Toyoda T., Fujii Y., Kuragano T., Kamachi M., Ishikawa Y., Masuda S., Sato K., Awaji T., Hernandez Fabrice, Ferry N., Guinehut S., Martin M. J., Peterson K. A., Good S. A., Valdivieso M., Haines K., Storto A., Masina S., Kohl A., Zuo H., Balmaseda M., Yin Y. H., Shi L., Alves O., Smith G., Chang Y. S., Vernieres G., Wang X. C., Forget G., Heimbach P., Wang O., Fukumori I., Lee T. (2017). Intercomparison and validation of the mixed layer depth fields of global ocean syntheses. In :
Ocean estimation from an ensemble of global ocean reanalyses, consisting of papers from the Ocean Reanalyses Intercomparison Project (ORAIP). Climate Dynamics, 49 (3 (No spécial)), p. 753-773. ISSN 0930-7575.
Titre du document
Intercomparison and validation of the mixed layer depth fields of global ocean syntheses
Année de publication
2017
Auteurs
Toyoda T., Fujii Y., Kuragano T., Kamachi M., Ishikawa Y., Masuda S., Sato K., Awaji T., Hernandez Fabrice, Ferry N., Guinehut S., Martin M. J., Peterson K. A., Good S. A., Valdivieso M., Haines K., Storto A., Masina S., Kohl A., Zuo H., Balmaseda M., Yin Y. H., Shi L., Alves O., Smith G., Chang Y. S., Vernieres G., Wang X. C., Forget G., Heimbach P., Wang O., Fukumori I., Lee T.
In
Ocean estimation from an ensemble of global ocean reanalyses, consisting of papers from the Ocean Reanalyses Intercomparison Project (ORAIP)
Source
Climate Dynamics, 2017,
49 (3 (No spécial)), p. 753-773 ISSN 0930-7575
Intercomparison and evaluation of the global ocean surface mixed layer depth (MLD) fields estimated from a suite of major ocean syntheses are conducted. Compared with the reference MLDs calculated from individual profiles, MLDs calculated from monthly mean and gridded profiles show negative biases of 10-20 m in early spring related to the re-stratification process of relatively deep mixed layers. Vertical resolution of profiles also influences the MLD estimation. MLDs are underestimated by approximately 5-7 (14-16) m with the vertical resolution of 25 (50) m when the criterion of potential density exceeding the 10-m value by 0.03 kg m(-3) is used for the MLD estimation. Using the larger criterion (0.125 kg m(-3)) generally reduces the underestimations. In addition, positive biases greater than 100 m are found in wintertime subpolar regions when MLD criteria based on temperature are used. Biases of the reanalyses are due to both model errors and errors related to differences between the assimilation methods. The result shows that these errors are partially cancelled out through the ensemble averaging. Moreover, the bias in the ensemble mean field of the reanalyses is smaller than in the observation-only analyses. This is largely attributed to comparably higher resolutions of the reanalyses. The robust reproduction of both the seasonal cycle and interannual variability by the ensemble mean of the reanalyses indicates a great potential of the ensemble mean MLD field for investigating and monitoring upper ocean processes.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Limnologie physique / Océanographie physique [032]
Description Géographique
MONDE
Localisation
Fonds IRD [F B010070871]
Identifiant IRD
fdi:010070871
