Ice Production in Ross Ice Shelf Polynyas during 2017-2018 from Sentinel-1 SAR Images

High sea ice production (SIP) generates high-salinity water, thus, influencing the global thermohaline circulation. Estimation from passive microwave data and heat flux models have indicated that the Ross Ice Shelf polynya (RISP) may be the highest SIP region in the Southern Oceans. However, the coarse spatial resolution of passive microwave data limited the accuracy of these estimates. The Sentinel-1 Synthetic Aperture Radar dataset with high spatial and temporal resolution provides an unprecedented opportunity to more accurately distinguish both polynya area/extent and occurrence. In this study, the SIPs of RISP and McMurdo Sound polynya (MSP) from 1 March–30 November 2017 and 2018 are calculated based on Sentinel-1 SAR data (for area/extent) and AMSR2 data (for ice thickness). The results show that the wind-driven polynyas in these two years occurred from the middle of March to the middle of November, and the occurrence frequency in 2017 was 90, less than 114 in 2018. However, the annual mean cumulative SIP area and volume in 2017 were similar to (or slightly larger than) those in 2018. The average annual cumulative polynya area and ice volume of these two years were 1,040,213 km2 and 184 km3 for the RSIP, and 90,505 km2 and 16 km3 for the MSP, respectively. This annual cumulative SIP (volume) is only 1/3–2/3 of those obtained using the previous methods, implying that ice production in the Ross Sea might have been significantly overestimated in the past and deserves further investigations.

[1]  D. Bromwich,et al.  Katabatic wind forcing of the Terra Nova Bay polynya , 1984 .

[2]  D. Bromwich,et al.  Hemispheric atmospheric variations and oceanographic impacts associated with katabatic surges across the Ross ice shelf, Antarctica , 1993 .

[3]  S. Grossmann,et al.  Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica , 1994, Applied and environmental microbiology.

[4]  J. Toggweiler,et al.  Effect of Sea Ice on the Salinity of Antarctic Bottom Waters , 1995 .

[5]  Gregory C. Johnson,et al.  Circulation, mixing, and production of Antarctic Bottom Water , 1999 .

[6]  T. Markus,et al.  ERS SAR characterization of coastal polynyas in the Arctic and comparison with SSM/I and numerical model investigations , 2002 .

[7]  Seelye Martin,et al.  Observations of ice thickness and frazil ice in the St. Lawrence Island polynya from satellite imagery, upward looking sonar, and salinity/temperature moorings , 2003 .

[8]  J. Wilkinson,et al.  A salt flux model for salinity change through ice production in the Greenland Sea, and its relationship to winter convection , 2003 .

[9]  K. Arrigo,et al.  Phytoplankton dynamics within 37 Antarctic coastal polynya systems , 2003 .

[10]  N. Kimura,et al.  Increase and decrease of sea ice area in the Sea of Okhotsk: Ice production in coastal polynyas and dynamic thickening in convergence zones , 2004 .

[11]  K. Assmann,et al.  Amundsen Sea ice production and transport , 2005 .

[12]  Flavio Parmiggiani,et al.  Fluctuations of Terra Nova Bay polynya as observed by active (ASAR) and passive (AMSR‐E) microwave radiometers , 2006 .

[13]  Ron Kwok,et al.  The areas and ice production of the western and central Ross Sea polynyas, 1992–2002, and their relation to the B-15 and C-19 iceberg events of 2000 and 2002 , 2007 .

[14]  Ron Kwok,et al.  Ross Sea polynyas: Response of ice concentration retrievals to large areas of thin ice , 2007 .

[15]  R. Galley,et al.  On the link between SAR‐derived sea ice melt and development of the summer upper ocean mixed layer in the North Open Water Polynya , 2007 .

[16]  Takeshi Tamura,et al.  Mapping of sea ice production for Antarctic coastal polynyas , 2008 .

[17]  Giorgio Budillon,et al.  Surface heat fluxes and thermohaline variability in the Ross Sea and in Terra Nova Bay polynya , 2009 .

[18]  T. Tamura,et al.  Modeling sea ice production and dense shelf water formation in coastal polynyas around East Antarctica , 2010 .

[19]  Ron Kwok,et al.  Sea ice production and export from coastal polynyas in the Weddell and Ross Seas , 2011 .

[20]  C. Haas,et al.  Sea ice production and water mass modification in the eastern Laptev Sea , 2011 .

[21]  T. Tamura,et al.  Mapping of sea ice production in the Arctic coastal polynyas , 2011 .

[22]  F. Parmiggiani,et al.  Multi-year measurement of Terra Nova Bay winter polynya extents , 2011 .

[23]  Ron Kwok,et al.  Variability and trends in sea ice extent and ice production in the Ross Sea , 2011 .

[24]  Luca Pietranera,et al.  Observations of the Terra Nova Bay (Antarctica) polynya by MODIS ice surface temperature imagery from 2005 to 2010 , 2012 .

[25]  T. Tamura,et al.  Potential regime shift in decreased sea ice production after the Mertz Glacier calving , 2012, Nature Communications.

[26]  Christian Haas,et al.  Airborne thickness and freeboard measurements over the McMurdo Ice Shelf, Antarctica, and implications for ice density , 2013 .

[27]  Luca Pietranera,et al.  High resolution observations of the Terra Nova Bay polynya using COSMO-SkyMed X-SAR and other satellite imagery , 2013 .

[28]  Michael L. Van Woert,et al.  Winter Atmospheric Forcing of the Ross Sea Polynya , 2013 .

[29]  Takeshi Tamura,et al.  Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya , 2013 .

[30]  H. Jay Zwally,et al.  Antarctic Offshore Leads and Polynyas and Oceanographic Effects , 2013 .

[31]  Malcolm Davidson,et al.  CryoSat‐2 estimates of Arctic sea ice thickness and volume , 2013 .

[32]  K. Ohshima,et al.  Long-term variation in sea ice production and its relation to the intermediate water in the Sea of Okhotsk , 2014 .

[33]  T. Tamura,et al.  Antarctic Bottom Water production from the Vincennes Bay Polynya, East Antarctica , 2014 .

[34]  Takeshi Tamura,et al.  Improved mapping of sea ice production in the Arctic Ocean using AMSR‐E thin ice thickness algorithm , 2014 .

[35]  D. Price,et al.  The sub-ice platelet layer and its influence on freeboard to thickness conversion of Antarctic sea ice , 2014 .

[36]  Flavio Parmiggiani,et al.  Automatic Measurement of Polynya Area by Anisotropic Filtering and Markov Random Fields , 2014, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[37]  Takeshi Tamura,et al.  Sea ice production variability in Antarctic coastal polynyas , 2015 .

[38]  Sascha Willmes,et al.  Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery , 2015 .

[39]  Sascha Willmes,et al.  Spatial Feature Reconstruction of Cloud-Covered Areas in Daily MODIS Composites , 2015, Remote. Sens..

[40]  Sascha Willmes,et al.  Pan-Arctic lead detection from MODIS thermal infrared imagery , 2015, Annals of Glaciology.

[41]  Wolfgang Dierking,et al.  Dynamics of the Terra Nova Bay Polynya: The potential of multi-sensor satellite observations , 2016 .

[42]  Sascha Willmes,et al.  Circumpolar polynya regions and ice production in the Arctic: results from MODIS thermal infrared imagery from 2002/2003 to 2014/2015 with a regional focus on the Laptev Sea , 2016 .

[43]  Giuseppe Aulicino,et al.  Modelling sea ice formation in the Terra Nova Bay polynya , 2017 .

[44]  K. Ohshima,et al.  Sea-ice production in the northern Japan Sea , 2017 .

[45]  K. Ohshima,et al.  Observations of frazil ice formation and upward sediment transport in the Sea of Okhotsk: A possible mechanism of iron supply to sea ice , 2017 .

[46]  Sohey Nihashi,et al.  Sea-Ice Production in Antarctic Coastal Polynyas Estimated From AMSR2 Data and Its Validation Using AMSR-E and SSM/I-SSMIS Data , 2017, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

[47]  Giuseppe Aulicino,et al.  A New Approach for Monitoring the Terra Nova Bay Polynya through MODIS Ice Surface Temperature Imagery and Its Validation during 2010 and 2011 Winter Seasons , 2018, Remote. Sens..

[48]  H. Xie,et al.  Spatio-temporal variability of Antarctic sea-ice thickness and volume obtained from ICESat data using an innovative algorithm , 2018, Remote Sensing of Environment.

[49]  Hongjie Xie,et al.  Assessing three waveform retrackers on sea ice freeboard retrieval from Cryosat-2 using Operation IceBridge Airborne altimetry datasets , 2018 .

[50]  Alfred Stein,et al.  Heat Flux Sources Analysis to the Ross Ice Shelf Polynya Ice Production Time Series and the Impact of Wind Forcing , 2019, Remote. Sens..

[51]  Frank Kauker,et al.  The 2018 North Greenland polynya observed by a newly introduced merged optical and passive microwave sea-ice concentration dataset , 2019, The Cryosphere.

[52]  S. Ackley,et al.  Sea-ice production and air/ice/ocean/biogeochemistry interactions in the Ross Sea during the PIPERS 2017 autumn field campaign , 2020, Annals of Glaciology.