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Screening variability and change of soil moisture under wide-ranging climate conditions: Snow dynamics effects.

Verrot L, Destouni G - Ambio (2015)

Bottom Line: Soil moisture influences and is influenced by water, climate, and ecosystem conditions, affecting associated ecosystem services in the landscape.Spatially, average intra-annual variability of soil moisture differs considerably between the basins due to their temperature-related differences in snow dynamics.With regard to temporal change, the long-term average state and intra-annual variability of soil moisture have not changed much, while inter-annual variability has changed considerably in response to hydro-climatic changes experienced so far in each basin.

View Article: PubMed Central - PubMed

Affiliation: Department of Physical Geography and Quaternary Geology, Stockholm University, 106 91, Stockholm, Sweden, lucile.verrot@natgeo.su.se.

ABSTRACT
Soil moisture influences and is influenced by water, climate, and ecosystem conditions, affecting associated ecosystem services in the landscape. This paper couples snow storage-melting dynamics with an analytical modeling approach to screening basin-scale, long-term soil moisture variability and change in a changing climate. This coupling enables assessment of both spatial differences and temporal changes across a wide range of hydro-climatic conditions. Model application is exemplified for two major Swedish hydrological basins, Norrström and Piteälven. These are located along a steep temperature gradient and have experienced different hydro-climatic changes over the time period of study, 1950-2009. Spatially, average intra-annual variability of soil moisture differs considerably between the basins due to their temperature-related differences in snow dynamics. With regard to temporal change, the long-term average state and intra-annual variability of soil moisture have not changed much, while inter-annual variability has changed considerably in response to hydro-climatic changes experienced so far in each basin.

No MeSH data available.


Average intra-annual distribution of monthly mean measured precipitation P (yellow lines) and mean effective precipitation Peff (red lines) for the time period 1950–2009, in Norrström (a) and Piteälven (b). Dashed lines show one standard deviation from average values
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Fig2: Average intra-annual distribution of monthly mean measured precipitation P (yellow lines) and mean effective precipitation Peff (red lines) for the time period 1950–2009, in Norrström (a) and Piteälven (b). Dashed lines show one standard deviation from average values

Mentions: The characteristics of Peff and P, in terms of average intra-annual distribution over the whole study period (Fig. 2), show the effect of snow storage and melting in both study basins. The effect of snow storage is evident in smaller monthly Peff than P values in winter, and the effect of snow melting is evident in greater monthly Peff than P values in spring. As expected, the volume of water stored as snow in winter, and then released as liquid water in spring, is much greater in the cold Piteälven basin than in the warmer Norrström basin. Furthermore, the snow melting in Norrström is evenly spread over March–April, whereas in Piteälven, it is primarily spread over April–May with a pronounced melting peak in May. The snow storage season in winter is also longer in Piteälven (from October until March) than in Norrström (November until February).Fig. 2


Screening variability and change of soil moisture under wide-ranging climate conditions: Snow dynamics effects.

Verrot L, Destouni G - Ambio (2015)

Average intra-annual distribution of monthly mean measured precipitation P (yellow lines) and mean effective precipitation Peff (red lines) for the time period 1950–2009, in Norrström (a) and Piteälven (b). Dashed lines show one standard deviation from average values
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4289003&req=5

Fig2: Average intra-annual distribution of monthly mean measured precipitation P (yellow lines) and mean effective precipitation Peff (red lines) for the time period 1950–2009, in Norrström (a) and Piteälven (b). Dashed lines show one standard deviation from average values
Mentions: The characteristics of Peff and P, in terms of average intra-annual distribution over the whole study period (Fig. 2), show the effect of snow storage and melting in both study basins. The effect of snow storage is evident in smaller monthly Peff than P values in winter, and the effect of snow melting is evident in greater monthly Peff than P values in spring. As expected, the volume of water stored as snow in winter, and then released as liquid water in spring, is much greater in the cold Piteälven basin than in the warmer Norrström basin. Furthermore, the snow melting in Norrström is evenly spread over March–April, whereas in Piteälven, it is primarily spread over April–May with a pronounced melting peak in May. The snow storage season in winter is also longer in Piteälven (from October until March) than in Norrström (November until February).Fig. 2

Bottom Line: Soil moisture influences and is influenced by water, climate, and ecosystem conditions, affecting associated ecosystem services in the landscape.Spatially, average intra-annual variability of soil moisture differs considerably between the basins due to their temperature-related differences in snow dynamics.With regard to temporal change, the long-term average state and intra-annual variability of soil moisture have not changed much, while inter-annual variability has changed considerably in response to hydro-climatic changes experienced so far in each basin.

View Article: PubMed Central - PubMed

Affiliation: Department of Physical Geography and Quaternary Geology, Stockholm University, 106 91, Stockholm, Sweden, lucile.verrot@natgeo.su.se.

ABSTRACT
Soil moisture influences and is influenced by water, climate, and ecosystem conditions, affecting associated ecosystem services in the landscape. This paper couples snow storage-melting dynamics with an analytical modeling approach to screening basin-scale, long-term soil moisture variability and change in a changing climate. This coupling enables assessment of both spatial differences and temporal changes across a wide range of hydro-climatic conditions. Model application is exemplified for two major Swedish hydrological basins, Norrström and Piteälven. These are located along a steep temperature gradient and have experienced different hydro-climatic changes over the time period of study, 1950-2009. Spatially, average intra-annual variability of soil moisture differs considerably between the basins due to their temperature-related differences in snow dynamics. With regard to temporal change, the long-term average state and intra-annual variability of soil moisture have not changed much, while inter-annual variability has changed considerably in response to hydro-climatic changes experienced so far in each basin.

No MeSH data available.