The Link Between Snow Cover Characteristics and Drought Propagation Processes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00020699%3A_____%2F17%3AN0000046" target="_blank" >RIV/00020699:_____/17:N0000046 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The Link Between Snow Cover Characteristics and Drought Propagation Processes

Popis výsledku v původním jazyce

The ecological and hydrological impacts of snow cover are important for water-resource issues. This study presents the linkage between snow cover characteristics and standardized precipitation evapotranspiration index (SPEI). To quantify the change in current snow phenology, we identified the onset and termination dates of snow cover from 1961 to 2017 using 184 stations in the Czech Republic. The basic snow cover characteristics used in this study consist of the first day and the last day of snow cover, the number of days with snow cover (DSC) with ≥1cm, ≥10cm and ≥20cm, and snow water equivalent (SWE). Changes in the snow cover characteristics, the number of frost days and days with Tmin>0°C were anylised during the cold season (October-March) and winter season (December-February) over the periods 1961-2016, 1961-1990 and 2001-2016. Additionaly, the SWE and precipitation (P) ratio was calculated to examine potential changes in the balance between snow and rain over the cold season. Results show a decline in the volume of snow melt water, and liquid precipitation is more than solid precipitation during the cold season. Decreasing trends in SWE/P ratio are most pronounced at lower elevations, and are associated with trends toward fewer snowfall days and the shortening of time that snow is on the ground. Decreases in the occurrences of frost days appear to be contributing to decreases in DSC ≥1cm, ≥10cm and ≥20cm. The period 2001-2016 shows substantially decreasing of DSC ≥10 cm and 20cm at higher elevations, its trend varies between 16.5 and 26.3 days decade-1 during the cold season. The end date of snow cover over the last 16 years shows a rapid advance mostly in the western hilly areas.

Název v anglickém jazyce

The Link Between Snow Cover Characteristics and Drought Propagation Processes

Popis výsledku anglicky

The ecological and hydrological impacts of snow cover are important for water-resource issues. This study presents the linkage between snow cover characteristics and standardized precipitation evapotranspiration index (SPEI). To quantify the change in current snow phenology, we identified the onset and termination dates of snow cover from 1961 to 2017 using 184 stations in the Czech Republic. The basic snow cover characteristics used in this study consist of the first day and the last day of snow cover, the number of days with snow cover (DSC) with ≥1cm, ≥10cm and ≥20cm, and snow water equivalent (SWE). Changes in the snow cover characteristics, the number of frost days and days with Tmin>0°C were anylised during the cold season (October-March) and winter season (December-February) over the periods 1961-2016, 1961-1990 and 2001-2016. Additionaly, the SWE and precipitation (P) ratio was calculated to examine potential changes in the balance between snow and rain over the cold season. Results show a decline in the volume of snow melt water, and liquid precipitation is more than solid precipitation during the cold season. Decreasing trends in SWE/P ratio are most pronounced at lower elevations, and are associated with trends toward fewer snowfall days and the shortening of time that snow is on the ground. Decreases in the occurrences of frost days appear to be contributing to decreases in DSC ≥1cm, ≥10cm and ≥20cm. The period 2001-2016 shows substantially decreasing of DSC ≥10 cm and 20cm at higher elevations, its trend varies between 16.5 and 26.3 days decade-1 during the cold season. The end date of snow cover over the last 16 years shows a rapid advance mostly in the western hilly areas.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

<a href="/cs/project/QJ1610072" target="_blank" >QJ1610072: Systém pro monitoring a předpověď dopadů zemědělského sucha</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů