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Polar endure habitat in Canada and jap Alaska when compared at finish of June 2012-2020

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.

Baffin Island Bylot Sound bear_smaller_shutterstock_1144169858

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.

Sea ice Canada 2020 June 29
Sea ice Canada 2019 Jun 30
Sea ice Canada 2018 June 29
Sea ice Canada 2017 June 24
Sea ice extent Canada 2016 June 29 CIS
Hudson Bay breakup June 29 2015_CIS
Sea ice extent Canada 2014 June 29 CIS
Sea ice in Canada Jun 30 2013

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) :

Sea ice extent Canada 2012 June 20

So, for comparability I come with beneath the 21 June chart for 2020:

Sea ice Canada 2020 June 21

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

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.

Baffin Island Bylot Sound bear_smaller_shutterstock_1144169858

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.

Sea ice Canada 2020 June 29
Sea ice Canada 2019 Jun 30
Sea ice Canada 2018 June 29
Sea ice Canada 2017 June 24
Sea ice extent Canada 2016 June 29 CIS
Hudson Bay breakup June 29 2015_CIS
Sea ice extent Canada 2014 June 29 CIS
Sea ice in Canada Jun 30 2013

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) :

Sea ice extent Canada 2012 June 20

So, for comparability I come with beneath the 21 June chart for 2020:

Sea ice Canada 2020 June 21

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

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