Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago
The 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 aver...
Published in: | Remote Sensing |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
MDPI AG
2019
|
Subjects: | |
Online Access: | https://doi.org/10.3390/rs11111304 https://doaj.org/article/85c8ce764a4e4acaaafe1186d9f0f0f2 |
id |
ftdoajarticles:oai:doaj.org/article:85c8ce764a4e4acaaafe1186d9f0f0f2 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:85c8ce764a4e4acaaafe1186d9f0f0f2 2023-05-15T14:28:46+02:00 Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago Stephen Marshall K. Andrea Scott Randall K. Scharien 2019-05-01T00:00:00Z https://doi.org/10.3390/rs11111304 https://doaj.org/article/85c8ce764a4e4acaaafe1186d9f0f0f2 EN eng MDPI AG https://www.mdpi.com/2072-4292/11/11/1304 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs11111304 https://doaj.org/article/85c8ce764a4e4acaaafe1186d9f0f0f2 Remote Sensing, Vol 11, Iss 11, p 1304 (2019) sea ice melt onset passive microwave Science Q article 2019 ftdoajarticles https://doi.org/10.3390/rs11111304 2022-12-30T20:33:07Z The 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. Article in Journal/Newspaper Arctic Archipelago Arctic Canadian Arctic Archipelago Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Canadian Arctic Archipelago Remote Sensing 11 11 1304 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
sea ice melt onset passive microwave Science Q |
spellingShingle |
sea ice melt onset passive microwave Science Q Stephen Marshall K. Andrea Scott Randall K. Scharien Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago |
topic_facet |
sea ice melt onset passive microwave Science Q |
description |
The 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. |
format |
Article in Journal/Newspaper |
author |
Stephen Marshall K. Andrea Scott Randall K. Scharien |
author_facet |
Stephen Marshall K. Andrea Scott Randall K. Scharien |
author_sort |
Stephen Marshall |
title |
Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago |
title_short |
Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago |
title_full |
Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago |
title_fullStr |
Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago |
title_full_unstemmed |
Passive Microwave Melt Onset Retrieval Based on a Variable Threshold: Assessment in the Canadian Arctic Archipelago |
title_sort |
passive microwave melt onset retrieval based on a variable threshold: assessment in the canadian arctic archipelago |
publisher |
MDPI AG |
publishDate |
2019 |
url |
https://doi.org/10.3390/rs11111304 https://doaj.org/article/85c8ce764a4e4acaaafe1186d9f0f0f2 |
geographic |
Arctic Canadian Arctic Archipelago |
geographic_facet |
Arctic Canadian Arctic Archipelago |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago Sea ice |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago Sea ice |
op_source |
Remote Sensing, Vol 11, Iss 11, p 1304 (2019) |
op_relation |
https://www.mdpi.com/2072-4292/11/11/1304 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs11111304 https://doaj.org/article/85c8ce764a4e4acaaafe1186d9f0f0f2 |
op_doi |
https://doi.org/10.3390/rs11111304 |
container_title |
Remote Sensing |
container_volume |
11 |
container_issue |
11 |
container_start_page |
1304 |
_version_ |
1766302923291099136 |