An attempt to observe vertical land motion along the norwegian coast by CryoSat-2 and tide gauges

Martina Idžanović*, Christian Gerlach, Kristian Breili, Ole Baltazar Andersen

*Corresponding author for this work

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Abstract

Present-day climate-change-related ice-melting induces elastic glacial isostatic adjustment (GIA) effects, while paleo-GIA effects describe the ongoing viscous response to the melting of late-Pleistocene ice sheets. The unloading initiated an uplift of the crust close to the centers of former ice sheets. Today, vertical land motion (VLM) rates in Fennoscandia reach values up to around 10 mm/year and are dominated by GIA. Uplift signals from GIA can be computed by solving the sea-level equation (SLE), S˙ = N˙ − U˙ . All three quantities can also be determined from geodetic observations: relative sea-level variations ( S˙ ) are observed by means of tide gauges, while rates of absolute sea-level change ( N˙ ) can be observed by satellite altimetry; rates of VLM ( U˙ ) can be determined by GPS (Global Positioning System). Based on the SLE, U˙ can be derived by combining sea-surface measurements from satellite altimetry and relative sea-level records from tide gauges. In the present study, we have combined 7.5 years of CryoSat-2 satellite altimetry and tide-gauge data to estimate linear VLM rates at 20 tide gauges along the Norwegian coast. Thereby, we made use of monthly averaged tide-gauge data from PSMSL (Permanent Service for Mean Sea Level) and a high-frequency tide-gauge data set with 10-min sampling rate from NMA (Norwegian Mapping Authority). To validate our VLM estimates, we have compared them with the independent semi-empirical land-uplift model NKG2016LU_abs for the Nordic-Baltic region, which is based on GPS, levelling, and geodynamical modeling. Estimated VLM rates from 1 Hz CryoSat-2 and high-frequency tide-gauge data reflect well the amplitude of coastal VLM as provided by NKG2016LU_abs. We find a coastal average of 2.4 mm/year (average over all tide gauges), while NKG2016LU_abs suggests 2.8 mm/year; the spatial correlation is 0.58.
Original languageEnglish
Article number744
JournalRemote Sensing
Volume11
Issue number7
Number of pages12
ISSN2072-4292
DOIs
Publication statusPublished - 2019

Keywords

  • CryoSat-2
  • Land-uplift model
  • Norwegian coast
  • Tide gauges
  • Vertical land motion

Cite this

Idžanović, Martina ; Gerlach, Christian ; Breili, Kristian ; Andersen, Ole Baltazar. / An attempt to observe vertical land motion along the norwegian coast by CryoSat-2 and tide gauges. In: Remote Sensing. 2019 ; Vol. 11, No. 7.
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abstract = "Present-day climate-change-related ice-melting induces elastic glacial isostatic adjustment (GIA) effects, while paleo-GIA effects describe the ongoing viscous response to the melting of late-Pleistocene ice sheets. The unloading initiated an uplift of the crust close to the centers of former ice sheets. Today, vertical land motion (VLM) rates in Fennoscandia reach values up to around 10 mm/year and are dominated by GIA. Uplift signals from GIA can be computed by solving the sea-level equation (SLE), S˙ = N˙ − U˙ . All three quantities can also be determined from geodetic observations: relative sea-level variations ( S˙ ) are observed by means of tide gauges, while rates of absolute sea-level change ( N˙ ) can be observed by satellite altimetry; rates of VLM ( U˙ ) can be determined by GPS (Global Positioning System). Based on the SLE, U˙ can be derived by combining sea-surface measurements from satellite altimetry and relative sea-level records from tide gauges. In the present study, we have combined 7.5 years of CryoSat-2 satellite altimetry and tide-gauge data to estimate linear VLM rates at 20 tide gauges along the Norwegian coast. Thereby, we made use of monthly averaged tide-gauge data from PSMSL (Permanent Service for Mean Sea Level) and a high-frequency tide-gauge data set with 10-min sampling rate from NMA (Norwegian Mapping Authority). To validate our VLM estimates, we have compared them with the independent semi-empirical land-uplift model NKG2016LU_abs for the Nordic-Baltic region, which is based on GPS, levelling, and geodynamical modeling. Estimated VLM rates from 1 Hz CryoSat-2 and high-frequency tide-gauge data reflect well the amplitude of coastal VLM as provided by NKG2016LU_abs. We find a coastal average of 2.4 mm/year (average over all tide gauges), while NKG2016LU_abs suggests 2.8 mm/year; the spatial correlation is 0.58.",
keywords = "CryoSat-2, Land-uplift model, Norwegian coast, Tide gauges, Vertical land motion",
author = "Martina Idžanović and Christian Gerlach and Kristian Breili and Andersen, {Ole Baltazar}",
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An attempt to observe vertical land motion along the norwegian coast by CryoSat-2 and tide gauges. / Idžanović, Martina; Gerlach, Christian; Breili, Kristian; Andersen, Ole Baltazar.

In: Remote Sensing, Vol. 11, No. 7, 744, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - An attempt to observe vertical land motion along the norwegian coast by CryoSat-2 and tide gauges

AU - Idžanović, Martina

AU - Gerlach, Christian

AU - Breili, Kristian

AU - Andersen, Ole Baltazar

PY - 2019

Y1 - 2019

N2 - Present-day climate-change-related ice-melting induces elastic glacial isostatic adjustment (GIA) effects, while paleo-GIA effects describe the ongoing viscous response to the melting of late-Pleistocene ice sheets. The unloading initiated an uplift of the crust close to the centers of former ice sheets. Today, vertical land motion (VLM) rates in Fennoscandia reach values up to around 10 mm/year and are dominated by GIA. Uplift signals from GIA can be computed by solving the sea-level equation (SLE), S˙ = N˙ − U˙ . All three quantities can also be determined from geodetic observations: relative sea-level variations ( S˙ ) are observed by means of tide gauges, while rates of absolute sea-level change ( N˙ ) can be observed by satellite altimetry; rates of VLM ( U˙ ) can be determined by GPS (Global Positioning System). Based on the SLE, U˙ can be derived by combining sea-surface measurements from satellite altimetry and relative sea-level records from tide gauges. In the present study, we have combined 7.5 years of CryoSat-2 satellite altimetry and tide-gauge data to estimate linear VLM rates at 20 tide gauges along the Norwegian coast. Thereby, we made use of monthly averaged tide-gauge data from PSMSL (Permanent Service for Mean Sea Level) and a high-frequency tide-gauge data set with 10-min sampling rate from NMA (Norwegian Mapping Authority). To validate our VLM estimates, we have compared them with the independent semi-empirical land-uplift model NKG2016LU_abs for the Nordic-Baltic region, which is based on GPS, levelling, and geodynamical modeling. Estimated VLM rates from 1 Hz CryoSat-2 and high-frequency tide-gauge data reflect well the amplitude of coastal VLM as provided by NKG2016LU_abs. We find a coastal average of 2.4 mm/year (average over all tide gauges), while NKG2016LU_abs suggests 2.8 mm/year; the spatial correlation is 0.58.

AB - Present-day climate-change-related ice-melting induces elastic glacial isostatic adjustment (GIA) effects, while paleo-GIA effects describe the ongoing viscous response to the melting of late-Pleistocene ice sheets. The unloading initiated an uplift of the crust close to the centers of former ice sheets. Today, vertical land motion (VLM) rates in Fennoscandia reach values up to around 10 mm/year and are dominated by GIA. Uplift signals from GIA can be computed by solving the sea-level equation (SLE), S˙ = N˙ − U˙ . All three quantities can also be determined from geodetic observations: relative sea-level variations ( S˙ ) are observed by means of tide gauges, while rates of absolute sea-level change ( N˙ ) can be observed by satellite altimetry; rates of VLM ( U˙ ) can be determined by GPS (Global Positioning System). Based on the SLE, U˙ can be derived by combining sea-surface measurements from satellite altimetry and relative sea-level records from tide gauges. In the present study, we have combined 7.5 years of CryoSat-2 satellite altimetry and tide-gauge data to estimate linear VLM rates at 20 tide gauges along the Norwegian coast. Thereby, we made use of monthly averaged tide-gauge data from PSMSL (Permanent Service for Mean Sea Level) and a high-frequency tide-gauge data set with 10-min sampling rate from NMA (Norwegian Mapping Authority). To validate our VLM estimates, we have compared them with the independent semi-empirical land-uplift model NKG2016LU_abs for the Nordic-Baltic region, which is based on GPS, levelling, and geodynamical modeling. Estimated VLM rates from 1 Hz CryoSat-2 and high-frequency tide-gauge data reflect well the amplitude of coastal VLM as provided by NKG2016LU_abs. We find a coastal average of 2.4 mm/year (average over all tide gauges), while NKG2016LU_abs suggests 2.8 mm/year; the spatial correlation is 0.58.

KW - CryoSat-2

KW - Land-uplift model

KW - Norwegian coast

KW - Tide gauges

KW - Vertical land motion

U2 - 10.3390/rs11070744

DO - 10.3390/rs11070744

M3 - Journal article

VL - 11

JO - Remote Sensing

JF - Remote Sensing

SN - 2072-4292

IS - 7

M1 - 744

ER -