@misc{BoeckmannRitterCappelletti2018, author = {B{\"o}ckmann, Christine and Ritter, Christoph and Cappelletti, David}, title = {Mathematical tool for a closure study of aerosol microphysical property retrieval using lidar and photometer data}, series = {IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium}, journal = {IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium}, publisher = {IEEE}, address = {New York}, isbn = {978-1-5386-7150-4}, issn = {2153-6996}, doi = {10.1109/IGARSS.2018.8518674}, pages = {5575 -- 5578}, year = {2018}, abstract = {We present a project combining lidar, photometer and particle counter data with a regularization software tool for a closure study of aerosol microphysical property retrieval. In a first step only lidar data are used to retrieve the particle size distribution (PSD). Secondly, photometer data are added, which results in a good consistency of the retrieved PSDs. Finally, those retrieved PSDs may be compared with the measured PSD from a particle counter. The data here were taken in Ny Alesund, Svalbard, as an example.}, language = {en} } @article{PornsawadSungcharoenBoeckmann2020, author = {Pornsawad, Pornsarp and Sungcharoen, Parada and B{\"o}ckmann, Christine}, title = {Convergence rate of the modified Landweber method for solving inverse potential problems}, series = {Mathematics : open access journal}, volume = {8}, journal = {Mathematics : open access journal}, number = {4}, publisher = {MDPI}, address = {Basel}, issn = {2227-7390}, doi = {10.3390/math8040608}, pages = {22}, year = {2020}, abstract = {In this paper, we present the convergence rate analysis of the modified Landweber method under logarithmic source condition for nonlinear ill-posed problems. The regularization parameter is chosen according to the discrepancy principle. The reconstructions of the shape of an unknown domain for an inverse potential problem by using the modified Landweber method are exhibited.}, language = {en} } @article{StaniforthWoodReich2006, author = {Staniforth, Andrew and Wood, Nigel and Reich, Sebastian}, title = {A time-staggered semi-Lagrangian discretization of the rotating shallow-water equations}, series = {Quarterly journal of the Royal Meteorological Society}, volume = {132}, journal = {Quarterly journal of the Royal Meteorological Society}, number = {621C}, publisher = {Wiley}, address = {Weinheim}, issn = {0035-9009}, doi = {10.1256/qj.06.30}, pages = {3107 -- 3116}, year = {2006}, abstract = {A time-staggered semi-Lagrangian discretization of the rotating shallow-water equations is proposed and analysed. Application of regularization to the geopotential field used in the momentum equations leads to an unconditionally stable scheme. The analysis, together with a fully nonlinear example application, suggests that this approach is a promising, efficient, and accurate alternative to traditional schemes.}, language = {en} } @article{PornsawadSapsakulBoeckmann2019, author = {Pornsawad, Pornsarp and Sapsakul, Nantawan and B{\"o}ckmann, Christine}, title = {A modified asymptotical regularization of nonlinear ill-posed problems}, series = {Mathematics}, volume = {7}, journal = {Mathematics}, edition = {5}, publisher = {MDPI}, address = {Basel, Schweiz}, issn = {2227-7390}, doi = {10.3390/math7050419}, pages = {19}, year = {2019}, abstract = {In this paper, we investigate the continuous version of modified iterative Runge-Kutta-type methods for nonlinear inverse ill-posed problems proposed in a previous work. The convergence analysis is proved under the tangential cone condition, a modified discrepancy principle, i.e., the stopping time T is a solution of ∥𝐹(𝑥𝛿(𝑇))-𝑦𝛿∥=𝜏𝛿+ for some 𝛿+>𝛿, and an appropriate source condition. We yield the optimal rate of convergence.}, language = {en} }