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Your search keyword '"Kuhlbrodt, Till"' showing total 22 results
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22 results on '"Kuhlbrodt, Till"'

2. Supplementary material to "UKESM1.1: Development and evaluation of an updated configuration of the UK Earth System Model"

Author

Mulcahy, Jane Patricia, primary, Jones, Colin G., additional, Rumbold, Steven T., additional, Kuhlbrodt, Till, additional, Dittus, Andrea J., additional, Blockley, Edward W., additional, Yool, Andrew, additional, Walton, Jeremy, additional, Hardacre, Catherine, additional, Andrews, Timothy, additional, Bodas-Salcedo, Alejandro, additional, Stringer, Marc, additional, de Mora, Lee, additional, Harris, Phil, additional, Hill, Richard, additional, Kelley, Doug, additional, Robertson, Eddy, additional, and Tang, Yongming, additional

Published
2022
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3. UKESM1.1: Development and evaluation of an updated configuration of the UK Earth System Model

Author

Mulcahy, Jane Patricia, primary, Jones, Colin G., additional, Rumbold, Steven T., additional, Kuhlbrodt, Till, additional, Dittus, Andrea J., additional, Blockley, Edward W., additional, Yool, Andrew, additional, Walton, Jeremy, additional, Hardacre, Catherine, additional, Andrews, Timothy, additional, Bodas-Salcedo, Alejandro, additional, Stringer, Marc, additional, de Mora, Lee, additional, Harris, Phil, additional, Hill, Richard, additional, Kelley, Doug, additional, Robertson, Eddy, additional, and Tang, Yongming, additional

Published
2022
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5. Evaluating the physical and biogeochemical state of the global ocean component of UKESM1 in CMIP6 historical simulations

Author

Yool, Andrew, primary, Palmiéri, Julien, additional, Jones, Colin G., additional, de Mora, Lee, additional, Kuhlbrodt, Till, additional, Popova, Ekatarina E., additional, Nurser, A. J. George, additional, Hirschi, Joel, additional, Blaker, Adam T., additional, Coward, Andrew C., additional, Blockley, Edward W., additional, and Sellar, Alistair A., additional

Published
2021
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6. Evaluating the physical and biogeochemical state of the global ocean component of UKESM1 in CMIP6 historical simulations

Author

Yool, Andrew, Palmiéri, Julien, Jones, Colin G., De Mora, Lee, Kuhlbrodt, Till, Popova, Ekatarina E., Nurser, A. J. George, Hirschi, Joel, Blaker, Adam T., Coward, Andrew C., Blockley, Edward W., Sellar, Alistair A., Yool, Andrew, Palmiéri, Julien, Jones, Colin G., De Mora, Lee, Kuhlbrodt, Till, Popova, Ekatarina E., Nurser, A. J. George, Hirschi, Joel, Blaker, Adam T., Coward, Andrew C., Blockley, Edward W., and Sellar, Alistair A.

Abstract

The ocean plays a key role in modulating the climate of the Earth system (ES). At the present time it is also a major sink both for the carbon dioxide (CO2) released by human activities and for the excess heat driven by the resulting atmospheric greenhouse effect. Understanding the ocean's role in these processes is critical for model projections of future change and its potential impacts on human societies. A necessary first step in assessing the credibility of such future projections is an evaluation of their performance against the present state of the ocean. Here we use a range of observational fields to validate the physical and biogeochemical performance of the ocean component of UKESM1, a new Earth system model (ESM) for CMIP6 built upon the HadGEM3-GC3.1 physical climate model. Analysis focuses on the realism of the ocean's physical state and circulation, its key elemental cycles, and its marine productivity. UKESM1 generally performs well across a broad spectrum of properties, but it exhibits a number of notable biases. Physically, these include a global warm bias inherited from model spin-up, excess northern sea ice but insufficient southern sea ice and sluggish interior circulation. Biogeochemical biases found include shallow remineralization of sinking organic matter, excessive iron stress in regions such as the equatorial Pacific, and generally lower surface alkalinity that results in decreased surface and interior dissolved inorganic carbon (DIC) concentrations. The mechanisms driving these biases are explored to identify consequences for the behaviour of UKESM1 under future climate change scenarios and avenues for model improvement. Finally, across key biogeochemical properties, UKESM1 improves in performance relative to its CMIP5 precursor and performs well alongside its fellow members of the CMIP6 ensemble.

Published
2021
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8. Does lateral stirring really take place along neutral surfaces in double-diffusive regions of the oceans?

Author

Gabriel Wolf, Tailleux Remi, Kuhlbrodt Till, and Ferreira David

Abstract

Potential temperature/salinity (theta/S) characteristics of water masses in the ocean interior can often be traced back over long distances to their source regions. In practice, understanding how water masses are altered by interior mixing and stirring requires a detailed understanding of the interior pathways linking fluid parcels to their source regions. So far, oceanographers have generally assumed that these pathways are strongly constrained to take place on potential density surfaces of some kind, of which the most commonly employed have been the Jackett and McDougall neutral density variable and sigma2, the potential density referenced to 2000 dbar. Because sigma2 is a somewhat ad-hoc and artificial construct, the more physically-based neutral density variable has been widely assumed to represent the most accurate variable to describe interior pathways, but the analysis of van Sebille et al. (2011) intriguingly suggests otherwise. In order to shed light on the issue, this work hypothesizes that if neutral surfaces were optimal to describe lateral stirring in the ocean, they should be the surfaces along which the observed spread in potential temperature and salinity anomalies should be minimum, since lateral stirring is about 7 orders of magnitude more vigorous in the lateral directions than perpendicular to them. Surprisingly, it is found that this is actually never the case in ocean regions with positive density ratios, traditionally associated with double-diffusive regimes. In those regions, indeed, it is always possible to find material surfaces, not necessarily definable in terms of potential density, along which the spread is reduced for both potential temperature and salinity compared to that over neutral surfaces. In doubly-stable regions, on the other hand, it is not possible to find material variables able to simultaneously reduce both the spread in potential temperature and salinity compared to that over neutral surfaces. Given the widespread nature of double-diffusive regimes in the world oceans, especially in the Atlantic Ocean, these results have strong implications for the ability of ocean climate models to accurately simulate water masses, as it is unclear how to maintain water masses properties by mixing vigorously along directions along which the spread in theta/S is far from its minimum.

Published
2020

9. Supplementary material to "Evaluating the physical and biogeochemical state of the global ocean component of UKESM1 in CMIP6 Historical simulations"

Author

Yool, Andrew, primary, Palmiéri, Julien, additional, Jones, Colin G., additional, de Mora, Lee, additional, Kuhlbrodt, Till, additional, Popova, Ekatarina E., additional, Nurser, A. J. George, additional, Hirschi, Joel, additional, Blaker, Adam T., additional, Coward, Andrew C., additional, Blockley, Edward W., additional, and Sellar, Alistair A., additional

Published
2020
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10. Evaluating the physical and biogeochemical state of the global ocean component of UKESM1 in CMIP6 Historical simulations

Author

Yool, Andrew, primary, Palmiéri, Julien, additional, Jones, Colin G., additional, de Mora, Lee, additional, Kuhlbrodt, Till, additional, Popova, Ekatarina E., additional, Nurser, A. J. George, additional, Hirschi, Joel, additional, Blaker, Adam T., additional, Coward, Andrew C., additional, Blockley, Edward W., additional, and Sellar, Alistair A., additional

Published
2020
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16. Description of the resolution hierarchy of the global coupled HadGEM3-GC3.1 model as used in CMIP6 HighResMIP experiments

Author

Roberts, Malcolm J., primary, Baker, Alex, additional, Blockley, Ed W., additional, Calvert, Daley, additional, Coward, Andrew, additional, Hewitt, Helene T., additional, Jackson, Laura C., additional, Kuhlbrodt, Till, additional, Mathiot, Pierre, additional, Roberts, Christopher D., additional, Schiemann, Reinhard, additional, Seddon, Jon, additional, Vannière, Benoît, additional, and Vidale, Pier Luigi, additional

Published
2019
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19. UK Global Ocean GO6 and GO7: a traceable hierarchy of model resolutions

Author

Storkey, David, primary, Blaker, Adam T., additional, Mathiot, Pierre, additional, Megann, Alex, additional, Aksenov, Yevgeny, additional, Blockley, Edward W., additional, Calvert, Daley, additional, Graham, Tim, additional, Hewitt, Helene T., additional, Hyder, Patrick, additional, Kuhlbrodt, Till, additional, Rae, Jamie G. L., additional, and Sinha, Bablu, additional

Published
2018
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21. Supplementary material to "UK Global Ocean GO6 and GO7: a traceable hierarchy of model resolutions"

Author

Storkey, David, primary, Blaker, Adam T., additional, Mathiot, Pierre, additional, Megann, Alex, additional, Aksenov, Yevgeny, additional, Blockley, Edward W., additional, Calvert, Daley, additional, Graham, Tim, additional, Hewitt, Helene T., additional, Hyder, Patrick, additional, Kuhlbrodt, Till, additional, Rae, Jamie G. L., additional, and Sinha, Bablu, additional

Published
2018
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