1 / 9

Climate Shifts and Hydroclimatology in Western US: Seasonal Cycle Analysis

Explore changes in spring snowmelt timing over Western US. Analyze elevation, snow water equivalence, temperature, and precipitation data. Study runoff, SWE trends, temperature, and precipitation changes. Findings show earlier runoff in PNW, minimal shifts in Sierras or Rockies; SWE decreases in PNW, northern Rockies; temperature and precipitation rising except in PNW. PNW runoff shift linked to temperature rise and precipitation decline.

markku
Télécharger la présentation

Climate Shifts and Hydroclimatology in Western US: Seasonal Cycle Analysis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Seasonal Cycle Shifts in Hydroclimatology Over the Western US Satish Regonda, Martyn Clark, Balaji Rajagopalan and John Pitlick • Goals • 1. Examine changes in the timing of spring snowmelt • 2. In relation to • a. Elevation • b. Snow water equivalence (SWE) • c. Temperature • d. Precipitation

  2. Data and Methods 1. Streamflow: For each year, compute the day on which 50% of the water-year flow is equaled or exceeded (89 stations)

  3. 2. Trends in April 1 SWE (501 stations) 3. Trends in temperature and precipitation (hundreds of stations)

  4. SUMMARY: • Runoff appears to be occurring earlier in PNW; not much change in the Sierras or Rockies • Change is greatest in low-elevation basins • April 1 SWE is less in PNW, northern Rockies; little change in Sierras or southern Rockies • Temperature appears to be increasing throughout the west. • Precipitation also increasing, except in PNW • Shift in timing of runoff in PNW appears to be related to both an increase in temperature and a decrease in precipitation

More Related