Recent grib files

Rcfile settings

ecm.set	description
latest	recent od files
od-month	recent od files, monthly
od-mix	new surface files RS0 and RS1, other files have old format

File name convention

Examples of file names based on the storage in MARS:

od/fc/0000/00/sfc/N80/LSM.gb
od/fc/2002/06/ml1/T159/LNSP_20020618_00p06.gb
od/fc/2002/06/ml1/T159/LNSP_20020618_03p06.gb
od/fc/2002/06/ml60/T159/VOD_20020618_00p06.gb
od/fc/2002/06/ml60/T159/VOD_20020618f05_00p06.gb
od/4v/2002/06/ml60/N80/Q_20020618_03p03.gb

General name:

<class>/<type>/<year>/<month>/<levtype>[<nlev>]/<grid>/<filekey>_<year><month><day>[<fcday>]_<times>.gb

<class>

Data class:

• od : operational data
• e4 : 40 year reanalysis

<type>

Data type:

• fc : forecast
• fg : first guess
• an : analysis
• 4v : 4D var analysis

<levtype>[<nlev>]

Level type:

• sfc : surface
• ml : model levels; some 2D fields are only available as model level, for example LNSP

The number of levels is included for level types other than 'sfc'.

<grid>

key for horizontal resolution

• 360_180 : gridded 1x1 (OLD)
• T159 : spherical harmonics, truncation 159
• N80 : gaussian grid, 80 latitudes, reduced to poles
  Only the 'default' ECMWF resolutions are available; see the Gaussian grids page.
• N80reg : gaussian grid, 80 latitudes, regular
  Regular resolutions were sometimes required in former days, when grids that were archived in MARS at a high resolution (say N512) could only be extracted at lower resolution (say N80) on a regular grid. OD data in 2001 was for example extracted as N80reg; ERA40 is saved as N80, and has always been extracted in the reduced N80 form.

<filekey>

gives an idea of the parameters storred in the file; see table.

<fcday>

optional forecast day with format 'f<ndays>';
for example '20020618f05' denotes a 5 days forecast valid for 18-06-2002.

<times>

time resolution key:

• 00p03 : first field valid for hour 00:00, increments of 03 hour

A simple convention to have a file name containing a complete description of the contents is to replace all '/' in the full path with '-' :

od-4v-2002-06-ml60-N80-Q_20020618_03p03.gb

To achieve this in csh, use for example the sed command:

set fullpath = od/4v/2002/06/ml60/N80/Q_20020618_03p03.gb
set longname = `echo $fullpath | sed -e 's^/^-^g'`

and for the reverse:

set longname = od-4v-2002-06-ml60-N80-Q_20020618_03p03.gb
set fullpath = `echo $longname | sed -e 's^-^/^g'`

Contents

fkey	old fkey$^0$	param	description	unit	ac	levels	repres	grib	od-an	od-fc	e4-an	e4-fc	remark
LNSP	RHL,RHL2	LNSP	log normal surface pressure	ln(Pa)		ml1	sh	152		x		x
VOD	RHD	VO	vorticity	1/s		ml<n>	sh	138		x		x
		D	divergence	1/s		ml<n>	sh	155		x		x
W	RHW	W	vertical velocity	Pa/s		ml<n>	sh	135		x		x
T	RHT	T	temperature	K		ml<n>	sh	130		x		x
Q	RGQ	Q	Specific humidity	kg/kg		ml<n>	gg	133		x		x
CLD	RGC	CLWC	cloud liquid water content	kg/kg		ml<n>	gg	246		x		x
		CIWC	cloud ice water content	kg/kg		ml<n>	gg	247		x		x
		CC	cloud cover	0-1		ml<n>	gg	248		x		x
-	RGF	mu	Updraught mass flux	kg/m2	ac	ml<n>	gg	104				x
		md	Downdraught mass flux	kg/m2	ac	ml<n>	gg	105				x
		du	Updraught detrainment rate	s/m	ac	ml<n>	gg	106				x
		dd	Downdraught detrainment rate	s/m	ac	ml<n>	gg	107				x
-	RGK	K	Turbulent diffusion coefficient for heat	m2	?	?	?	109				x
-	RGP	PRECIP	Total precipitation profile	kg/m2	?	?	?	108				x
-	RSC	TCC	total cloud cover	0-1	?	?	?	164				x
		HCC	high cloud cover	0-1	?	?	?	188				x
		MCC	medium cloud cover	0-1	?	?	?	187				x
		LCC	low cloud cover	0-1	?	?	?	186				x
		TCWV	total column water vapour	kg/m2	?	?	?	137				x
S0	RSA	CVL	Low vegetation cover	0-1		sfc	gg	027	x		x
		CVH	High vegetation cover	0-1		sfc	gg	028	x		x
		TVL	Type of low vegetation	Table index		sfc	gg	029	x		x
		TVH	Type of high vegetation	Table index		sfc	gg	030	x		x
		SR	Surface Roughness	m		sfc	gg	173	x		x
		AL	Albedo	(0-1)		sfc	gg	174	x		x
		LSRH	Log. Surf.Roughn. length for Heat	-		sfc	gg	234	x		x
	RS0, RSGA	CVL	Low vegetation cover	0-1		sfc	gg	027	x		x
		CVH	High vegetation cover	0-1		sfc	gg	028	x		x
		TVL	Type of low vegetation	Table index		sfc	gg	029	x		x
		TVH	Type of high vegetation	Table index		sfc	gg	030	x		x
-	RSG0	SR	Surface roughness	m		sfc	gg	173	x		x
		AL	Albedo	(0-1)		sfc	gg	174	x		x
		LSRH	Log. surface roughn. for heat			sfc	gg	234	x		x
S1	-	CI	Sea-ice cover	0-1		sfc	gg	031	x	x	x	x
		SWVL1	volumetric soil water layer 1	m3/m3		sfc	gg	039	x	x	x	x	1)
		SWVL2	volumetric soil water layer 2	m3/m3		sfc	gg	040	x	x	x	x	1)
		SWVL3	volumetric soil water layer 3	m3/m3		sfc	gg	041	x	x	x	x	1)
		SWVL4	volumetric soil water layer 4	m3/m3		sfc	gg	042	x	x	x	x	1)
		10FG	Wind gust at 10 metres	m/s		sfc	gg	049		x		x	2)
		SD	Snow depth	m of water eqv		sfc	gg	141	x	x	x	x
		LSP	Stratiform precipation	m	ac	sfc	gg	142		x		x
		CP	Convective precipation	m	ac	sfc	gg	143		x		x
		SF	Snowfall (convective+stratiform)	m of water eqv	ac	sfc	gg	144		x		x
		SSHF	Surface sensible heat flux	W/m2 s	ac	sfc	gg	146		x		x
		SLHF	Surface latent heat flux	W/m2 s	ac	sfc	gg	147		x		x
		BLH	Boundary layer height	m		sfc	gg	159		x		x
		10U	10 metre u wind	m/s		sfc	gg	165	x	x	x	x
		10V	10 metre v wind	m/s		sfc	gg	166	x	x	x	x
		2T	2 metre temperature	K		sfc	gg	167	x	x	x	x
		2D	2 metre dewpoint temperature	K		sfc	gg	168	x	x	x	x
		SSR	Surface solar radiation	W/m2 s	ac	sfc	gg	176		x		x
		EWSS	East/West surface stress	N/m2 s	ac	sfc	gg	180		x		x
		NSSS	North/Sourth surface stress	N/m2 s	ac	sfc	gg	181		x		x
		SRC	Skin reservoir content	m of water		sfc	gg	198	x	x	x	x
	RS1	CI	Sea-ice cover	0-1		sfc	gg	031	x	x	x	x
		SWVL1	volumetric soil water layer 1	m3/m3		sfc	gg	039	x	x	x	x	1)
		SWVL2	volumetric soil water layer 2	m3/m3		sfc	gg	040	x	x	x	x	1)
		SWVL3	volumetric soil water layer 3	m3/m3		sfc	gg	041	x	x	x	x	1)
		SWVL4	volumetric soil water layer 4	m3/m3		sfc	gg	042	x	x	x	x	1)
		10FG	Wind gust at 10 metres	m/s		sfc	gg	049		x		x	2)
		BLH	Boundary layer height	m		sfc	gg	159		x		x
		10U	10 metre u wind	m/s		sfc	gg	165	x	x	x	x
		10V	10 metre v wind	m/s		sfc	gg	166	x	x	x	x
-	RSGB,RSGB2	CI	Sea-ice cover	0-1		sfc	gg	031	x	x	x	x
		SWVL1	volumetric soil water layer 1	m3/m3		sfc	gg	039	x	x	x	x	1)
		SWVL2	volumetric soil water layer 2	m3/m3		sfc	gg	040	x	x	x	x	1)
		SWVL3	volumetric soil water layer 3	m3/m3		sfc	gg	041	x	x	x	x	1)
		SWVL4	volumetric soil water layer 4	m3/m3		sfc	gg	042	x	x	x	x	1)
		10FG	Wind gust at 10 metres	m/s		sfc	gg	049		x		x	2)
		BLH	Boundary layer height	m		sfc	gg	159		x		x
		10U	10 metre u wind	m/s		sfc	gg	165	x	x	x	x
		10V	10 metre v wind	m/s		sfc	gg	166	x	x	x	x
		CHNK	Charnock (surf. stress)	-		sfc	gg	148	?	?	?	?
-	RSG,RSG2	SSHF	Surface sensible heat flux	W/m2 s	ac	sfc	gg	146		x		x
		SLHF	Surface latent heat flux	W/m2 s	ac	sfc	gg	147		x		x
		EWSS	East/West surface stress	N/m2 s	ac	sfc	gg	180		x		x
		NSSS	North/Sourth surface stress	N/m2 s	ac	sfc	gg	181		x		x
		LSP	Stratiform precipation	m	ac	sfc	gg	142		x		x
		CP	Convective precipation	m	ac	sfc	gg	143		x		x
		SF	Snowfall (convective+stratiform)	m of water eq	ac	sfc	gg	144		x		x
		SD	Snow depth	m of water eq		sfc	gg	141		x		x
		SWL3	Soil wetness level 3	m of water		sfc	gg	184
		2T	2 metre temperature	K		sfc	gg	167		x		x
		2D	2 metre dewpoint temperature	K		sfc	gg	168		x		x
		SSR	Surface solar radiation	W/m2 s	ac	sfc	gg	176		x		x
		SRC	Skin reservoir content	m of water		sfc	gg	198		x		x
Z	RGZ	Z	geopotential lev 1 (orography)	m2/s2		sfc	gg	129		x		x
LSM	RGM	LSM	land sea mask	0-1		sfc	gg	172		x		x

0)

File key for old grib files, see below.

1)

Abbrevitions 'SWVL1/SWVL2/SWVL3/SWVL4' are not recoqnized by MARS; use '39/40/41/42' instead.

2)

Fields valid for time intervals [0,3] , [3,6] , ...