Anyone who is paying attention to the state of our winters knows that they are getting more erratic. Often they start later (it’s a rare thing to ski on natural snow on opening weekend) and subject to more rain events, with big impacts on snow pack. While our climatic patterns go through natural wetter and drier cycles, climate science tells us that these patters will become more extreme, with less overall snow and shorter seasons.
Anecdotes and personal experience are one thing. But when did the snow pack actually start to decline?
While all resorts track snowfall, the benchmark of snowfall in Australia over time comes from Spencers Creek, at a site at 1,800 metres above sea level, in the Main Range of the Snowy Mountains. The following article comes from ABC Rural and gives a sense of the decades worth of data that is available from this site, and the process of getting the data. The measuring site was originally established to give the Snowy Hydro managers a sense of what water was trapped in the snow pack and hence how much water would be released in the spring. As skiers and riders, what it gives us is a long term summary of the trends in snowpack over the past six decades.
The take home message is that, overall, snowpack has been declining for decades and unabated climate change will make that worse. While the article does not drill into this issue in detail, previous analysis of this data by Terry Giesecke suggests that:
“There has been a downwards trend (in snow pack) from 1957 to 1989. It then goes up dramatically for about four years, before resuming a downwards path”. This research suggests that the increase in snow depth between 1990 and 1994 could have been due to global cooling which occurred as a result of major volcanic activity in the Philippines in 1991. Using data collected up until 2016, it also notes:
“There is evidence of further decline in the first 16 years of the 21st century.”
The full article is below.
Continue reading “Australian snow pack in decline since 1957”