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Reposted from Polar Endure Science
Posted on June 29, 2020 |
Here’s a fast evaluate and distinction of sea ice habitat for polar bears in Canada and the Southern Beaufort area of jap Alaska close to the top of June, 2012-2020.
Similarities between Hudson Bay ice/open water within the sea ice charts beneath are placing. Ice quilt on the finish of June proven in those charts since 2012 reinforces the truth, documented within the peer-reviewed literature, that there was no persevered declining development in dates of sea ice breakup for Western and Southern Hudson Bay since 1998 no less than (Castro de los angeles Guardia et al. 2017; Lunn et al. 2016). WH bears are nonetheless at the ice.
As a end result, contemporary declarations of drawing close doom for Hudson Bay polar bears, in line with claims of decreased inhabitants dimension and well being of those subpopulations – which in the end are statistically insignificant for WH and SH (Obbard et al. 2018; Dyck et al. 2017) – should be because of any other motive (Crockford 2020).
In all spaces, winds fairly than soften because of greater temperatures force a lot of the growth of open water at the moment of 12 months.
The one chart I’ve for 2012 (the 12 months of the lowest-since-1979 summer time ice minimal) is for 20 June (there’s no professional archive of those explicit charts) :
So, for comparability I come with beneath the 21 June chart for 2020:
REFERENCES
Castro de los angeles Guardia, L., Myers, P.G., Derocher, A.E., Lunn, N.J., Terwisscha van Scheltinga, A.D. 2017. Sea ice cycle in western Hudson Bay, Canada, from a polar endure standpoint. Marine Ecology Development Sequence 564: 225–233. http://www.int-res.com/abstracts/meps/v564/p225-233/
Crockford, S.J. 2020. State of the Polar Endure Document 2019. International Warming Coverage Basis Document 39, London. pdf right here.
Dyck, M., Campbell, M., Lee, D., Boulanger, J. and Hedman, D. 2017. Aerial survey of the Western Hudson Bay polar endure sub-population 2016, ultimate file (26 June 2017). Standing file 2017-xx, Nunavut Division of Atmosphere, Natural world Analysis Segment. Igloolik, Nunavut. pdf right here.
Lunn, N.J., Servanty, S., Regehr, E.V., Speak, S.J., Richardson, E. and Stirling, I. 2016. Demography of an apex predator on the fringe of its vary – affects of adjusting sea ice on polar bears in Hudson Bay. Ecological Packages 26(five): 1302-1320. DOI: 10.1890/15-1256
Obbard, M.E., Stapleton, S., Szor, G., Middel, Okay.R., Jutras, C. and Dyck, M. 2018. Estimating the abundance of the Southern Hudson Bay polar endure subpopulation with aerial surveys. Arctic Science https://doi.org/10.1139/AS-2018-0004
Comparable
Posted on June 29, 2020 |
Here’s a fast evaluate and distinction of sea ice habitat for polar bears in Canada and the Southern Beaufort area of jap Alaska close to the top of June, 2012-2020.
Similarities between Hudson Bay ice/open water within the sea ice charts beneath are placing. Ice quilt on the finish of June proven in those charts since 2012 reinforces the truth, documented within the peer-reviewed literature, that there was no persevered declining development in dates of sea ice breakup for Western and Southern Hudson Bay since 1998 no less than (Castro de los angeles Guardia et al. 2017; Lunn et al. 2016). WH bears are nonetheless at the ice.
As a end result, contemporary declarations of drawing close doom for Hudson Bay polar bears, in line with claims of decreased inhabitants dimension and well being of those subpopulations – which in the end are statistically insignificant for WH and SH (Obbard et al. 2018; Dyck et al. 2017) – should be because of any other motive (Crockford 2020).
In all spaces, winds fairly than soften because of greater temperatures force a lot of the growth of open water at the moment of 12 months.
The one chart I’ve for 2012 (the 12 months of the lowest-since-1979 summer time ice minimal) is for 20 June (there’s no professional archive of those explicit charts) :
So, for comparability I come with beneath the 21 June chart for 2020:
REFERENCES
Castro de los angeles Guardia, L., Myers, P.G., Derocher, A.E., Lunn, N.J., Terwisscha van Scheltinga, A.D. 2017. Sea ice cycle in western Hudson Bay, Canada, from a polar endure standpoint. Marine Ecology Development Sequence 564: 225–233. http://www.int-res.com/abstracts/meps/v564/p225-233/
Crockford, S.J. 2020. State of the Polar Endure Document 2019. International Warming Coverage Basis Document 39, London. pdf right here.
Dyck, M., Campbell, M., Lee, D., Boulanger, J. and Hedman, D. 2017. Aerial survey of the Western Hudson Bay polar endure sub-population 2016, ultimate file (26 June 2017). Standing file 2017-xx, Nunavut Division of Atmosphere, Natural world Analysis Segment. Igloolik, Nunavut. pdf right here.
Lunn, N.J., Servanty, S., Regehr, E.V., Speak, S.J., Richardson, E. and Stirling, I. 2016. Demography of an apex predator on the fringe of its vary – affects of adjusting sea ice on polar bears in Hudson Bay. Ecological Packages 26(five): 1302-1320. DOI: 10.1890/15-1256
Obbard, M.E., Stapleton, S., Szor, G., Middel, Okay.R., Jutras, C. and Dyck, M. 2018. Estimating the abundance of the Southern Hudson Bay polar endure subpopulation with aerial surveys. Arctic Science https://doi.org/10.1139/AS-2018-0004
