Sea level budget over 2005–2013: missing contributions and data errors

Abstract. Based on the sea level budget closure approach, this study investigates the residuals between observed global mean sea level (GMSL) and the sum of components (steric sea level and ocean mass) for the period January 2005 to December 2013. The objective is to identify the impact of errors in one or several components of the sea level budget on the residual time series. This is a key issue if we want to constrain missing contributions such as the contribution to sea level rise from the deep ocean (depths not covered by observations). For that purpose, we use several data sets as processed by different groups: six altimetry products for the GMSL, four Argo products plus the ORAS4 ocean reanalysis for the steric sea level and three GRACE-based ocean mass products. We find that over the study time span, the observed differences in trend of the residuals of the sea level budget equation can be as large as ~ 0.55 mm yr−1 (i.e., ~ 17 % of the observed GMSL rate of rise). These trend differences essentially result from differences in trends of the GMSL time series. Using the ORAS4 reanalysis (providing complete geographical coverage of the steric sea level component), we also show that lack of Argo data in the Indonesian region leads to an overestimate of the absolute value of the residual trend by about 0.25 mm yr−1. Accounting for this regional contribution leads to closure of the sea level budget, at least for some GMSL products. At short timescales (from sub-seasonal to interannual), residual anomalies are significantly correlated with ocean mass and steric sea level anomalies (depending on the time span), suggesting that the residual anomalies are related to errors in both GRACE-based ocean mass and Argo-based steric data. Efforts are needed to reduce these various sources of errors before using the sea level budget approach to estimate missing contributions such as the deep ocean heat content.

[1]  W. Peltier.  GLOBAL GLACIAL ISOSTASY AND THE SURFACE OF THE ICE-AGE EARTH: The ICE-5G (VM2) Model and GRACE , 2004 .

[2]  Low-frequency exchange of mass between ocean basins , 2009 .

[3]  R. Steven Nerem,et al.  Ocean mass from GRACE and glacial isostatic adjustment , 2010 .

[4]  S. Solomon,et al.  Contributions of Stratospheric Water Vapor to Decadal Changes in the Rate of Global Warming , 2010, Science.

[5]  Kevin E. Trenberth,et al.  Tracking Earth's Energy , 2010, Science.

[6]  Corinne Le Quéré,et al.  Rapid growth in CO2 emissions after the 2008-2009 global financial crisis , 2011 .

[7]  K. Schuckmann,et al.  How well can we derive Global Ocean Indicators from Argo data , 2011 .

[8]  Jens Schröter,et al.  Measuring ocean mass variability from satellite gravimetry , 2011 .

[9]  Makiko Sato,et al.  Earth's energy imbalance and implications , 2011, 1105.1140.

[10]  David R. Doelling,et al.  Advances in Understanding Top-of-Atmosphere Radiation Variability from Satellite Observations , 2012, Surveys in Geophysics.

[11]  R. S. Nerem,et al.  Comparison of Global Mean Sea Level Time Series from TOPEX/Poseidon, Jason-1, and Jason-2 , 2012 .

[12]  Don P. Chambers,et al.  Evaluation of Release-05 GRACE time-variable gravity coefficients over the ocean , 2012 .

[13]  R. Steven Nerem,et al.  The 2011 La Niña: So strong, the oceans fell , 2012 .

[14]  A. Cazenave,et al.  Effect of the processing methodology on satellite altimetry-based global mean sea level rise over the Jason-1 operating period , 2014, Journal of Geodesy.

[15]  Kevin E. Trenberth,et al.  An apparent hiatus in global warming? , 2013 .

[16]  Makiko Sato,et al.  Strengthening of ocean heat uptake efficiency associated with the recent climate hiatus , 2013 .

[17]  Yu Kosaka,et al.  Recent global-warming hiatus tied to equatorial Pacific surface cooling , 2013, Nature.

[18]  F. Doblas-Reyes,et al.  Retrospective prediction of the global warming slowdown in the past decade , 2013 .

[19]  M. Balmaseda,et al.  Evaluation of the ECMWF ocean reanalysis system ORAS4 , 2013 .

[20]  D. Chambers,et al.  Ocean bottom pressure seasonal cycles and decadal trends from GRACE Release-05: Ocean circulation implications , 2013 .

[21]  John Abraham,et al.  A review of global ocean temperature observations: Implications for ocean heat content estimates and climate change , 2013, Reviews of Geophysics.

[22]  Climate science: The cause of the pause , 2013, Nature.

[23]  Oceanography: Has global warming stalled? , 2013 .

[24]  Kevin E. Trenberth,et al.  Distinctive climate signals in reanalysis of global ocean heat content , 2013 .

[25]  Nick Rayner,et al.  EN4: Quality controlled ocean temperature and salinity profiles and monthly objective analyses with uncertainty estimates , 2013 .

[26]  K. Tung,et al.  Varying planetary heat sink led to global-warming slowdown and acceleration , 2014, Science.

[27]  J. Willis,et al.  Deep-ocean contribution to sea level and energy budget not detectable over the past decade , 2014 .

[28]  Agus Santoso,et al.  Recent intensification of wind-driven circulation in the Pacific and the ongoing warming hiatus , 2014 .

[29]  G. Johnson,et al.  Estimating Global Ocean Heat Content Changes in the Upper 1800 m since 1950 and the Influence of Climatology Choice , 2014 .

[30]  Anny Cazenave,et al.  The rate of sea-level rise , 2014 .

[31]  D. Chambers,et al.  Consistency of the current global ocean observing systems from an Argo perspective , 2014 .

[32]  Kevin E. Trenberth,et al.  Earth’s Energy Imbalance , 2014 .

[33]  Thomas C. Peterson,et al.  Possible artifacts of data biases in the recent global surface warming hiatus , 2015, Science.

[34]  Dean Roemmich,et al.  Unabated planetary warming and its ocean structure since 2006 , 2015 .

[35]  Sergei Rudenko,et al.  Improved Sea Level record over the satellite altimetry era (1993-2010) from the Climate Change Initiative project , 2015 .

[36]  J. Willis,et al.  Recent hiatus caused by decadal shift in Indo-Pacific heating , 2015, Science.

[37]  A. Cazenave,et al.  The Sea Level Budget Since 2003: Inference on the Deep Ocean Heat Content , 2015, Surveys in Geophysics.