Abstract The Filchner‐Ronne Ice Shelf, fringing the southern Weddell Sea, is Antarctica's second largest ice shelf. At present, basal melt rates are low due to active dense water formation; however, model projections suggest a drastic increase in future enhanced inflow of open‐ocean warm water. Mooring observations from 2014 2016 along eastern flank Filchner Trough (76°S) revealed distinct seasonal cycle with if Warm Deep Water during summer and autumn. Here we present extended time series...

Abstract The Filchner‐Ronne Ice Shelf (FRIS) is characterized by moderate basal melt rates due to the near‐freezing waters that dominate wide southern Weddell Sea continental shelf. We revisited region in austral summer 2018 with detailed hydrographic and noble gas surveys along FRIS. FRIS front was High Salinity Water (HSSW) Ronne Depression, (ISW) on its eastern flank, an inflow of modified Warm Deep (mWDW) entering through Central Trough. Filchner Trough dominated HSSW‐sourced ISW, likely...

During 2023, record high, widespread sea surface temperature (SST) anomalies of up to 1.5 °C developed in the North Atlantic, with a core located eastern subtropics. In warming climate, extreme events like this are increasing frequency and intensity, having profound implications for marine life. The 2023 SST may have been driven by combination elements, such as weak winds, increased heat fluxes into ocean, basin-scale changes circulation transport. Yet, relative importance these...

Antarctic Bottom Water (AABW) is formed in select locations around the margin, filling bottom 40% of world’s ocean and circulating heat, carbon nutrients throughout all basins. Recent observations suggest that almost half AABW western Weddell Sea since 1992, its formation has decreased by 40%. A combination anthropogenic warming, through addition freshwater from melting glaciers ice shelves, natural climate variability, thought to have led this drastic decrease. The Interdecadal...

Abstract New 2 year long records from three moorings, located at S along the eastern flank and shelf of Filchner Trough, give insight in seasonal cycle hydrography to a region where Modified Warm Deep Water (MWDW) enters southern Weddell Sea continental shelf, possibly reaching Ronne Ice Shelf, biggest ice (by volume) Antarctica. A persistent northward flow Shelf (ISW) is found trough 400 m depth, while data on indicate cycle, characterized by four phases. distinct warm inflow period...

Abstract Marine heatwaves along the coast of Western Australia, referred to as Ningaloo Niño, have had dramatic impacts on ecosystem in recent decade. A number local and remote forcing mechanisms been put forward; however, little is known about depth structure such temperature extremes. Utilizing an eddy-active global ocean general circulation model, Niño corresponding cold Niña events are investigated between 1958 2016, with a focus their structure. The relative roles buoyancy wind inferred...

Abstract Rapid increases in upper 700‐m Indian Ocean heat content (IOHC) since the 2000s have focused attention on its role during recent global surface warming hiatus. Here, we use ocean model simulations to assess distinct multidecadal IOHC variations 1960s and explore relative contributions from wind stress buoyancy forcing regionally with depth. Multidecadal counteracted due 1990s. Wind contribute positively mid‐2000s, accounting for drastic change. Distinct timing structure of...

Marine Heatwaves (MHWs) are ocean extreme events, characterized by anomalously high temperatures, which can have significant ecological impacts. The Northeast U.S. continental shelf is of great economical importance as it home to a highly productive ecosystem. Local warming rates exceed the global average and region experienced multiple MHWs in last decade with severe consequences for regional fisheries. Due lack subsurface observations, depth-extent not well-known, hampers assessment...

The region of the Filchner Outflow System (FOS) in southeastern Weddell Sea is characterized by intensive and complex interactions different water masses. Dense Ice Shelf Water (ISW) emerging from beneath ice shelf cavities on continental shelf, meets Modified Warm Deep (MWDW) originating Antarctic Circumpolar Current at sill Trough. These hydrographic features convert FOS into an oceanographic key region, which may also show enhanced biological productivity corresponding aggregations marine...

The Northwest Atlantic, which has exhibited evidence of accelerated warming compared to the global ocean, also experienced several notable marine heatwaves (MHWs) over last decade. We analyze spatiotemporal patterns surface and subsurface temperature structure across Atlantic continental shelf slope assess influences atmospheric oceanic processes on ocean temperatures. Here we focus MHWs from 2015/16 examine their physical drivers using observational reanalysis products. find that a...

Abstract Rapid and regionally contrasting climate changes have been observed around Antarctica. However, our understanding of the impact these on ecosystems remains limited, there is an urgent need to better identify habitats Antarctic species. The Weddell seal ( Leptonychotes weddellii ) a circumpolar mesopredator indicative species marine communities. It has extensively studied in western Ross Sea East Antarctica, its ecology wintertime emerging. We documented behavioural response(s) four...

Shoreward intrusions of anomalously salty water along the continental shelf Middle Atlantic Bight are often observed in spring and summer. Exchange heat, nutrients, carbon across salinity-intrusion front has a significant impact on marine ecosystem fisheries. In this article, we developed method using an autonomous underwater vehicle (AUV) to detect track front's movement. Autonomous detection is based different vertical structures salinity two distinct types: difference large intruding...

Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Oceans. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]FRIS revisited 2018: On circulation water masses at Filchner Ronne Ice Shelves southern Weddell SeaAuthorsMarkusJanoutiDHartmut...

Abstract The Filchner Trough (FT) is a key site for exchange of water masses between the Weddell Sea continental shelf and deep ocean. Cold dense Ice Shelf Water (ISW), precursor Antarctic Bottom Water, flows north along FT overflows Sill. Although access warm to limited due presence Slope Front, southward transport facilitated through FT. We use moored current meters from Sill region show that monthly scale variability ISW overflow connected alongslope wind stress upstream. Periods with...

Climate variability and changes in sea ice dynamics have caused several ice-obligate or krill-dependent populations of marine predators to decline, eliciting concern about their demographic persistence the indirect ecological consequences that predator depletions may on ecosystems. Pack-ice seals are dominant Antarctic ecosystem, but there is considerable uncertainty abundance population trends. We modelled density distribution pack-ice as a function environmental covariates southern Weddell...

The Northeast U.S. continental shelf is a highly productive and economically important region that has experienced robust changes in upper-ocean properties recent decades. Warming rates exceed the global North Atlantic average particular several episodes of anomalously warm temperatures, so called marine heatwaves, have had devastating impacts on regional fisheries over past decade. There are also indicators salinification region, which might be linked to large-scale circulation as well...

The ocean is at the heart of our climate system and understanding its role as a driver modulator critical in times changing climate, posing serious threats to ecosystem societies. This increases need communicate science novel ways. Here we present outcomes, lessons-learned future plans artist-scientist collaborations part Synergy II project – collaboration between Art League Rhode Island Woods Hole Oceanographic Institution. Self-selected pairs scientists artists collaborate with...

The Northeast U.S. continental shelf is a highly productive and economically important region that has undergone substantial changes in recent years. Warming exceeds the global average several episodes of anomalously warm, sustained temperatures, so called marine heatwaves, have had profound impacts on regional fisheries. A majority research focused analysis temperature, however salinity can serve as valuable tracer well. With now more than decade remote-sensing sea surface data, we shed new...

Abstract The Northeast U.S. continental shelf (NEUS) is a highly productive and economically important region that has undergone substantial changes in recent years. Warming exceeds the global average several episodes of anomalously warm, sustained temperatures have had profound impacts on regional fisheries. A majority research studies focused analysis temperature; however, salinity can serve as valuable tracer well. With now more than decade remote‐sensing sea surface data, we shed new...