Results 51 to 60 of about 21,726,964 (386)
The Onsager--Machlup functional for data assimilation [PDF]
, 2017 When taking the model error into account in data assimilation, one needs to evaluate the prior distribution represented by the Onsager--Machlup functional.
Sugiura, Nozomi
core +3 more sources
Remote Sensing, 2021 Satellite observations of brightness temperature from the Advanced Technology Microwave Sounder (ATMS) and Microwave Humidity Sounder (MHS) humidity sounding channels can provide relatively high horizontal resolution information about cloud and ...
Yanyang Hu, Xiaolei Zou
doaj +1 more source
Combining data assimilation and machine learning to emulate a dynamical model from sparse and noisy observations: a case study with the Lorenz 96 model [PDF]
Journal of Computer Science, 2019 . A novel method, based on the combination of data assimilation and machine learning is introduced. The new hybrid approach is designed for a two-fold scope: (i) emulating a hidden, possibly chaotic, dynamics and (ii) predicting its future states.
J. Brajard +3 more
semanticscholar +1 more source
Assimilating atmosphere reanalysis in coupled data assimilation [PDF]
Journal of Meteorological Research, 2016 This paper tests the idea of substituting the atmospheric observations with atmospheric reanalysis when setting up a coupled data assimilation system. The paper focuses on the quantification of the effects on the oceanic analysis resulted from this substitution and designs four different assimilation schemes for such a substitution.
Yun Liu +5 more
openaire +2 more sources
COSMIC-2 RO Profile Ending at PBL Top with Strong Vertical Gradient of Refractivity
Remote Sensing, 2022 The Formosa Satellite-7/Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (Satellite-7/COSMIC-2), which was successfully launched on 25 June 2019, provides dense radio occultation (RO) observations over the tropics and subtropics.
Xu Xu, Xiaolei Zou
doaj +1 more source
On sequential multiscale inversion and data assimilation [PDF]
, 2018 Multiscale approaches are very popular for example for solving partial differential equations and in many applied fields dealing with phenomena which take place on different levels of detail.
Nadeem, Aamir +2 more
core +1 more source
Advances in Meteorology, 2015 In this study, Observing System Simulation Experiments (OSSEs) are conducted to analyze the impact of assimilating surface sensitive infrared radiance observations over land and sea ice. This type of assimilation has not yet been successfully implemented
S. K. Dutta, L. Garand, S. Heilliette
doaj +1 more source
Data assimilation in the geosciences: An overview of methods, issues, and perspectives [PDF]
WIREs Climate Change, 2017 We commonly refer to state estimation theory in geosciences as data assimilation (DA). This term encompasses the entire sequence of operations that, starting from the observations of a system, and from additional statistical and dynamical information ...
A. Carrassi +3 more
semanticscholar +1 more source
Conditions for successful data assimilation [PDF]
Journal of Geophysical Research: Atmospheres, 2013 We show, using idealized models, that numerical data assimilation can be successful only if an effective dimension of the problem is not excessive. This effective dimension depends on the noise in the model and the data, and in physically reasonable problems, it can be moderate even when the number of variables is huge.
Matthias Morzfeld +3 more
openaire +6 more sources
Global 3D Features of Error Variances of GPS Radio Occultation and Radiosonde Observations
Remote Sensing, 2020 Global Positioning System (GPS) radio occultation (RO) and radiosonde (RS) observations are two major types of observations assimilated in numerical weather prediction (NWP) systems.
Xu Xu, Xiaolei Zou
doaj +1 more source