Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania
Managing climate risk in agriculture requires a proper understanding of climatic conditions, regional and global climatic drivers, as well as major agricultural activities at the particular location of interest. Critical analyses of variability and trends in the historical climatic conditions are cr...
| Autores principales: | , , , , , |
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| Formato: | Artículo preliminar |
| Lenguaje: | Inglés |
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CGIAR Research Program on Climate Change, Agriculture and Food Security
2021
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| Acceso en línea: | https://hdl.handle.net/10568/114910 |
| _version_ | 1855534425312329728 |
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| author | Joseph, Jacob Emanuel Rao, Karuturi P.C. Swai, Elirehema Ngwira, Amos R. Rötter, Reimund P. Whitbread, Anthony M. |
| author_browse | Joseph, Jacob Emanuel Ngwira, Amos R. Rao, Karuturi P.C. Rötter, Reimund P. Swai, Elirehema Whitbread, Anthony M. |
| author_facet | Joseph, Jacob Emanuel Rao, Karuturi P.C. Swai, Elirehema Ngwira, Amos R. Rötter, Reimund P. Whitbread, Anthony M. |
| author_sort | Joseph, Jacob Emanuel |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Managing climate risk in agriculture requires a proper understanding of climatic conditions, regional and global climatic drivers, as well as major agricultural activities at the particular location of interest. Critical analyses of variability and trends in the historical climatic conditions are crucial in designing and implementing action plans to improve resilience and reduce the risks of exposure to harsh climatic conditions.
However, in Tanzania, less is known about the variability and trends in the recent climatological conditions. The current study examined variability and trends in rainfall of major agroecological zones in Tanzania (1o - 12oS, 21o - 41oE) using station data from seven locations i.e. Hombolo, Igeri, Ilonga, Naliendele, Mlingano, Tumbi, and Ukiliguru which had records from 1981 to 2020 and two locations i.e. Dodoma and Tanga having records from 1958 to 2020. The variability in annual rainfall was high in Hombolo and Tanga locations (CV ≥ 28%) and low in Igeri (CV = 16%). The OND season showed the highest variability in rainfall (34% to 61%) as compared to the MAM (26% to 36%) and DJFMA (20% to 31%) seasons. We found increasing and decreasing trends in the number of rainy days in Ukiliguru and Tanga respectively, and a decreasing trend in the MAM rainfall in Mlingano. The trends in other locations were statistically insignificant. We assessed the forecast skills of seasonal rainfall forecasts issued by the Tanzania Meteorological Authority (TMA) and IGAD (Intergovernmental Authority on Development) Climate Prediction and Application Center (ICPAC). We found TMA forecasts had higher skills compared to ICPAC forecasts, however, our assessment was limited to MAM and OND seasons due to the unavailability of seasonal forecasts of the DJFMA season issued by ICPAC. Moreover, we showed that Integration of SCF with SSTa increases the reliability of the SCF to 80% at many locations which present an opportunity for better utilization of the SCF in agricultural decision making and better management of climate risks. |
| format | Artículo preliminar |
| id | CGSpace114910 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | CGIAR Research Program on Climate Change, Agriculture and Food Security |
| publisherStr | CGIAR Research Program on Climate Change, Agriculture and Food Security |
| record_format | dspace |
| spelling | CGSpace1149102025-01-27T15:00:52Z Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania Joseph, Jacob Emanuel Rao, Karuturi P.C. Swai, Elirehema Ngwira, Amos R. Rötter, Reimund P. Whitbread, Anthony M. agriculture food security climate change Managing climate risk in agriculture requires a proper understanding of climatic conditions, regional and global climatic drivers, as well as major agricultural activities at the particular location of interest. Critical analyses of variability and trends in the historical climatic conditions are crucial in designing and implementing action plans to improve resilience and reduce the risks of exposure to harsh climatic conditions. However, in Tanzania, less is known about the variability and trends in the recent climatological conditions. The current study examined variability and trends in rainfall of major agroecological zones in Tanzania (1o - 12oS, 21o - 41oE) using station data from seven locations i.e. Hombolo, Igeri, Ilonga, Naliendele, Mlingano, Tumbi, and Ukiliguru which had records from 1981 to 2020 and two locations i.e. Dodoma and Tanga having records from 1958 to 2020. The variability in annual rainfall was high in Hombolo and Tanga locations (CV ≥ 28%) and low in Igeri (CV = 16%). The OND season showed the highest variability in rainfall (34% to 61%) as compared to the MAM (26% to 36%) and DJFMA (20% to 31%) seasons. We found increasing and decreasing trends in the number of rainy days in Ukiliguru and Tanga respectively, and a decreasing trend in the MAM rainfall in Mlingano. The trends in other locations were statistically insignificant. We assessed the forecast skills of seasonal rainfall forecasts issued by the Tanzania Meteorological Authority (TMA) and IGAD (Intergovernmental Authority on Development) Climate Prediction and Application Center (ICPAC). We found TMA forecasts had higher skills compared to ICPAC forecasts, however, our assessment was limited to MAM and OND seasons due to the unavailability of seasonal forecasts of the DJFMA season issued by ICPAC. Moreover, we showed that Integration of SCF with SSTa increases the reliability of the SCF to 80% at many locations which present an opportunity for better utilization of the SCF in agricultural decision making and better management of climate risks. 2021-09-07 2021-09-07T14:48:07Z 2021-09-07T14:48:07Z Working Paper https://hdl.handle.net/10568/114910 en Open Access application/pdf CGIAR Research Program on Climate Change, Agriculture and Food Security Joseph JE, Rao KPC, Ngwira AR, Swai E, Rötter RP, Whitbread AM. 2021. Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania. CCAFS Working Paper no. 363. Wageningen, the Netherlands: CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS) |
| spellingShingle | agriculture food security climate change Joseph, Jacob Emanuel Rao, Karuturi P.C. Swai, Elirehema Ngwira, Amos R. Rötter, Reimund P. Whitbread, Anthony M. Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania |
| title | Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania |
| title_full | Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania |
| title_fullStr | Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania |
| title_full_unstemmed | Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania |
| title_short | Analysis of rainfall variability and trends for better climate risk management in the major agro-ecological zones in Tanzania |
| title_sort | analysis of rainfall variability and trends for better climate risk management in the major agro ecological zones in tanzania |
| topic | agriculture food security climate change |
| url | https://hdl.handle.net/10568/114910 |
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