The June 2021 issue of “Colorado Water” is hot off the presses from #Colorado State University #ClimateChange

Brad Udall: Here’s the latest version of my 4-Panel plot thru Water Year (Oct-Sep) of 2019 of the #coriver big reservoirs, natural flows, precipitation, and temperature. Data goes back or 1906 (or 1935 for reservoirs.) This updates previous work with @GreatLakesPeck

Click here to read the issue. Here’s an excerpt:

Since the 1970s, scientists have been interested in how runoff in the Colorado River Basin (CR Basin) would change as the climate warms. Many of these studies strongly suggested that the Colorado River (CR) would lose flow
with warming, but in the last few years, scientists have been able to analyze a de- clining 22-year flow record, the ongoing 2000-2021 “Millennium Drought”. Multiple studies since 2016 have now found human fingerprints on the nearly 20% loss in flow since 2000 and attribute up to half of that loss to the approximately 1.2°C or more warming that has occurred during the last century. This article summarizes six key peer-reviewed studies related to the topic of CR flow loss. These studies have found declines in runoff efficiency, investigated the causes of flow loss, and in some cases made projections about future flow declines based on the 21st-century climate model projected temperatures.

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