Dr Sam J Royston

BSc(Liv.), M.Sc(Manch.), PhD(Bristol)

  • BS8 1SS

20122020

Research output per year

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Personal profile

Research interests

I am a Research Associate at the University of Bristol within the Global Mass team (globalmass.eu). We are combining information about different contributions to sea-level variability in a Bayesian Hierarchical Model framework to better understand the sea-level budget at a local and regional scale. I am leading the Oceans work package, which uses tide gauge, satellite altimetry and steric sea surface data sets. Understanding the treatment of these data and in particular, the quantification of uncertainties, is imperative in gaining useful information on the components of sea-level variability. 

My PhD focused on investigating storm surge and tide forecasting and open ocean to coastal mean sea level variability using a variety of statistical and machine learning methods. I built on that work investigating sea level variability around Australia at the University of Tasmania. We used the characteristics of sea-level trend and residual noise to understand whether observed trends are emerging from the intrinsic noise. Our uncertainty estimates included best estimates of coloured noise and allowed for inter-annual and decadal natural variability (El Nino and the Pacific Decadal Oscillation). Also, I have used satellite altimetry data re-analysed for coastal regions to investigate the characteristics of sea level variability between open ocean and coastal locations.

I am interested is a range of earth science fields that contribute to sea-level change; ice sheet mass balance, geodesy, gravitational change, physical oceanography (dynamics, circulation changes, propogation of disturbances). During time spent at BAS, we replicated the dynamic response (speed up) of tributary glaciers following the collapse of Larsen A ice shelf. I also retain an interest in high frequency variability such as tides, oceanic waves and storm surge.   

External positions

Adjunct researcher, University of Tasmania, Australia

Structured keywords and research groupings

  • GlobalMass

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Projects

GlobalMass: Global ice and ocean mass trends

Bates, P. D., Bingham, R. J., Chuter, S. J., Hofer, S., Llovell, W., Martin Espanol, A., Rougier, J. C., Schumacher, M., Sha, Z., Westaway, R. M., Royston, S. J., Vishwakarma, B. D., Bamber, J. L., Brady, A., Ziegler, Y. & Abele, A. K.

1/08/1631/07/22

Project: Research

  • Research Output

    • 7 Article (Academic Journal)
    • 2 Conference Poster

    Can we resolve the basin-scale sea-level trend budget from GRACE ocean mass?

    Royston, S. J., Vishwakarma, B. D., Westaway, R. M., Rougier, J., Sha, Z. & Bamber, J. L., 9 Jan 2020, In : Journal of Geophysical Research: Oceans. 125, 1, 16 p., e2019JC015535.

    Research output: Contribution to journalArticle (Academic Journal)

    Open Access
    File
  • 100 Downloads (Pure)

    Sea level budgets should account for ocean bottom deformation

    Vishwakarma, B. D., Royston, S., Riva, R. E. M., Westaway, R. M. & Bamber, J. L., 16 Feb 2020, In : Geophysical Research Letters. 47, 3, 10 p., e2019GL086492.

    Research output: Contribution to journalArticle (Academic Journal)

    Open Access
    File
  • 46 Downloads (Pure)

    Using GRACE ocean mass to close the sea level budget at varying spatial scales

    Royston, S. J., Vishwakarma, B. D., Westaway, R. M., Rougier, J., Sha, Z. & Bamber, J. L., 13 Dec 2019.

    Research output: Contribution to conferenceConference Poster

    Open Access

    Activities

    • 3 Public talk, debate, discussion
    • 2 Community engagement, including convening focus/advisory groups

    A revised sea level budget equation to accurately represent physical processes driving sea level rise

    Bramha Dutt Vishwakarma (Speaker), , Sam J Royston (Contributor), , R. E. M. Riva (Contributor), , Richard M Westaway (Contributor), & Jonathan L Bamber (Contributor)

    4 May 2020

    Activity: Talk or presentation typesPublic talk, debate, discussion

    A first observation driven estimate of Ocean Bottom Deformation: updating the Sea Level Budget

    Richard Westaway (Contributor), , Bramha Dutt Vishwakarma (Speaker), , Sam Royston (Contributor), & Jonathan Bamber (Contributor)

    9 Apr 2019

    Activity: Talk or presentation typesPublic talk, debate, discussion

    How Informative is the Basin-Scale Sea-Level Budget?

    Sam Royston (Speaker), , Bramha Dutt Vishwakarma (Contributor), , Richard Westaway (Contributor), & Jonathan Bamber (Contributor)

    8 Apr 2019

    Activity: Talk or presentation typesCommunity engagement, including convening focus/advisory groups