The spatial and temporal variability of droughts over the period 1951–2017 for a portion of Lombardy plain (Northern Italy) was reconstructed starting from a quality-checked and ho-mogenized database of long precipitation and temperature station records covering the study region. The monthly meteorological series were interpolated over the period 1951–2017 onto a 30-arc second resolution grid covering the area by means of an anomaly-based procedure and the gridded fields were used to extract for each cell the series of two standardized drought indices: Standardized Precipitation Index (SPI) and Standardized Precipitation-Evapotranspiration Index (SPEI). SPI and SPEI trend analyses were performed on annual and seasonal scales at both regional and grid-point levels. Theil-Sen test on SPI values highlight-ed a significant drying tendency (Mann-Kendall p-value < 0.05) for summer only (-0.14 dec-ade-1), while SPEI series exhibited a more negative summer trend (-0.22 decade-1) and signif-icant reductions also in spring and annual values (-0.14 and -0.17 decade-1, respectively), suggesting an increase of evapotranspiration rates driven by higher temperature. Moreover, the trend analyses at grid cell level highlighted a greater negative and significant tendency for the western and southern part of the domain. Similar outcomes were obtained by as-sessing the temporal evolution of drought features over the decades in terms of frequency, duration and severity.

Drought variability and trend over the Lombardy plain from meteorological station records / C. Gandolfi, A. Facchi, A. Crespi, M. Rienzner, M. Maugeri (LECTURE NOTES IN CIVIL ENGINEERING). - In: Innovative Biosystems Engineering for Sustainable Agriculture, Forestry and Food Production / [a cura di] A. Coppola, G.C. Di Renzo, G. Altieri, P. D’Antonio. - Prima edizione. - [s.l] : Springer International Publishing, 2020. - ISBN 978-3-030-39298-7. - pp. 39-47 (( convegno International Mid-Term Conference of the Italian Association of Agricultural Engineering 2019 tenutosi a Matera nel 2019.

Drought variability and trend over the Lombardy plain from meteorological station records

Gandolfi C.;Facchi A.;Crespi A.;Rienzner M.;Maugeri M.
2020

Abstract

The spatial and temporal variability of droughts over the period 1951–2017 for a portion of Lombardy plain (Northern Italy) was reconstructed starting from a quality-checked and ho-mogenized database of long precipitation and temperature station records covering the study region. The monthly meteorological series were interpolated over the period 1951–2017 onto a 30-arc second resolution grid covering the area by means of an anomaly-based procedure and the gridded fields were used to extract for each cell the series of two standardized drought indices: Standardized Precipitation Index (SPI) and Standardized Precipitation-Evapotranspiration Index (SPEI). SPI and SPEI trend analyses were performed on annual and seasonal scales at both regional and grid-point levels. Theil-Sen test on SPI values highlight-ed a significant drying tendency (Mann-Kendall p-value < 0.05) for summer only (-0.14 dec-ade-1), while SPEI series exhibited a more negative summer trend (-0.22 decade-1) and signif-icant reductions also in spring and annual values (-0.14 and -0.17 decade-1, respectively), suggesting an increase of evapotranspiration rates driven by higher temperature. Moreover, the trend analyses at grid cell level highlighted a greater negative and significant tendency for the western and southern part of the domain. Similar outcomes were obtained by as-sessing the temporal evolution of drought features over the decades in terms of frequency, duration and severity.
drought, SPI, SPEI, trend analysis, observations
Settore AGR/08 - Idraulica Agraria e Sistemazioni Idraulico-Forestali
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/757930
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