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style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: Hi all, The green light in Wolfville is explained very well at; http://www.coralnet.ca/aboutcoral.html "The Canadian Operational Research Aerosol Lidar Network (CORALNet) was established in 2008 to look at the degree of long-range transported aerosols. Aerosols are tiny particles suspended in the air. Some occur naturally (biogenic), coming from volcanoes, dust storms, forest and grassland fires, living vegetation and sea spray while others result from human activities (anthropogenic), such as burning fossil fuels and altering natural surface cover." At this website there is a map where you can click on the Acadia site (or others across Canada) and view the various results of the lidar, (up to date or you can view days in the past) it graphs the aerosols at two wave lengths showing the height in the atmosphere where they were recorded and the density of them, the temperature, humidity and atmospheric pressure, wind direction and speed, and rain rate. It is interesting to view the graphs for days that we notice something of significance; days when it seemed humid, or colourful sunsets, or hazy or smoggy days. The graphs are very different on these days. Also the comparison of the same day at different sites across the country is interesting. There is far more information here than what I understand but I am hopeful that those that do will use this tremendous volume of data to help explain various climate patterns and help all of us make good decisions. George Forsyth Quoting "James W. Wolford" <jimwolford@eastlink.ca>: > We in Wolfville have a similar green laser that is aimed sharply > upward from the Irving Centre on campus, and it is my understanding > that somehow it samples and monitors aerosols in the atmosphere? Ours > has been in operation for at least a couple of years and is often > quite obvious to us. I have heard too that they have some arrangement > to not disrupt flights that pass through that area and sometimes turn > off the laser. Cheers from Jim in Wolfville > > Begin forwarded message: > >> From: "Stephen R. Shaw" <srshaw@Dal.Ca> >> Date: July 24, 2011 12:16:37 AM ADT >> To: naturens@chebucto.ns.ca, Shawn Miner <preserve101@hotmail.com> >> Cc: "naturens@chebucto.ns.ca " <naturens@chebucto.ns.ca> >> Subject: Re: [NatureNS] Straight Green Line in the Sky >> Reply-To: naturens@chebucto.ns.ca >> >> There's a green laser system run off the top of the A&A Building at >> Dalhousie some nights by atmospheric science people at the uni. >> It's called LIDAR or some similar acronym and is used to sample >> the atmosphere (the bounced-back beam is analyzed). If it is >> misty or cloudy, it is more noticeabl and was running last night >> too. >> Steve, Halifax >> >> Quoting Shawn Miner <preserve101@hotmail.com>: >> >>> Good Evening, >>> >>> I'm out on Queen St. in Halifax and there is a long, morphing >>> green line in the sky. Any guesses on what it might be? >>> >>> Cheers, >>> Shawn >>> Sent from my BlackBerry. >> >>
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