Flash drought in Australia and its relationship to evaporative demand
Flash droughts can be distinguished by rapid intensification from near-normal soil moisture to drought conditions in a matter of weeks. Here, we provide the first characterisation of a climatology of flash drought across Australia using a suite of indices. The experiment is designed to capture a ran...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | Environmental Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1748-9326/abfe2c |
| _version_ | 1797747644957720576 |
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| author | Tess Parker Ailie Gallant Mike Hobbins David Hoffmann |
| author_facet | Tess Parker Ailie Gallant Mike Hobbins David Hoffmann |
| author_sort | Tess Parker |
| collection | DOAJ |
| description | Flash droughts can be distinguished by rapid intensification from near-normal soil moisture to drought conditions in a matter of weeks. Here, we provide the first characterisation of a climatology of flash drought across Australia using a suite of indices. The experiment is designed to capture a range of conditions related to drought: evaporative demand describes the atmospheric demand for moisture from the surface; precipitation, the supply of moisture from the atmosphere to the surface; and evaporative stress, the supply of moisture from the surface relative to the demand from the atmosphere. We show that regardless of the definition, flash droughts occur in all seasons. They can terminate as rapidly as they start, but in some cases can last many months, resulting in a seasonal-scale drought. We show that flash-drought variability and its prevalence can be related to phases of the El Niño–Southern Oscillation, highlighting scope for seasonal-scale prediction. Using a case study in southeast Australia, we show that monitoring precipitation is less useful for capturing the onset of flash drought as it occurs. Instead, indices like the Evaporative Demand Drought Index and Evaporative Stress Index are more useful for monitoring flash-drought development. |
| first_indexed | 2024-03-12T15:54:16Z |
| format | Article |
| id | doaj.art-2f2c7b0692ff42afbfc83efea2518230 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T15:54:16Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-2f2c7b0692ff42afbfc83efea25182302023-08-09T15:00:03ZengIOP PublishingEnvironmental Research Letters1748-93262021-01-0116606403310.1088/1748-9326/abfe2cFlash drought in Australia and its relationship to evaporative demandTess Parker0https://orcid.org/0000-0003-4201-3929Ailie Gallant1https://orcid.org/0000-0002-7917-1069Mike Hobbins2https://orcid.org/0000-0001-5540-8466David Hoffmann3https://orcid.org/0000-0001-5368-1223School of Earth, Atmosphere and Environment , Monash University, Clayton, Victoria, AustraliaSchool of Earth, Atmosphere and Environment , Monash University, Clayton, Victoria, AustraliaCooperative Institute for Research in Environmental Sciences, University of Colorado , Boulder, CO, United States of America; NOAA Physical Sciences Laboratory , Boulder, CO, United States of AmericaSchool of Earth, Atmosphere and Environment , Monash University, Clayton, Victoria, AustraliaFlash droughts can be distinguished by rapid intensification from near-normal soil moisture to drought conditions in a matter of weeks. Here, we provide the first characterisation of a climatology of flash drought across Australia using a suite of indices. The experiment is designed to capture a range of conditions related to drought: evaporative demand describes the atmospheric demand for moisture from the surface; precipitation, the supply of moisture from the atmosphere to the surface; and evaporative stress, the supply of moisture from the surface relative to the demand from the atmosphere. We show that regardless of the definition, flash droughts occur in all seasons. They can terminate as rapidly as they start, but in some cases can last many months, resulting in a seasonal-scale drought. We show that flash-drought variability and its prevalence can be related to phases of the El Niño–Southern Oscillation, highlighting scope for seasonal-scale prediction. Using a case study in southeast Australia, we show that monitoring precipitation is less useful for capturing the onset of flash drought as it occurs. Instead, indices like the Evaporative Demand Drought Index and Evaporative Stress Index are more useful for monitoring flash-drought development.https://doi.org/10.1088/1748-9326/abfe2cflash droughtAustraliaEvaporative Demand Drought Index |
| spellingShingle | Tess Parker Ailie Gallant Mike Hobbins David Hoffmann Flash drought in Australia and its relationship to evaporative demand Environmental Research Letters flash drought Australia Evaporative Demand Drought Index |
| title | Flash drought in Australia and its relationship to evaporative demand |
| title_full | Flash drought in Australia and its relationship to evaporative demand |
| title_fullStr | Flash drought in Australia and its relationship to evaporative demand |
| title_full_unstemmed | Flash drought in Australia and its relationship to evaporative demand |
| title_short | Flash drought in Australia and its relationship to evaporative demand |
| title_sort | flash drought in australia and its relationship to evaporative demand |
| topic | flash drought Australia Evaporative Demand Drought Index |
| url | https://doi.org/10.1088/1748-9326/abfe2c |
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