Showing posts with label ozone. Show all posts
Showing posts with label ozone. Show all posts

Sunday, September 23, 2012

Recollections of the ISSI Lidar Temperature and Ozone Algorithms Working Group: Meeting 3

Wow been just over a week since I left Switzerland after a (hard!) working group meeting on lidar temperature and ozone algorithms (part of the Network for Detection of Atmospheric Composition Change, NDACC, lidar group). The International Space Science Institute was very accommodating to us, the weather was too nice (hard to work indoors through much of the day) and the meeting extremely productive. The group (including NDACC lidar scientists not at this meeting) is working on various issues of our data analysis with the goal of further improving the uniformity of the global data sets available from the NDACC program. During the week we spent considerable time on several details, some of which seem at first to not be important to the problem at hand. For instance, using our temperature measurements in the middle and upper atmosphere to investigate atmospheric change requires a fairly precise knowledge of Earth’s gravity at the surface. So we have to expand our expertise beyond the atmosphere into other areas, which to me is a fun part of being a scientist.

Our working group leader Thierry had us marching along in tight formation all and we obediently followed (for a bunch of scientists).


We worked hard all day but enjoyed dining together in the evening.


And not to worry! I got both a goat bell


and a cowbell (slightly smaller :-)


Pat and I have been happily clanging away all week. Here are a couple more pictures.

Friday, September 21, 2012

Duck sets the Record Straight on Canadian Arctic Science

the PEARL observatory in winter

Disturbing words from Canada’s Enviroment Minister Peter Kent. This past week he wrote a letter to the Victoria Times-Colonist mis-representing several important facts about the Harper Government’s brutal, targeted cuts on Arctic science. Prof. T. Duck (Dalhousie University) replies to Kent’s misrepresentation of the facts in a letter to iPolitics.ca, concluding:

… point-by-point Kent’s claims about PEARL are factually incorrect. Many other claims in the Times-Colonist letter have been so profoundly discredited that it is no small wonder he had the gall to utter them. This past week, in response to criticism he had “misled Canadians”, Kent told an opposition MP that she should talk to “better informed scientists”. What we really need is a better-informed Minister.

I encourage you to read the rest of Prof. Duck’s letter on iPolitics.ca. 

Friday, June 1, 2012

Comparisons with the NASA ALVICE lidar are in Progress, so… Why Measure Water Vapour in the Upper Atmosphere?

The Crows have become Night Owls and put in a Herculean effort in the last couple weeks to prepare and begin measurements with our Network for the Detection of Atmospheric Composition Change (NDACC) colleagues from NASA’s Goddard Space Flight Center. The group we are collaborating with is led by Dr. Dave Whiteman and their lidar system is called ALVICE: Atmospheric Lidar for Validation, Interagency Collaboration and Education.



The NASA ALVICE trailer parked out at Western’s Environmental Science Research Facility. The building housing the PCL system is just to the left of the trailer.

The ALVICE system is mobile, meaning that it can be transported in a self-contained trailer. The system can measure water vapor mixing ratio, aerosol backscatter/extinction/depolarization and temperature in both daytime and nighttime. The ALVICE group is not just from NASA but includes students and faculty from Howard University in Washington DC, as well as collaborating scientists from Brazil and Bolivia.

The goal of our measurements over the next month is to compare our measurements to validate our system calibrations, by inter-comparisons, balloon measurements, calibration sources and satellites. The balloon measurements include regular weather balloons plus ozonesondes and frost point hygrometers, which are carried up by a balloon into the stratosphere to measure the small (a few ppmv) but important amount of water vapour present (1 ppmv means in a cubic litre of air in the lower stratosphere for every million air molecules there is 1 water vapour molecule). The PCL has been able to do these validation checks in the past in the lower and middle troposphere (the lower part of the atmosphere below about 12 km altitude) but has not had the ability to validate its measurements in the upper troposphere and lower stratosphere (the UTLS).

The UTLS is of great importance in large part due to water vapour, as water vapour is important in the chemistry of ozone. If the temperature changes in the troposphere it affects the amount of water vapour which can mix into the stratosphere and interact with ozone. Assessing this situation is complicated. Weather and climate are highly complex systems that are fully nonlinear, meaning that small changes to the system in one location can cause large feedbacks throughout the system. Weather is inherently highly variable, particular at middle latitudes. To make matters more complicated, humans have a significant affect on the already highly unstable natural cycle. The body of evidence shows we are in a period of rapid warming near the surface that is due to human activity, which appears to be having significant affects on the weather. To further complicate the affect of temperature change, for a significant period of time we released a large amount of chlorofluorocarbons into the lower atmosphere, which made there way into the stratosphere and caused unnaturally large ozone losses, particularly at the poles (e.g. polar ozone holes). Goals of the NDACC program include trying to understand these interactions be making long term measurements of water vapour, ozone and temperature.

An image from the International Space Station shows a pileus cloud forming over the Sarychev volcanic eruption in 2009 (from the Wikipedia page on Pileus Clouds).
In addition to affecting ozone chemistry, the UTLS is a region of important dynamical interactions between air in the stratosphere and troposphere The tropospheric air can contain natural and anthropogenic pollutants, which are carried into the stratosphere and distributed on a global-scale before falling back to the surface, a process called stratosphere-troposphere exchange. We used to imagine that the stratosphere and troposphere were separated by a rigid “lid”, (the temperature inversion which defines the tropopause). Dur­ing times of intense convection over cumulonimbus clouds a pileus cloud would occasionally be observed to form in the lower stratosphere, but otherwise dry, ozone-rich stratospheric air was separated from relatively moist, ozone-depleted tropospheric air. However, it is now known that when the speed of the jet stream intensifies in regions of surface cyclogenesis tropospheric folds can develop which can cause air to rapidly be exchanged between the upper troposphere and lower stratosphere.

It is just now being recognized another factor which can affect water vapour and ozone in the UTLS is due to forest fires. We are already at the start of what is appearing to be a extremely active fire season. A small number of these fires can develop into huge wildfires that can combine with severe thunderstorms, where vigorous convection is occurring. It was only recently appreciated that this convection can be so strong that smoke particles and carbon monoxide can be carried into the stratosphere and transported great distances. While initial reaction to this idea was met with some skepticism, measurements have clearly demonstrated this is the case. With global warming comes more forest fire activity, and pyroconvection may have significant implications on ozone and temperature change. There has been activity the last few days from fires out West that may bring some of this smoke over the London area.



Measurements of a smoke layer in the UTLS due to a fire in northern Saskatchewan (from Doucet, 2009).

I will post more updates as the campaign progresses. In fact I just heard we had a successfully FPH flight last night (though it looks like we would need a submarine to recover this one as it landed in Lake Ontario, drat!).

Friday, March 16, 2012

When Opinion Trumps Scientific Reason #TheMark #PEARL #ozone #EnvironmentCanada

Or the ideological basis for federal cuts to environmental spending.

The closure of Canada’s Polar Environment Atmospheric Research Lab (PEARL) has shocked many Canadians. Located at 80°N in the High Arctic on Ellesmere Island, Nunavut, PEARL is the northernmost civilian research laboratory in the world. It is internationally recognized for ozone and climate research, and helped discover the first-ever Arctic ozone hole in 2011. PEARL is a Canadian success story that one U.S. government scientist deemed a “national treasure.” Now, many are left wondering why the Canadian government decided to bury that treasure.

Like most university-based environmental-research programs, PEARL depends upon federal grants to operate. However, in recent years, funding opportunities for projects like PEARL have been narrowed or eliminated. Government support for PEARL’s main sponsor, the Canadian Foundation for Climate and Atmospheric Sciences was cut off. Funding that was promised for climate and atmospheric science in the 2011 Federal Budget has been held up for nearly a year. The impact of this funding gap is far from benign. It has forced some of Canada’s best researchers to leave the country to find work. These experts were cultivated in Canada over many years and at great cost. It will take a generation to replace them.

Related: Environment and Economics: A False Dichotomy

The funding crisis at our universities mirrors the ongoing cutbacks at Environment Canada (EC). In July 2011, the government announced that it would eliminate 776 positions from EC, with 300 staff to be declared surplus. The cuts are undermining important research and monitoring programs in ozone, atmospheric radiation, climate adaptation, environmental toxics, air quality, and airborne research. Canadians depend upon these programs to ensure their environmental security, health, and safety.

How, then, can the government sufficiently defend these cutbacks?

It’s possible that a scientific review conducted by knowledgeable experts could provide the appropriate justification. However, no such review has taken place. At the 2012 World Economic Forum in Davos, Prime Minister Stephen Harper said that Canada’s investments in science and technology have produced poor results and are a “significant problem for our country.” Given the lack of expert assessment, however, his comments are without merit: They represent his unscientific opinion, and nothing more. Scientists the world over are lamenting what is happening to Canada’s scientific community.

Canadian governments once understood that good policy is informed by science. In 1988, Brian Mulroney’s Progressive Conservatives commissioned independent experts to conduct a review of EC’s ozone program. The resulting report (“Measuring the Impacts of Environment Canada’s R&D: Case Study: Stratospheric Ozone Depletion Research,” 1998) stated that for every dollar spent on the program, Canadians received almost $13 in benefits to their health, environment, and economy. Health benefits included the avoidance of over 57,000 cases of skin cancer, 30,000 cases of cataracts, and 625 deaths in Canada over a 60-year period. Unfortunately, the Harper Conservatives have sought to dismantle what the Progressive Conservatives saw worthy of support.

What’s particularly concerning is that the cuts to Canada’s environmental-monitoring programs are not about money. PEARL costs $1.5 million per year to operate, and EC’s ozone program likely costs about $1 million per year. Compare these costs with those of the government’s flagship programs: The budget for purchasing and servicing one F-35 fighter jet ($246 million, based on calculations from numbers given here) would power PEARL half way into the next century. The budget for new prisons ($9.5 billion) might have seen PEARL into the next ice age. The cost of gazebos and other perks that were built for Muskoka in the run-up to the G8 meeting of 2010 ($50 million) would have supported EC’s ozone program for the next 50 years. The budget for the War of 1812 celebrations ($28 million) could have supported either program for decades.

Related: Obstinate Harper Fuels Pipeline Opposition

If money is not the issue, then why is the Canadian government so bent on making cuts to environmental spending? Harper made this clear last year during a trip to the Arctic, when he opined that environmental concerns cannot be allowed to stand in the way of economic development. This is a dangerous attitude. The economy doesn’t exist independent of the environment. A 1990 report from the United Steelworkers explains it best: “The real choice is not jobs or environment. It’s both or neither. What kind of jobs will be possible in a world of depleted resources, poisoned water and foul air, a world where ozone depletion and greenhouse warming make it difficult even to survive?”

Unfortunately, the government has systematically reduced scrutiny of the impacts of its economic and environmental policies by eliminating or crippling important research programs like PEARL. The widespread muzzling of EC scientists has further removed expert opinions from the debate. Clearly, the government cannot protect the future health and safety of Canadians and Canada’s economic viability without reliable information about environmental change. Yet, that is exactly what it is trying to do. It is the triumph of ideology over reason.

Photo 1 courtesy of Hermann Berg; Photo 2 courtesy of Tobias Kerzenmacher.

Op-ed piece from The Mark by Prof. T. Duck of Dalhousie. We continue to ask the question of why funding has been cut for Arctic ozone research when the amount of funding needed to continue this work (per year) is LESS THEN 5% OF RUN-UP COSTS OF THE G8 MEETING IN MUSKOKA (which was actually held 3.5 hours away in Toronto)?

Money, for a change, does not appear to be the issue here.

Monday, February 13, 2012

Canada dropping the #ozone ball, scientists warn - Politics - CBC News

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via cbc.ca
The CBC has picked up the AGU EOS article. I noticed the first commenter saying if EC thinks it is important they should cut something else. I would ask what would you do if your income was suddenly cut in half? Cut eating so you could heat your home? Live in a tent and eat better? Don't natter on about EC and priorities. Unless you think they should eliminate providing weather forecasts in Ontario to pay for their ozone program! Or do you believe they should outsource forecasting to another met service?

Friday, February 10, 2012

Ouch! From @theAGU #EOS: #EnvironmentCanada Cuts Threaten the Future of Science & International Agreements #ozone

Top American Atmospheric Scientists conclude:


We are concerned, in light of the Environment Canada budget cuts, that the international community may no longer be able to rely on the exceptional efforts and past leadership role provided by Canada for Arctic research. 

The Harper government is turning it's back on Canada's "True North" stewardship by implementing draconian cuts to ozone science that will not allow Canada to fulfil several international treaties it is party to including the Montreal protocol (how ironic!) and the US-Canada Air Quality agreement.

Download the article from AGU's EOS Transactions Newsletter here (pdf).

Monday, January 2, 2012

Arctic mystery: What killed the ozone, and will it strike again? @margaretmunro

Margaret Munro did a story today in the Montreal Gazette about last winter's severe Arctic ozone loss and a look forward to our Polar Sunrise campaign, will which continue these measurements and allow us to see what 2012 has in store.

Monday, September 12, 2011

Hey rest of the world: you gonna let us get away with this: Canadian ozone network faces axe : Nature News



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This article is no joke, the Harper Government wants Environment Canada out of the business of measuring ozone, including some of the most critical locations for ozone measurements in the high Arctic. If you find this unpalatable then let the Canadian government know this anyway you can!