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Climate Models Versus Weather Models: Different Approaches for Different Needs

Thursday, October 7, 2010

If you live in the Southwest, no doubt you know a little bit about our weather. It's interesting here. You likely know we have a monsoon during the summer, with awesome thunderstorms and flash floods, and our wettest winters and biggest floods happen when there's an El Niño event. We've also been hearing a lot about global climate change - and there's already a lot of evidence that it's happening here now. One big question is: how will our monsoon change in the future? (Read More)

What’s Ahead for the Climate of the Southwest?

Friday, September 10, 2010

Recently, a colleague (Brad Udall, University of Colorado) and I wrote a short overview of climate change in the West—based on peer-reviewed literature—that appeared in the journal Science (Overpeck and Udall, 2010). The big story is really in the Southwest. What follows here is a summary of our findings. (read more)

Keeping Pace with Warming—Can Plants and Animals Move Fast Enough?

Tuesday, July 6, 2010

After reading a climate modeling paper in the journal Nature that discusses the speed of warming in different ecosystems, I wanted to hear how plants were moving in response to a changing climate from someone with their boots on the ground. The Nature paper “The Velocity of Climate Change,” published in December 2009, stated that plants and animals that require a narrow temperature range to live will be forced to migrate in order to remain in the same climate in which they evolved. Those that can keep pace with climate change will adapt. Those that cannot will likely perish (Read More). 

Species Redistribution

Wednesday, January 9, 2019
 

In the Southwest, the most widespread example of species redistribution is the movement of woody plants like creosote bushes and mesquite trees into native grasslands. The spread of invasive species is also considered a form of species redistribution. These changes occur due to long-term environmental changes like climate change, short-term environmental disturbances like drought or fire, or human-induced land use changes like ranching. Research indicates species ranges are shifting on global and regional levels, towards the poles and upwards in elevation. (Learn more)

Agriculture

Saturday, November 15, 2008

http://southwestclimatechange.org/impacts/water/groundwater

More than 35 percent of Arizona’s land and almost 60 percent of New Mexico’s land is used for farming and ranching. Thus climate change-related impacts on the Southwest landscape will most likely have significant impacts on the Southwest’s agricultural sectors. Changes in water availability, vegetation cover, carbon dioxide levels, and frequency of extreme events like flood, drought, or frost will impact crop and forage production, increasing costs for both producers and consumers. (read more)

Water Supply

Tuesday, October 21, 2008

For five consecutive years, drought in the Upper Colorado River Basin limited the water flow into Lake Powell to no more than 62 percent of the historical average. In 2004, the mammoth reservoir was only one-third full. This precipitous decline in water storage highlighted the vulnerability of the resource to the confluence of climate and societal demand. 

(read more)

 

 

Mountain Snowpack in the West and Southwest

Monday, September 15, 2008

In the West, as much as 70 percent of the region’s precipitation falls during winter. Arizona and New Mexico are critically dependant on this winter precipitation. The region’s two main water lifelines, the Colorado River and the Rio Grande, tap the winter snows in the Rocky Mountains for approximately 70 percent of their annual water flow. (Read more)

Streamflow: Natural Variability and Human-Caused Changes

Monday, September 15, 2008

Current observations suggest that climate change is altering streamflows in ways that negatively impact water supply for southwestern populations. Many climate models suggest that these changes will worsen as the climate warms, accentuating the natural variability inherent in river flows.

Since water is one of the most vital resources in the arid Southwest, the consequences of reduced streamflows and changes in the timing of peak river flows will impact water consumption, agriculture production, economic growth, recreation opportunities, and electricity generation, among other vital services. (Find out more)

Groundwater in the Arid Southwest

Monday, September 15, 2008

Groundwater provides drinking water to urban and rural communities and supports agriculture and industry, all of which have helped enable rapid population growth in Arizona and New Mexico. Population expansion, however, has not been without its consequences. It has led to increasing groundwater withdrawals that are outpacing the rate at which the vital resource is naturally replenished. As a result, the region’s groundwater resources are among the most overused in the United States (continue reading). 

Human Health

Monday, September 15, 2008

 

Health risks are linked to climate change through direct and indirect cause-and-effect chains, and depend on factors such as a person’s age, health condition, economic status, access to quality healthcare programs, and exposure to the elements. In the Southwest, regional health risks linked to climate change include extreme heat conditions, poor air quality, and increased food-, water-, fungal- and animal-borne diseases (Read More).

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