The Transient Sensitivity of Sea Level Rise

As we warm our planet, oceans expand, ice on land melts, and sea levels rise. On century time scales, we find that the sea level response to warming can be characterized by a single metric: the transient sea level sensitivity. Historical sea level exhibits substantially higher sensitivity than model-based estimates of future climates in authoritative climate assessments. Implying recent projections could well underestimate the likely sea level rise by the end of this century.

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Grinsted, A. and Christensen, J. H., (2021) The transient sensitivity of sea level rise, Ocean Sci., 17, 181–186, doi:10.5194/os-17-181-2021 Share

Normalized US hurricane damage estimates using area of total destruction, 1900−2018

We present an approach to normalize hurricane damage, where damage is framed in terms of an equivalent area of total destruction. This has some advantages over customary normalization schemes, and we demonstrate that our record has reduced variance and correlates marginally better with wind speeds and pressure. That is, it allows us to better address climatic trends. We find that hurricanes are indeed becoming more damaging. The frequency of the very most damaging hurricanes has increased 3 times per century.

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Normalized US hurricane damage estimates using area of total destruction, 1900−2018, Aslak Grinsted, Peter Ditlevsen and Jens Hesselbjerg Christensen, Proceedings of the National Academy of Sciences. doi:10.1073/pnas.1912277116 Share

Effect of an orientation-dependent nonlinear grain fluidity on bulk directional enhancement-factors

Ice with a strong fabric deforms more readily in some directions. Nicholas Rathmann levels up the theory with a better treatment of how grains influence bulk properties. The impact can be an order of magnitude difference in bulk enhancement factors.

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Rathmann, N., Hvidberg, C., Grinsted, A., Lilien, D., & Dahl-Jensen, D. (2021). Effect of an orientation-dependent non-linear grain fluidity on bulk directional enhancement factors. Journal of Glaciology, 1-7. doi:10.1017/jog.2020.117 Share

Surface velocity of the Northeast Greenland Ice Stream (NEGIS)

The Northeast Greenland Ice Stream (NEGIS) extends around 600 km from its onset in the interior of Greenland to the coast. Several maps of surface velocity and topography in Greenland exist, but accuracy is limited due to the lack of validation data. Here we present results from a 5-year GPS survey in an interior section of NEGIS. We use the data to assess a list of satellite-derived ice velocity and surface elevation products and discuss the implications for the ice stream flow in the area.

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Hvidberg, C. S., Grinsted, A., Dahl-Jensen, D., Khan, S. A., Kusk, A., Andersen, J. K., Neckel, N., Solgaard, A., Karlsson, N. B., Kjær, H. A., and Vallelonga, P., Surface velocity of the Northeast Greenland Ice Stream (NEGIS), assessment of interior velocities derived from satellite data by GPS, The Cryosphere, 14, 3487–3502, doi:10.5194/tc-14-3487-2020, 2020. Share

Hagen Bræ, A Surging Glacier in North Greenland — 35 Years of Observations

Improved ice velocity measurements with Sentinel-1 TOPS interferometry.

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Solgaard, A. M., Simonsen, S. B., Grinsted, A., Mottram, R., Karlsson, N. B., Hansen, K., ... & Sørensen, L. S. (2020). Hagen Bræ A Surging Glacier in North Greenland—35 Years of Observations. Geophysical Research Letters, 47(6), e2019GL085802. Share

Improved ice velocity measurements with Sentinel-1 TOPS interferometry

Improved ice velocity measurements with Sentinel-1 TOPS interferometry.

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Andersen, J. K., Kusk, A., Boncori, J. P. M., Hvidberg, C. S., & Grinsted, A. (2020). Improved ice velocity measurements with Sentinel-1 TOPS interferometry. Remote Sensing, 12(12), 2014. Share

East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat

Grains of dust in an ice core illustrate how fast a landscape is covered with ice after an ice age sets in.

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Simonsen, M.F., Baccolo, G., Blunier, T. et al. East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat. Nat Commun 10, 4494 (2019). doi:10.1038/s41467-019-12546-2 Share

Sea-level change in the Dutch Wadden Sea

A thorough report on the sea-level change in the Dutch Wadden Sea.

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Vermeersen, B. L. A., Slangen, A. B. A., Gerkema, T., Baart, F., Cohen, K. M., Dangendorf, S., Duran-Matute, M., Frederikse, T., Grinsted, A., Hijma, M. P., Jevrejeva, S., Kiden, P., Kleinherenbrink, M., Meijles, E. W., Palmer, M. D., Rietbroek, R., Riva, R. E. M., Schulz, E., Slobbe, D. C., ... van der Wegen, M. (2018). Sea-level change in the Dutch Wadden Sea. Netherlands journal of geosciences-Geologie en mijnbouw, 97(3), 79-127. doi:10.1017/njg.2018.7 Share

Influence of temperature fluctuations on equilibrium ice sheet volume.

Weather variability has a profound impact on the mass balance of ice sheets, and the equilibrium volume of ice sheets. We illustrate this in a simple ice sheet model and find that the equilibrium ice volume is ~1 m SLE smaller when the simple model is forced with fluctuating temperatures as opposed to a stable climate.

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Mikkelsen, T. B., Grinsted, A., and Ditlevsen, P., Influence of temperature fluctuations on equilibrium ice sheet volume, The Cryosphere, 12, 39–47, doi:10.5194/tc-12-39-2018, 2018. Share

Daily Glacier

dailyglacier is a twitter-bot that tweets images of a random glacier every day. This page is used to display additional metadata and maps from the bot. .cocoen { box-sizing: border-box; cursor: pointer; line-height: 0; margin: 0; overflow: hidden; padding: 0; position: relative; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none } .cocoen * { box-sizing: inherit } .cocoen ::after, .cocoen ::before { box-sizing: inherit } .cocoenimg, .cocoenpictureimg { display: block; width: 100% } .

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A workflow for video presentations

Video presentations are a powerful way of getting your science across to a wider audience. I recently published a scientific study on some very large Jökulhlaup in East Greenland. I wanted to have a video with the press release, but as our go to guy was on vacation I had to do it myself.

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Migrating to Hugo

This site is now created using a static site generator called hugo. I host it on netlify, and the source files are hosted on github. This is a nice setup for academics. So thumbs up from me.

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