SMOS L2 OS ATBD - ARGANS

Uncertainty
origin
Sea state 4
Sea state 5
Sea state 6
SST front
SSS front
188
Driver D
ICM-CSIC
LOCEAN/SA/CETP
IFREMER
D=1 if
Fg_sc_sea_state_4=T,
0 otherwise
D=1 if
Fg_sc_sea_state_5=T,
0 otherwise
D=1 if
Fg_sc_sea_state_6=T,
0 otherwise
D=0/1 if
Fg_sc_SST_front=F/
T
D=0/1 if
Fg_sc_SSS_front=F/
T
SMOS L2 OS
Algorithm Theoretical
Baseline Document
Contribution Ci
to
Dg_quality_SSS
Init
SCi
value
SC53*D*dS_dT 0 K
SC54*D*dS_dT 0 K
SC55*D*dS_dT 0 K
SC56*D*dS_dT 0 K
SC57*D*dS_dT 0 K
Table 1 – Contributions to the global salinity quality index Dg_quality_SSS
Doc: SO-TN-ARG-GS-0007
Issue: 3 Rev: 9
Date: 25 January 2013
Page: 188
SCi
unit Comments
The global salinity quality index Dg_quality_SSSX is given by the quadratic sum of all
contributions listed in Table 1.
Dg _ quality _ SSSX
i
Ci
2
SCi coefficients values are given in the TGRD and will be updated during the mission.
The SSSX with lowest value for this index will be considered the best one.
A similar global quality index has to be built for the cardioid model case. Until this is not
defined, the descriptor Dg_quality_Acard will be set to 0.
4.14.2.3 Parameters update
In the iterative convergence process several parameters are retrieved depending on the
roughness model used (see section 4.14.1.1.1). In general we will assume that retrieved
parameters are not correlated; thence guessed values at step n can be updated with parameters
retrieved at step n-1.
In case of roughness model 1, retrieved wind components WSx (positive eastward) and WSy
(positive northward) will be used to update wind speed and direction in order to estimate
Tb mod , as:
2
WSn WSx WSy
w = arctan(WSy/WSx)
2