Multi-scale observations of the co-evolution of sea ice thermophysical properties and microwave brightness temperatures during the summer melt period in Hudson Bay

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dc.contributor.authorHarasyn, Madison
dc.contributor.authorIsleifson, Dustin
dc.contributor.authorChan, Wayne
dc.contributor.authorBarber, David
dc.date.accessioned2020-08-17T21:46:42Z
dc.date.available2020-08-17T21:46:42Z
dc.date.issued2020-04-23
dc.date.submitted2020-08-17T21:46:42Zen_US
dc.description.abstractMonitoring the trend of sea ice breakup and formation in Hudson Bay is vital for maritime operations, such as local hunting or shipping, particularly in response to the lengthening of the ice-free period in the Bay driven by climate change. Satellite passive microwave sea ice concentration products are commonly used for large-scale sea ice monitoring and predictive modelling; however, these product algorithms are known to underperform during the summer melt period due to the changes in sea ice thermophysical properties. This study investigates the evolution of in situ and satellite-retrieved brightness temperature (TB ) throughout the melt season using a combination of in situ passive microwave measurements, thermophysical sampling, unmanned aerial vehicle (UAV) surveys, and satellite-retrieved TB. In situ data revealed a strong positive correlation between the presence of liquid water in the snow matrix and in situ TB in the 37 and 89 GHz frequencies. When considering TB ratios utilized by popular sea ice concentration algorithms (e.g., NASA Team 2), liquid water presence in the snow matrix was shown to increase the in situ TB gradient ratio of 37/19V. In situ gradient ratios of 89/19V and 89/19H were shown to correlate positively with UAV-derived melt pond coverage across the ice surface. Multi-scale comparison between in situ TB measurements and satellite-retrieved TB (by Advanced Microwave Scanning Radiometer 2) showed a distinct pattern of passive microwave TB signature at different stages of melt, confirmed by data from in situ thermophysical measurements. This pattern allowed for both in situ and satellite-retrieved TB to be partitioned into three discrete stages of sea ice melt: late spring, early melt and advanced melt. The results of this study thus advance the goal of achieving more accurate modeled predictions of the sea ice cover during the critical navigation and breakup period in Hudson Bay.en_US
dc.description.sponsorshipUniversity of Manitoba Graduate Fellowship (UMGF), NSERC Discovery Grant (DGB and DI), Northern Scientific Training Program (NSTP), Manitoba Hydro, Amundsen Science, and the Canada Research Chairs program.en_US
dc.identifier.citationHarasyn, M. L., Isleifson, D., Chan, W., Barber, D. G., 2020. Multi-scale observations of the co-evolution of sea ice thermophysical properties and microwave brightness temperatures during the summer melt period in Hudson Bay. Elem Sci Anth, 8: 16. https://doi.org/10.1525/elementa.412.en_US
dc.identifier.doi10.1525/elementa.412
dc.identifier.urihttp://hdl.handle.net/1993/34867
dc.language.isoengen_US
dc.publisherUniversity of California Press.en_US
dc.rightsopen accessen_US
dc.subjectsea iceen_US
dc.subjectpassive microwave remote sensingen_US
dc.subjectUAVen_US
dc.subjectbrightness temperatureen_US
dc.subjectmelt perioden_US
dc.subjectHudson Bayen_US
dc.titleMulti-scale observations of the co-evolution of sea ice thermophysical properties and microwave brightness temperatures during the summer melt period in Hudson Bayen_US
dc.typeArticleen_US
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