Zobrazeno 1 - 10
of 555
pro vyhledávání: '"R, Ménard"'
Publikováno v:
Nonlinear Processes in Geophysics, Vol 30, Pp 375-398 (2023)
Accurate specification of the error statistics required for data assimilation remains an ongoing challenge, partly because their estimation is an underdetermined problem that requires statistical assumptions. Even with the common assumption that back
Externí odkaz:
https://doaj.org/article/274716b7d7384c3e8455e78864596981
Autor:
D. A. Kann, S. Agayeva, V. Aivazyan, S. Alishov, C. M. Andrade, S. Antier, A. Baransky, P. Bendjoya, Z. Benkhaldoun, S. Beradze, D. Berezin, M. Boër, E. Broens, S. Brunier, M. Bulla, O. Burkhonov, E. Burns, Y. Chen, Y. P. Chen, M. Conti, M. W. Coughlin, W. W. Cui, F. Daigne, B. Delaveau, H. A. R. Devillepoix, T. Dietrich, D. Dornic, F. Dubois, J.-G. Ducoin, E. Durand, P.-A. Duverne, H.-B. Eggenstein, S. Ehgamberdiev, A. Fouad, M. Freeberg, D. Froebrich, M. Y. Ge, S. Gervasoni, V. Godunova, P. Gokuldass, E. Gurbanov, D. W. Han, E. Hasanov, P. Hello, T. Hussenot-Desenonges, R. Inasaridze, A. Iskandar, N. Ismailov, A. Janati, T. Jegou du Laz, S. M. Jia, S. Karpov, A. Kaeouach, R. W. Kiendrebeogo, A. Klotz, R. Kneip, N. Kochiashvili, N. Kunert, A. Lekic, S. Leonini, C. K. Li, W. Li, X. B. Li, J. Y. Liao, L. Logie, F. J. Lu, J. Mao, D. Marchais, R. Ménard, D. Morris, R. Natsvlishvili, V. Nedora, K. Noonan, K. Noysena, N. B. Orange, P. T. H. Pang, H. W. Peng, C. Pellouin, J. Peloton, T. Pradier, O. Pyshna, Y. Rajabov, S. Rau, C. Rinner, J.-P. Rivet, F. D. Romanov, P. Rosi, V. A. Rupchandani, M. Serrau, A. Shokry, A. Simon, K. Smith, O. Sokoliuk, M. Soliman, L. M. Song, A. Takey, Y. Tillayev, L. M. Tinjaca Ramirez, I. Tosta e Melo, D. Turpin, A. de Ugarte Postigo, S. Vanaverbeke, V. Vasylenko, D. Vernet, Z. Vidadi, C. Wang, J. Wang, L. T. Wang, X. F. Wang, S. L. Xiong, Y. P. Xu, W. C. Xue, X. Zeng, S. N. Zhang, H. S. Zhao, X. F. Zhao
Publikováno v:
The Astrophysical Journal Letters, Vol 948, Iss 2, p L12 (2023)
Object GRB 221009A is the brightest gamma-ray burst (GRB) detected in more than 50 yr of study. In this paper, we present observations in the X-ray and optical domains obtained by the GRANDMA Collaboration and the Insight Collaboration. We study the
Externí odkaz:
https://doaj.org/article/5ebca5e7256647c995f697755b6c737d
Publikováno v:
Nonlinear Processes in Geophysics, Vol 28, Pp 1-22 (2021)
This contribution addresses the characterization of the model-error covariance matrix from the new theoretical perspective provided by the parametric Kalman filter method which approximates the covariance dynamics from the parametric evolution of a c
Externí odkaz:
https://doaj.org/article/edf5d84305d54046a8ac26966c694579
Publikováno v:
Nonlinear Processes in Geophysics, Vol 25, Pp 481-495 (2018)
The parametric Kalman filter (PKF) is a computationally efficient alternative method to the ensemble Kalman filter. The PKF relies on an approximation of the error covariance matrix by a covariance model with a space–time evolving set of parame
Externí odkaz:
https://doaj.org/article/489d892c7568433ca4d609a43acc6e9b
Autor:
Q. Errera, S. Ceccherini, Y. Christophe, S. Chabrillat, M. I. Hegglin, A. Lambert, R. Ménard, P. Raspollini, S. Skachko, M. van Weele, K. A. Walker
Publikováno v:
Atmospheric Measurement Techniques, Vol 9, Iss 12, Pp 5895-5909 (2016)
This paper discusses assimilation experiments of methane (CH4) and nitrous oxide (N2O) profiles retrieved from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS). Here we focus on data versions 6 and 7 provided by the ESA processor
Externí odkaz:
https://doaj.org/article/798668af1f59438cbe738cc737442f5e
Publikováno v:
Geoscientific Model Development, Vol 9, Iss 8, Pp 2893-2908 (2016)
We compare two optimized chemical data assimilation systems, one based on the ensemble Kalman filter (EnKF) and the other based on four-dimensional variational (4D-Var) data assimilation, using a comprehensive stratospheric chemistry transport model
Externí odkaz:
https://doaj.org/article/8af913cf1072406d8def7bc89c516209
Publikováno v:
Geoscientific Model Development, Vol 7, Iss 4, Pp 1451-1465 (2014)
An ensemble Kalman filter (EnKF) assimilation method is applied to the tracer transport using the same stratospheric transport model as in the four-dimensional variational (4D-Var) assimilation system BASCOE (Belgian Assimilation System for Chemical
Externí odkaz:
https://doaj.org/article/9ee06abce3e24f87ac37e4fc1c94bfba
Autor:
A. Robichaud, R. Ménard
Publikováno v:
Atmospheric Chemistry and Physics, Vol 14, Iss 4, Pp 1769-1800 (2014)
Multi-year objective analyses (OA) on a high spatiotemporal resolution for the warm season period (1 May to 31 October) for ground-level ozone and for fine particulate matter (diameter less than 2.5 microns (PM2.5)) are presented. The OA used in this
Externí odkaz:
https://doaj.org/article/f33cd7fa08844e4eab366d8c63dc5ca7
Publikováno v:
Atmospheric Chemistry and Physics, Vol 12, Iss 21, Pp 10015-10031 (2012)
The formulation of the background error covariances represented in the spectral space is discussed in the context of univariate assimilation relying on a grid point model, leaving out all the aspects of balances between the different control variable
Externí odkaz:
https://doaj.org/article/abd56aff8a504e38926a0946f66e8415
Publikováno v:
Natural Hazards and Earth System Sciences, Vol 12, Iss 5, Pp 1811-1821 (2012)
Natural hazards, due to climate change, are particularly damaging in urban areas because of interdependencies of their networks. So, urban resilience has to face up to climate risks. The most impacting phenomenon is the urban heat island (UHI) effect
Externí odkaz:
https://doaj.org/article/59332edd570c4a0a87a8219320aab4dd