These data files are hosted by BIRA-IASB and can be downloaded from the FTP server at
The BASCOE NRT Analyses are written out with a time granularity of 3 hours. Since 2013-01-01 they are archived in NetCDF-3 file format compliant with CF-1.0 conventions. Filenames are of the form: AMLS_VV.vv_yyyymmddHHMM.skkkk.nc
WARNING:
Only the last 45 days of analyses are made available online.
For those who are interested, the entire dataset (i.e. older analyses and/or analyses at
00, 03, 06, 09, 15, 18, 21h UT) can be obtained by request to macc_AT_aeronomie.be.
The files contain the following data and useful attributes:
Data
| Name | Description | Data type | Units |
|---|---|---|---|
| idate | Date in the form yyyymmdd | integer | yyyymmdd |
| ut | Valid Universal Time of day | float | decimal hours |
| longitude | Longitude [0 to 356.25] | float | decimal degrees |
| latitude | Latitude [-90 to 90] | float | decimal degrees |
| level | model level number | integer | decimal degrees |
| ap | ap for hybrid-p vertical grid,see VGRID_DESCRIPTION | float | Pa |
| bp | bp for hybrid-p vertical grid,see VGRID_DESCRIPTION | float | Pa/Pa |
| p0 | Surface Pressure | float | Pa |
| n2o_vmr | N2O gas-phase volume mixing ratio | float | m3/m3 |
| hno3_vmr | HNO3 gas-phase volume mixing ratio | float | m3/m3 |
| h2o_vmr | H2O gas-phase volume mixing ratio | float | m3/m3 |
| clono2_vmr | ClONO2 gas-phase volume mixing ratio | float | m3/m3 |
| hocl_vmr | HOCl gas-phase volume mixing ratio | float | m3/m3 |
| hcl_vmr | HCl gas-phase volume mixing ratio | float | m3/m3 |
| no_vmr | NO gas-phase volume mixing ratio | float | m3/m3 |
| clo_vmr | ClO gas-phase volume mixing ratio | float | m3/m3 |
| no2_vmr | NO2 gas-phase volume mixing ratio | float | m3/m3 |
| o3_vmr | O3 gas-phase volume mixing ratio | float | m3/m3 |
| cl_vmr | Cl gas-phase volume mixing ratio | float | m3/m3 |
Attributes
| Name | Typical value | Explanation |
|---|---|---|
| HGRID_DESCRIPTION | regular lat-lon grid | Human-readable description, including area coverage (currently only global) |
| VGRID_DESCRIPTION | Staggered hybrid-p: p(lon,lat,1:nlev) = 0.5*(ap(1:nlev)+ap(2:nlev+1)) + 0.5*(bp(1:nlev)+bp(2:nlev+1))*p0(lon,lat) | Human-readable description, including staggering status and formula to compute vertical coordinate (i.e. pressure) |
| BASCOE_VERSION | xx.yy.zz | BASCOE version |
| RUNID | AMLS_xx.yy | run ID of the experiment |
Additional Data
For recent streams, the following data may be available:
| Name | Description | Data type | Units |
|---|---|---|---|
| time | Valid Time (mjd2000) | float | days since 2000-01-01 00:00:00 |
| temperature | temperature (from model) | float | Kelvin |
| p_tropop | pressure of highest level in tropopause (from model) | float | Pa |
| p_h2otropo | pressure of highest level for tropo and low strato H2O processing | float | Pa |