Results 31 to 40 of about 1,202,402 (151)

Data‐driven emulation of flow‐dependent background‐error variance in variational data assimilation

Quarterly Journal of the Royal Meteorological Society, EarlyView.
A machine‐learning approach is developed to emulate flow‐dependent background‐error variance within a variational data assimilation framework. The method reproduces uncertainty information that would normally require a 50‐member ensemble using only five members, while maintaining comparable observation fit and forecast performance.
Wei Pan, Massimo Bonavita, Marcin Chrust, Elías Hólm   +3 more
wiley   +1 more source

Magnetic local time dependency on cusp ion velocity dispersions in the mid-altitude cusp [PDF]

, 2001
Observations of cusp ion velocity dispersions made by the TIMAS instrument on the Polar spacecraft in the mid-altitude cusp during intervals of northward interplanetary magnetic field (IMF) reveal a clear ordering with magnetic local time (MLT).
Krauklis, I, Coates, AJ, Peterson, WK
core  

Balancing accuracy and speed: A multi‐fidelity ensemble Kalman filter with a machine learning surrogate model

Quarterly Journal of the Royal Meteorological Society, EarlyView.
We investigate the use of a multi‐fidelity ensemble Kalman filter (EnKF) in which the low‐fidelity model is a machine‐learning model, instead of a traditional low‐resolution model. Results with the Lorenz‐2005 and quasi‐geostrophic models show that we can achieve improved accuracy within the same computational budget compared with the standard EnKF ...
Jeffrey van der Voort, Martin Verlaan, Hanne Kekkonen   +2 more
wiley   +1 more source

Activities of the Summer Party of the 40th Japanese Antarctic Research Expedition in 1998-1999

Antarctic Record, 2001
The fortieth Japanese Antarctic Research Expedition (JARE-40) consisted of forty members of the wintering party and twenty members of the summer party with three visiting scientists (one from the United States of America and two from Australia), two ...
Kazuyuki Shiraishi
doaj   +1 more source

aurora-multiphysics/aurora: v0.3.0

, 2022
What's Changed Support openmc api changes by @helen-brooks in https://github.com/aurora-multiphysics/aurora/pull/14 Trigger CI automatically from forks by @helen-brooks in https://github.com/aurora-multiphysics/aurora/pull/15 Update input params by ...
helen-brooks, Patrick Shriwise
core   +1 more source

Unraveling the impact of dog‐friendly spaces on urban–wildland pumas and other wildlife

Wildlife Biology, EarlyView.
As the most widespread large carnivore on the planet, domestic dogs Canis lupus familiaris can pose a major threat to wildlife, even within protected areas (PAs). Growing human presence in PAs, coupled with increasing pet dog ownership underscores the urgency to understand the influence of dogs on wildlife activity and health.
Alys Granados, Zara McDonald, Katie McPherson, David Stoner   +3 more
wiley   +1 more source

An Early mid-Latitude Aurora Observed by Rozier (Beziers, 1780)

, 2020
Aurora observations are an uncommon phenomenon at low and mid latitudes that, at the end of the 18th century, were not well known and understood. Low and mid geomagnetic latitude aurora observations provide information about episodes of intense solar ...
Bertolin, Chiara, De Ferri, Lavinia, Dominguez-Castro, Fernando   +2 more
core  

Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications [PDF]

, 2010
The Antarctic Polar Front is an important biogeochemical divider in the Southern Ocean. Laminated diatom mat deposits record episodes of massive flux of the diatom Thalassiothrix antarctica beneath the Antarctic Polar Front and provide a marker for ...
Naveira Garabato, A.C., I. Grigorov, Grigorov, I., R.B. Pearce, Kemp, A.E.S., Pearce, Richard B., A.E.S. Kemp, A.C. Naveira Garabato   +7 more
core   +1 more source

Biology, ecology, and conservation of the Italian hare Lepus corsicanus: a review

Wildlife Biology, EarlyView.
The Italian hare Lepus corsicanus, an endemic lagomorph of Italy, serves as a critical case study in evolutionary biology and conservation. Once taxonomically debated, modern genetic and morphological analyses confirm its status as a distinct Pleistocene lineage restricted to the central‐southern Italian Peninsula and Sicily.
Pierangelo Freschi, Valter Trocchi
wiley   +1 more source

GOLD Observations of the Merging of the Southern Crest of the Equatorial Ionization Anomaly and Aurora During the 10 and 11 May 2024 Mother's Day Super Geomagnetic Storm

Geophysical Research Letters
Using NASA's Global‐scale Observations of the Limb and Disk (GOLD) imager, we report nightside ionospheric changes during the G5 super geomagnetic storm of 10 and 11 May 2024.
Deepak Kumar Karan, Carlos R. Martinis, Robert E. Daniell, Richard W. Eastes, Wenbin Wang, William E. McClintock, Robert G. Michell, Scott England   +7 more
doaj   +1 more source