Agrometeorology

 

 

Discrepancy between reference evapotranspiration and actual evapotranspiration as an indicator of water deficit 

Examples of Romania, Bucovina and Slovenia, Nova Gorica for years 2020 and 2013

Evapotranspiration plays a crucial role in the recycling of precipitation, in soil water availability and consequently on food production. It depends mainly on the solar energy available to vaporize the water, on water content in the soil layers and on land cover types (like vegetation, open water, bare soil, etc.).

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Drought in SE Europe in August 2020

FVC anomaly as an indicator of drought in Romania

Fraction of vegetation cover (FVC, LSA-421; https://landsaf.ipma.pt/en/products/vegetation/fvc/) is a vegetation product based on multi-channel remote sensing measurements derived from Meteosat geostationary satellite. It gives information on the fraction of ground unit area covered by green vegetation, which is relevant for applications in agriculture, forestry, environmental management and land use. It has also proved to be useful for drought monitoring.

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Monitoring of Vegetation Condition

Example of drought detection by combining precipitation, vegetation indices and satellite derived evapotranspiration

Drought is a recurring climate feature that results from water deficit (precipitation, surface water or groundwater) over an extended period. Meteorological drought usually precedes other types of droughts and occurs when there is a prolonged time with less than average precipitation. Agricultural drought develops when meteorological drought leads...

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Vegetation Response Variability from Meteosat

How do land and climate type as well as irrigation affect vegetation signal from space?

Fraction of vegetation cover (FVC) represents the fraction of green vegetation covering a unit area of horizontal soil. Vegetation signal from space depends on various factors, such as growing season, water availability and vegetation type. Yearly evolution of LSA SAF FVC from the Meteosat satellite...

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Satellite Derived Evapotranspiration is Advantageous for Drought Detection

Analysing Drought Impact by Combining Evapotranspiration and Vegetation Signal

A combination of satellite derived evapotranspiration and vegetation signal improves locating and analysing drought affected areas. In the scope of drought monitoring, satellite vegetation signal, e.g., fraction of vegetation cover is a very reliable indicator of vegetation health....

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Seasonal Cycle in the Nile Valley and Delta

Satellite Monitoring of Agriculture in the Breadbasket of Egypt

The Nile valley and delta are among the first places where agriculture and civilisation came into existence. The Nile water flow with the largest inflow in the summer, because of the rainy season in the Ethiopian Highlands, supports irrigation in an otherwise very barren region (away from the Mediterranean coast the interior of Egypt has one of the driest climates in the world with precipitation barely above zero).

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Assessing Frost Exposure On Vegetation

Identifying spring frost areas with Land Surface Temperature from Meteosat

A prolonged period of warmer-than-average weather over Europe in March and first half of April 2017 came to a halt after polar air mass rapidly moved southwards from N/NE of the continent. This event resulted in one of the worst frost damage in recent years. It affected vegetation, which was already in bloom over larger areas of Central, Western and Eastern Europe. Particularly hard-hit were areas with fruit cultivation, e.g., apples, grapes, pears and cherries...

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Vegetation Monitoring and Locating Drought Impacted Areas

Fraction of vegetation cover indicates the current state of vegetation

Fraction of vegetation cover (FVC) represents the fraction of green vegetation covering a unit area and is very helpful for monitoring the current state of vegetation. LSA SAF FVC over Europe in summer 2017 is shown together with differences from the reference state of vegetation over the same summer period...

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