Lia Siegelman

Lia Siegelman
University of California, San Diego | UCSD · Scripps Institution of Oceanography (SIO)

PhD

About

26
Publications
10,096
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390
Citations
Citations since 2017
24 Research Items
390 Citations
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2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140

Publications

Publications (26)
Article
Full-text available
Satellite observations of the last two decades have led to a major breakthrough emphasizing the existence of a strongly energetic mesoscale turbulent eddy field in all the oceans. This ocean mesoscale turbulence is characterized by cyclonic and anticyclonic eddies (with a 100‐ to 300‐km size and depth scales of ∼500–1,000 m) that capture approximat...
Article
Full-text available
The ocean is the largest solar energy collector on Earth. The amount of heat it can store is modulated by its complex circulation, which spans a broad range of spatial scales, from metres to thousands of kilometres. In the classical paradigm, fine oceanic scales, less than 20 km in size, are thought to drive a significant downward heat transport fr...
Article
Full-text available
Submesoscale ocean processes, characterized by order one Rossby and Richardson numbers, are currently thought to be mainly confined to the ocean surface mixed layer, while the ocean interior is commonly assumed to be in quasi-geostrophic equilibrium. Here, a realistic numerical simulation in the Antarctic Circumpolar Current, with a 1/48° horizonta...
Article
Full-text available
Jupiter’s atmosphere is one of the most turbulent places in the solar system. Whereas observations of lightning and thunderstorms point to moist convection as a small-scale energy source for Jupiter’s large-scale vortices and zonal jets, this has never been demonstrated due to the coarse resolution of pre-Juno measurements. The Juno spacecraft disc...
Article
Full-text available
Significance Vortex crystals, geometric arrays of like-signed vortices, are observed in natural systems with vastly different space and time scales: at the poles of Jupiter (∼10,000-km radius and lifetime of at least 5 y) and in laboratory experiments with pure-electron plasma (∼3.5-cm radius, lifetime of about 1.7 s). We follow the adage “less is...
Article
Full-text available
Since 2017 the Juno spacecraft has observed a cyclone at the north pole of Jupiter surrounded by eight smaller cyclones arranged in a polygonal pattern. It is not clear why this configuration is so stable or how it is maintained. Here we use a time series of images obtained by the JIRAM mapping spectrometer on Juno to track the winds and measure th...
Article
Full-text available
Plain Language Summary Two classes of motions involving large vertical velocities are present in the upper ocean: Those associated with small‐scale fronts (<20 km, also called submesoscale or SBM fronts) and those associated with internal gravity waves (IGWs). SBM fronts are known to explain most of the vertical transport of heat, nutrients, and ma...
Article
Full-text available
GeophysicalFlows.jlis a Julia (Bezanson et al., 2017) package that contains partial differential equations solvers for a collection of geophysical fluid systems in periodic domains. All modules use Fourier-based pseudospectral numerical methods and leverage the framework pro-vided by the FourierFlows.jl (Constantinou et al., 2021) Julia package for...
Preprint
Full-text available
Jupiter’s atmosphere is one of the most turbulent places in the solar system. While lightning and thunderstorm observations point to moist convection as a small-scale energy source for Jupiter’s large-scale vortices and zonal jets, it has never been demonstrated due to the coarse resolution of pre-Juno measurements. Since 2017, the Juno spacecraft...
Preprint
Full-text available
From its unique pole-to-pole orbit, the Juno spacecraft discovered cyclones arranged in polygonal patterns around the poles of Jupiter. In a related modeling study the stability of the pattern depends on shielding -- a ring of anticyclonic vorticity surrounding each cyclone. Without shielding the vortices merge. Here we present high-resolution meas...
Article
Full-text available
Abstract Satellite altimeters provide global observations of sea surface height (SSH) and present a unique data set for advancing our theoretical understanding of upper‐ocean dynamics and monitoring its variability. Considering that mesoscale SSH patterns can evolve on timescales comparable to or shorter than satellite return periods, it is challen...
Article
Full-text available
L'océan est le plus grand réservoir d'énergie de notre planète. La quantité de chaleur qu'il est capable de stocker est modulée par sa circulation complexe, opérant sur des échelles allant du centimètre à la dizaine de milliers de kilomètres. Les découvertes scientifiques des deux dernières décennies ont révélé l'existence de fronts de fine échelle...
Article
Full-text available
The rate of ocean heat uptake depends on the mechanisms that transport heat between the surface and the ocean interior. A recent study found that the vertical heat transport driven by motions with scales smaller than 50 km (submesoscales) and frequencies smaller than one day⁻¹ is upward. This transport competes with the other major components of th...
Article
Full-text available
Recent studies demonstrate that energetic sub-mesoscale fronts (10–50 km width) extend in the ocean interior, driving large vertical velocities and associated fluxes. However, diagnosing the dynamics of these deep-reaching fronts from in situ observations remains challenging because of the lack of information on the 3-D structure of the horizontal...
Article
Full-text available
Submesoscale lenses of water with anomalous hydrographic properties have previously been observed in the East Australian Current (EAC) system, embedded within the thermocline of mesoscale anticyclonic eddies. The waters within these lenses have high oxygen content and temperature-salinity properties that signify a surface origin. However, it is not...
Thesis
Full-text available
L'océan est le plus grand réservoir d'énergie solaire de notre planète. La quantité de chaleur qu'il est capable de stocker est modulée par sa circulation complexe, opérant sur une vaste gamme d’échelles allant du centimètre à la dizaine de milliers de kilomètres. Cette thèse s'intéresse à deux types de processus océaniques: les tourbillons de méso...
Preprint
Full-text available
Satellite altimeters provide global observations of sea surface height (SSH) and present a unique dataset for advancing our theoretical understanding of upper ocean dynamics and monitoring its variability. Considering that mesoscale and submesoscale SSH patterns can evolve on timescales comparable to or shorter than satellite return periods, curren...
Article
Full-text available
Sub‐mesoscale fronts—with scales from 1 to 50 km are ubiquitous in satellite images of the world oceans. They are known to generate strong vertical velocities with significant impacts on biogeochemical fluxes and pelagic ecosystems. Here, we use a unique data set, combining high‐resolution behavioral and physical measurements, to determine the effe...
Article
Full-text available
Numerical studies indicate that interactions between ocean internal gravity waves (especially those <100 km) and geostrophic (or balanced) motions associated with mesoscale eddy turbulence (involving eddies of 100–300 km) impact the ocean’s kinetic energy budget and therefore its circulation. Results from these studies have never been confirmed by...
Article
Full-text available
The area west of the Kerguelen Islands (20–70°E/45–60°S) is characterized by a weak mesoscale activity except for a standing meander region of the Antarctic Circumpolar Current (ACC) localized between 20 and 40°E. A unique bio-physical dataset at high-resolution collected by a southern elephant seal (Mirounga leonina) reveals a conspicuous increase...
Article
Full-text available
Most available CTD–Satellite Relay Data Logger (CTD–SRDL) profiles are heavily compressed before satellite transmission. High-resolution profiles recorded at the sampling frequency of 0.5 Hz are however available upon physical retrieval of the logger. Between 2014 and 2018, several loggers deployed on elephant seals in the Southern Ocean have been...
Article
Full-text available
The effect of thermal mass on the salinity estimate from conductivity–temperature–depth (CTD) tags sensor mounted on marine mammals is documented, and a correction scheme is proposed to mitigate its impact. The algorithm developed here allows for a direct correction of the salinity data, rather than a correction of the sample’s conductivity and tem...
Article
Full-text available
The California Current System (CCS) is an eastern boundary current system with strong biological productivity largely due to seasonal wind‐driven upwelling and transport of the California Current (CC). Two independent, yet complementary time series, CalCOFI ichthyoplankton surveys and sampling of southern California power plant cooling‐water intake...
Article
Full-text available
The presence of a dense layer of organisms in the mesopelagic zone is a ubiquitous feature of the world oceans, and these organisms may constitute a major component of marine biomass worldwide. Many mesopelagic organisms perform light-dependent diel vertical migration. It has been hypothesised that extreme light regimes encountered at high latitude...

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