Regional influence of ocean–atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada
We use the twice-daily Moderate Resolution Imaging Spectroradiometer (MODIS) snow cover product to study the regional influence of the Oceanic Niño Index (ONI) and Pacific Decadal Oscillation (PDO) on snow cover in British Columbia (BC). We apply a locally weighted regression (LOWESS) interpolation...
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ftdoajarticles:oai:doaj.org/article:49934c8d82f34eb2ba326f7b24c5c0bf 2023-05-15T18:32:28+02:00 Regional influence of ocean–atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada A. R. Bevington H. E. Gleason V. N. Foord W. C. Floyd H. P. Griesbauer 2019-10-01T00:00:00Z https://doi.org/10.5194/tc-13-2693-2019 https://doaj.org/article/49934c8d82f34eb2ba326f7b24c5c0bf EN eng Copernicus Publications https://www.the-cryosphere.net/13/2693/2019/tc-13-2693-2019.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-13-2693-2019 1994-0416 1994-0424 https://doaj.org/article/49934c8d82f34eb2ba326f7b24c5c0bf The Cryosphere, Vol 13, Pp 2693-2712 (2019) Environmental sciences GE1-350 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/tc-13-2693-2019 2022-12-31T12:51:56Z We use the twice-daily Moderate Resolution Imaging Spectroradiometer (MODIS) snow cover product to study the regional influence of the Oceanic Niño Index (ONI) and Pacific Decadal Oscillation (PDO) on snow cover in British Columbia (BC). We apply a locally weighted regression (LOWESS) interpolation to the MODIS normalized difference snow index (NDSI) time series to detect the timing and duration of snow. We confirm the general consensus from many previous in situ studies that both ONI and PDO have significant impacts on snow cover in BC. We add to this knowledge by performing seasonal and regional analysis using established hydrozones and explore variation in our results by elevation bins of 500 m. We calibrated our method with in situ snow water equivalent (SWE) data and found an optimal NDSI threshold of 30 for detecting continuous snow cover. We separate automatic snow weather station data into calibration (75 %) and validation (25 %) subsets and obtain mean absolute errors between the MODIS and in situ observations for the start, end, and duration of 8.7, 8.9, and 13.1 d for the calibration data and 12.7, 12.6, and 16.6 d for the validation data, respectively. In general, the start date of snow is poorly correlated with both ONI and PDO, whereas the end date and duration are strongly negatively correlated. Regional patterns emerge wherein northern and southern BC are most correlated with the PDO and the ONI, respectively. These relationships are generally stronger at lower elevations and vary spatially. This study demonstrates that the suitability of ocean–atmosphere teleconnections as predictors of the timing and duration of snow varies throughout BC. Article in Journal/Newspaper The Cryosphere Directory of Open Access Journals: DOAJ Articles Canada Pacific British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) The Cryosphere 13 10 2693 2712 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 A. R. Bevington H. E. Gleason V. N. Foord W. C. Floyd H. P. Griesbauer Regional influence of ocean–atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
We use the twice-daily Moderate Resolution Imaging Spectroradiometer (MODIS) snow cover product to study the regional influence of the Oceanic Niño Index (ONI) and Pacific Decadal Oscillation (PDO) on snow cover in British Columbia (BC). We apply a locally weighted regression (LOWESS) interpolation to the MODIS normalized difference snow index (NDSI) time series to detect the timing and duration of snow. We confirm the general consensus from many previous in situ studies that both ONI and PDO have significant impacts on snow cover in BC. We add to this knowledge by performing seasonal and regional analysis using established hydrozones and explore variation in our results by elevation bins of 500 m. We calibrated our method with in situ snow water equivalent (SWE) data and found an optimal NDSI threshold of 30 for detecting continuous snow cover. We separate automatic snow weather station data into calibration (75 %) and validation (25 %) subsets and obtain mean absolute errors between the MODIS and in situ observations for the start, end, and duration of 8.7, 8.9, and 13.1 d for the calibration data and 12.7, 12.6, and 16.6 d for the validation data, respectively. In general, the start date of snow is poorly correlated with both ONI and PDO, whereas the end date and duration are strongly negatively correlated. Regional patterns emerge wherein northern and southern BC are most correlated with the PDO and the ONI, respectively. These relationships are generally stronger at lower elevations and vary spatially. This study demonstrates that the suitability of ocean–atmosphere teleconnections as predictors of the timing and duration of snow varies throughout BC. |
format |
Article in Journal/Newspaper |
author |
A. R. Bevington H. E. Gleason V. N. Foord W. C. Floyd H. P. Griesbauer |
author_facet |
A. R. Bevington H. E. Gleason V. N. Foord W. C. Floyd H. P. Griesbauer |
author_sort |
A. R. Bevington |
title |
Regional influence of ocean–atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada |
title_short |
Regional influence of ocean–atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada |
title_full |
Regional influence of ocean–atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada |
title_fullStr |
Regional influence of ocean–atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada |
title_full_unstemmed |
Regional influence of ocean–atmosphere teleconnections on the timing and duration of MODIS-derived snow cover in British Columbia, Canada |
title_sort |
regional influence of ocean–atmosphere teleconnections on the timing and duration of modis-derived snow cover in british columbia, canada |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-2693-2019 https://doaj.org/article/49934c8d82f34eb2ba326f7b24c5c0bf |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
Canada Pacific British Columbia |
geographic_facet |
Canada Pacific British Columbia |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 13, Pp 2693-2712 (2019) |
op_relation |
https://www.the-cryosphere.net/13/2693/2019/tc-13-2693-2019.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-13-2693-2019 1994-0416 1994-0424 https://doaj.org/article/49934c8d82f34eb2ba326f7b24c5c0bf |
op_doi |
https://doi.org/10.5194/tc-13-2693-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
10 |
container_start_page |
2693 |
op_container_end_page |
2712 |
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1766216585694937088 |