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Numerous studies exist of spatial trends in water chemistry, bioindicator groups, and paleoenvironmental change from High Arctic lakes; however, little is known about lake thermal stratification regimes at high latitudes beyond assumptions based on generalized classification schemes. Here, we report on the presence in late July 2022 of positive thermal stratification during open-water conditions in two freshwater lakes near Clements Markham Inlet, on northern Ellesmere Island. These lakes are situated in the polar desert at 82.6\u00b0N, &gt;1000\u00a0km north of the generally accepted northern limit of summer thermal stratification. Given their location approaching the northernmost land on Earth, the thermal profiles of these lakes suggest that the occurrence of summer stratification may no longer be discounted anywhere in the Northern Hemisphere. <\/jats:p>","DOI":"10.1139\/as-2023-0037","type":"journal-article","created":{"date-parts":[[2023,10,16]],"date-time":"2023-10-16T17:39:01Z","timestamp":1697477941000},"page":"225-232","update-policy":"https:\/\/doi.org\/10.1139\/csp-crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Evidence of summer thermal stratification in extreme northern lakes"],"prefix":"10.1139","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6629-4839","authenticated-orcid":false,"given":"Dermot","family":"Antoniades","sequence":"first","affiliation":[{"name":"Centre for Northern Studies (CEN) & Takuvik International Research Laboratory, Universit\u00e9 Laval","place":["Canada"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0026-2428","authenticated-orcid":false,"given":"Yohanna","family":"Klanten","sequence":"additional","affiliation":[{"name":"Centre for Northern Studies (CEN) & Takuvik International Research Laboratory, Universit\u00e9 Laval","place":["Canada"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2325-2927","authenticated-orcid":false,"given":"Emma","family":"Cameron","sequence":"additional","affiliation":[{"name":"Centre for Northern Studies (CEN) & Takuvik International Research Laboratory, Universit\u00e9 Laval","place":["Canada"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0187-2922","authenticated-orcid":false,"given":"Julia","family":"Garcia-Oteyza","sequence":"additional","affiliation":[{"name":"Universitat de Barcelona","place":["Catalonia, Spain"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6521-6388","authenticated-orcid":false,"given":"Marc","family":"Oliva","sequence":"additional","affiliation":[{"name":"Universitat de Barcelona","place":["Catalonia, Spain"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9055-1938","authenticated-orcid":false,"given":"Warwick F.","family":"Vincent","sequence":"additional","affiliation":[{"name":"Centre for Northern Studies (CEN), Takuvik International Research Laboratory & Institute of Integrative Biology and Systems (IBIS), Universit\u00e9 Laval","place":["Canada"]}]}],"member":"155","reference":[{"key":"refg1\/ref1","doi-asserted-by":"publisher","DOI":"10.34194\/ggub.v183.5207"},{"key":"refg2\/ref2","doi-asserted-by":"publisher","DOI":"10.1127\/0003-9136\/2003\/0158-0485"},{"key":"refg3\/ref3","doi-asserted-by":"publisher","DOI":"10.1657\/1938-4246-46.2.293"},{"key":"refg4\/ref4","doi-asserted-by":"publisher","DOI":"10.1002\/lno.11546"},{"key":"refg5\/ref5","volume-title":"Integrating hydrological connectivity and zooplankton in ponds and lakes in Arctic Canada","author":"Blackburn-Desbiens P.","year":"2023"},{"key":"refg6\/ref6","doi-asserted-by":"publisher","DOI":"10.1177\/0309133310375653"},{"key":"refg7\/ref7","doi-asserted-by":"publisher","DOI":"10.5194\/bg-14-559-2017"},{"key":"refg8\/ref8","unstructured":"Cappelen J. 2019. 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