Integrated retrieval of sea-ice salinity, density, and thickness using polarimetric GNSS-R

Remote Sensing of Environment, Год журнала: 2025, Номер 318, С. 114617 - 114617

Опубликована: Янв. 26, 2025

Язык: Английский

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Increased Rotational Coupling Between Antarctic Sea Ice and the Atmosphere Over the Last 30 Years

Journal of Geophysical Research Oceans, Год журнала: 2025, Номер 130(2)

Опубликована: Фев. 1, 2025

Abstract Antarctic sea ice has been characterized by high temporal and spatial variability since the inception of reliable satellite records. The complex oceanic atmospheric mechanisms driving this present ongoing challenges in determining their respective contributions. We examine cyclonic anticyclonic rotation dynamics within overlying atmosphere at daily timescales from 1991 to 2020 using a new generation remote‐sensing product for sea‐ice drift. A two‐dimensional pattern similarity comparison between vorticity fields demonstrated noteworthy increase over past 3 decades, despite absence any discernible trends mean intensity either field. This escalating coupling suggests an increasing responsiveness forcing, phenomenon observed across all regions Southern Ocean. Notably, Weddell Sea experienced sharp decline its clockwise anticlockwise components 2002 onwards. increased drift synoptic scale with no forcing points plausible role ocean modifying rheology pack‐ice. Analysis southern annular mode (SAM) reveals winter correlation but not strengthening trend SAM is negligible. Our findings reiterate predominant ice, while highlighting knowledge gap on possibly influence under‐ice dynamics.

Язык: Английский

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Ecosystem-Based Fishery Management of Antarctic Krill (Euphausia superba) to Support Baleen Whales and other Predators Production Adapted for Potential Climate Change Effects

Journal of Plant and Animal Ecology, Год журнала: 2025, Номер 2(1), С. 51 - 61

Опубликована: Март 31, 2025

Antarctic krill is an important component of the zooplankton production in Southern Ocean and a major food source for baleen whales. The role commercial fishing predation by whales on Krill abundance has been investigated here using innovative ecosystem-based fishery management, EBFM which maintains to whale web ecosystem stability. literature indicates may have overfished, so it was reduced current annual upper limit 0.62 million tonnes support other predators krill, such as seals, penguins flying sea birds. However, recent suggests moderate reduction catch Peninsula area due its importance migration temperate areas. estimated be about 10% additional concerns climate change effects Ocean, reducing overall 0.556 tonnes, moderately higher than maximum taken 2022. Hence, biomass allow predators, giving full mortality similar that previously maintain Ocean.

Язык: Английский

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Global and regional drivers for exceptional climate extremes in 2023-2024: beyond the new normal

npj Climate and Atmospheric Science, Год журнала: 2025, Номер 8(1)

Опубликована: Апрель 7, 2025

Abstract Climate records have been broken with alarming regularity in recent years, but the events of 2023–2024 were exceptional even when accounting for climatic trends. Here we quantify these across multiple variables and show how excess energy accumulation Earth system drove conditions. Key factors positive decadal trend Earth’s Energy Imbalance (EEI), persistent La Niña conditions beginning 2020, switch to El Niño 2023. Between 2022 2023, heating from EEI was over 75% larger than during onset similar events. We further regional processes shaped distinct patterns record-breaking sea surface temperatures individual ocean basins. If is maintained, argue that natural fluctuations such as ENSO cycles will increasingly lead amplified, impacts, serving a glimpse future climate extremes.

Язык: Английский

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Pacific sub-decadal sea surface temperature variations contributed to recent Aantarctic Sea ice decline trend

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Апрель 9, 2025

Total sea ice extent (SIE) across the Southern Ocean increased from 1979-2014, but declined rapidly after 2016. Significant decline has emerged since peak of SIE in 2014, coincident with Pacific sub-decadal surface temperature (SST) trends resembling a strong La Niña-like cold condition and negative phase interdecadal oscillation (IPO). Previous studies suggest that warm subsurface was an important driver low spring 2016 sustained state since. Here we show observed atmospheric circulation changes near Antarctica during period June 2013-May 2023 are conducive to increasing via advection north reducing Antarctic SIE, involving deepening Amundsen Sea Low anomalous high pressures over Weddell West sectors. Through coupled pacemaker experiments, demonstrate SST have dominantly driven these through tropical-polar teleconnections also induced significant warming recent decade. The consequent decreasing enhanced effect significantly contributed rapid decline.

Язык: Английский

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Detection of multi-year ex-fast ice in the Weddell Sea, Antarctica, using ICESat-2 satellite altimeter data

Remote Sensing of Environment, Год журнала: 2025, Номер 325, С. 114750 - 114750

Опубликована: Апрель 24, 2025

Язык: Английский

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Southern Ocean Carbon Export Revealed by Backscatter and Oxygen Measurements From BGC‐Argo Floats

Global Biogeochemical Cycles, Год журнала: 2025, Номер 39(4)

Опубликована: Апрель 1, 2025

Abstract The Southern Ocean (south of 30°S) contributes significantly to global ocean carbon uptake through the solubility, physical and biological pumps. Many studies have estimated export deep ocean, but very few attempted a basin‐scale perspective, or accounted for sea‐ice zone (SIZ). In this study, we use an extensive array BGC‐Argo floats improve previous estimates across basins frontal zones, specifically including SIZ. Using new method involving changes in particulate organic dissolved oxygen along mesopelagic layer, find that total from 2014 2022 is 2.69 ± 1.23 PgC y −1 . polar Antarctic most (41%) with 1.09 0.46 Conversely, SIZ least (8%) 0.21 0.09 displays strong shallow respiration upper 200 m. However, contribution can increase up 14% depending on depth range investigated. We also consider vertical turbulent fluxes, which be neglected at are important near surface. Our work provides complementary approach relevant focuses evaluating biogeochemical impacts extent. Refining understanding its drivers ultimately our comprehension climate variability scale.

Язык: Английский

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El Niño was a key driver of anomalous ocean warming in Southeast Asia in 2023

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Май 8, 2025

Abstract In 2023, global ocean heat content reached unprecedented values since records began in 1960. The translation of into regional and local-scale warming remains poorly understood because limited observational data, particularly within Southeast Asia. Here, we investigate the 2023 event Asia using near-continuous 41-month in-situ temperature observations from Singapore Strait, satellite sea surface (SST) measurements, high-resolution reanalysis products. We document anomalous across Strait surrounding South China Sea Indonesian Seas to depths at least 40 m. Peak SSTs 1.8 °C above climatological mean were recorded central Sunda Shelf November for first time > years. Concurrent freshening was observed, with average salinity below October December. identify a southward migration warm anomalies beginning onset El Niño July near Luzon Strait. This occurred alongside shifts sea-level pressure near-surface currents region. attribute these shift North Equatorial Current bifurcation latitude, which permitted intrusion Pacific western boundary seas. Compared oceanic drivers, atmospheric forcings played role driving 2023. Our study highlights as key driver emphasises need expanded continuous, monitoring enhance understanding evolving ocean-atmosphere dynamics impacts under climate.

Язык: Английский

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The foraging distribution and habitat use of chick-rearing snow petrels from two colonies in Dronning Maud Land, Antarctica

Marine Biology, Год журнала: 2025, Номер 172(7)

Опубликована: Июнь 5, 2025

Язык: Английский

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Thermodynamic and Dynamic Variations in Sea Ice Thickness of the Ross Sea, Antarctica, Driven by Atmospheric Circulation

Journal of Geophysical Research Oceans, Год журнала: 2024, Номер 129(10)

Опубликована: Окт. 1, 2024

Abstract Atmospheric circulation has significant impacts on sea ice drifting patterns and mass balance, as wind drag induces pressure ridges leads the surface. In this study, spatiotemporal distributions of these dynamic deformation features in Ross Sea are examined using ICESat‐2 (IS2) ATL10 freeboard data (2019–2022). The temporal variation modal thickness (SIT), caused by thermodynamic growth advection, varies from 0.7–1.0 m April to 1.0–1.6 July–September decreases thereafter northwest (NW) northeast (NE) sectors. This SIT agrees with air temperature (correlation coefficients >0.5). southwest (SW) sector shows a consistently low (<1.0 m) because production new polynyas continuous northward drift. Meanwhile, southeast (SE) thickest Octobers 2019 2020 advection thick Amundsen Sea, which was reduced 2021 2022. terms deformation, SE largest wind‐driven convergence movement. However, such intense diminished 2022 due dominance strong southerly associated Low (ASL). study emphasizes potential IS2 products assess role atmospheric driving forces changes.

Язык: Английский

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