New estimate of the current rate of sea level rise from a sea level budget approach

Dieng, H. B.; Cazenave, Anny; Meyssignac, Benoît; Ablain, M.

doi:10.1002/2017gl073308

Cited by 207 publications

(236 citation statements)

References 52 publications

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“…For the v2.0 GMSL, the same trend of 3.3 mm yr −1 is found for the 1993-2003 and 2005-2015 altimetry decades, indicating a steady rise of the GMSL. However, several recent studies using different approaches suggest that an instrumental drift has affected the TOPEX-A altimeter measurements during 1993(Valladeau et al, 2012Watson et al, 2015;Dieng et al, 2017;Beckley et al, 2017). The instrumental drift of the TOPEX-A altimeter has long been known (Hayne and Handcock, 1998), leading to the switch early 1999 to the redundant TOPEX-B altimeter.…”

Section: Long-term Gmsl Evolutionmentioning

confidence: 99%

“…Account-ing for the TOPEX-A instrumental correction for the first 6 years of the altimetry dataset, these studies provided a revised GMSL time series that slightly reduces the average GMSL rise over the altimetry era (from 3.3 to 3.0 mm yr −1 ), but shows clear acceleration over 1993-present. Using the corrected GMSL time series, Dieng et al (2017) and Chen et al (2017) found improved closure of the sea level budget compared to the uncorrected data.…”

Section: Long-term Gmsl Evolutionmentioning

confidence: 99%

“…The 1.5 mm yr −1 correction supposed to represent the TOPEX-A drift has been applied to the GMSL time series for 1993-1998 specifically in this figure as discussed in Sect. 4.1; see Dieng et al (2017) for details. We have also used the SL_cci v2.0 time series as well as additional GMSL products provided by other groups (DU-ACS DT2014 distributed by CMEMS -previously AVISOUniversity of Colorado, NOAA, NASA/GSFC and CSIRO) to compute the differences between each individual GMSL time series and the ensemble mean GMSL over 1993-2015.…”

Section: Global Mean Sea Level Budget Closurementioning

confidence: 99%

“…Watson et al (2015) compared altimetry-based sea level with vertical land motion-corrected tide gauge data and estimated a TOPEX-A drift correction to the 1993-1998 GMSL trend in the range 0.9 ± 0.5 to 1.5 ± 0.5 mm yr −1 , with 1.5 mm yr −1 being the preferred value. Using a sea level budget approach, Dieng et al (2017) also estimated the TOPEX-A drift correction to 1.5 ± 0.5 mm yr −1 for 1993-1998. Another approach was followed by Beckley et al (2017), consisting of suppressing the so-called "internal calibrationmode" range correction, included in the TOPEX-A "net instrument" correction and considered as suspect.…”

Section: Long-term Gmsl Evolutionmentioning

confidence: 99%

“…We have considered the whole altimetry era and used the various datasets considered in Dieng et al (2017) to estimate the individual mass contributions (glaciers, ice sheets, stored land water, atmospheric water vapour and snow) of Eq. (1).…”

Section: Global Mean Sea Level Budget Closurementioning

confidence: 99%

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An improved and homogeneous altimeter sea level record from the ESA Climate Change Initiative

Legeais

Ablain

Zawadzki

et al. 2018

Earth Syst. Sci. Data

177

135

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Abstract. Sea level is a very sensitive index of climate change since it integrates the impacts of ocean warming and ice mass loss from glaciers and the ice sheets. Sea level has been listed as an essential climate variable (ECV) by the Global Climate Observing System (GCOS). During the past 25 years, the sea level ECV has been measured from space by different altimetry missions that have provided global and regional observations of sea level variations. As part of the Climate Change Initiative (CCI) program of the European Space Agency (ESA) (established in 2010), the Sea Level project (SL_cci) aimed to provide an accurate and homogeneous long-term satellite-based sea level record. At the end of the first phase of the project (2010)(2011)(2012)(2013), an initial version (v1.1) of the sea level ECV was made available to users . During the second phase of the project (2014-2017), improved altimeter standards were selected to produce new sea level products (called SL_cci v2.0) based on nine altimeter missions for the period 1993-2015 (https://doi.org/10.5270/esa-sea_level_cci-1993_2015-v_2.0-201612; Legeais and the ESA SL_cci team, 2016c). Corresponding orbit solutions, geophysical corrections and altimeter standards used in this v2.0 dataset are described in detail in Quartly et al. (2017). The present paper focuses on the description of the SL_cci v2.0 ECV and associated uncertainty and discusses how it has been validated. Various approaches have been used for the quality assessment such as internal validation, comparisons with sea level records from other groups and with in situ measurements, sea level budget closure analyses and comparisons with model outputs. Compared with the previous version of the sea level ECV, we show that use of improved geophysical corrections, careful bias reduction between missions and inclusion of new altimeter missions lead to improved sea level products with reduced uncertainties on different spatial and temporal scales. However, there is still room for improvementPublished by Copernicus Publications. 282J.-F. Legeais et al.: An improved and homogeneous altimeter sea level record from the ESA since the uncertainties remain larger than the GCOS requirements (GCOS, 2011). Perspectives on subsequent evolution are also discussed.

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Section: Long-term Gmsl Evolutionmentioning

confidence: 99%

Section: Long-term Gmsl Evolutionmentioning

confidence: 99%

Section: Global Mean Sea Level Budget Closurementioning

confidence: 99%

Section: Long-term Gmsl Evolutionmentioning

confidence: 99%

Section: Global Mean Sea Level Budget Closurementioning

confidence: 99%

See 3 more Smart Citations

An improved and homogeneous altimeter sea level record from the ESA Climate Change Initiative

Legeais

Ablain

Zawadzki

et al. 2018

Earth Syst. Sci. Data

177

135

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Slowdown of global surface air temperature increase and acceleration of ice melting

Yin

Nifenecker²,

Poitou³

2017

Earth's Future

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Although recent decades have been the warmest since 1850, and global mean temperatures during 2015 and 2016 beat all instrumental records, the rate of increase in global surface air temperature (GSAT) significantly decreased at the beginning of the 21st Century. In this context, we examine the roles of ice melting and associated increase in sea‐water mass, both of which significantly increased at the same time as GSAT decreased. Specifically, we show that (1) the slowdown of the rate of increase in GSAT between the specific periods 1992–2001 and 2002–2011 exists in all three climate records analyzed and is statistically significant at the 5% level amounting between 0.029 and 0. 036°C/yr and leaving an energy of 14.8–18.4 1019 J/yr available; (2) the increase of the atmosphere‐related ice melt between these two periods amounts to 316 Gt/yr which requires 10.5 1019 J/yr, that is, between 57% and 71% of the energy left by the slowdown; and (3) the energy budget shows, therefore, that the heat required to melt this additional 316 Gt/yr of ice is of the same order as the energy needed to warm the atmosphere during the decade 2002–2011 as much as during the previous one, suggesting a redistribution of heat within the atmosphere–cryosphere system.

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Acceleration in the Global Mean Sea Level Rise: 2005–2015

Heki

2017

Geophysical Research Letters

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Global mean sea level rise has been accelerating for more than 100 years, and the acceleration in the last two decades seems to further increase. The latest development in geodetic and marine observations enables us to scrutinize and understand the sources of the sea level acceleration in the last decade. For this end, observations from satellite altimetry, gravimetry, and in situ measurements of the ocean between 2005 and 2015 are combined, and their closure is examined. Our results show that the acceleration during the last decade (0.27 ± 0.17 mm/yr2) is about 3 times faster than its value during 1993–2014. The acceleration comes from three factors, that is, 0.04 ± 0.01 mm/yr2 (~15%) by land ice melting, 0.12 ± 0.06 mm/yr2 (~44%) by thermal expansion of the seawater, and 0.11 ± 0.02 mm/yr2 (~41%) by declining land water storage. Although these values in 11 years may suffer from natural variabilities, they shed light on the underlying mechanisms of sea level acceleration and reflect its susceptibility to the global warming.

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New estimate of the current rate of sea level rise from a sea level budget approach

Cited by 207 publications

References 52 publications

An improved and homogeneous altimeter sea level record from the ESA Climate Change Initiative

An improved and homogeneous altimeter sea level record from the ESA Climate Change Initiative

Slowdown of global surface air temperature increase and acceleration of ice melting

Acceleration in the Global Mean Sea Level Rise: 2005–2015

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