Tag: precipitation

Interview: The Future of Water in a Warmer World

  • Peter H. Gleick, President and co-founder of the Pacific Institute, is concerned that without reducing greenhouse gas emissions, global warming will have dire impact on water resources. (Courtesy of the Pacific Institute)

With concern about climate change growing, some scientists are trying to determine how global warming will affect sources of water. Lester Graham spoke with the President of the Pacific Institute, Peter Gleick about what climate change might mean to weather patterns:

Transcript

With concern about climate change growing, some scientists are trying to determine how global warming will affect sources of water.

Lester Graham spoke with the President of the Pacific Institute, Peter Gleick about what climate change might mean to weather

patterns:


PG: Overall, the planet is gonna get wetter because as it gets hotter, we’ll see more
evaporation. The problem is, we aren’t always gonna get rain where we want it.
Sometimes we’re gonna get rain where we don’t want it. And at the moment it looks like
the biggest increases in rainfall will be in the northern regions where typically water is
less of a problem. Or at least water quantity is less of a problem. And we may actually get
less rainfall in the Southwest where we need it more.


LG: Let’s talk about some of the precious areas to North America. For instance, a lot of
people are worried about snow pack in the Rockies.


PG: Yes, well, one of the most certain impacts of global climate change is going to be
significant changes in snowfall and snowmelt patterns in the western United States as a
whole, actually in the United States as a whole because as it warms up, what falls out of
the atmosphere is going to be rain and not snow. Now that really matters in the Western
United States, in the Rocky Mountains and the Sierra Nevada where our snow pack really
forms the basis of our water supply system. Unfortunately, as the climate is changing,
we’re seeing rising temperatures and decreasing snow pack. More of what falls in the
mountains is falling as rain, less of it’s going to be snow. That’s going to wreck havoc on
our management system, the reservoirs that we’ve built to deal with these variations in
climate. Incidentally, it’s also going to ruin the ski season eventually.


LG: You mentioned that the farther north you go, according to some models, we’ll see
more rain or more precipitation. At the same time, with warmer temperatures, we’ll see
less ice covering some of the inland lakes, such as the Great Lakes, which means more
evaporation. So, what are we going to see as far as those surface waters sources across
the continent?


PG: Without a doubt, global climate is changing. And it’s going to get worse and worse
as humans put more and more greenhouse gases in the atmosphere. And as it gets
warmer, we’re going to see more evaporation off of the surface of all kinds of lakes,
including especially the Great Lakes. And interestingly, even though we don’t have a
great degree of confidence of what’s going to happen precisely with precipitation in the
Great Lakes, all of the models seem to agree that over time, the Great Lakes levels are
going to drop. And it looks like we’re going to lose more water out of the surface of the
Great Lakes from increased evaporation off the lakes than we’re likely to get from
precipitation, even if precipitation goes up somewhat. And I think that’s a great worry for
homeowners and industry around the margin of the lake. Ultimately for navigation,
ultimately for water supply.


LG: There’s a lot of talk about the gloom and doom scenarios of global warming, but
they’ll be longer growing seasons and we’re also going to be seeing, as the zones change,
more of this fertile ground in as northern US and Canada get longer growing seasons.
That’s not a bad thing.


PG: There are going to be winners and loser from global climate change. And
interestingly, there are going to be winners and losers at different times. Certainly, a
longer growing season is a possibility as it warms up. And I think that, in the short term,
could prove to be beneficial for certain agriculture in certain regions. Interestingly
though, and perhaps a little depressingly, over time, if the globe continues to warm up, if
the globe continues to warm up, evidence suggest that the short term improvements in
agriculture that we might see might ultimately be wiped out. As it gets hotter and hotter,
some crop yields will go down after they go up. We’re going to see an increase in pests
that we didn’t used to see because of warmer weather. Unfortunately, pests like warmer
weather. Furthermore, if we don’t really get a handle on greenhouse gas emissions, if we
don’t really start to cut the severity of the climate changes that we’re going to see, the
doom and gloom scenarios unfortunately get more likely. Over time, the temperatures go
up not just one or two or three degrees Celsius but four or five or eight degree Celsius.
And that truly is a catastrophe for the kind of systems we’ve set up around the planet.


HOST TAG: Peter Gleick is a water expert and President of the Pacific Institute for Studies in Development, Environment and Security, based in California.

Related Links

Air Pollution Officials Debate Clear Skies Initiative

An EPA study says that less than one percent of lakes in the Upper Midwest suffer from the effects of acid rain – down from three percent 20 years ago. Air pollution officials disagree on what to do next about the harmful precipitation. The Great Lakes Radio Consortium’s Chuck Quirmbach reports:

Transcript

An EPA study says that less than one percent of lakes in the Upper Midwest suffer from the
effects of acid rain – down from three percent 20 years ago. Air pollution officials disagree on
what to do next about the harmful precipitation. The Great Lakes Radio Consortium’s Chuck
Quirmbach reports:


The EPA credits the improvement in the health of lakes to a 1990 law that reduced sulphur
dioxide emissions, mainly from coal-burning power plants. Cutting SO2 pollution means several
things, including less disruption to the Lakes’ food chain. Now the EPA agrees with President
Bush’s call for Congress to pass his so-called Clear Skies Initiative. That plan aims for more
reductions in sulphur dioxide, as well as cuts in emissions of nitrogen oxides and mercury. But
several state air pollution regulators say the plan doesn’t go far enough. Lloyd Eagan is with the
Wisconsin Department of Natural Resources.


“Basically my feeling is that the levels in the Clear Skies Initiative really offer too little reduction
and it comes too late.”


But the EPA calls the Clear Skies Initiative a market-based, workable approach to pollution
control.


For the Great Lakes Radio Consortium, this is Chuck Quirmbach reporting.

Conjecture Continues on Water Levels

Whether Great Lakes water levels are expected to improve this summer depends on who you ask. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

Whether Great Lakes water levels are expected to improve this summer depends on who you ask. The Great Lakes Radio Consortium’s Lester Graham reports:

The average water levels of the Great Lakes have dropped about four feet in the last four years. The Army Corps of Engineers says with heavy snowfall in March and heavy rains in recent weeks in some parts of the basin, the Corps is expecting some improvement in those levels. But a meteorologist concedes that the Corps predictions disagree with those of the National Oceanic and Atmospheric Administration. Cynthia Sellinger is a hydrologist with NOAA. She says because of warmer than normal weather, much of the precipitation evaporated instead of running off into the lakes.

“Without a good spring run-off which gives us our seasonal rise, the lakes will be either at last year’s level or slightly lower.”

And NOAA says for the next three months the Great Lakes basin can expect average precipitation and that won’t help the lakes replenish themselves.

For the Great Lakes Radio Consortium, this is Lester Graham.

Winter’s Effect on Lake Levels Debated

There seems to be some confusion over how the mild winter will affect lake levels. The Great Lakes Radio Consortium’s Amy Cavalier has the story:

Monitoring System on Hand for Bioterrorism

Scientists who monitor pollutants in rain and snow in the U.S. are offering their monitoring network to be used in the event of a wide scale bioterrorist attack. The Great Lakes Radio Consortium’s David Sommerstein has more:

Transcript

Scientists who monitor pollutants in rain and snow in the U.S. and Great Lakes are offering their monitoring network to be used in the event of a wide scale bioterrorist attack. The Great Lakes Radio Consortium’s David Sommerstein has more.


The National Atmospheric Deposition Program is best known for its early detection of acid rain in the 1970s. It has a network of over 200 sites that measure chemicals like sulfur dioxides and mercury in precipitation. But coordinator Van Bowersox says the network could also be used in the case of an environmental emergency to trace things like anthrax spore.


“To help track perhaps the source of the material or perhaps just how wide dispersed the material may be. So this would be, for example, for a widespread release of a bioterrorism agent over a broad area.”


Bowersox says the samples of such agents would be sent to a special laboratory for analysis.


The idea wouldn’t be an unprecedented use for the network. The NADP surveyed the nation’s atmosphere for nucleotides following the Chernobyl nuclear disaster. It also measured the amount of particles in the air after the eruption of Mount St. Helens.


For the Great Lakes Radio Consortium, I’m David Sommerstein.

Lake Levels Scrape Bottom

Much of the industry in the nation’s mid-section relies on
shipments of raw materials on the Great Lakes. Great Lakes ports in the
U-S and Canada handle more than 200-million tons of material annually.
The Lakes are also a source of water and recreation for nearly a third
of
the nation’s population. But, during the last two years, water levels
have
been falling at a record breaking pace. The Great Lakes Radio
Consortium’s Lester Graham reports: