Julien Brajard

Nov 11, 2024 | nature.com | Annalisa Bracco |Julien Brajard |Henk A. Dijkstra |Pedram Hassanzadeh |Christian Lessig

AbstractClimate science has been revolutionized by the combined effects of an exponential growth in computing power, which has enabled more sophisticated and higher-resolution simulations to be made of the climate system, and an exponential increase in observations since the first weather satellite was put in orbit.

Nov 7, 2023 | agupubs.onlinelibrary.wiley.com | Guangpeng Liu |Annalisa Bracco |Julien Brajard |Nansen Environmental

1 Introduction The application of machine learning (ML) algorithms to various aspects of weather and climate forecasting has received increasing attention over the past decade. In the weather arena, ML has been used in concert with output from numerical weather prediction models to improve forecasts (Chapman et al., 2019; Davò et al., 2016; Rasp & Lerch, 2018), predict extreme events (e.g., Chattopadhyay et al., 2020) or assess weather risk (McGovern et al., 2017).

Jul 20, 2023 | mdpi.com | Eric Machu |Julien Brajard |Daouda Diouf |Khassoum Correa

Abstract:The Sahara desert is a major global source of dust that is mostly transported southwest over the ocean off West Africa. The presence of this dust impacts the remote sensing of ocean surface properties. These aerosols have absorbing properties that are poorly accounted for in the standard ocean color data processing algorithm. This can result in an overestimation of the atmospheric contribution to the ocean color signal and consequently an underestimation of the oceanic contribution.

May 31, 2023 | journals.ametsoc.org | Julien Brajard |François Counillon |Yiguo Wang |Madlen Kimmritz

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Mar 9, 2023 | mdpi.com | Juan Cuesta |Julien Brajard |Farouk Lemmouchi |Mathieu Lachatre

1. IntroductionParticulate matter suspended in the air, known as aerosols, has a major impact on the environment. The scattering and absorption of radiation by aerosols (e.g., desert dust and black carbon) significantly alters the Earth’s radiative balance and consequently affects the climate system [1,2,3,4]. Aerosols are also the most important air pollutants and the greatest environmental threat to human health, causing more than 3 million premature deaths worldwide each year [5].