Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago

dc.contributor.authorMarshall, Stephen
dc.contributor.authorScott, K. Andrea
dc.contributor.authorScharien, Randall K.
dc.date.accessioned2019-07-15T22:21:00Z
dc.date.available2019-07-15T22:21:00Z
dc.date.copyright2019en_US
dc.date.issued2019
dc.description.abstractThe Canadian Arctic Archipelago (CAA) presents unique challenges to the determination of melt onset (MO) using remote sensing data. High spatial resolution data is required to discern melt onset among the islands and narrow waterways of the region. Current passive microwave retrievals use daily averaged 19 GHz and 37 GHz data from the multi-channel microwave radiometer (SMMR) and/or the special sensor microwave/imager (SSM/I). The development of a new passive microwave melt onset method capable of using higher resolution data is desirable. The new passive microwave melt onset method described here, named the Dynamic Threshold Variability Method (DTVM), uses higher resolution data from the 37 GHz vertically-polarized channel from the advanced microwave scanning radiometers (AMSR-E and AMSR-2). The DTVM MO detection methodology differs from previously presented passive microwave Arctic MO methods in that it does not use a fixed threshold of a brightness temperature parameter. Instead, the DTVM determines MO dates based on the distribution of dates corresponding to the exceedance of a range of brightness temperature variability thresholds. The method also uses swath data instead of daily averaged brightness temperatures, which is found to lead to improved melt detection. Two current passive microwave MO methods are compared and evaluated for applicability in the CAA alongside the DTVM. The DTVM provides MO dates at a higher spatial resolution than earlier methods in addition to higher correlation with MO dates from surface air temperature (SAT) reanalyses. It is found that, for some years, MO dates in the CAA exhibit a latitudinal dependence, while in other years the MO dates in the CAA are relatively uniform across the domain.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipFunding for this research was provided by Polar Knowledge Canada (POLAR) grant #NST-1718-0024.en_US
dc.identifier.citationMarshall, S., Scott, K.A. & Scharien, R.K. (2019). Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago. Remote Sensing, 11(11), 1304. http://dx.doi.org/10.3390/rs11111304en_US
dc.identifier.urihttp://dx.doi.org/10.3390/rs11111304
dc.identifier.urihttp://hdl.handle.net/1828/10965
dc.language.isoenen_US
dc.publisherRemote Sensingen_US
dc.subjectsea iceen_US
dc.subjectmelt onseten_US
dc.subjectpassive microwaveen_US
dc.titlePassive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelagoen_US
dc.typeArticleen_US

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