noaa-recon-22070 Upper Rio Grande 445 Year Runoff Efficiency Reconstructions Lehner, F.; Wahl, E.R.; Wood, A.W.; Blatchford, D.B.; Llewellyn, D. Upper Rio Grande 445 Year Runoff Efficiency Reconstructions 2017-05-09 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22070 Investigator F. Lehner Investigator E.R. Wahl Investigator A.W. Wood Investigator D.B. Blatchford Investigator D. Llewellyn earth science paleoclimate climate reconstructions|tree ring age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring streamflow,null,ensemble member,acre foot,annual,climate reconstructions|tree ring,null,null,N,units are 1000s of acre feet earth science paleoclimate climate reconstructions|tree ring runoff coefficient,null,ensemble member,dimensionless,annual,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring precipitation,null,ensemble member,acre foot,annual,climate reconstructions|tree ring,null,null,N,units are 1000s of acre feet earth science paleoclimate reconstructions streamflow earth science paleoclimate reconstructions precipitation geoscientificInformation Precipitation Reconstruction Streamflow Reconstruction 1571 AD 2015 AD 379 cal yr BP -65 cal yr BP Complete 35.8747 35.8747 -106.1414 -106.1414 Continent North America United States Of America New Mexico Otowi Bridge>LATITUDE 35.8747>LONGITUDE -106.1414 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Flavio Lehner, Eugene R. Wahl, Andrew W. Wood, Douglas B. Blatchford, Dagmar Llewellyn 2017 Geophysical Research Letters 10.1002/2017GL073253

Recent decades have seen strong trends in hydroclimate over the American Southwest, with major river basins such as the Rio Grande exhibiting intermittent drought and declining runoff efficiencies. The extent to which these observed trends are exceptional has implications for current water management and seasonal streamflow forecasting practices. We present a new reconstruction of runoff ratio for the Upper Rio Grande basin back to 1571 CE, which provides evidence that the declining trend in runoff ratio from the 1980s to present-day is unprecedented in context of the last 445 years. Though runoff ratio is found to vary primarily in proportion to precipitation, the reconstructions suggest a secondary influence of temperature. In years of low precipitation, very low runoff ratios are made 2.5-3 times more likely by high temperatures. This temperature sensitivity appears to have strengthened in recent decades, implying future water management vulnerability should recent warming trends in the region continue. STUDY NOTES: Tree-ring based ensemble reconstructions of upper Rio Grande streamflow, precipitation, and runoff efficiency at Otowi Bridge, New Mexico, since 1571 CE.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/newmexico/lehner2017riogrande-readme.txt Data Description; Lehner et al. 2017 Readme File GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/newmexico/lehner2017riogrande-precip.txt Comma-delimited Text Data File; 1000 Member Ensemble of Precipitation Reconstructions GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/newmexico/lehner2017riogrande-flow.txt Comma-delimited Text Data File; 1000 Member Ensemble of Streamflow Reconstructions GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/newmexico/lehner2017riogrande-runoff.txt Comma-delimited Text Data File; 1000 Member Ensemble of Runoff Ratio Reconstructions USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11