October 18, 2013
POLDER 2 - List of Parameters in POLDER "ERB, WV & CLOUDS"
List of Parameters in POLDER "ERB, WV & CLOUDS" level 3 products
The following geophysical parameters are global monthly syntheses computed from all the level 2 products for each superpixel (3x3 pixels).
For details about the calculation of these parameters, see POLDER2 advanced algorithms.
| Parameter | Definition | Unit | Range |
| Ndays | Number of days for which POLDER data are available | - | 0-31 |
| Norb | Number of orbits for which POLDER data are available | - | 0-434 |
| Norb-snow | Number of orbits with no snow/ice risk | - | 0-434 |
| Norb-clear | Number of orbits without cloud | - | 0-434 |
| Norb-cloudy | Number of orbits with clouds | - | 0-434 |
| Norb-TAU | Number of orbits for which cloud optical thickness is calculated | - | 0-434 |
| Norb-Poxy | Number of orbits for which cloud Oxygen pressure is calculated | - | 0-434 |
| Norb-Pray | Number of orbits for which cloud Rayleigh pressure is calculated | - | 0-434 |
| Norb-Phase | Number of orbits for which cloud phase is calculated | - | 0-434 |
| Norb-UH2O | Number of orbits for which total column precipitable water vapor is calculated | - | 0-434 |
| M(µs) | Monthly mean of the cosine of solar zenith angle | - | 0-1 |
| M(Avis) | Monthly mean of the instantaneous albedo at 670 nm over land and 865 nm over ocean | - | 0-1 |
| TD(Avis) | Temporal standard Deviation of the instantaneous albedo at 670/865 nm | - | 0-0.5 |
| M(Avis)clear | Monthly mean of the instantaneous albedo at 670/865 nm when the superpixel is declared clear | - | 0-1 |
| TD(Avis)clear | Temporal standard Deviation of the instantaneous albedo at 670/865 nm when the superpixel is declared clear | - | 0-0.5 |
M(Amodel( c=0)vis) | Monthly mean of the modeled clear-sky albedo at 670/865 nm, that is independent of POLDER measurements and must not be confused with M(Avis)clear | - | 0-1 |
| M(ASW) | Monthly mean of the instantaneous shortwave albedos | - | 0-1 |
| TD(ASW) | Temporal standard Deviation of the instantaneous shortwave albedo | - | 0-0.5 |
| M(ASW)clear | Monthly mean of the instantaneous shortwave albedo when the superpixel is declared clear | - | 0-1 |
| TD(ASW)clear | Temporal standard Deviation of the instantaneous shortwave albedo when the superpixel is declared clear | - | 0-0.5 |
| M(Amodel(c=0)SW) | Monthly mean of the modeled clear-sky shortwave albedo, that is independent of POLDER measurements and must not be confused with M(Avis)SW | - | 0-1 |
| M(Finc) | Monthly average shortwave incident flux density | W m-² | 0-1000 |
| M(Frefl) | Monthly average shortwave reflected flux density; it must not be confused with the mean of the instantaneous fluxes M(Finc) x M(ASW) | W m-² | 0-1000 |
| M(Frefl)clear | Monthly average clear-sky shortwave reflected flux density ; it must not be confused with the mean of the instantaneous fluxes M(Finc) x (ASW)clear nor even less with the mean of the modeled clear-sky flux M(Finc) x M(Amodel(c=0)SW) | W m-² | 0-1000 |
| M(CC) | Monthly mean of the cloud cover | - | 0-1 |
| TD(CC) | Temporal standard Deviation of the cloud cover | - | 0-1 |
M( CC+)M( CC) | Monthly mean of the uncertainty on cloud cover related to re-classification | - - | 0-1 0-1 |
| M(UH2O) | Monthly mean of the total column precipitable water vapor | g cm-² | 0-7.5 |
| TD(UH2O) | Temporal standard Deviation of the total column precipitable water vapor | g cm-² | 0-7.5 |
| M(Poxy) | Monthly mean of the cloud Oxygen pressure | hPa | 0-1200 |
| TD(Poxy) | Temporal standard Deviation of the cloud Oxygen pressure | hPa | 0-1200 |
| M(Pray) | Monthly mean of the cloud Rayleigh pressure | hPa | 0-1200 |
| TD(Pray) | Temporal standard Deviation of the cloud Rayleigh pressure | hPa | 0-1200 |
| M(c) | Monthly mean of the cloud optical thickness at 670 nm over land and 865 nm over ocean | - | 0-500 |
| RTD(c) | Relative Temporal standard Deviation of the cloud optical thickness at 670/865 nm | % | 0-100 |
| M(c)liquid | Monthly mean of the liquid water cloud optical thickness at 670/865 nm | - | 0-500 |
| M(c)ice | Monthly mean of the ice cloud optical thickness at 670/865 nm | - | 0-500 |
| M(c)mixed | Monthly mean of the mixed-phase cloud optical thickness at 670/865 nm | - | 0-500 |
| M(Sc) | Monthly mean of the cloud spherical albedo at 670/865 nm | - | 0-1 |
| TD(Sc) | Temporal standard Deviation of the cloud spherical albedo at 670/865 nm | - | 0-1 |
| FREPHASE | Frequency of occurrence of cloud phase in 4 classes (1: successful phase determination, 2, 3, 4: among successful determinations, relative frequency of liquid, ice and mixed clouds respectively) [%] | % | 0-100 |
| FRECRYSTAL | Frequency of occurrence of ice crystal type (currently not available) | % | 0-100 |
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