Hydrologist Katrina Bennett describes extreme weather events like droughts and floods as the way that human societies experience climate change. These events are immediately noticeable and can have rippling impacts, including economic repercussions. These events will become more frequent and intense amid climate change, according to a paper Bennett published in the journal Water on April 1. Bennett’s co-authors include Carl Talsma and Riccardo Boero, who also work at Los Alamos National Laboratories. The study highlights the need to look at the extreme events together.
High above south-central New Mexico, satellite imagery shows a brown sea in arid Socorro County, broken up only by the Rio Grande, which splits the county and the state down the middle. Here in the northern reaches of the Chihuahuan Desert, it rains maybe 10 inches annually and the sun shines brightly 280 days a year. Zoom in a little closer near a town called San Antonio and the scene remains barren. Seventy-six years ago the U.S. government decided to test its first nuclear bomb here at the Trinity Site, about an hour’s drive from downtown. New Mexico’s yearly snowpack is trending down, along with overall precipitation, as the climate gets more trying for farmers.
It’s not just your imagination: Things really are greener around New Mexico this year. And the state Legislature’s interim Water and Natural Resources Committee heard the good news in an update from State Climatologist Dr. David DuBois. “We’ve done really well (for) this time of year,” DuBois told the committee. Not only has this water year, which begins on Oct. 1, been well above average, the temperatures have also been cooler than in the past few years, which also helps with the water situation.
This week we have a story about a new study in Nature that shows the “fingerprints” of climate change on 20th century drying. Next week, we’ll look at what some local governments in New Mexico are doing to prepare people for the continued impacts of warming. • There are two other recent studies worth checking out, including one in Nature about the risks of hydroclimate regime shifts in the western United States and another in Earth’s Future, published by the American Geological Union, about adaptation to water shortages caused by population growth and climate change. • Rebecca Moss with the Santa Fe New Mexican reports on the lack of progress on safety concerns at Los Alamos National Laboratory. • The Carlsbad Current Argus’s Adrien Hedden reports on New Mexico State Land Commissioner Stephanie Garcia Richard’s executive order to create a “buffer zone” around Chaco Canyon. The order enacts a moratorium on oil and gas leasing on 72,776 acres of state trust lands in the area. • Writing for High Country News, Nick Bowlin covers a judge’s ruling that reinstates the valuation rule, which the Trump administration repealed. We wrote about those changes in 2017, after the first time a judge ruled that the U.S. broke the law when “updating” how royalties are calculated on federal and tribal lands.
Most New Mexicans understand that climate change is already happening and that its impacts will continue into the future. Now, a new study published in Nature reveals signs of human-caused climate change in the past, too. Relying upon computer models and long-term global observations, the peer-reviewed study shows the “fingerprint” of drought due to warming from greenhouse gas emissions in the early twentieth century. The researchers identified three distinct periods within their climate models: 1981 to present, 1950 to 1975 and 1900 to 1949. In that initial time period, during the first half of the twentieth century, “a signal of greenhouse gas-forced change is robustly detectable,” they write.
Recent storms packed the mountains of southern Colorado and northern New Mexico with healthy snow levels, and meteorologists anticipate El Niño conditions will persist through the spring. This is welcome news after last year’s dry conditions. But in the long term, forecasters and farmers still remain cautious. That’s because long-term drought has dried out the state’s soils. And reservoirs remain low, particularly on the Rio Grande and its tributary, the Chama River.
The Four Corners is at the epicenter of drought in the continental United States, even as conditions in other parts of the Southwest improve. “The Four Corners is getting further and further behind in precipitation,” said Royce Fontenot, senior hydrologist for the National Weather Service in Albuquerque, during a briefing Thursday by the National Oceanic and Atmospheric Administration’s (NOAA) National Integrated Drought Information System. “That’s had a huge impact on local water supplies, particularly local municipal water supplies in the Four Corners.”
He noted, “Almost all the reservoirs through the intermountain West are below normal for where they should be this year.”
Two of the worst-hit systems, he said, are the Rio Grande and the San Juan River, a tributary of the Colorado River. But the Chama, Jemez, San Francisco and Gila rivers in New Mexico are also lower than normal for this time of year. In southern New Mexico, Elephant Butte Reservoir on the Rio Grande has bumped up a bit from earlier this fall—but is still only at about six percent capacity.
The next governor of New Mexico needs to understand climate change—its cause, the immediate and far-reaching impacts to our state and the need for substantive action. We’re far past a time when denial or doubt can be indulged. Today, there’s not even time for rhetoric or vague promises. In early October, the Intergovernmental Panel on Climate Change reported that humans must drastically reduce greenhouse gas emissions in the next decade. Failing to do so means failing to hold warming below levels that will have catastrophic and irreversible impacts upon the Earth’s ecosystems.
Globally, the temperature—averaged between land and sea temperatures—has already risen 1° Celsius, or 1.8° Fahrenheit, since 1880.
Wednesday night, New Mexico’s largest water utility agreed to sell water to the federal government to boost flows in the Rio Grande through the end of the year. Under the one-time lease, the U.S. Bureau of Reclamation will pay the Albuquerque Bernalillo County Water Utility Authority $2 million for 20,000 acre feet of water stored in Abiquiu Reservoir. The water will be used to keep the river flowing from below Cochiti Dam, through Albuquerque and downstream of the Isleta Diversion Dam. During the meeting, John Stomp, chief operating officer of the water authority, assured board members it has that water to spare. “The reason we’re able to do this is we have managed our supplies really well in the past,” Stomp said.
Anyone who is paying attention to the Rio Grande’s drying riverbed and dropping reservoirs or is worried about declining groundwater levels probably has something to say about how the state might handle current—and coming—challenges. And they currently have their chance. The public comment period for New Mexico’s draft water plan ends next week. And while top state officials wouldn’t speak about the plan, New Mexico’s gubernatorial candidates were eager to share their thoughts about water, drought and water planning in the state. The draft plan released earlier this year by the New Mexico Interstate Stream Commission examines statewide water issues through the lens of 16 regional water plans the ISC developed with input from local governments, nonprofits and stakeholders.