...
| Warning |
|---|
The following MARS retrieval is provided only as an example of the sort of change that users will need to make once the data are provided in GRIB2. There is no need to re-specify the param keyword in the second and third retrieve blocks as it will be inherited from the first retrieve block. It is included here only to illustrate the changes needed. |
| Retrieval of maximum and minimum 2m temperature in GRIB1 | Retrieval of maximum and minimum 2m temperature in GRIB2 |
|---|
| HTML |
|---|
<pre>
retrieve,
class=od,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
levtype=sfc,
<b><font color="red">param=201/202</font></b>, <b><font color="red"># mx2t/mn2t</font></b>
step=1/2/3/4/5/6,
target="output_max_min_2t_1h.grib1"
retrieve,
<b><font color="red">param=228026/228027</font></b>, <b><font color="red"># mx2t3/mn2t3</font></b>
step=3/6,
target="output_max_min_2t_3h.grib1"
retrieve,
<b><font color="red">param=121/122</font></b>, <b><font color="red"># mx2t6/mn2t6</font></b>
step=6,
target="output_max_min_2t_6h.grib1"
<pre> |
|
| HTML |
|---|
<pre>
retrieve,
class=od,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
levtype=sfc,
<b><font color="red">param=237167/238167</font></b>, <b><font color="red"># max_2t/min_2t</font></b>
<b><font color="red">timespan=1h</font></b>, <b><font color="red"># previous hour</font></b>
step=1/2/3/4/5/6,
target="output_max_min_2t_1h_3h.grib2"
retrieve,
<b><font color="red">param=237167/238167</font></b>, <b><font color="red"># max_2t/min_2t</font></b>
<b><font color="red">timespan=3h</font></b>, <b><font color="red"># previous 3 hours</font></b>
step=3/6,
target="output_max_min_2t.grib2"
retrieve,
<b><font color="red">param=237167/238167</font></b>, <b><font color="red"># max_2t/min_2t</font></b>
<b><font color="red">timespan=6h</font></b>, <b><font color="red"># previous 6 hours</font></b>
step=6,
target="output_max_min_2t.grib2"
<pre> |
|
...
target="output_max_min_2t_6h.grib2"
<pre> |
|
The timespan keyword is also needed for parameters accumulated from the start of the forecast, such as precipitation or and radiation parameters . For such parameters, set timespan=fs for "from startaccumulated from start of forecast", e.g:
| Warning |
|---|
The following MARS retrieval is provided only as an example of the sort of change that users will need to make once the data are provided in GRIB2. |
| Retrieval of maximum and minimum 2m temperature in GRIB1 | Retrieval of maximum and minimum 2m temperature in GRIB2 |
|---|
| HTML |
|---|
<pre>
retrieve,
class=od,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
levtype=sfc,
param=169, # ssrd - surface solar radiation downwards
step=6/to/360/by/6,
target="output_ssrd.grib1"
<pre> |
|
| HTML |
|---|
<pre>
retrieve,
class=od,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
levtype=sfc,
param=169, # ssrd - surface solar radiation downwards
<b><font color="red">timespan=fc</font></b>, <b><font color="red"># from start of forecast</font></b>
step=6/to/360/by/6,
target="output_ssrd.grib2"
<pre> |
|
Addition of new MARS keyword chem for retrieval of chemical species
...
| Retrieval of NO2 mass-mixing ratio in GRIB2 - current | Retrieval of NO2 mass-mixing ratio in GRIB2 - new |
|---|
| HTML |
|---|
<pre>
retrieve,
class=mc,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
step=0,
levtype=ml,
levelist=1/to/137,
<b><font color="red">param=210121</font></b>,
target="output_no2.grib1"
<pre> |
|
| HTML |
|---|
<pre>
retrieve,
class=mc,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
step=0,
levtype=ml,
levelist=1/to/137,
<b><font color="red">param=402000</font></b>, <b><font color="red"># Mass mixing ratio</font></b>
<b><font color="red">chem=no2<17</font></b>, <b><font color="red"># Nitrogen dioxide</font></b>
target="output_no2.grib2"
<pre> |
|
...
| Warning |
|---|
The following MARS retrieval is provided only as an example of the sort of change that users will need to make once the data are provided in GRIB2. The values taken by the chem keyword are not yet finalised.
|
| Retrieval of sea salt aerosol optical depth at 550nm in GRIB1 | Retrieval of sea salt aerosol optical depth at 550nm in GRIB2 |
|---|
| HTML |
|---|
<pre>
retrieve,
class=mc,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
step=0,
levtype=sfc,
<b><font color="red">param=208.210</font></b>,
target="output_sea_salt_aerosol_550.grib1"
<pre> |
|
| HTML |
|---|
<pre>
retrieve,
class=mc,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
step=0,
levtype=ml,
levelist=1/to/137,
<b><font color="red">param= |
|
<457000</font></b>, <b><font color="red"># Aerosol optical depth</font></b>
<b><font color="red">chem= |
|
no2<936</font></b>, <b><font color="red"># Sea salt |
|
salt<aerosol</font></b>
<b><font color="red">wavelength= |
|
<550</font></b>, <b><font color="red"># At 550nm
target="output_sea_salt_aerosol_550.grib2"
<pre> |
|
Change of GRIB packing for GRIB2 parameters retrieved from MARS on a grid
...
| Retrieval of NO2 mass-mixing ratio in GRIB2 - current | Retrieval of NO2 mass-mixing ratio in GRIB2 - new with simple packing |
|---|
| HTML |
|---|
<pre>
retrieve,
class=mc,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
step=0,
levtype=ml,
levelist=1/to/137,
<font color="red">param=210121</font>,
target="output_no2.grib1grib2"
<pre> |
|
| HTML |
|---|
<pre>
retrieve,
class=mc,
stream=oper,
expver=1,
date=-2,
time=00:00:00,
type=fc,
step=0,
levtype=ml,
levelist=1/to/137,
<font color="red">param=402000</font>, <<font<font color="red"># Mass mixing ratio</font>
<font color="red">chem=no2<17</font>, <font color="red"># Nitrogen dioxide</font>
<b><font color="red">packing=simple</font></b>, <b><font color="red"># Simple packing</font></b>
target="output_no2.grib2"
<pre> |
|
