scholarly journals Eddy generation and variability of the marginal ice zone in the Fram Strait according to satellite radar measurements

2021 ◽  
Vol 2057 (1) ◽  
pp. 012022
Author(s):  
L A Petrenko ◽  
I E Kozlov
Keyword(s):  
Synthetic Aperture ◽  
Spatial And Temporal Variability ◽  
Fram Strait ◽  
Marginal Ice Zone ◽  
Eddy Generation ◽  
Radar Measurements ◽  
Ice Edge ◽  
Satellite Radar ◽  
Edge Displacement ◽  
Ice Water

Abstract Based on analysis of spaceborne synthetic aperture data (SAR), acquired in summer of 2007 over Fram Strait and around Svalbard, we investigate spatial and temporal variability of the ice edge and generation of eddies in the marginal ice zone. During the season, the ice-water boundary nonuniformly moves along its entire length with the overall width of the ice edge displacement ranging from 30 to 220 km. The ice edge movement is often accompanied by generation of eddies and filaments peaking in August. Analysis of the data serves to find out over 2000 distinct MIZ eddies with a clear dominance of cyclones (78%). In July the detected eddies are predominantly formed along the ice edge, in August most of them are generated inside the MIZ, while in September their numbers along the ice edge and within the MIZ are similar. Larger eddies (10-20 km in diameter) are found over deep Fram Strait and the Greenland Sea shelf, while smaller eddies (~5 km) are observed in coastal regions around Svalbard.

scholarly journals Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in Winter

2021 ◽  
Vol 14 (1) ◽  
pp. 134
Author(s):  
Igor E. Kozlov ◽  
Oksana A. Atadzhanova
Keyword(s):  
Sea Ice ◽  
Fram Strait ◽  
Sar Images ◽  
Mean Values ◽  
Envisat Asar ◽  
Ice Melt ◽  
Ice Concentration ◽  
Marginal Ice Zone ◽  
Eddy Generation ◽  
Ice Edge

Here we investigate the intensity of eddy generation and their properties in the marginal ice zone (MIZ) regions of Fram Strait and around Svalbard using spaceborne synthetic aperture radar (SAR) data from Envisat ASAR and Sentinel-1 in winter 2007 and 2018. Analysis of 2039 SAR images allowed identifying 4619 eddy signatures. The number of eddies detected per image per kilometer of MIZ length is similar for both years. Submesoscale and small mesoscale eddies dominate with cyclones detected twice more frequently than anticyclones. Eddy diameters range from 1 to 68 km with mean values of 6 km and 12 km over shallow and deep water, respectively. Mean eddy size grows with increasing ice concentration in the MIZ, yet most eddies are detected at the ice edge and where the ice concentration is below 20%. The fraction of sea ice trapped in cyclones (53%) is slightly higher than that in anticyclones (48%). The amount of sea ice trapped by a single ‘mean’ eddy is about 40 km2, while the average horizontal retreat of the ice edge due to eddy-induced ice melt is about 0.2–0.5 km·d–1 ± 0.02 km·d–1. Relation of eddy occurrence to background currents and winds is also discussed.

Ice-Edge Eddies in the Fram Strait Marginal Ice Zone

Science ◽  
1987 ◽  
Vol 236 (4800) ◽  
pp. 427-429 ◽  
Author(s):  
O. M. JOHANNESSEN ◽  
J. A. JOHANNESSEN ◽  
E. SVENDSEN ◽  
R. A. SHUCHMAN ◽  
W. J. CAMPBELL ◽  
...  
Keyword(s):  
Fram Strait ◽  
Marginal Ice Zone ◽  
Ice Edge

SPRI participation in the Winter Marginal Ice Zone Experiment, MIZEX-87

Polar Record ◽  
1989 ◽  
Vol 25 (152) ◽  
pp. 33-36
Author(s):  
P. Rottier
Keyword(s):  
Ambient Noise ◽  
Fram Strait ◽  
Edge Region ◽  
Physical Processes ◽  
Marginal Ice Zone ◽  
Polar Research Institute ◽  
Important Field ◽  
Ice Edge ◽  
Research Institute

AbstractThis article outlines the Marginal Ice Zone Experiments (MIZEX), which began in 1983, and summarizes research investigations in Fram Strait during the most recent MIZEX of March and April 1987, involving members of the Scott Polar Research Institute (SPRI). An important field of investigation was ambient noise in the ice-edge region and the physical processes which produce it.

scholarly journals Brief Communication: Mesoscale and submesoscale dynamics in the marginal ice zone from sequential synthetic aperture radar observations

2020 ◽  
Vol 14 (9) ◽  
pp. 2941-2947 ◽  
Author(s):  
Igor E. Kozlov ◽  
Evgeny V. Plotnikov ◽  
Georgy E. Manucharyan
Keyword(s):  
Synthetic Aperture Radar ◽  
High Spatial Resolution ◽  
Velocity Fields ◽  
Synthetic Aperture ◽  
Fram Strait ◽  
Sar Images ◽  
Time Intervals ◽  
Marginal Ice Zone ◽  
Submesoscale Processes ◽  
Aperture Radar

Abstract. New possibilities for horizontal current retrieval in marginal ice zones (MIZs) from sequential Sentinel-1 synthetic aperture radar (SAR) images are demonstrated. Daily overlapping SAR acquisitions within 70–85∘ S/N at time intervals < 1 h enable estimation of high-resolution velocity fields, revealing MIZ dynamics down to submesoscales. An example taken from the Fram Strait MIZ reveals energetic eddies and filaments with Rossby numbers reaching O(1) magnitudes. The SAR-derived velocity estimations at such high spatial resolution can be critical for monitoring the evolving MIZ dynamics and model validation of submesoscale processes in polar oceans.

scholarly journals The Response of the Nordic Seas to Wintertime Sea-ice Retreat

2021 ◽  
pp. 1-40
Author(s):  
Yue Wu ◽  
David P. Stevens ◽  
Ian A. Renfrew ◽  
Xiaoming Zhai
Keyword(s):  
Global Warming ◽  
Sea Ice ◽  
Climate Model ◽  
Sea Temperature ◽  
Nordic Seas ◽  
Ocean Response ◽  
Marginal Ice Zone ◽  
Ice Retreat ◽  
Ice Edge ◽  
Sea Ice Retreat

AbstractThe ocean response to wintertime sea-ice retreat is investigated in the coupled climate model HiGEM. We focus on the marginal ice zone and adjacent waters of the Nordic Seas, where the air-sea temperature difference can be large during periods of off-ice winds promoting high heat flux events. Both control and transient climate model ensembles are examined, which allows us to isolate the ocean response due to sea-ice retreat from the response due to climate change. As the wintertime sea-ice edge retreats towards the Greenland coastline, it exposes waters that were previously covered by ice which enhances turbulent heat loss and mechanical mixing, leading to a greater loss of buoyancy and deeper vertical mixing in this location. However, under global warming, the buoyancy loss is inhibited as the atmosphere warms more rapidly than the ocean which reduces the air-sea temperature difference. This occurs most prominently further away from the retreating ice edge, over the Greenland Sea gyre. Over the gyre the upper ocean also warms significantly, resulting in a more stratified water column and, as a consequence, a reduction in the depth of convective mixing. In contrast, closer to the coast the effect of global warming is overshadowed by the effect of the sea-ice retreat, leading to significant changes in ocean temperature and salinity in the vicinity of the marginal ice zone.

scholarly journals Impact of a Fram Strait cyclone on ice edge, drift, divergence, and concentration: Possibilities and limits of an observational analysis

2008 ◽  
Vol 113 (C12) ◽  
Author(s):  
Burghard Brümmer ◽  
David Schröder ◽  
Gerd Müller ◽  
Gunnar Spreen ◽  
Annika Jahnke-Bornemann ◽  
...  
Keyword(s):  
Fram Strait ◽  
Observational Analysis ◽  
Ice Edge

Phytoplankton biomass and productivity in the marginal ice zone of the Fram Strait during summer 1984

1987 ◽  
Vol 92 (C7) ◽  
pp. 6777 ◽  
Author(s):  
Walker O. Smith ◽  
Marcus E. M. Baumann ◽  
David L. Wilson ◽  
Ludwig Aletsee
Keyword(s):  
Phytoplankton Biomass ◽  
Fram Strait ◽  
Marginal Ice Zone

Interpretation of synthetic aperture radar measurements of ocean currents

1983 ◽  
Vol 88 (C3) ◽  
pp. 1867 ◽  
Author(s):  
Clifford L. Rufenach ◽  
Robert A. Shuchman ◽  
David R. Lyzenga
Keyword(s):  
Synthetic Aperture Radar ◽  
Ocean Currents ◽  
Synthetic Aperture ◽  
Radar Measurements ◽  
Aperture Radar

Satellite altimetry of the Barents sea

2021 ◽  
pp. 194-212
Author(s):  
S.A. Lebedev ◽  
◽  
A.G. Kostianoy ◽  
S.K. Popov ◽  
◽  
...  
Keyword(s):  
Sea Level ◽  
Satellite Altimetry ◽  
Average Velocity ◽  
Barents Sea ◽  
Water Dynamics ◽  
Altimetry Data ◽  
The Barents Sea ◽  
Time Period ◽  
Ice Edge ◽  
Edge Displacement

Satellite altimetry data are used for investigation of the sea level variability and sea ice cover retreat in the Barents Sea in 1992−2018. The data from ERS−1/2, ENVISAT, SARAL/AltiKa, and Sentinel-3A/3B satellites were used in this study. An increasing trend of the sea level of about 2.31 mm/yr was observed in this time period, which caused a total increase in the Barents Sea level by about 6 cm. Linear trends of the sea level change varied from 1.84 mm/yr in July to 4.29 mm/yr in September. The average velocity of the ice edge retreat along the tracks in the northeastern direction is of 10.9 km/yr for the same period. It was found that the ice edge displacement rate tends to increase by 0.30 km/yr per a degree in longitude in the eastward direction. Thus, the ice edge retreat along the “eastern” tracks goes faster than along the “western” ones, which is likely explained by a change in the water dynamics in the Barents Sea.

Sign in / Sign up

Export Citation Format

Share Document