Fischer, Olson and Allison discuss the making of the film in this Q&A:

Q: What was it about the lakes that drew your research interest?

Olson: It started as a purely scientific interest. Janet and I were researching effects of ultraviolet radiation on aquatic ecosystems and we viewed mountain lakes as ideal study systems because they are highly transparent and at high elevation. We quickly found out that the lakes are highly variable in their color and their transparency, from one lake to the next.

Q: Is every lake crystal clear?

Olson: Many lakes are, but there are also many that are not. This variation reflects characteristics of lake catchments.  In particular, transparency and color are affected by the presence and size of glaciers that feed mountain lakes. Glacial melt brings in finely ground rock flour, which reduces transparency and also absorbs and scatters light to make the blues and the turquoise. Our current research focuses on the implications of increasing transparency due to glacier loss.

Q: So, you followed your research and that is how you reached this point?

Olson: Yes. The lakes are an hour-to-two-hour hike—we carry all of our gear in; we unpack everything, take samples; and come back out. We run into people on the trail and we have these big packs with paddles sticking out of them so questions come up. One of the questions we always get is, 'Do you have a boat in your pack? ' But the question we get the most is about that unique [blue] color, 'Why are they that color?'

Fischer: They’ll also say, 'You know, I was here last month and it looked totally different.' Or 'My family comes and does this hike once a year and the lakes are different every year.' We feel like our research and our understanding of the lakes can help answer their questions. They’re naturally curious, which is really telling.

Q: So, the experience along the trail, of people asking about the lakes, prompted the idea of this movie?

Olson: Our funding agency, the National Science Foundation, requires a broader impact—What is the benefit of this research beyond publishing papers and training students? Early on, Janet said, 'We have this connection with people on the trail.' We need to do that with a larger group, and that’s where the movie came from. In fact, in the NSF proposal, Janet had the tentative title of 'Losing Blue' and the idea that the way to connect with people is through this movie.

Fischer: Right away, we reached out to Leanne about a possible movie, and thankfully, she was interested. We used a small amount of money in our NSF grant to contract with Leanne, who collected some preliminary footage. She took that footage and pitched the project to the National Film Board (NFB) of Canada. NFB produced the film, and also handles the distribution and promotion.

Q: How did your involvement as science advisers work in the film’s production?

Fischer: Early on, Leanne and screenwriter James MacKinnon joined us in the field.  They received a crash course in alpine lake limnology and lake optics as they brainstormed ideas for the movie.  James ran the script by us and many other mountain researchers, Leanne engaged us at every stage of filming —she shared raw footage with us and sought our input on the rough cuts, an early stage of the film production.  We may have learned more about documentary filmmaking than they did about lakes.

During initial filming and researching, Allison, MacKinnon, Fischer and Olson would paddle together in packrafts.

Allison: Janet’s hunkering over her laptop and Mark is sending down sensors and I had my camera in hand and I started shooting down on the blue surface of the water—the blueness of that abstract shot was so mesmerizing.

The filmmaker lives near Banff and grew up visiting the lakes.

 Allison: When Janet and Mark approached me with this idea, I hadn’t thought. ‘We’re going to lose the blue.’ I should have known this, but I didn’t; I hadn’t really thought of it. I think that’s part of what’s so compelling about this. There are 5 million visitors a year who come here who also don’t know this is happening.

As researchers, Fischer and Olson are dispassionate about science, but are thrilled that this film uses an artistic approach to reveal the beauty of the lakes and their color.

Fischer: I often tell the story to my students that the very first time that we hiked over the little crest and looked down on Lake Oesa, my eyes filled with tears. I was there to do science, but I was moved by the beauty of it. I think, as scientists, we sometimes push that down, that emotion, that humanity, but these lakes have become like old friends that we can’t wait to see each year.  We love these systems and are grateful to Leanne for making a film that will inspire others to care about their future.