A reassessment of global and regional mean sea level trends from TOPEX and Jason‐1 altimetry based on revised reference frame and orbits

Beckley, B. D.; Lemoine, F. G.; Luthcke, S. B.; Ray, Richard D.; Zelensky, N. P.

doi:10.1029/2007gl030002

Cited by 154 publications

(105 citation statements)

References 44 publications

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“…Several studies have been already performed (Mitchum 1998 andChambers, 1998) showing the good consistency between altimeter and tide gauge measurements. More recent results (Beckley and al., 2007), based on a 64-site high quality tide gauges, provide an estimation of the drift derived from insitu and altimeter measurements, of 0.04 mm/year for T/P between 1993 and 2002 and 0.69 mm/year for Jason-1 from 2002 through 2006 included. We present here a new assessment of these long-term comparisons until 2008 in agreement with our MSL calculation based on a larger number of tide gauges.…”

Section: Estimation Of Altimeter Msl Driftmentioning

confidence: 99%

“…Since 1993, altimeter measurements from TOPEX/Poseidon (T/P) and Jason-1 satellites provide precise MSL measurements with global coverage (e.g., Nerem and Mitchum, 2001;Cazenave and Nerem, 2004; Correspondence to: M. Ablain (michael.ablain@cls.fr) et al, 2004;Nerem et al, 2006). The most recently published study using altimeter data reports a global MSL rate of 3.3±0.4 mm/yr over the 1993-2006 time span (Beckley et al, 2007). If the Global Isostatic Adjustment (GIA) correction (of about −0.3 mm/yr; (Peltier, 2004)) is accounted, this rate increases to 3.6 mm/yr.…”

Section: Introductionmentioning

confidence: 99%

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A new assessment of the error budget of global mean sea level rate estimated by satellite altimetry over 1993–2008

et al. 2009

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Abstract. A new error budget assessment of the global Mean Sea Level (MSL) determined by TOPEX/Poseidon and Jason-1 altimeter satellites between January 1993 and June 2008 is presented using last altimeter standards. We discuss all potential errors affecting the calculation of the global MSL rate. We also compare altimetry-based sea level with tide gauge measurements over the altimetric period. Applying a statistical approach, this allows us to provide a realistic error budget of the MSL rise measured by satellite altimetry. These new calculations highlight a reduction in the rate of sea level rise since 2005, by ∼2 mm/yr. This represents a 60% reduction compared to the 3.3 mm/yr sea level rise (glacial isostatic adjustment correction applied) measured between 1993 and 2005. Since November 2005, MSL is accurately measured by a single satellite, Jason-1. However the error analysis performed here indicates that the recent reduction in MSL rate is real.

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Section: Estimation Of Altimeter Msl Driftmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new assessment of the error budget of global mean sea level rate estimated by satellite altimetry over 1993–2008

et al. 2009

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“…In addition, regional altimetry is more sensitive to errors that are often negligible when calculating the global average. This could be errors in the ocean tide model, sea state corrections, and orbital errors [28].…”

Section: Analysis Of Altimetry Data From the Norwegian Coastmentioning

confidence: 99%

Observed Sea-Level Changes along the Norwegian Coast

Breili

Simpson

Nilsen

2017

JMSE

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Norway's national sea level observing system consists of an extensive array of tide gauges, permanent GNSS stations, and lines of repeated levelling. Here, we make use of this observation system to calculate relative sea-level rates and rates corrected for glacial isostatic adjustment (GIA) along the Norwegian coast for three different periods, i.e., 1960 to 2010, 1984 to 2014, and 1993 to 2016. For all periods, the relative sea-level rates show considerable spatial variations that are largely due to differences in vertical land motion due to GIA. The variation is reduced by applying corrections for vertical land motion and associated gravitational effects on sea level. For 1960 to 2010 and 1984 to 2014, the coastal average GIA-corrected rates for Norway are 2.0 ± 0.6 mm/year and 2.2 ± 0.6 mm/year, respectively. This is close to the rate of global sea-level rise for the same periods. For the most recent period, 1993 to 2016, the GIA-corrected coastal average is 3.5 ± 0.6 mm/year and 3.2 ± 0.6 mm/year with and without inverse barometer (IB) corrections, respectively, which is significantly higher than for the two earlier periods. For 1993 to 2016, the coastal average IB-corrected rates show broad agreement with two independent sets of altimetry. This suggests that there is no systematic error in the vertical land motion corrections applied to the tide-gauge data. At the same time, altimetry does not capture the spatial variation identified in the tide-gauge records. This could be an effect of using altimetry observations off the coast instead of directly at each tide gauge. Finally, we note that, owing to natural variability in the climate system, our estimates are highly sensitive to the selected study period. For example, using a 30-year moving window, we find that the estimated rates may change by up to 1 mm/year when shifting the start epoch by only one year.

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“…In particular, successful monitoring of the long-term evolution of sea level, from both space (with radar altimeters) and the ground (with tide gauges), depends on a stable and accurate TRF [e.g., Morel and Willis, 2005;Beckley et al, 2007;Blewitt et al, 2010;Collilieux and Wöppelmann, 2011;Fu and Haines, 2013]. Driven in large measure by the demands of sea level monitoring, international initiatives are underway to improve the stability of the TRF to the 0.1 mm yr −1 level [Plag and Pearlman, 2009;NRC, 2010;Merkowitz et al, 2012].…”

Section: Introductionmentioning

confidence: 99%

Realizing a terrestrial reference frame using the Global Positioning System

et al. 2015

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We describe a terrestrial reference frame (TRF) realization based on Global Positioning System (GPS) data alone. Our approach rests on a highly dynamic, long‐arc (9 day) estimation strategy and on GPS satellite antenna calibrations derived from Gravity Recovery and Climate Experiment and TOPEX/Poseidon low Earth orbit receiver GPS data. Based on nearly 17 years of data (1997–2013), our solution for scale rate agrees with International Terrestrial Reference Frame (ITRF)2008 to 0.03 ppb yr−1, and our solution for 3‐D origin rate agrees with ITRF2008 to 0.4 mm yr−1. Absolute scale differs by 1.1 ppb (7 mm at the Earth's surface) and 3‐D origin by 8 mm. These differences lie within estimated error levels for the contemporary TRF.

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A reassessment of global and regional mean sea level trends from TOPEX and Jason‐1 altimetry based on revised reference frame and orbits

Cited by 154 publications

References 44 publications

A new assessment of the error budget of global mean sea level rate estimated by satellite altimetry over 1993–2008

A new assessment of the error budget of global mean sea level rate estimated by satellite altimetry over 1993–2008

Observed Sea-Level Changes along the Norwegian Coast

Realizing a terrestrial reference frame using the Global Positioning System

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