wave_period_based_on_first_moment

mp1

140220

x

x

22

Mean zero-crossing wave period

s

mean_zero_crossing_wave_period

mp2

140221

x

x

23

Wave spectral directional width

dimensionless

wave_spectral_directional_width

wdw

140222

x

x

24

Mean wave period based on first moment for wind waves

s

mean_wave_period_based_on_first_moment_for_wind_waves

p1ww

140223

x

x

25

Mean wave period based on second moment for wind waves

s

mean_wave_period_based_on_second_moment_for_wind_waves

p2ww

140224

x

x

26

Wave spectral directional width for wind waves

dimensionless

wave_spectral_directional_width_for_wind_waves

dwww

140225

x

x

27

Mean wave period based on first moment for swell

s

mean_wave_period_based_on_first_moment_for_swell

p1ps

140226

x

x

28

Mean wave period based on second moment for swell

s

mean_wave_period_based_on_second_moment_for_wind_waves

p2ps

140227

x

x

29

Wave spectral directional width for swell

dimensionless

wave_spectral_directional_width_for_swell

dwps

140228

x

x

30

Significant height of combined wind waves and swell

m

significant_height_of_combined_wind_waves_and_swell

swh

140229

x

x

31

Mean wave direction

degrees

mean_wave_direction

mwd

140230

x

x

32

Peak wave period

s

peak_wave_period

pp1d

140231

x

x

33

Mean wave period

s

mean_wave_period

mwp

140232

x

x

34

Coefficient of drag with waves

dimensionless

coefficient_of_drag_with_waves

cdww

140233

x

x

35

Significant height of wind waves

m

significant_height_of_wind_waves

shww

140234

x

x

36

Mean direction of wind waves

degrees

mean_direction_of_wind_waves

mdww

140235

x

x

37

Mean period of wind waves

s

mean_period_of_wind_waves

mpww

140236

x

x

38

Significant height of total swell

m

significant_height_of_total_swell

shts

140237

x

x

39

Mean direction of total swell

degrees

mean_direction_of_total_swell

mdts

140238

x

x

40

Mean period of total swell

s

mean_period_of_total_swell

mpts

140239

x

x

41

Mean square slope of waves

dimensionless

mean_square_slope_of_waves

msqs

140244

x

x

42


Expand
title10 metre wind speed

This 10m wind parameter is the wind speed that has been used by the wave model, which is coupled to the atmospheric model.

For this reason:

  •  it is archived on the wave model's native grid, with the same land-sea mask as that model. Therefore, this parameter is not defined over land and wherever else the wave model is not defined, where it is encoded as missing data. Improper decoding of the missing value usually results in very large values being given for these land points.
  • the wave model resets all values below 2 m/s to 2m/s. The reason for this is that as the winds become weak, the long waves (swell) try to drive the wind from below but this is not modelled in the IFS, as it assumes that the wind profile should be logarithmic (+- stability correction). To account for this effect, the whole of the boundary layer scheme would need to be revised. A simple trick to avoid the problem is to boost the weak winds to 2m/s, which is outside the range where the waves can potentially drive the wind.
  • this parameter is actually the 10m neutral wind speed as determined from the atmospheric surface stress (see documentation on Ocean Wave model output parameters). 
  • If wave altimeter data were assimilated, the analysis of this parameter also contains wind speed updates that come directly out of the wave height updates.

This parameter should not be used for looking at the quality of reanalysis surface wind - the u and v components of the 10m wind (atmospheric parameters 165 and 166) should be used instead.


m s**-1

ocean_surface_stress_equivalent_10m_neutral_wind_speed

wind

140245

x

x

43

10 metre wind direction

degrees

ocean_surface_stress_equivalent_10m_neutral_wind_direction

dwi

140249

x

x

44

Wave spectral kurtosis

dimensionless

wave_spectral_kurtosis

wsk

140252

x

x

45

Benjamin-Feir index

dimensionless

benjamin_feir_index

bfi

140253

x

x

46

Wave spectral peakedness

dimensionless

wave_spectral_peakedness

wsp

140254

x

x

47

Altimeter wave height1

m

altimeter_wave_height


awh

140246

x


48

Altimeter corrected wave height1

m

altimeter_corrected_wave_height

acwh

140247

x


49

Altimeter range relative correction1

~

altimeter_range_relative_correction

arrc

140248

x


50

2D wave spectra (single)1,2

m**2 s radian**-1


2dfd

140251

x


...

altimeter_wave_heightaltimeter_corrected_wave_height

count

name

units

Variable name in CDS

shortName

paramId

an

fc

1

UV visible albedo for direct radiation

(0 - 1)

uv_visible_albedo_for_direct_radiation

aluvp

15

x

no mean

2

UV visible albedo for diffuse radiation

(0 - 1)

uv_visible_albedo_for_diffuse_radiation

aluvd

16

x

no mean

3

Near IR albedo for direct radiation

(0 - 1)

near_ir_albedo_for_direct_radiation

alnip

17

x

no mean

4

Near IR albedo for diffuse radiation

(0 - 1)

near_ir_albedo_for_diffuse_radiation

alnid

18

x

no mean

5

Magnitude of turbulent surface stress

N m**-2 s


magss

48


x

6Mean magnitude of turbulent surface stressN m**-2
mmtss235025
x

7

10 metre wind gust since previous post-processing

m s**-1

10m_wind_gust_since_previous_post_processing

10fg

49


no mean

8

Maximum temperature at 2 metres since previous post-processing

K

maximum_2m_temperature_since_previous_post_processing

mx2t

201


no mean

9

Minimum temperature at 2 metres since previous post-processing

K

minimum_2m_temperature_since_previous_post_processing

mn2t

202


no mean

10

10 metre wind speed

m s**-1


10si

207

x

x

11

Maximum total precipitation rate since previous post-processing

kg m**-2 s**-1

maximum_total_precipitation_rate_since_previous_post_processing

mxtpr

228226


no mean

12

Minimum total precipitation rate since previous post-processing

kg m**-2 s**-1

minimum_total_precipitation_rate_since_previous_post_processing

mntpr

228227


no mean

13

Altimeter wave height

m


awh

140246

no mean


14

Altimeter corrected wave height

m


acwh

140247

no mean


15

Altimeter range relative correction

~

altimeter_range_relative_correction

arrc

140248

no mean


16

2D wave spectra (single)

m**2 s radian**-1


2dfd

140251

no mean


...

count

name

units

shortName

paramId

an

fc

1

Specific rain water content

kg kg**-1

crwc

75

x

x

2

Specific snow water content

kg kg**-1

cswc

76

x

x

3

Eta-coordinate vertical velocity

s**-1

etadot

77

x

x

4

Geopotential*1

m**2 s**-2

z

129

x

x

5

Temperature

K

t

130

x

x

6

U component of wind

m s**-1

u

131

x

x

7

V component of wind

m s**-1

v

132

x

x

8

Specific humidity

kg kg**-1

q

133

x

x

9

Vertical velocity

Pa s**-1

w

135

x

x

10

Vorticity (relative)

s**-1

vo

138

x

x

11

Logarithm of surface pressure*1

~

lnsp

152

x

x

12

Divergence

s**-1

d

155

x

x

13

Ozone mass mixing ratio

kg kg**-1

o3

203

x

x

14

Specific cloud liquid water content

kg kg**-1

clwc

246

x

x

15

Specific cloud ice water content

kg kg**-1

ciwc

247

x

x

16

Fraction of cloud cover

(0 - 1)

cc

248

x

x

*1Only archived on level=1.

...