Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Ian Grooms"'
Autor:
Ian Grooms, Christopher Riedel
Publikováno v:
Remote Sensing, Vol 16, Iss 13, p 2377 (2024)
Ensemble Kalman filters are an efficient class of algorithms for large-scale ensemble data assimilation, but their performance is limited by their underlying Gaussian approximation. A two-step framework for ensemble data assimilation allows this appr
Externí odkaz:
https://doaj.org/article/26084ad1e2aa404f9c86ad6e30b16720
Autor:
Nora Loose, Gustavo M. Marques, Alistair Adcroft, Scott Bachman, Stephen M. Griffies, Ian Grooms, Robert W. Hallberg, Malte F. Jansen
Publikováno v:
Journal of Advances in Modeling Earth Systems, Vol 15, Iss 12, Pp n/a-n/a (2023)
Abstract There are two distinct parameterizations for the restratification effect of mesoscale eddies: the Greatbatch and Lamb (1990, GL90, https://journals.ametsoc.org/view/journals/phoc/20/10/1520-0485_1990_020_1634_opvmom_2_0_co_2.xml?tab_body=abs
Externí odkaz:
https://doaj.org/article/5ffd8289cc9b4648a62492271e4803d5
Publikováno v:
Geophysical Research Letters, Vol 50, Iss 13, Pp n/a-n/a (2023)
Abstract Air‐sea flux variability has contributions from both ocean and atmosphere at different spatio‐temporal scales. Atmospheric synoptic scales and the air‐sea turbulent heat flux that they drive are well represented in climate models, but
Externí odkaz:
https://doaj.org/article/ad8f97598b7d4afaab909372128915bc
Autor:
Ian Grooms
Publikováno v:
Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 75, Iss 1, Pp 145–158-145–158 (2023)
Wind direction observations are instrumental weather records that hold promise for improving historical weather reanalyses and extending them deeper into the past. Two methods are developed for assimilating wind direction observations. The first uses
Externí odkaz:
https://doaj.org/article/2c118a96e5794ba7825b25cb9c280f6a
Autor:
Ian Grooms
Publikováno v:
Fluids, Vol 7, Iss 8, p 276 (2022)
Flow configurations that maximize the instantaneous rate of conversion from potential to kinetic energy are sought using a combination of analytical and numerical methods. A hydrostatic model is briefly investigated, but the presence of unrealistic a
Externí odkaz:
https://doaj.org/article/3ed8f796f6a045118e3250c4021c02b3
Autor:
Ian Grooms, Gregor Robinson
Publikováno v:
PLoS ONE, Vol 16, Iss 3, p e0248266 (2021)
A hybrid particle ensemble Kalman filter is developed for problems with medium non-Gaussianity, i.e. problems where the prior is very non-Gaussian but the posterior is approximately Gaussian. Such situations arise, e.g., when nonlinear dynamics produ
Externí odkaz:
https://doaj.org/article/427fdf253dca40d687fece297eb409a3
Autor:
Ian Grooms, Louis-Philippe Nadeau
Publikováno v:
Fluids, Vol 1, Iss 4, p 34 (2016)
We investigate the effects of sea surface temperature (SST)-dependent wind stress on the wind-driven quasigeostrophic (QG) double gyre. The main effects are to reduce the strength of the circulation and to shift the inter-gyre jet to the south. The S
Externí odkaz:
https://doaj.org/article/ecd9504367594892b15f0ef5cb3b213f
Publikováno v:
Quarterly Journal of the Royal Meteorological Society. 149:1018-1037
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7f5a1409aab9b6eb002716da2896ad0
https://doi.org/10.1002/qj.4446
https://doi.org/10.1002/qj.4446
Imperfect models are often used for forecasting and state estimation of complex dynamical systems, typically by mapping a reference initial state into model phase space, making a forecast, and then mapping back to the reference space. In many cases t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::afeafe9b3b0143bf9a7ccee514fe21e4
https://doi.org/10.22541/essoar.167267823.30477534/v1
https://doi.org/10.22541/essoar.167267823.30477534/v1
Publikováno v:
Nonlinear Processes in Geophysics, Vol 28, Pp 565-583 (2021)
Localization is widely used in data assimilation schemes to mitigate the impact of sampling errors on ensemble-derived background error covariance matrices. Strongly coupled data assimilation allows observations in one component of a coupled model to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21cb82458045100b1088d6233566e07e
https://npg.copernicus.org/articles/28/565/2021/npg-28-565-2021.pdf
https://npg.copernicus.org/articles/28/565/2021/npg-28-565-2021.pdf