5 record(s) found with the tag "ultraviolet radiation" (multi-year projects are grouped):
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Variability in peat plateau energy balance and water chemistry along a warming gradient
Principal Investigator: English, Michael C
Licenced Year(s): 2013
Summary: This research is physically based on a peat plateau and a peat bog, both close to Yellowknife. There are two primary objectives to this research. The first involves quantifying surface energy balances in areas where degradation of peat is pronounced and where it is not. Suprapermafrost water from the degraded and non-degraded sites will be analyzed for nutrients and dissolved organic carbon (DOC) ...


Biogeochemistry of Lakes in the Mackenzie Delta
Principal Investigator: Lesack, Lance
Licenced Year(s): 2016 2015 2014 2010 2009 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993
Summary: The long term goal of this research is to develop a biogeochemical model for lakes in the Mackenzie Delta and a model for assessing the effects of stresses on rivers resulting from global change. In particular, this field season will focus on three areas...


UV-B Impacts On The Microbial Food Web In High Arctic Freshwater Ecosystems
Principal Investigator: Vincent, W.F.
Licenced Year(s): 1994
Summary: There is increasing evidence that levels of solar UV-B radiation have begun to rise in the high Arctic. Little is known about microbial life-forms in the ecosystems of Arctic lakes and rivers and their UV-B resistance. A sampling hole will be drilled in the lake ice. These samples of zooplankton will be studied by a microscope. Samples of water and periphytic communites will also be taken. Underw...


The effect of UV light on bacterial growth rates in lakes and ponds in the Canadian High Arctic
Principal Investigator: Howard, Susan
Licenced Year(s): 1993 1992
Summary: Ozone depletion in the High Arctic could result in exposure of aquatic organisms (such as bacteria) to higher levels of ultraviolet (UV) radiation from the sun. This increased exposure to radiation may be harmful to bacteria and have an effect on organisms which feed on bacteria. I will collect water samples from lakes and ponds in the Resolute area in order to measure bacterial growth rates as ...


Licence #2506
Principal Investigator: Hickie, John P.
Licenced Year(s): 1979
Summary: To monitor the intensity of ultraviolet B radiation from the sun and collect blood samples from collared lammings for vitamin D content determination. The purpose of this work is to determine if native people whose diet is changing will need supplementary vitamin D to prevent certain types of disease, (e.g. rickets)....


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