A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water Demand
Abstract Hydrologic intensity is often quantified using precipitation without directly incorporating atmospheric water demand. We develop a hydrologic intensity index called the surplus deficit intensity (SDI) index that accounts for variation in supply and demand. SDI is the standardized sum of sta...
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| Format: | Article |
| Language: | English |
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Wiley
2019-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2019GL084015 |
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| author | Darren L. Ficklin John T. Abatzoglou Kimberly A. Novick |
| author_facet | Darren L. Ficklin John T. Abatzoglou Kimberly A. Novick |
| author_sort | Darren L. Ficklin |
| collection | DOAJ |
| description | Abstract Hydrologic intensity is often quantified using precipitation without directly incorporating atmospheric water demand. We develop a hydrologic intensity index called the surplus deficit intensity (SDI) index that accounts for variation in supply and demand. SDI is the standardized sum of standardized surplus intensity (mean of daily surplus when supply > demand) and deficit time (mean of consecutive days when demand > supply). Using an observational ensemble of global daily precipitation and atmospheric water demand during 1979–2017, we document widespread hydrologic intensification (SDI; +0.11 z‐score per decade) driven primarily by increased surplus intensity. Using a climate model ensemble of the United States, hydrologic intensification is projected for the mid‐21st century (+0.86 in z‐score compared to 1971–2000), producing greater apparent intensification when compared to an index that does not explicitly incorporate demand. While incorporating demand had a minor effect on observed hydrologic intensification, it doubles hydrological intensification for the mid‐21st century. |
| format | Article |
| id | doaj-art-e940dae617784e99a1572bb04c0c5544 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-e940dae617784e99a1572bb04c0c55442025-08-20T03:10:21ZengWileyGeophysical Research Letters0094-82761944-80072019-07-0146148114812410.1029/2019GL084015A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water DemandDarren L. Ficklin0John T. Abatzoglou1Kimberly A. Novick2Department of Geography Indiana University Bloomington IN USADepartment of Geography University of Idaho Moscow ID USAO'Neill School of Public and Environmental Affairs Indiana University Bloomington IN USAAbstract Hydrologic intensity is often quantified using precipitation without directly incorporating atmospheric water demand. We develop a hydrologic intensity index called the surplus deficit intensity (SDI) index that accounts for variation in supply and demand. SDI is the standardized sum of standardized surplus intensity (mean of daily surplus when supply > demand) and deficit time (mean of consecutive days when demand > supply). Using an observational ensemble of global daily precipitation and atmospheric water demand during 1979–2017, we document widespread hydrologic intensification (SDI; +0.11 z‐score per decade) driven primarily by increased surplus intensity. Using a climate model ensemble of the United States, hydrologic intensification is projected for the mid‐21st century (+0.86 in z‐score compared to 1971–2000), producing greater apparent intensification when compared to an index that does not explicitly incorporate demand. While incorporating demand had a minor effect on observed hydrologic intensification, it doubles hydrological intensification for the mid‐21st century.https://doi.org/10.1029/2019GL084015hydrologic cycleprecipitationevapotranspirationclimate change |
| spellingShingle | Darren L. Ficklin John T. Abatzoglou Kimberly A. Novick A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water Demand Geophysical Research Letters hydrologic cycle precipitation evapotranspiration climate change |
| title | A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water Demand |
| title_full | A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water Demand |
| title_fullStr | A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water Demand |
| title_full_unstemmed | A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water Demand |
| title_short | A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water Demand |
| title_sort | new perspective on terrestrial hydrologic intensity that incorporates atmospheric water demand |
| topic | hydrologic cycle precipitation evapotranspiration climate change |
| url | https://doi.org/10.1029/2019GL084015 |
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