Phosphate Uptake in Arctic Plants in Relation to Phosphate Supply: The Role of Spatial and Temporal Variability

Oikos ◽  
1994 ◽  
Vol 70 (3) ◽  
pp. 443 ◽  
Author(s):  
Knut Kielland ◽  
F. Stuart Chapin
Keyword(s):  
Temporal Variability ◽  
Phosphate Uptake ◽  
Spatial And Temporal Variability ◽  
Arctic Plants ◽  
Phosphate Supply

The role of storm movement in controlling flash flood response: an analysis of the 28 September 2012 extreme event in Murcia, southeastern Spain

2021 ◽  
Author(s):  
A. Amengual ◽  
M. Borga ◽  
G. Ravazzani ◽  
S. Crema
Keyword(s):  
Temporal Variability ◽  
Flash Flood ◽  
Spatial And Temporal Variability ◽  
Hydrological Response ◽  
Catchment Scale ◽  
Flash Flooding ◽  
Southeastern Spain ◽  
Flood Response

AbstractFlash flooding is strongly modulated by the spatial and temporal variability in heavy precipitation. Storm motion prompts a continuous change of rainfall space-time variability that interacts with the drainage river system, thus influencing the flood response. The impact of storm motion on hydrological response is assessed for the 28 September 2012 flash flood over the semi-arid and medium-sized Guadalentín catchment in Murcia, southeastern Spain. The influence of storm kinematics on flood response is examined through the concept of ‘catchment-scale storm velocity’. This variable quantifies the interaction between the storm system motion and the river drainage network, assessing its influence on the hydrograph peak. By comparing two hydrological simulations forced by rainfall scenarios of distinct spatial and temporal variability, the role of storm system movement on the flood response is effectively isolated. This case study is the first to: (i) show through the catchment-scale storm velocity how storm motion may strongly affect flood peak and timing; and (ii) assess the influence of storm kinematics on hydrological response at different basin scales. In the end, this extreme flash flooding provides a valuable case study of how the interaction between storm motion and drainage properties modulate hydrological response.

scholarly journals Ice front change of marine-terminating outlet glaciers in northwest and southeast Greenland during the 21st century

2018 ◽  
Vol 64 (246) ◽  
pp. 523-535 ◽  
Author(s):  
CHARLIE BUNCE ◽  
J. RACHEL CARR ◽  
PETER W. NIENOW ◽  
NEIL ROSS ◽  
REBECCA KILLICK
Keyword(s):  
Temporal Variability ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Spatial And Temporal Variability ◽  
Spatial And Temporal Patterns ◽  
Negative Mass ◽  
Position Change ◽  
Specific Factors ◽  
Enhanced Surface

ABSTRACTThe increasingly negative mass balance of the Greenland ice sheet (GrIS) over the last ~25 years has been associated with enhanced surface melt and increased ice loss from marine-terminating outlet glaciers. Accelerated retreat during 2000–2010 was concentrated in the southeast and northwest sectors of the ice sheet; however, there was considerable spatial and temporal variability in the timing and magnitude of retreat both within and between these regions. This behaviour has yet to be quantified and compared for all glaciers in both regions. Furthermore, it is unclear whether retreat has continued after 2010 in the northwest, and whether the documented slowdown in the southeast post-2005 has been sustained. Here, we compare spatial and temporal patterns of frontal change in the northwest and southeast GrIS, for the period 2000–2015. Our results show near-ubiquitous retreat of outlet glaciers across both regions for the study period; however, the timing and magnitude of inter-annual frontal position change is largely asynchronous. We also find that since 2010, there is continued terminus retreat in the northwest, which contrasts with considerable inter-annual variability in the southeast. Analysis of the role of glacier-specific factors demonstrates that fjord and bed geometry are important controls on the timing and magnitude of glacier retreat.

Spatial and temporal variability, triggers and drivers of seismically detected rockfalls in the Reintal catchment, German Alps 

2021 ◽  
Author(s):  
Anne Schöpa ◽  
Jens Turowski ◽  
Niels Hovius
Keyword(s):  
Temporal Variability ◽  
Human Life ◽  
Weather Data ◽  
Spatial And Temporal Variability ◽  
Resolution Time ◽  
Mountainous Regions ◽  
Direct Observations ◽  
Lag Times ◽  
Process Domains

<p>Rockfalls are a substantial geohazard to human life and infrastructure in mountainous regions but we still lack detailed understanding of when and where rockfalls occur, and which environmental conditions lead to rockfall over diurnal, seasonal and annual timescales. This is due to the fact that direct observations in alpine landscapes are difficult to make and long, high-resolution time series of measurements are rare. Using seismic techniques, we can collect near-complete catalogues of geomorphic events and record their distributions in time and space. This allows studying the interaction of process domains, the role of various rockfall triggers, and lead and lag times with unprecedented detail.</p><p>We use the unique six-year long seismic dataset of the Reintal rockfall observatory in the German Alps to detect, classify and locate rockfalls in the Reintal catchment. This rockfall catalogue enables us to analyse the spatial and temporal variability of rockfalls spanning several orders of magnitude in size. We test the hypothesis that variations of rockfall in the Reintal catchment are dominated by seasonal patterns. In combination with weather data, we examine boundary conditions, drivers and triggers of rockfalls in this alpine catchment.</p>

Response of Corn Grain Yield to Spatial and Temporal Variability in Emergence

Crop Science ◽  
2004 ◽  
Vol 44 (3) ◽  
pp. 847 ◽  
Author(s):  
Weidong Liu ◽  
Matthijs Tollenaar ◽  
Greg Stewart ◽  
William Deen
Keyword(s):  
Grain Yield ◽  
Temporal Variability ◽  
Spatial And Temporal Variability ◽  
Corn Grain ◽  
Corn Grain Yield
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