scholarly journals Spatial variation in early‐winter snow cover determines local dynamics in a network of alpine butterfly populations

Ecography ◽  
2020 ◽  
Author(s):  
Jens Roland ◽  
Alessandro Filazzola ◽  
Stephen F. Matter
Keyword(s):  
Spatial Variation ◽  
Snow Cover ◽  
Early Winter ◽  
Local Dynamics ◽  
Winter Snow

Phenology of the mosquito Wyeomyia smithii (Coq.) in Manitoba and Ontario

1986 ◽  
Vol 64 (2) ◽  
pp. 285-290 ◽  
Author(s):  
Martha J. Farkas ◽  
Reinhart A. Brust
Keyword(s):  
Snow Cover ◽  
Leaf Size ◽  
Sarracenia Purpurea ◽  
Adult Size ◽  
Early Winter ◽  
Pitcher Plant ◽  
Wyeomyia Smithii ◽  
Ambient Temperatures ◽  
Summer Generation ◽  
Winter Snow

The phenology of Wyeomyia smithii (Coquillett) within the water-filled leaves of Sarracenia purpurea L. (the purple pitcher plant) was studied during 1983 in bogs near The Pas and Patricia Beach, Manitoba, and Kenora, Ontario. Larvae that overwintered developed into adults by early July, and females laid eggs in newly opened leaves, as well as in the previous year's leaves. The largest portion of the developing larvae (summer generation) entered a third-instar diapause by mid-August and remained in this instar until the following spring. A small percentage of the summer generation at each site continued their development to adults and may have given rise to another generation. The number of larvae per leaf was positively correlated with leaf size. Pupation rates as well as adult size and fecundity did not vary significantly amongst sites. Smaller and less fecund individuals emerged as the season progressed. Over-winter survival of larvae was low at Patricia Beach (9%) but relatively high at The Pas (68%) during the winter of 1983–1984; survival was moderate (32–50%) during 1984–1985 at both locations. Overwintering success is likely enhanced by an early winter snow cover which insulates the larvae from low ambient temperatures from October to December at these sites.

scholarly journals Mapping the Distribution of Buried Glacier Ice – An Example From Lago Delle Locce, Monte Rosa, Italian Alps

1986 ◽  
Vol 8 ◽  
pp. 78-81 ◽  
Author(s):  
W. Haeberli ◽  
F. Epifani
Keyword(s):  
Snow Cover ◽  
Seismic Refraction ◽  
Italian Alps ◽  
Frozen Ground ◽  
Near Surface ◽  
Winter Snow ◽  
Glacier Ice ◽  
Geoelectrical Resistivity ◽  
Monte Rosa

Techniques for mapping the distribution of buried glacier ice are discussed and the results, from a study carried out within the framework of flood protection work in the Italian Alps, are presented. Bottom temperatures of the winter snow cover (BTS) primarily indicate the heat flow conditions in the underlying ground and mainly depend on the presence or absence of an ice layer beneath the surface. Determination of BTS values is therefore an inexpensive method for quickly mapping the near-surface underground ice in areas where there is 1 m or more of winter snow cover. At greater depths, and/or when more detail is required, geoelectrical resistivity soundings and seismic refraction soundings are most commonly used to investigate underground ice. A combination of the two sounding techniques allows the vertical extent and the main characteristics (frozen ground, dead glacier ice) to be determined in at least a semi-quantitative way. Complications mainly arise from irregularity in the horizontal extension of the studied underground ice bodies, and they may have to be overcome by expensive core drillings and borehole measurements. Widespread occurrence of buried glacier ice was observed in morainic deposits, surrounding an ice-dammed lake near Macugnaga, Italy.

scholarly journals Climatic influence on the composition of snow cover at Austre Okstindbreen, Norway, 1989 and 1990

1994 ◽  
Vol 19 ◽  
pp. 1-6 ◽  
Author(s):  
He Yuanqing ◽  
Wilfred H. Theakstone
Keyword(s):  
Snow Cover ◽  
North Atlantic ◽  
Early Summer ◽  
Late Winter ◽  
Crustal Material ◽  
Air Masses ◽  
The North ◽  
Air Temperatures ◽  
Winter Snow ◽  
Marine Source

Winter snow cover at Austre Okstindbreen is influenced strongly by patterns of atmospheric circulation, and by air temperatures during precipitation. Differences of circulation over the North Atlantic and Scandinavia during the winters of 1988–89 and 1989–90 were reflected in the ionic and isotopic composition of snow that accumulated at the glacier. Early summer ablation did not remove, or smooth out, all the initial stratigraphic differences. In the first half of the 1988–89 winter, most air masses took a relatively short route between a marine source and Okstindan; late winter snowfalls were from air masses which had taken a longer continental route. The snow that accumulated in the first half of the 1989–90 winter was associated with air masses which had followed longer continental routes, and so brought higher concentrations of impurities from forests, lakes and crustal material. The ablation season began earlier in 1990 than in 1989, and summer winds and rain supplied more impurities to the snowpack surface.

IOD influence on the early winter tibetan plateau snow cover: diagnostic analyses and an AGCM simulation

2011 ◽  
Vol 39 (7-8) ◽  
pp. 1643-1660 ◽  
Author(s):  
Chaoxia Yuan ◽  
Tomoki Tozuka ◽  
Toshio Yamagata
Keyword(s):  
Tibetan Plateau ◽  
Snow Cover ◽  
Early Winter ◽  
Tibetan Plateau Snow Cover

scholarly journals Effects of Winter Snow Cover on Spring Soil Moisture Based on Remote Sensing Data Product over Farmland in Northeast China

2020 ◽  
Vol 12 (17) ◽  
pp. 2716
Author(s):  
Shuang Liang ◽  
Xiaofeng Li ◽  
Xingming Zheng ◽  
Tao Jiang ◽  
Xiaojie Li ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Soil Moisture ◽  
Linear Regression ◽  
Snow Cover ◽  
Snow Depth ◽  
Northeast China ◽  
Regression Models ◽  
Linear Regression Models ◽  
Winter Snow ◽  
The Relationship

Spring soil moisture (SM) is of great importance for monitoring agricultural drought and waterlogging in farmland areas. While winter snow cover has an important impact on spring SM, relatively little research has examined the correlation between winter snow cover and spring SM in great detail. To understand the effects of snow cover on SM over farmland, the relationship between winter snow cover parameters (maximum snow depth (MSD) and average snow depth (ASD)) and spring SM in Northeast China was examined based on 30 year passive microwave snow depth (SD) and SM remote-sensing products. Linear regression models based on winter snow cover were established to predict spring SM. Moreover, 4 year SD and SM data were applied to validate the performance of the linear regression models. Additionally, the effects of meteorological factors on spring SM also were analyzed using multiparameter linear regression models. Finally, as a specific application, the best-performing model was used to predict the probability of spring drought and waterlogging in farmland in Northeast China. Our results illustrated the positive effects of winter snow cover on spring SM. The average correlation coefficient (R) of winter snow cover and spring SM was above 0.5 (significant at a 95% confidence level) over farmland. The performance of the relationship between snow cover and SM in April was better than that in May. Compared to the multiparameter linear regression models in terms of fitting coefficient, MSD can be used as an important snow parameter to predict spring drought and waterlogging probability in April. Specifically, if the relative SM threshold is 50% when spring drought occurs in April, the prediction probability of the linear regression model concerning snow cover and spring SM can reach 74%. This study improved our understanding of the effects of winter snow cover on spring SM and will be beneficial for further studies on the prediction of spring drought.

scholarly journals Winter snow cover variability on East Antarctic sea ice

1998 ◽  
Vol 103 (C11) ◽  
pp. 24837-24855 ◽  
Author(s):  
R. A. Massom ◽  
V. I. Lytle ◽  
A. P. Worby ◽  
I. Allison
Keyword(s):  
Sea Ice ◽  
Snow Cover ◽  
Antarctic Sea Ice ◽  
Winter Snow

Winter snow cover increases swamp rabbit (Sylvilagus aquaticus) mortality at the northern extent of their range

2018 ◽  
Vol 93 ◽  
pp. 93-96 ◽  
Author(s):  
Elizabeth M. Hillard ◽  
Alison C. Edmund ◽  
Joanne C. Crawford ◽  
Clayton K. Nielsen ◽  
Eric M. Schauber ◽  
...  
Keyword(s):  
Snow Cover ◽  
Winter Snow ◽  
Swamp Rabbit

scholarly journals Adaptations of large marsupials to survival in winter snow cover: locomotion and foraging

2016 ◽  
Vol 94 (11) ◽  
pp. 753-759
Author(s):  
K. Green
Keyword(s):  
Snow Cover ◽  
Dietary Habit ◽  
Mammalian Fauna ◽  
Morphological Aspects ◽  
Plant Groups ◽  
Winter Snow ◽  
Lower Elevation ◽  
Common Wombat ◽  
Seasonal Snow Cover ◽  
Swamp Wallaby

The small extent of seasonally snow-covered Australian mountains means that there has not been a great selective pressure on the mammalian fauna for adaptations to this environment. Only one large marsupial, the common wombat (Vombatus ursinus (Shaw, 1800)), is widespread above the winter snowline. In the past 20 years, with snow depth and duration declining, the swamp wallaby (Wallabia bicolor (Desmarest, 1804)) has become more common above the winter snowline. The red-necked wallaby (Macropus rufogriseus (Desmarest, 1817)) is common in alpine Tasmania where seasonal snow cover is neither as deep nor as long-lasting as on the mainland, but has only been recorded regularly above the winter snowline in the mainland Snowy Mountains since 2011. This study examines morphological aspects of locomotion of these three herbivorous marsupials in snow. The wombat is the best adapted to snow, with quadrupedal gait and an expanded home range allowing it to locate and feed on the same plant groups as it does at lower elevation. Wallabies are poorly adapted to locomotion in snow, but the browsing swamp wallaby is able to maintain its dietary habit by feeding on exposed shrubs in deep snow, whereas the red-necked wallaby, which depends more on grazing, appears constrained to areas where snow is shallow.

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