Results 91 to 100 of about 2,008 (184)

Trends of change in precipitation and in drought susceptibility as assessed by the Standardized Precipitation Index (SPI) in northeast Portugal

Territorium, 2021
As zonas áridas ocupam boa parte do NE Portugal, região de moderada a severa suscetibilidade à desertificação e seca. A análise de tendência da precipitação, isolada e combinada, e do índice de seca SPI foi realizada em seis estações meteorológicas no NE Portugal (representativas dos climas regionais), no período 1931-2000.
Royer, Ana Caroline, Figueiredo, Tomás de, Fonseca, Felícia, Schutz, Fabiana Costa de Araújo, Hernández, Zulimar   +4 more
openaire   +2 more sources

Impacts of Atmospheric and Soil Droughts on Carbon and Water Fluxes in Northern European Coniferous Forests: Evidence From Eddy‐Covariance Data

Global Change Biology, Volume 32, Issue 8, August 2026.
Atmospheric and soil droughts were assessed using the SAMI and SSMI indices at northern European coniferous forest eddy‐covariance (EC) sites, and ecosystem responses were evaluated from EC flux data. The results show that soil droughts have been rare, while air moisture limitations on carbon and water fluxes occur more frequently. Atmospheric droughts
Olli Peltola, Olli‐Pekka Tikkasalo, Jari‐Pekka Nousu, Janne Rinne, Samuli Launiainen   +4 more
wiley   +1 more source

The role of precipitation and irrigation on groundwater droughts in the Piemonte Plain, Italy

Journal of Hydrology: Regional Studies
Study region: Piemonte Plain (upper Po plain), northwestern Italy. Study focus: The relationship between meteorological and groundwater droughts of shallow aquifers is investigated in the Piemonte Plain, characterized by widespread irrigation, mainly ...
Edoardo Ducco, Ilaria Butera, Stefania Tamea   +2 more
doaj   +1 more source

Conserved symbiosis‐associated genes in the cycad Encephalartos natalensis suggest co‐option for cyanobacterial symbiosis

New Phytologist, Volume 251, Issue 4, Page 2168-2185, August 2026.
The heterocyst‐rich Encephalartos natalensis cyanobacterial zone in coralloid root suggests co‐option of conserved symbiosis‐associated genes. This figure was created in BioRender (BioRender.com/https://BioRender.com/n3qveqc). Summary Plant‐cyanobacterial symbioses have evolved independently at least four times across land plants, yet their underlying ...
Cassandra Schoeman, Danielle Roodt, Amy Mc Menamin, Oliver Bezuidt, Choaro Dithugoe, Desré Pinard, Eshchar Mizrachi   +6 more
wiley   +1 more source

Spatially Heterogeneous Impacts of Urbanization in Reshaping the Dry and Hot Extremes Across Chinese Cities

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Escalating climatic hazards have posed considerable challenges to urban resilience and sustainable development. By integrating national‐scale meteorological data, this research elucidates how urbanization reshapes the dry and hot extremes across China at various temporal scales and within a regional framework.
Hui Zhang, Mengmeng Li, Xinyang Li, Yuting Lu, Xin Huang, Tijian Wang   +5 more
wiley   +1 more source

Further Improvements to classical standard precipitation index (SPI) calculations

Abstract Global warming coupled climate change impacts show their end results in the form of extreme events including floods and droughts. Droughts are creeping phenomena and their prediction is more related to precipitation events and in many parts of the world droughts occurrences become temporally and spatially effective.
openaire   +1 more source

A Study on Drought Analysis Using Time Series, Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) in Bursa Region

, 2022
All agricultural activities are directly related to the climate. In recent years, temperature increases and changes in precipitation regimes adversely affect the Mediterranean Basin, including Türkiye. While increasing temperatures and irregular precipitation rise the need for irrigation in crop production in some regions, excessive and irregular ...
Gündoğdu, Kemal Sulhi, Arıkan Uysal, Gülce   +1 more
openaire   +1 more source

Comparative Analysis of Trend Models for Standardized Precipitation Index (SPI) Data for Çanakkale

Türk Tarım ve Doğa Bilimleri Dergisi
Understanding precipitation trends is critical for assessing climate change and its impacts on water resources, and disaster preparedness. In this study it was aimed to analyzes the long-term trends of the Standardized Precipitation Index (SPI) for Çanakkale. The precipitation data from a period of 1929 to 2023 was used.
Nazlı Çiçek Söylemez, Ünal Kızıl
openaire   +1 more source

DROUGHT FORECAST USING ARIMA MODEL FOR THE STANDARDIZED PRECIPITATION INDEX (SPI) AND PRECIPITATION DATA

INTERNATIONAL JOURNAL OF CIVIL ENGINEERING AND TECHNOLOGY (IJCIET), 2021
Eman A Elnikhely, Saleh O. K., Amr M El Dakak   +2 more
openaire   +1 more source

How to compute and visualize the Standardized Precipitation Index (SPI) for drought analysis

The Standardized Precipitation Index (SPI) quantifies how precipitation deviates from the historical average over multiple time scales (e.g., from 1 to 12 months), allowing for consistent monitoring of droughts and floods across regions and time, making it a valuable tool for early warning and risk assessment systems.
openaire   +1 more source