{"dp_type": "Dataset", "free_text": "Stratification"}
[{"awards": "2502192 Schulz, Kirstin", "bounds_geometry": ["POLYGON((-64 -63,-62 -63,-60 -63,-58 -63,-56 -63,-54 -63,-52 -63,-50 -63,-48 -63,-46 -63,-44 -63,-44 -63.5,-44 -64,-44 -64.5,-44 -65,-44 -65.5,-44 -66,-44 -66.5,-44 -67,-44 -67.5,-44 -68,-46 -68,-48 -68,-50 -68,-52 -68,-54 -68,-56 -68,-58 -68,-60 -68,-62 -68,-64 -68,-64 -67.5,-64 -67,-64 -66.5,-64 -66,-64 -65.5,-64 -65,-64 -64.5,-64 -64,-64 -63.5,-64 -63))"], "date_created": "Wed, 02 Sep 2026 00:00:00 GMT", "description": "This data set contains vertical profiles of ocean temperature, salinity, turbulence dissipation rates and bio-optical properties, obtained from the sea ice in the western Weddell Sea during an expedition with the research icebreaker RV Polarstern, February to April 2026. Data were obtained with a battery powered, internal recording uprising VMP250-IR (Rockland Scientific Inc., VMP hereafter), deployed at ice stations from the ship, covering depths of 80m to the sea ice interface.", "east": -44.0, "geometry": ["POINT(-54 -65.5)"], "keywords": "Antarctica; Cryosphere; Ocean Temperature; PS153; R/v Polarstern; Salinity; Stratification; Turbulence", "locations": "Antarctica", "north": -63.0, "nsf_funding_programs": "Antarctic Ocean and Atmospheric Sciences", "persons": "Schulz, Kirstin", "project_titles": "Dynamics of Ocean Turbulence above the Western Weddell Sea Continental Shelf, Antarctica", "projects": [{"proj_uid": "p0010539", "repository": "USAP-DC", "title": "Dynamics of Ocean Turbulence above the Western Weddell Sea Continental Shelf, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -68.0, "title": "Turbulence dissipation rates under sea ice from an uprising microstructure profiler in the western Weddell Sea", "uid": "602090", "west": -64.0}, {"awards": "2502192 Schulz, Kirstin", "bounds_geometry": ["POLYGON((-64 -63,-62 -63,-60 -63,-58 -63,-56 -63,-54 -63,-52 -63,-50 -63,-48 -63,-46 -63,-44 -63,-44 -63.5,-44 -64,-44 -64.5,-44 -65,-44 -65.5,-44 -66,-44 -66.5,-44 -67,-44 -67.5,-44 -68,-46 -68,-48 -68,-50 -68,-52 -68,-54 -68,-56 -68,-58 -68,-60 -68,-62 -68,-64 -68,-64 -67.5,-64 -67,-64 -66.5,-64 -66,-64 -65.5,-64 -65,-64 -64.5,-64 -64,-64 -63.5,-64 -63))"], "date_created": "Wed, 02 Sep 2026 00:00:00 GMT", "description": "This data set contains vertical profiles of ocean temperature, salinity, turbulence dissipation rates and bio-optical properties, obtained from the sea ice in the western Weddell Sea during an expedition with the research icebreaker RV Polarstern, February to April 2026. Data were obtained with a battery powered, internal recording free-falling VMP250-IR (Rockland Scientific Inc., VMP hereafter), deployed at helicopter stations and ice stations from the ship, down to depths of either 300~m or 500~m. ", "east": -44.0, "geometry": ["POINT(-54 -65.5)"], "keywords": "Antarctica; Cryosphere; Ocean Temperature; Salinity; Southern Ocean; Stratification; Turbulence; Weddell Sea", "locations": "Weddell Sea; Southern Ocean; Antarctica", "north": -63.0, "nsf_funding_programs": "Antarctic Ocean and Atmospheric Sciences", "persons": "Schulz, Kirstin", "project_titles": "Dynamics of Ocean Turbulence above the Western Weddell Sea Continental Shelf, Antarctica", "projects": [{"proj_uid": "p0010539", "repository": "USAP-DC", "title": "Dynamics of Ocean Turbulence above the Western Weddell Sea Continental Shelf, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -68.0, "title": "Turbulence dissipation rates under sea ice from a free-falling microstructure profiler in the western Weddell Sea", "uid": "602089", "west": -64.0}, {"awards": "0124014 Hall, Brenda", "bounds_geometry": ["POLYGON((163.053 -77.599,163.0741 -77.599,163.0952 -77.599,163.1163 -77.599,163.1374 -77.599,163.1585 -77.599,163.1796 -77.599,163.2007 -77.599,163.2218 -77.599,163.24290000000002 -77.599,163.264 -77.599,163.264 -77.60130000000001,163.264 -77.6036,163.264 -77.6059,163.264 -77.6082,163.264 -77.6105,163.264 -77.61280000000001,163.264 -77.6151,163.264 -77.6174,163.264 -77.6197,163.264 -77.622,163.24290000000002 -77.622,163.2218 -77.622,163.2007 -77.622,163.1796 -77.622,163.1585 -77.622,163.1374 -77.622,163.1163 -77.622,163.0952 -77.622,163.0741 -77.622,163.053 -77.622,163.053 -77.6197,163.053 -77.6174,163.053 -77.6151,163.053 -77.61280000000001,163.053 -77.6105,163.053 -77.6082,163.053 -77.6059,163.053 -77.6036,163.053 -77.60130000000001,163.053 -77.599))"], "date_created": "Wed, 09 Jul 2025 00:00:00 GMT", "description": "Physical and chemical properties of sediment cores from Lake Fryxell, Antarctica, provide a means of reconstructing past paleoenvironmental, water-level, and water-source changes over the last 60,000 years. This dataset includes stable isotope (O, C), radiocarbon, U-series, sedimentological, and loss-on-ignition data. The oxygen data relate primarily to water-source changes in the lake basin. Carbon (both stable and radioactive) isotopes are influenced heavily by lake stratification and depth of the photic zone. The data record surface level changes of Lake Fryxell over the past 60,000 years. In addition, the dated sediments constrain the Ross Sea ice sheet to east of (seaward of) the lake through that entire time. Finally, stable oxygen isotopes document water source changes switching from local alpine glacier meltwater to Ross Sea ice sheet meltwater and then back to local glacier meltwater.", "east": 163.264, "geometry": ["POINT(163.1585 -77.6105)"], "keywords": "Antarctica; Cryosphere; Dry Valleys; Lake Fryxell; Paleoclimate; Radiocarbon; Ross Ice Sheet; Ross Sea; Stable Isotopes; U", "locations": "Dry Valleys; Ross Ice Sheet; Ross Sea; Lake Fryxell; Antarctica", "north": -77.599, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hall, Brenda; Whittaker, Thomas", "project_titles": "Collaborative Research: Millennial-scale fluctuations of Dry Valleys lakes: Implications for regional climate variability and the interhemispheric (a)synchrony of climate change", "projects": [{"proj_uid": "p0010519", "repository": "USAP-DC", "title": "Collaborative Research: Millennial-scale fluctuations of Dry Valleys lakes: Implications for regional climate variability and the interhemispheric (a)synchrony of climate change"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.622, "title": "Lake Fryxell Sediment Core Data", "uid": "601955", "west": 163.053}, {"awards": "2021245 Li, Yun; 1643735 Li, Yun", "bounds_geometry": ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -61.8,180 -63.6,180 -65.4,180 -67.2,180 -69,180 -70.8,180 -72.6,180 -74.4,180 -76.2,180 -78,144 -78,108 -78,72 -78,36 -78,0 -78,-36 -78,-72 -78,-108 -78,-144 -78,-180 -78,-180 -76.2,-180 -74.4,-180 -72.6,-180 -70.8,-180 -69,-180 -67.2,-180 -65.4,-180 -63.6,-180 -61.8,-180 -60))"], "date_created": "Mon, 12 Dec 2022 00:00:00 GMT", "description": "Coastal Antarctic polynyas are regions with concentrated phytoplankton blooms, and therefore have important implications for marine ecosystems and the associated carbon cycles. Seasonal water-column stratification, regulated by sea ice, can modulate the exposure of phytoplankton to light and nutrients, and is one of the most important factors that control the duration and strength of algal blooms. Polynyas differ greatly in their stratification, thus are not equally productive in terms of phytoplankton biomass, nor equally vulnerable to the changes in regional climate. To date, most studies have been focusing on individual polynyas, yet a systematic assessment of stratification patterns across polynyas is still lacking. Therefore, we examined the spatial and seasonal variability of stratification in circum-Antarctic coastal polynyas. Using \u003e105 in situ hydrographic casts combined from the World Ocean Database (1970-2021) and the Marine Mammals Exploring the Oceans Pole to Pole Consortium Database (2004-2017), we constructed stratification seasonal climatology using 0-100 m Simpson Energy. Our results showed that stratification magnitude varies by a factor of 6 and its onset time displays 1-2 months difference across all the polynyas. In the presence of warmer water at depths, polynyas tend to develop stronger stratification than others. The spatial variations of stratification are negatively related to sea ice retreat rate and polynya size, indicative of distinct dynamics resulted from the interaction of sea ice melting, advection and water-column mixing.", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctic; Antarctica; Antarctic Coastal Polynyas; Polynya", "locations": "Antarctica; Antarctic; Antarctic Coastal Polynyas", "north": -60.0, "nsf_funding_programs": "Antarctic Integrated System Science", "persons": "Li, Yun; Shunk, Nathan; Zhang, Weifeng", "project_titles": "Collaborative Research: Polynyas in Coastal Antarctica (PICA): Linking Physical Dynamics to Biological Variability", "projects": [{"proj_uid": "p0010044", "repository": "USAP-DC", "title": "Collaborative Research: Polynyas in Coastal Antarctica (PICA): Linking Physical Dynamics to Biological Variability"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.0, "title": "Monthly Stratification Climatology (1978-2021) in Antarctic Coastal Polynyas", "uid": "601628", "west": -180.0}, {"awards": "1744835 Wagner, Till", "bounds_geometry": ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"], "date_created": "Tue, 18 Jan 2022 00:00:00 GMT", "description": "Because of difficulties in adequately simulating their breakup, large Antarctic icebergs to date have either not been represented in models or represented but with no breakup scheme such that they consistently survive too long and travel too far compared with observations. Here, we introduce a representation of iceberg fracturing using a breakup scheme based on the \u201cfootloose mechanism.\u201d We optimize the parameters of this breakup scheme by forcing the iceberg model with an ocean state estimate and comparing the modeled iceberg trajectories and areas with the Antarctic Iceberg Tracking Database. We show that including large icebergs and a representation of their breakup substantially affects the iceberg meltwater distribution, with implications for the circulation and stratification of the Southern Ocean.\r\n\r\nThis data link includes the model developed for the study, including a link to the forcing fields needed to replicate the model results. ", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctica; Footloose Mechanism; Iceberg Breakup; Iceberg Decay; Model; Southern Ocean", "locations": "Antarctica; Southern Ocean", "north": -60.0, "nsf_funding_programs": "Antarctic Ocean and Atmospheric Sciences; Antarctic Ocean and Atmospheric Sciences", "persons": "Wagner, Till", "project_titles": "Modeling Giant Icebergs and Their Decay", "projects": [{"proj_uid": "p0010290", "repository": "USAP-DC", "title": "Modeling Giant Icebergs and Their Decay"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Model of iceberg drift and decay including breakup", "uid": "601510", "west": -180.0}]
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| Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Bounds Geometry | Geometry | Selected | Visible |
|---|---|---|---|---|---|---|---|---|---|
|
Turbulence dissipation rates under sea ice from an uprising microstructure profiler in the western Weddell Sea
|
2502192 |
2026-09-02 | Schulz, Kirstin |
Dynamics of Ocean Turbulence above the Western Weddell Sea Continental Shelf, Antarctica |
This data set contains vertical profiles of ocean temperature, salinity, turbulence dissipation rates and bio-optical properties, obtained from the sea ice in the western Weddell Sea during an expedition with the research icebreaker RV Polarstern, February to April 2026. Data were obtained with a battery powered, internal recording uprising VMP250-IR (Rockland Scientific Inc., VMP hereafter), deployed at ice stations from the ship, covering depths of 80m to the sea ice interface. | ["POLYGON((-64 -63,-62 -63,-60 -63,-58 -63,-56 -63,-54 -63,-52 -63,-50 -63,-48 -63,-46 -63,-44 -63,-44 -63.5,-44 -64,-44 -64.5,-44 -65,-44 -65.5,-44 -66,-44 -66.5,-44 -67,-44 -67.5,-44 -68,-46 -68,-48 -68,-50 -68,-52 -68,-54 -68,-56 -68,-58 -68,-60 -68,-62 -68,-64 -68,-64 -67.5,-64 -67,-64 -66.5,-64 -66,-64 -65.5,-64 -65,-64 -64.5,-64 -64,-64 -63.5,-64 -63))"] | ["POINT(-54 -65.5)"] | false | false |
|
Turbulence dissipation rates under sea ice from a free-falling microstructure profiler in the western Weddell Sea
|
2502192 |
2026-09-02 | Schulz, Kirstin |
Dynamics of Ocean Turbulence above the Western Weddell Sea Continental Shelf, Antarctica |
This data set contains vertical profiles of ocean temperature, salinity, turbulence dissipation rates and bio-optical properties, obtained from the sea ice in the western Weddell Sea during an expedition with the research icebreaker RV Polarstern, February to April 2026. Data were obtained with a battery powered, internal recording free-falling VMP250-IR (Rockland Scientific Inc., VMP hereafter), deployed at helicopter stations and ice stations from the ship, down to depths of either 300~m or 500~m. | ["POLYGON((-64 -63,-62 -63,-60 -63,-58 -63,-56 -63,-54 -63,-52 -63,-50 -63,-48 -63,-46 -63,-44 -63,-44 -63.5,-44 -64,-44 -64.5,-44 -65,-44 -65.5,-44 -66,-44 -66.5,-44 -67,-44 -67.5,-44 -68,-46 -68,-48 -68,-50 -68,-52 -68,-54 -68,-56 -68,-58 -68,-60 -68,-62 -68,-64 -68,-64 -67.5,-64 -67,-64 -66.5,-64 -66,-64 -65.5,-64 -65,-64 -64.5,-64 -64,-64 -63.5,-64 -63))"] | ["POINT(-54 -65.5)"] | false | false |
|
Lake Fryxell Sediment Core Data
|
0124014 |
2025-07-09 | Hall, Brenda; Whittaker, Thomas |
Collaborative Research: Millennial-scale fluctuations of Dry Valleys lakes: Implications for regional climate variability and the interhemispheric (a)synchrony of climate change |
Physical and chemical properties of sediment cores from Lake Fryxell, Antarctica, provide a means of reconstructing past paleoenvironmental, water-level, and water-source changes over the last 60,000 years. This dataset includes stable isotope (O, C), radiocarbon, U-series, sedimentological, and loss-on-ignition data. The oxygen data relate primarily to water-source changes in the lake basin. Carbon (both stable and radioactive) isotopes are influenced heavily by lake stratification and depth of the photic zone. The data record surface level changes of Lake Fryxell over the past 60,000 years. In addition, the dated sediments constrain the Ross Sea ice sheet to east of (seaward of) the lake through that entire time. Finally, stable oxygen isotopes document water source changes switching from local alpine glacier meltwater to Ross Sea ice sheet meltwater and then back to local glacier meltwater. | ["POLYGON((163.053 -77.599,163.0741 -77.599,163.0952 -77.599,163.1163 -77.599,163.1374 -77.599,163.1585 -77.599,163.1796 -77.599,163.2007 -77.599,163.2218 -77.599,163.24290000000002 -77.599,163.264 -77.599,163.264 -77.60130000000001,163.264 -77.6036,163.264 -77.6059,163.264 -77.6082,163.264 -77.6105,163.264 -77.61280000000001,163.264 -77.6151,163.264 -77.6174,163.264 -77.6197,163.264 -77.622,163.24290000000002 -77.622,163.2218 -77.622,163.2007 -77.622,163.1796 -77.622,163.1585 -77.622,163.1374 -77.622,163.1163 -77.622,163.0952 -77.622,163.0741 -77.622,163.053 -77.622,163.053 -77.6197,163.053 -77.6174,163.053 -77.6151,163.053 -77.61280000000001,163.053 -77.6105,163.053 -77.6082,163.053 -77.6059,163.053 -77.6036,163.053 -77.60130000000001,163.053 -77.599))"] | ["POINT(163.1585 -77.6105)"] | false | false |
|
Monthly Stratification Climatology (1978-2021) in Antarctic Coastal Polynyas
|
2021245 1643735 |
2022-12-12 | Li, Yun; Shunk, Nathan; Zhang, Weifeng |
Collaborative Research: Polynyas in Coastal Antarctica (PICA): Linking Physical Dynamics to Biological Variability |
Coastal Antarctic polynyas are regions with concentrated phytoplankton blooms, and therefore have important implications for marine ecosystems and the associated carbon cycles. Seasonal water-column stratification, regulated by sea ice, can modulate the exposure of phytoplankton to light and nutrients, and is one of the most important factors that control the duration and strength of algal blooms. Polynyas differ greatly in their stratification, thus are not equally productive in terms of phytoplankton biomass, nor equally vulnerable to the changes in regional climate. To date, most studies have been focusing on individual polynyas, yet a systematic assessment of stratification patterns across polynyas is still lacking. Therefore, we examined the spatial and seasonal variability of stratification in circum-Antarctic coastal polynyas. Using >105 in situ hydrographic casts combined from the World Ocean Database (1970-2021) and the Marine Mammals Exploring the Oceans Pole to Pole Consortium Database (2004-2017), we constructed stratification seasonal climatology using 0-100 m Simpson Energy. Our results showed that stratification magnitude varies by a factor of 6 and its onset time displays 1-2 months difference across all the polynyas. In the presence of warmer water at depths, polynyas tend to develop stronger stratification than others. The spatial variations of stratification are negatively related to sea ice retreat rate and polynya size, indicative of distinct dynamics resulted from the interaction of sea ice melting, advection and water-column mixing. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -61.8,180 -63.6,180 -65.4,180 -67.2,180 -69,180 -70.8,180 -72.6,180 -74.4,180 -76.2,180 -78,144 -78,108 -78,72 -78,36 -78,0 -78,-36 -78,-72 -78,-108 -78,-144 -78,-180 -78,-180 -76.2,-180 -74.4,-180 -72.6,-180 -70.8,-180 -69,-180 -67.2,-180 -65.4,-180 -63.6,-180 -61.8,-180 -60))"] | ["POINT(0 -89.999)"] | false | false |
|
Model of iceberg drift and decay including breakup
|
1744835 |
2022-01-18 | Wagner, Till |
Modeling Giant Icebergs and Their Decay |
Because of difficulties in adequately simulating their breakup, large Antarctic icebergs to date have either not been represented in models or represented but with no breakup scheme such that they consistently survive too long and travel too far compared with observations. Here, we introduce a representation of iceberg fracturing using a breakup scheme based on the “footloose mechanism.” We optimize the parameters of this breakup scheme by forcing the iceberg model with an ocean state estimate and comparing the modeled iceberg trajectories and areas with the Antarctic Iceberg Tracking Database. We show that including large icebergs and a representation of their breakup substantially affects the iceberg meltwater distribution, with implications for the circulation and stratification of the Southern Ocean. This data link includes the model developed for the study, including a link to the forcing fields needed to replicate the model results. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] | ["POINT(0 -89.999)"] | false | false |
