FN Archimer Export Format
PT J
TI Assessing the impact of multiple altimeter missions and Argo in a global eddy-permitting data assimilation system
BT 
AF VERRIER, Simon
   LE TRAON, Pierre-Yves
   REMY, Elisabeth
AS 1:1,2;2:1,2;3:1;
FF 1:PDG-ODE-LOPS-SIAM;2:PDG-ODE-ADM3;3:;
C1 Mercator Ocean, F-31520 Ramonville St Agne, France.
   IFREMER, F-29280 Plouzane, France.
C2 MERCATOR OCEAN, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-LOPS-SIAM
   PDG-ODE-ADM3
UM LOPS
IN WOS Ifremer jusqu'en 2018
   DOAJ
   copubli-france
IF 2.289
TC 12
UR https://archimer.ifremer.fr/doc/00416/52780/53660.pdf
LA English
DT Article
AB A series of observing system simulation experiments (OSSEs) is carried out with a global data assimilation system at 1∕4° resolution using simulated data derived from a 1∕12° resolution free-run simulation. The objective is to not only quantify how well multiple altimeter missions and Argo profiling floats can constrain the global ocean analysis and 7-day forecast at 1∕4° resolution but also to better understand the sensitivity of results to data assimilation techniques used in Mercator Ocean operational systems. The impact of multiple altimeter data is clearly evidenced even at a 1∕4° resolution. Seven-day forecasts of sea level and ocean currents are significantly improved when moving from one altimeter to two altimeters not only on the sea level, but also on the 3-D thermohaline structure and currents. In high-eddy-energy regions, sea level and surface current 7-day forecast errors when assimilating one altimeter data set are respectively 20 and 45 % of the error of the simulation without assimilation. Seven-day forecasts of sea level and ocean currents continue to be improved when moving from one altimeter to two altimeters with a relative error reduction of almost 30 %. The addition of a third altimeter still improves the 7-day forecasts even at this medium 1∕4° resolution and brings an additional relative error reduction of about 10 %. The error level of the analysis with one altimeter is close to the 7-day forecast error level when two or three altimeter data sets are assimilated. Assimilating altimeter data also improves the representation of the 3-D ocean fields. The addition of Argo has a major impact on improving temperature and demonstrates the essential role of Argo together with altimetry in constraining a global data assimilation system. Salinity fields are only marginally improved. Results derived from these OSSEs are consistent with those derived from experiments with real data (observing system evaluations, OSEs) but they allow for more detailed characterisation of errors on analyses and 7-day forecasts. Both OSEs and OSSEs should be systematically used and intercompared to test data assimilation systems and quantify the impact of existing observing systems. 
PY 2017
PD DEC
SO Ocean Science
SN 1812-0784
PU Copernicus Gesellschaft Mbh
VL 13
IS 6
UT 000418199300002
BP 1077
EP 1092
DI 10.5194/os-13-1077-2017
ID 52780
ER

EF