Drivers of Subseasonal Forecast Errors of the East African Short Rains
The ‘short rains’ in East Africa from October to December have significant year-to-year variability. Their abundance or deficiency is often associated with floods or droughts for which early warning is crucial, though even in normal seasons skillful forecasts facilitate planning and preparedness. He...
| Autores principales: | , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
American Geophysical Union
2021
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| Acceso en línea: | https://hdl.handle.net/10568/114899 |
| _version_ | 1855534523602698240 |
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| author | Kolstad, Erik Wilhelm Macleod, David Demissie, Teferi Dejene |
| author_browse | Demissie, Teferi Dejene Kolstad, Erik Wilhelm Macleod, David |
| author_facet | Kolstad, Erik Wilhelm Macleod, David Demissie, Teferi Dejene |
| author_sort | Kolstad, Erik Wilhelm |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The ‘short rains’ in East Africa from October to December have significant year-to-year variability. Their abundance or deficiency is often associated with floods or droughts for which early warning is crucial, though even in normal seasons skillful forecasts facilitate planning and preparedness. Here we study the relationship between initial-state sea surface temperatures and subseasonal rainfall forecast errors in the European Center for Medium-Range Weather Forecasts model in the region. We demonstrate that the initial mode of the Indian Ocean Dipole (IOD) is a partial control on the rainfall error in weeks 3–4. This relationship is also clear on the seasonal scale, exemplified by too-wet forecasts during the 2015 season when the IOD was positive, and too-dry forecasts in 2010 when it was negative. Our results provide an entry point for model improvement, and we show that a priori forecast corrections based on the initial IOD index are feasible. |
| format | Journal Article |
| id | CGSpace114899 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | American Geophysical Union |
| publisherStr | American Geophysical Union |
| record_format | dspace |
| spelling | CGSpace1148992025-08-15T13:22:34Z Drivers of Subseasonal Forecast Errors of the East African Short Rains Kolstad, Erik Wilhelm Macleod, David Demissie, Teferi Dejene forecasting rain agriculture food security climate change The ‘short rains’ in East Africa from October to December have significant year-to-year variability. Their abundance or deficiency is often associated with floods or droughts for which early warning is crucial, though even in normal seasons skillful forecasts facilitate planning and preparedness. Here we study the relationship between initial-state sea surface temperatures and subseasonal rainfall forecast errors in the European Center for Medium-Range Weather Forecasts model in the region. We demonstrate that the initial mode of the Indian Ocean Dipole (IOD) is a partial control on the rainfall error in weeks 3–4. This relationship is also clear on the seasonal scale, exemplified by too-wet forecasts during the 2015 season when the IOD was positive, and too-dry forecasts in 2010 when it was negative. Our results provide an entry point for model improvement, and we show that a priori forecast corrections based on the initial IOD index are feasible. 2021-07-28 2021-09-07T13:14:42Z 2021-09-07T13:14:42Z Journal Article https://hdl.handle.net/10568/114899 en Open Access American Geophysical Union Kolstad EW, MacLeod D, Demissie TD. 2021. Drivers of Subseasonal Forecast Errors of the East African Short Rains. Geophysical Research Letters 48(14):e2021GL093292.. |
| spellingShingle | forecasting rain agriculture food security climate change Kolstad, Erik Wilhelm Macleod, David Demissie, Teferi Dejene Drivers of Subseasonal Forecast Errors of the East African Short Rains |
| title | Drivers of Subseasonal Forecast Errors of the East African Short Rains |
| title_full | Drivers of Subseasonal Forecast Errors of the East African Short Rains |
| title_fullStr | Drivers of Subseasonal Forecast Errors of the East African Short Rains |
| title_full_unstemmed | Drivers of Subseasonal Forecast Errors of the East African Short Rains |
| title_short | Drivers of Subseasonal Forecast Errors of the East African Short Rains |
| title_sort | drivers of subseasonal forecast errors of the east african short rains |
| topic | forecasting rain agriculture food security climate change |
| url | https://hdl.handle.net/10568/114899 |
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