Present-Day Climate at Zackenberg

Hansen, Birger Ulf; Sigsgaard, Charlotte; Rasmussen, Leif; Cappelen, John; Hinkler, Jørgen; Mernild, Sebastian H.; Petersen, Dorthe; Tamstorf, Mikkel P.; Rasch, Morten; Hasholt, Bent

doi:10.1016/s0065-2504(07)00006-2

Cited by 115 publications

(118 citation statements)

References 29 publications

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“…(or ∼85%), largely due to changes in precipitation. Since storm tracks determine the distribution of precipitation across Greenland (e.g., Hansen et al, 2008), the average increase in precipitation in the Kangerlussuaq area was most likely due to changes of the passage of low pressure systems around Greenland. , subdivided between runoff originating from the GrIS (based on snow and ice melt, and liquid precipitation) and from the proglacial area outside the GrIS (based on snowmelt and liquid precipitation): to get the runoff contribution from the proglacier landscape, the GrIS runoff was subtracted from the overall catchment runoff.…”

Section: Resultsmentioning

confidence: 99%

Runoff and mass-balance simulations from the Greenland Ice Sheet at Kangerlussuaq (Søndre Strømfjord) in a 30-year perspective, 1979–2008

et al. 2010

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Abstract. This study provides insights into surface massbalance (SMB) and runoff exiting the Watson River drainage basin, Kangerlussuaq, West Greenland during a 30 year period (1978/1979-2007/2008) when the climate experienced increasing temperatures and precipitation. The 30-year simulations quantify the terrestrial freshwater output from part of the Greenland Ice Sheet (GrIS) and the land between the GrIS and the ocean, in the context of global warming and increasing GrIS surface melt. We used a snow-evolution modeling system (SnowModel) to simulate the winter accumulation and summer ablation processes, including runoff and SMB, of the ice sheet: indicating that the simulated equilibrium line altitude (ELA) was in accordance with independent observations. To a large extent, the SMB fluctuations could be explained by changes in net precipitation (precipitation minus evaporation and sublimation), with 8 out of 30 years having negative SMB, mainly because of relatively low annual net precipitation. The overall trend in net precipitation and runoff increased significantly, while SMB increased insignificantly throughout the simulation period, leading to enhanced precipitation of 0.59 km 3 w.eq. (or ∼60%), runoff of 0.43 km 3 w.eq. (or ∼55%), and SMB of 0.16 km 3 w.eq.

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Section: Resultsmentioning

confidence: 99%

Runoff and mass-balance simulations from the Greenland Ice Sheet at Kangerlussuaq (Søndre Strømfjord) in a 30-year perspective, 1979–2008

et al. 2010

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“…Zackenberg research station hosts one of the most comprehensive ecosystem-based monitoring programs in the Arctic and numerous background data are therefore available from this otherwise remote locality (Forchhammer et al 2008). The climate at Zackenberg is high-arctic with a mean annual temperature of -9°C (Hansen et al 2008), and both light regimes, temperature and snow conditions change markedly during the year (Fig. 1).…”

Section: Study Sitementioning

confidence: 99%

“…As ambient temperature, we used records of local temperature (°C) obtained from an automatic climate tower located at Zackenberg, in the centre of the Wollaston Forland region (Hansen et al 2008). Temperature was recorded hourly 2 m above terrain during the study period (Table 2).…”

Section: Environmental Predictor Variables and Habitat Usementioning

confidence: 99%

Identifying Movement States From Location Data Using Cluster Analysis

Moorter¹,

Visscher

Jerde

et al. 2010

J Wildl Manag

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Animal movement studies regularly use movement states (e.g., slow and fast) derived from remotely sensed locations to make inferences about strategies of resource use. However, the number of movement state categories used is often arbitrary and rarely inferred from the data. Identifying groups with similar movement characteristics is a statistical problem. We present a framework based on k‐means clustering and gap statistic for evaluating the number of movement states without making a priori assumptions about the number of clusters. This allowed us to distinguish 4 movement states using turning angle and step length derived from Global Positioning System locations and head movements derived from tip switches in a neck collar of free‐ranging elk (Cervus elaphus) in west central Alberta, Canada. Based on movement characteristics and on the linkage between each state and landscape features, we were able to identify inter‐patch movements, intra‐patch foraging, rest, and inter‐patch foraging movements. Linking behavior to environment (e.g., state‐dependent habitat use) can inform decisions on landscape management for wildlife.

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“…Mean monthly wind speeds are highest in the winter (5-6 m s À1 from December to March) and generally from a northerly direction, and lowest during summer (about 3 m s À1 in July to August), mostly from a southerly direction. Strong foehn and katabatic winds occur during winter, where maximum wind speeds may exceed 30 m s À1 (Hansen et al, 2008).…”

Section: Regional Settingmentioning

confidence: 99%

Holocene sea‐level reconstruction in the Young Sound region, Northeast Greenland

Pedersen

Kroon

Jakobsen

2011

J Quaternary Science

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A relative sea-level curve over the Holocene is constructed for the Young Sound region in northeastern Greenland. The reconstruction is derived by dating the heights of raised beach ridges in coastal plains using optically stimulated luminiscence (OSL), and by dating palaeoterrestrial surface levels now buried beneath the intertidal frame using the 14 C technique. The relative sea-level curve reveals a rapid fall of at least 10 mm a À1 from ca. 9500 to 7500 a ago, which slowed to 2 mm a À1 until it reached the present sea level ca. 3000 a ago. This part of the curve is based on the raised beach ridge data. Thereafter, relative sea level continued to fall, to reach a minimum level at about 0.5 m below the present sea level ca. 2300 a ago. Since then, relative sea level has experienced a slow rise of about 0.2 mm a À1 . This part of the curve uses the data from the palaeoterrestrial surfaces. The study supplements other estimates of Holocene relative sea-level changes and supports the observations of a decreasing trend in the timing of the cross point and in minimum relative sea level from South to North Greenland.

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Present-Day Climate at Zackenberg

Cited by 115 publications

References 29 publications

Runoff and mass-balance simulations from the Greenland Ice Sheet at Kangerlussuaq (Søndre Strømfjord) in a 30-year perspective, 1979–2008

Runoff and mass-balance simulations from the Greenland Ice Sheet at Kangerlussuaq (Søndre Strømfjord) in a 30-year perspective, 1979–2008

Identifying Movement States From Location Data Using Cluster Analysis

Holocene sea‐level reconstruction in the Young Sound region, Northeast Greenland

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