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Detection and attribution of intra-annual mass component of sea-level variations along the Norwegian coast (2023)

Mangini, F. ; Bonaduce, A. ; Chafik, L. ; [et al.]

In: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

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Publication Date: 2023-06-28

Description: Reliable sea-level observations in coastal regions are needed to assess the impact of sea level on coastal communities and ecosystems. This paper evaluates the ability of in-situ and remote sensing instruments to monitor and help explain the mass component of sea level along the coast of Norway. The general agreement between three different GRACE mascon solutions and a combination of coastal satellite altimetry and hydrography gives us confidence to explore the mass component of sea level in coastal areas on intra-annual timescales. At first, the estimates reveal a large spatial-scale coherence of the sea-level mass component on the shelf, which agrees with Ekman theory. Then, they suggest a link between the mass component of sea level and the along-slope winds integrated along the eastern boundary of the North Atlantic, which agrees with the theory of poleward propagating coastal trapped waves. Our results give us confidence in the sea-level mass component from GRACE, satellite altimetry and the hydrographic stations over the Norwegian shelf. Moreover, they indicate that GRACE can be used to monitor and understand the intra-annual variability of the mass component of sea level in the coastal ocean, especially where in-situ measurements are sparse or absent.

Language: English

Type: info:eu-repo/semantics/conferenceObject

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Contribution of altimetry to the Gulf of Guinea climate resilience due to last decade sea level anomalies scenarios (2023)

Kemgang Ghomsi, F. ; Rouault, M. ; Raj, R. ; [et al.]

In: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

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Publication Date: 2023-06-22

Description: The Gulf of Guinea (GoG) reports high vulnerability to coastal flooding caused by relative or climate-induced sea level rise, which is an example of how coastal sea level changes remain poorly understood, in contrast to the global and regional average sea levels measured by satellite altimetry missions. The relationship between equatorial Atlantic Ocean variability and the 1° coastal band off the coast of the GoG is investigated at interannual time scales from 29 years from recent altimetric products in order to understand its mitigation to sea level rise in a region where there is no reliable tide gauges data. The study focuses on the (extreme) warm and cold events that occur in both the GoG and the Atlantic Ninos and links them to the well-known Benguela Ninos occurrences that occur off the coast of Angola and Namibia. A correlation between signals observed along the GoG with significant events depicted along the Angola-Namibian coastlines as the extraordinary Equatorial Atlantic Warming in 2010, 2012, and 2021 with the 2019 events depicted as the warmest in the last 40 years, which has never been reported in this region, using both altimetric monthly Sea Level Anomalies and Sea Surface Temperature Anomalies. Interannual SLA along the equatorial domain are systematically analyzed, and it is found that they advance the West African coastal ones by 1 month, supporting the idea that equatorial wave dynamics are responsible for their creation and the northward propagation observed on the SLA attributed mainly to the Kelvin coastal trapped waves.

Language: English

Type: info:eu-repo/semantics/conferenceObject

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Where and How the East Madagascar Current Retroflection Originates? (2021)

Ramanantsoa, Juliano D. ; Penven, P. ; Raj, R. P. ; [et al.]

AGU (American Geophysical Union) | Wiley

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Publication Date: 2024-02-07

Description: The East Madagascar Current (EMC) is one of the western boundary currents of the South Indian Ocean. As such, it plays an important role in the climate system by transporting water and heat toward the pole and recirculating to the large-scale Indian Ocean through retroflection modes of its southern extension. Five cruise data sets and remote sensing data from different sensors are used to identify three states of the southern extension of the EMC: early retroflection, canonical retroflection, and no retroflection. Retroflections occur 47% of the time. EMC strength regulates the retroflection state, although impinged mesoscale eddies also contribute to retroflection formation. Early retroflection is linked with EMC volume transport. Anticyclonic eddies drifting from the central Indian Ocean to the coast favor early retroflection formation, anticyclonic eddies near the southern tip of Madagascar promote the generation of canonical retroflection, and no retroflection appears to be associated with a lower eddy kinetic energy (EKE). Knowledge of the EMC retroflection state could help predict (a) coastal upwelling south of Madagascar, (b) the southeastern Madagascar phytoplankton bloom, and (c) the formation of the South Indian Ocean Counter Current (SICC).

Type: Article , PeerReviewed

Format: text

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