Comparison of satellite altimetry sea level anomalies and hydrographic observations in the Mediterranean Sea
DOI:
https://doi.org/10.3989/scimar.03515.02GKeywords:
steric sea level, hydrographic observations, Mediterranean Sea, satellite altimetry, in situ profiles, gridded productsAbstract
Steric sea level (SSL) computed from hydrographic observations in the Mediterranean Sea is compared against altimetric sea level anomalies (SLA) at seasonal and inter-annual time scales for the period 1993-2008. SSL (referenced to 300 m) is computed using two data sets: in situ profiles and gridded products obtained from interpolated observations. The impact of expendable/mechanical bathythermograph (XBT/MBT) biases affecting some of the in situ profiles is investigated by comparing both corrected and uncorrected data. For the period 2003-2008 the mass component is estimated from GRACE observations and subtracted from SLA. The analysis of the spatio-temporal distribution of profiles shows that the number of profiles with data below 300 m is a small percentage of the total and that their spatial coverage of the Mediterranean basin is very limited. This is an important handicap for regions where the contribution of the deep layers to SSL is significant. Overall, SSL and SLA are shown to be consistent in the Mediterranean at seasonal time scales, although the annual amplitude of the SSL from in situ profiles and interpolated data is considerably smaller than that of the SLA. The agreement at inter-annual time scales is less good. At some particular locations SSL computed from individual profiles is more correlated with SLA than the gridded products. At basin and sub-basin scales, however, interpolated and in situ observations provide similar results in terms of their correlation with observed SLA. The XBT/MBT bias corrections have little effect on the SSL at the time scales considered in this study.
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References
Antonov J.I., Levitus S., Boyer T.P. 2005. Thermosteric sea level rise, 1955-2003. Geophys. Res. Lett. 32: L12602. http://dx.doi.org/10.1029/2005GL023112
Calafat F.M., Marcos M., Gomis D. 2010. Mass contribution to the Mediterranean Sea level variability for the period 1948-2000. Global Planet. Change 73: 193-201. http://dx.doi.org/10.1016/j.gloplacha.2010.06.002
Carrère L., Lyard F. 2003. Modeling the barotropic response of the global ocean to atmospheric wind and pressure forcing - comparisons with observations. Geophys. Res. Lett. 30(6): 1275. http://dx.doi.org/10.1029/2002GL016473
Cazenave A., Dominh K., Guinehut S., Berthier E., Llovel W., Ramillien G., Ablain M., Larnicol G. 2009. Sea level budget over 2003-2008: A reevaluation from GRACE space gravimetry, satellite altimetry and Argo. Global Planet. Change 65: 83-88. http://dx.doi.org/10.1016/j.gloplacha.2008.10.004
Cazenave A., Llovel W. 2010. Contemporary sea level rise. Annu. Rev. Mar. Sci. 2: 145-73. http://dx.doi.org/10.1146/annurev-marine-120308-081105 PMid :21141661
Chambers D.P. 2006a. Observing seasonal SSL variations with GRACE and satellite altimetry. J. Geophys. Res. 111: C03010. http://dx.doi.org/10.1029/2005JC002914
Chambers D.P. 2006b. Evaluation of New GRACE Time-Variable Gravity Data over the Ocean. Geophys. Res. Lett. 33(17): L17603. http://dx.doi.org/10.1029/2006GL027296
Criado-Aldeanueva F., Del Río Vera J., García-Lafuente J. 2008. Steric and mass induced Mediterranean sea level trends from 14 years of altimetry data. Global Planet. Change 60: 563-575. http://dx.doi.org/10.1016/j.gloplacha.2007.07.003
Dhomps A.L., Guinehut S., Le Traon P.Y., Larnicol G. 2011. A global comparison of Argo and satellite altimetry observations. Ocean Sci. 7: 175-183. http://dx.doi.org/10.5194/os-7-175-2011
Domingues C.M., Church J.A., White N.J., Glecker P.J., Wijffels S.E., Barker P.M., Dunn J.R. 2008. Improved estimates of upper-ocean warming and multi-decadal sea level rise. Nature 453: 1090-1094. http://dx.doi.org/10.1038/nature07080 PMid :18563162
Ducet N., Le Traon P.Y., Reverdin G. 2000. Global high-resolution mapping of ocean circulation from the combination of T/P and ERS-1/2. J. Geophys. Res. 105: 19477-19498. http://dx.doi.org/10.1029/2000JC900063
Fenoglio-Marc L., 2002. Long-term sea level change in the Mediterranean Sea from multi-satellite altimetry and tide gauges. Phys. Chem. Earth 27: 1419-1431. http://dx.doi.org/10.1016/S1474-7065(02)00084-0
Fenoglio-Marc L., Kusche J., Becker M. 2006. Mass variation in the Mediterranean Sea from GRACE and its validation by altimetry, steric and hydrologic fields. Geophys. Res. Lett. 33: L19606. http://dx.doi.org/10.1029/2006GL026851
García-García D., Chao B.F., Boy J.-P. 2010. Steric and mass-induced sea level variations in the Mediterranean Sea revisited. J. Geophys. Res. 115: C12016. PMid :20463844 PMCid:2867361
Gouretski V., Koltermann K.P. 2007. How much is the ocean really warming? Geophys. Res. Lett. 34: L01610. http://dx.doi.org/10.1029/2006GL027834
Guinehut S., Le Traon P.Y., Larnicol G. 2006. What can we learn from Global Altimetry/Hydrography comparisons? Geophys. Res. Lett. 33: L10604. http://dx.doi.org/10.1029/2005GL025551
Guinehut S., Coatanoan C., Dhomps A.L., Le Traon P.Y., Larnicol G. 2009. On the use of satellite altimeter data in Argo quality control. J. Atmos. Oceanic Technol. 26: 395-402. http://dx.doi.org/10.1175/2008JTECHO648.1
Herburn G.W., La Violette P. 1990. Variations in the structure of the anticyclonic gyres found in the Alboran Sea. J. Geophys. Res. 95 (C2): 1599-1613. http://dx.doi.org/10.1029/JC095iC02p01599
Herrmann M., Somot S., Sevault F., Estournel C., Déqué M. 2008. Modeling the deep convection in the northwestern Mediterranean Sea using an eddy-permitting and eddy-resolving model: Case study of winter 1986-1987. J. Geophys. Res. 113: C04011. http://dx.doi.org/10.1029/2006JC003991
Herrmann M., Bouffard J., Beranger K. 2009. Monitoring open-ocean deep convection from space. Geophys. Res. Lett. 36: L03606. http://dx.doi.org/10.1029/2008GL036422
Ingleby B., Huddleston M. 2007. Quality control of ocean temperature and salinity profiles - historical and real-time data. J. Mar. Syst. 65: 158-175. http://dx.doi.org/10.1016/j.jmarsys.2005.11.019
Ishii M., Kimoto M. 2009. Reevaluation of historical ocean heat content variations with time-varying XBT and MBT depth bias corrections. J. Oceanogr. 65: 287-299. http://dx.doi.org/10.1007/s10872-009-0027-7
Le Traon P.-Y., Nadal F., Ducet N. 1998. An improved mapping method of multisatellite altimeter data. J. Atmos. Oceanic Technol. 15: 522-534. http://dx.doi.org/10.1175/1520-0426(1998)015<0522:AIMMOM>2.0.CO;2
Levitus S., Antonov J.I., Boyer T.P., Locarnini R.A., Garcia H.E., Mishonov A.V. 2009. Global ocean heat content 1955-2008 in light of recently revealed instrumentation problems. Geophys. Res. Lett. 36: L07608. http://dx.doi.org/10.1029/2008GL037155
Lombard A., Cazenave A., Le Traon P.Y., Ishii M. 2005. Contribution of thermal expansion to present-day sea-level change revisited. Global Planet. Change 47: 1-16. http://dx.doi.org/10.1016/j.gloplacha.2004.11.016
Lyman J.M., Good S.A., Gouretski V.V., Ishii M., Johnson G.C., Palmer M.D., Smith D.M., Willis J.K. 2010. Robust warming of the global upper ocean. Nature 465: 334-337. http://dx.doi.org/10.1038/nature09043 PMid :20485432
Marcos M., Tsimplis M.N. 2007. Variations of the seasonal sea level cycle in southern Europe. J. Geophys. Res. 112: C12011. http://dx.doi.org/10.1029/2006JC004049
Marcos M., Calafat F.M., Llovel W., Gomis D., Meyssignac B. 2011. Regional distribution of steric and mass contributions to sea level changes. Global Planet. Change 76: 206-218. http://dx.doi.org/10.1016/j.gloplacha.2011.01.007
Paulson A., Zhong S., Wahr J. 2007. Inference of mantle viscosity from GRACE and relative sea level data. Geophys. J. Int. 171: 497-508. http://dx.doi.org/10.1111/j.1365-246X.2007.03556.x
Rixen M., Beckers J.M., Levitus S., Antonov J.I., Boyer T., Maillard C., Fichaut M., Balopoulos E., Iona S., Dooley H., Garcia M.J., Manca B., Giorgetti A., Manzella G., Mikhailov N., Pinardi N., Zavatarelli M., the Medar Consortium 2005. The Western Mediterranean Deep Water: a proxy for climate change. Geophys. Res. Lett. 32: L12608.
Schroeder K., Ribotti A., Borghini M., Sorgente R., Perilli A., Gasparini G.P. 2008. An extensive western Mediterranean deep water renewal between 2004 and 2006. Geophys. Res. Lett. 35: L18605. http://dx.doi.org/10.1029/2008GL035146
Ssalto/Duacs User Handbook: (M)SLA and (M)ADT Near-Real Time and Delayed Time Products. SALP-MU-P-EA-21065-CLS.
Tsimplis M.N., Marcos M., Colin J., Somot S., Pascual A., Shaw A.G.P. 2009. Sea level variability in the Mediterranean Sea during the 1990s on the basis of two 2d and one 3d model. J. Mar. Syst. 78: 109-123. http://dx.doi.org/10.1016/j.jmarsys.2009.04.003
Vargas-Yáñez M., Plaza F., García-Lafuente J., Sarhan T., Vargas J.M., Velez-Belchi P. 2002. About the seasonal variability of the Alboran Sea circulation. J. Mar. Syst. 35: 229-248. http://dx.doi.org/10.1016/S0924-7963(02)00128-8
Volkov D.L., Larnicol G., Dorandeu J. 2007. Improving the quality of satellite altimetry data over continental shelves. J. Geophys. Res. 112: C06020. http://dx.doi.org/10.1029/2006JC003765
Wijffels S., Willis J.K., Domingues C.M., Barker P., White N.J., Gronell A., Ridgway K., Church J.A. 2008. Changing expendable bathythermograph fall rates and their impact on estimates of thermosteric sea level rise. J. Climate 21: 5657-5672. http://dx.doi.org/10.1175/2008JCLI2290.1
Willis J.K., Lyman J.M., Johnson G.C., Gilson J. 2009. In situ data biases and recent ocean heat content Variability. J. Atmos. Oceanic Technol. 26: 846-852. http://dx.doi.org/10.1175/2008JTECHO608.1
Willis J.K., Chambers D.P., Kuo C.Y., Shum C.K. 2010. Global sea level rise: Recent progress and challenges for the decade to come. Oceanography 23(4): 26-35. http://dx.doi.org/10.5670/oceanog.2010.03
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