{"id":172,"date":"2017-11-18T22:23:31","date_gmt":"2017-11-19T03:23:31","guid":{"rendered":"https:\/\/carleton.ca\/cubiomet\/?page_id=172"},"modified":"2022-10-24T23:06:54","modified_gmt":"2022-10-25T03:06:54","slug":"tundra","status":"publish","type":"page","link":"https:\/\/carleton.ca\/cubiomet\/research\/tundra\/","title":{"rendered":"Arctic tundra"},"content":{"rendered":"

Carbon and energy exchange processes in Canadian Arctic tundra ecosystems<\/h2>\n

Subarctic and arctic ecosystems store vast amounts of carbon (C) within soils that are frozen \"\"and\/or saturated for the majority of the year, however, the response of C cycling in these environments to current and future climate change is uncertain. The net exchange of greenhouse gases such as carbon dioxide (CO2) and methane (CH4) between these ecosystems and the atmosphere dictates whether positive feedbacks associated with surface warming will accelerate climate change.<\/p>\n

As part of the Canadian Tundra Carbon Exchange Study established in 2004 with Peter Lafleur at Trent University, our research investigates the biotic and abiotic controls on energy, water, and carbon fluxes between a variety of arctic surfaces and the atmosphere.\u00a0 This research is located at the Daring Lake Tundra Ecosystem Research Station operated by the Government of the Northwest Territories about 300 km NE of Yellowknife, NT.\u00a0 The fly-in camp on Daring Lake is about 70 km north of the tree line and hosts a variety of tundra types including wet sedge meadows, tussock tundra, upland low shrub to tall shrub tundra, and wind-swept esker and exposed rocky outcrops.\u00a0 We currently have four eddy covariance towers running at this site and it is now the longest running collection of flux towers operating in the Canadian Arctic. Tundra sites include CA-DL1<\/a> (mixed tundra including tussock-sedge, dwarf-shrub, moss tundra and\u00a0erect dwarf-shrub tundra), CA-DL2<\/a> (\u00a0Arctic sedge fen), erect dwarf-shrub tundra and low shrub tundra.<\/p>\n

We are also collaborating with researchers from Queen\u2019s University at Cape Bounty on Melville Island (CBAWO<\/a>).\u00a0 Our one flux tower there gives us a glimpse on CO2 exchange processes during the short High Arctic summer.<\/p>\n

Research Highlights:<\/h2>\n

AGU EOS magazine (vol. 92 (26), pg. 224) \u201cEarlier Arctic snowmelt does not increase carbon sequestration\u201d<\/a>
\nNature Climate Change (vol. 1, pg. 190) \u201cResearch Highlights\u201d<\/p>\n

Selected Publications:<\/h2>\n

Zona, D., Lafleur, P. M., Hufkens, K., Bailey, B., Gioli, B., Burba, G., et al. 2022. Earlier snowmelt may lead to late season declines in plant productivity and carbon sequestration in Arctic tundra ecosystems. Scientific Reports<\/em>, 12<\/em>(1), 3986.<\/p>\n

Meyer G<\/u>, Humphreys ER, Melton JR, Cannon AJ, Lafleur PM. 2021. Simulating shrubs and their energy and carbon dioxide fluxes in Canada\u2019s Low Arctic with the Canadian Land Surface Scheme Including biogeochemical Cycles (CLASSIC). Biogeosciences<\/em>. 18(11): 3263-3283.<\/p>\n

Lafleur PM, Humphreys ER. 2018.\u00a0 Tundra shrub effects on growing season energy and carbon dioxide exchange.\u00a0 Environmental Research Letters<\/em>, 13, 055001, doi.org\/10.1088\/1748-9326\/aab863<\/p>\n

Ge L, Lafleur PM, Humphreys ER. 2017. Respiration from soil and ground cover vegetation under tundra shrubs. Arctic, Antarctic, and Alpine Research<\/em>, 49(4):537-550.<\/p>\n

Martin AF<\/u>, Lantz TC, Humphreys ER. 2018. Ice wedge degradation and CO2 and CH4 emissions in the Tuktoyaktuk Coastlands, NT. Arctic Science,<\/em> 4(1): 130-145,\u00a0 doi.org\/10.1139\/as-2016-0011.<\/p>\n

Emmerton CA, St Louis VL, Humphreys ER, Gamon JA, Barker JD, Pastorello GZ, 2016. Net ecosystem exchange of CO2<\/sub> with rapidly changing high Arctic landscapes. Global Change Biology<\/em>, 22, 1185-1200.<\/p>\n

Crawford, A.J.<\/u> D.R. Mueller, E.R. Humphreys, T. Carrieres, and H. Tran.\u00a0 2015. Surface ablation model evaluation on a drifting ice island in the Canadian Arctic. Cold Reg. Sci. Technol.<\/em> 110:170-182, doi: 10.1016\/j.coldregions.2014.11.011<\/p>\n

Grant, R.F., E.R. Humphreys, P.M. Lafleur, 2015.\u00a0 Ecosystem CO2<\/sub> and CH4<\/sub> exchange in a mixed tundra and a fen within a hydrologically diverse Arctic landscape: 1. Modeling versus measurements, Journal of Geophysical Research-Biogeosciences<\/em>, 120: 1366-1387.<\/p>\n

Campeau, A.B., P.M. Lafleur, and E.R. Humphreys, 2014.\u00a0 Landscape-scale variability in soil organic carbon storage in the central Canadian Arctic, Canadian Journal of Soil Science.<\/em>\u00a0 94(4): 477-488, 10.4141\/cjss-2014-018<\/p>\n

Emmerton, C.A., St. Louis, V.L., Lehnerr, I., Humphreys, E.R., Rydz, E., Kosolofski, H.R. 2014.\u00a0 The net exchange of methane with high Arctic landscapes during the summer growing season.\u00a0 Biogeosciences, 11: 3095\u20133106.<\/p>\n

Mbufong, H.N., Lund, M., Aurela, M., Christensen, T.R., Eugster, W., Friborg, T., Hansen, B.U., Humphreys, E.R., Jackowicz-Korczynski, M., Kutzbach, L. et al.\u00a0 2014.\u00a0 Assessing the spatial variability in peak season CO2 exchange characteristics across the Arctic tundra using a light response curve parameterization, Biogeosciences, 11: 4897-4912.<\/p>\n

Luus, K.A., Kelly, R.E.J., Lin, J.C., Humphreys, E.R., Lafleur, P.M., Oechel, W.C. 2013.\u00a0 Modeling the influence of snow cover on low Arctic net ecosystem exchange, Environ. Res. Lett<\/em>. 8, doi:10.1088\/1748-9326\/8\/3\/035045<\/p>\n

Lafleur, P.M., Humphreys, E.R., Myklebust, M.C., St. Louis, V.L., Papakyriakou, T., Poissant, L., Barker, J.D., Pilote, M.<\/u> and Swystun, K.A. 2012. Variation in peak growing season net ecosystem production across the Canadian Arctic.\u00a0 Environmental Science and Technology<\/em>, doi.org\/10.1021\/es300500m.<\/p>\n

Humphreys, E. R. and Lafleur, P.M. 2011. Does earlier snowmelt lead to greater CO2<\/sub> sequestration in two low Arctic tundra ecosystems? Geophysical Research Letters<\/em>, 38, L09703, doi:10.1029\/2011GL047339.<\/p>\n

Loranty, M. M., Goetz, S.J., Rastetter, E.B., Rocha, A.V., Shaver, G.R., Humphreys, E.R., and Lafleur, P.M. 2011.\u00a0 Scaling an instantaneous model of tundra NEE to the Arctic landscape.\u00a0 Ecosystems<\/em>, 14: 76-93.<\/p>\n

Wilson, K. S.<\/u> and Humphreys, E.R. 2010.\u00a0 Carbon dioxide and methane fluxes from arctic mudboils.\u00a0 Canadian Journal of Soil Science<\/em>, 90: 441-449<\/p>\n

Lafleur, P.M. and Humphreys, E.R. 2007.\u00a0 Spring warming and carbon dioxide exchange over low Arctic tundra in central Canada.\u00a0 Global Change Biology<\/em>, 14: 740-756.<\/p>\n","protected":false},"excerpt":{"rendered":"

Carbon and energy exchange processes in Canadian Arctic tundra ecosystems Subarctic and arctic ecosystems store vast amounts of carbon (C) within soils that are frozen and\/or saturated for the majority of the year, however, the response of C cycling in these environments to current and future climate change is uncertain. The net exchange of greenhouse […]<\/p>\n","protected":false},"author":7,"featured_media":0,"parent":127,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","_mi_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"yoast_head":"\nArctic tundra - Biometeorology<\/title>\n<meta name=\"description\" content=\"Carbon and energy exchange processes in Canadian Arctic tundra ecosystems Subarctic and arctic ecosystems store vast amounts of carbon (C) within soils\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/carleton.ca\/cubiomet\/research\/tundra\/\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/carleton.ca\/cubiomet\/research\/tundra\/\",\"url\":\"https:\/\/carleton.ca\/cubiomet\/research\/tundra\/\",\"name\":\"Arctic tundra - 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