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Use of conventional and satellite data for estimation of evapotranspiration spatial and temporal pattern

Struzik P., Kępińska-Kasprzak M.

Meteorology Hydrology and Water Management. Research and Operational Applications

2016

Vol. 4, iss. 2

3--13

Evapotranspiration values (ET) are crucial for agriculture where estimates of water reserves available for crops are the basis for scheduling the time and intensity of irrigation, yield prognoses, etc. Detailed evapotranspiration data are, therefore, of essential value. However, stations performing direct measurements of evapotranspiration are very scarcely distributed in Poland, and for this reason the interpolation of data is necessarily biased. Hence, evapotranspiration values are calculated using indirect methods (usually empirical formulas). Data from geostationary meteorological satellites are used operationally for the determination of evapotranspiration with good spatial and temporal resolution (e.g. Land-SA F product). The study of the relation between evapotranspiration values determined with the use of satellite data and those calculated using the Penman-Monteith formula was performed for the study area in Poland. Daily values and cumulated (i.e. decadal, monthly and yearly) values were analysed to determine the quality and possible added value of the satellite product. The relation between the reference ET and actual ET in two consecutive years was discussed, both for the whole test area and for individual stations, taking into account land use and possible water deficit in the root zone, represented by H-SA F (EUMETSA T Satellite Application facility supporting Operational Hydrology and Water Management) soil wetness index product. The differences are presented and discussed.

Informacja z satelitów meteorologicznych w stanach zagrożeń naturalnych

Struzik P.

Roczniki Geomatyki

2006

T. 4, z. 1

137-144

The paper presents possibilities for monitoring current state of atmosphere and Earth surface, thanks to information from meteorological satellites recorded by Krakow Branch Office of the Institute of Meteorology and Water Management. Such an information is operationally used by hydrological and meteorological forecasting offices, among other purposes for early detection of of natural hazards. Fast development of meteorological satellite data processing and interpretation technology allows for use of that information in disater analysis and monitoring. High temporal resolution of registered data (15 min) and satellite information processing and interpretation methods developed at the IMWM are of basic importance for the use of those data in emergency situations. The IMWM operationally use satellite information from: METEOSAT, NOAA and Feng Yun satellite systems. Special attention is paid to such use of the information as detection of storm initiation area and storm development monitoring, rainfall intensity and range, snow and ice covered area, vegetation state and its anomalies related to drought, fires, floods and human activity. Another important issue in the nuclear threat era is possibility to monitor directions of long-distant contamination transport (including radioactive) into mid/upper troposphere and stratosphere. Current possibilities and limitations of satellite information use were also presented.