Results 101 to 110 of about 21,732 (225)
Hamilton's principle for quasigeostrophic motion
, 1998 We show that the equation of quasigeostrophic (QG) potential vorticity conservation in geophysical fluid dynamics follows from Hamilton's principle for stationary variations of an action for geodesic motion in the f-plane case or its prolongation in the ...
Holm, Darryl D., Zeitlin, Vladimir
core +1 more source
Eddy Kinetic Energy Contribution to Total Ocean Kinetic Energy From Multi‐Satellite Altimetry
Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract Ocean mesoscale structures play a central role in transporting oceanic properties, accounting for a significant fraction of ocean's total kinetic energy (KE). Using 23 years of a novel multisatellite altimetric estimate, we assess the contribution of eddy kinetic energy (EKE), mean kinetic energy (MKE) and cross terms to the temporal mean and ...
Diego Cortés‐Morales +3 more
wiley +1 more source
Projected Changes of Mesoscale Eddy Activity in Subantarctic Mode Water Formation Regions
Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.Abstract Subantarctic Mode Water (SAMW) plays a vital role in the uptake of heat and carbon, thereby regulating global climate. Mesoscale eddies affect mode‐water subduction and transport in the Southern Ocean. However, it remains unclear how SAMW‐related eddy activity will evolve under anthropogenic warming, because most state‐of‐the‐art climate ...
Yushan Qu, Matthew H. England
wiley +1 more source
Comparative mesoscale eddy dynamics under geostrophic versus cyclogeostrophic balance from satellite altimetry [PDF]
Ocean ScienceThe curvature of streamlines plays a significant dynamical and structural role in meandering currents. At scales comparable to the deformation radius, the motion of eddies is governed by a balance between the pressure gradient force, the Coriolis force ...
X. Zhu +5 more
doaj +1 more source
Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.Abstract The El Niño–Southern Oscillation (ENSO) predictability has notably declined since the 1998–2013 global warming hiatus, challenging conventional sea surface temperature (SST)‐based forecast models. We identify sea surface salinity (SSS) as a critical yet underappreciated driver for restoring ENSO forecast skill post‐hiatus.
Jing Wang +3 more
wiley +1 more source
Nitrate Distribution in Pacific Winter Water Along the Northern Edge of the Chukchi Sea
Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.Abstract Nutrient‐rich, Pacific‐origin winter water (PWW) is a primary source of nitrate for the western Arctic Ocean, spurring primary production at the base of the food web. This cold water exits the Chukchi Sea shelf via Herald Canyon and Barrow Canyon, which feed the eastward‐flowing Chukchi Shelfbreak Jet (CSJ) and the westward‐flowing Chukchi ...
Yanxin Wang +2 more
wiley +1 more source
Quasi-geostrophic kinematic dynamos at low magnetic Prandtl number [PDF]
, 2004 Rapidly rotating spherical kinematic dynamos are computed using the combination of a quasi geostrophic (QG) model for the velocity field and a classical spectral 3D code for the magnetic field. On one hand, the QG flow is computed in the equatorial plane
Cardin, Philippe, Schaeffer, Nathanael
core +2 more sources
Improved polar geostrophic surface currents from satellite altimetry
, 2021 Surface ocean currents in polar regions can be monitored by satellite altimetry-derived geostrophic currents. However, they are characterized by an irregular and sparse data sampling. Therefore, novel methods like an unsupervised classification for detecting water areas within the sea ice area and a combination strategy based on a principal component ...
openaire +1 more source
Asymmetries in Anticyclone Catalyze Submesoscale Motions
Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.Abstract Oceanic mesoscale eddies are often asymmetric, exhibiting horizontal deformation and vertical tilt, yet the implications of these structural asymmetries for finer‐scale dynamics remain poorly understood. Based on a series of high‐resolution numerical experiments, we found that asymmetric anticyclones act as potent catalysts for submesoscale ...
Xianliang Wu, Hong Li, Fanghua Xu
wiley +1 more source
Journal of Marine Science and EngineeringThe study of submesoscale ageostrophic motion is crucial for enhancing our comprehension of ocean dynamics. This paper employs global sea surface velocity reanalysis data and mixed layer depth data to examine the factors influencing submesoscale ...
Zihao Peng, Shuwen Zhang
doaj +1 more source