eruption at or near Grímsvötn, was about to
begin, or was already in progress. Immediately,
NCPA upgraded to alert phase and OACC di-
verted all air traffi c to >60 nautical miles (>111
km) distance from Grímsvötn. A volcano-SIG-
MET warning of a signifi cant meteorological
hazard to aviation was broadcast at 2026 UTC,
specifying the likely location and probable
height of the tephra plume
/media/jar/myndsafn/2005EO260001.pdf
) and Jónsdóttir (2008).
Therefore, comparison of measured and simulated water balance cannot be di-
rectly used for validation of the model-generated precipitation. According to the
non-scaled MM5 output for the period 1961–1990, mean precipitation for the
whole of Iceland was 1790 mm y−1. After scaling the precipitation, this value
was reduced to 1750mm y−1, i.e. by approximately 2%. This difference
/media/ces/Paper-Olafur-Rognvaldsson_92.pdf
as a method to calculate glacier and ice
sheet velocity. The two most common techniques revolve around radar interferometry, and
feature tracking using radar or visible imagery. Velocity calculations from spaceborne plat-
forms, particularly for slower and/or smaller ice masses, are limited by the spatial resolution
and repeat interval of such imagery, however. In this paper, we evaluate the potential
/media/vatnafar/joklar/Reykholt-abstracts.pdf
m
J
M5 [C°] -3
obs. [C°] -4
nce 1
re 5. Comp
26); an int
temperatu
this system
y gridded v
picion abo
-Jökulsá w
similar dif
han observ
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ces the effe
months No
ly only on
high the tem
n band wi
refore be s
onthly tem
an Feb Ma
.2 -3.1 -3.
.3 -4.1 -3.
.1 1.0 0.6
arison of m
erpolation
re is shown
atic differe
alues, see T
ut the qual
atershed; b
ference wa
ations for t
gradient fo
/media/ces/2010_017.pdf
at each site i with the same method used to estimate qR(D;T ), but instead of pooling
AMF series for a given duration D from different sites, the estimation is made individually for
each site i by pooling AMF series for different durations D (see Crochet, 2012c). The index
flood µi(D), is modeled at each site i as a continuous function of D, as follows:
µi(D) =
µi
1+(D=Di)li
; (5)
where µi, Di/media/vedurstofan/utgafa/skyrslur/2014/VI_2014_001.pdf
Veðurstofa Íslands
2 Almannavarnadeild Ríkislögreglustjóra
3 Jarðvísindastofnun Háskólans
4 Istituto Nazionale di Geofisica e Vulcanologia (INGV), Bologna
5 Istituto Nazionale di Geofisica e Vulcanologia (INGV), Pisa
6 Jarðvísindadeild Háskóla Íslands
7 Agricultural University of Iceland
8 Consultant
Skýrsla nr. Dags. ISSN Opin Lokuð
VÍ 2020-011 Desember 2020 1670-8261 Skilmálar:
Heiti skýrslu
/media/vedurstofan-utgafa-2020/VI_2020_011_en.pdf
The hydrological simulations were performed with the Wa-
tershed Simulation and Forecasting System (WSFS) developed
and operated in the Finnish Environment Institute (Vehviläinen
et al., 2005). The WSFS is used in Finland for operational hydrolog-
ical forecasting and flood warnings (www.environment.fi/water-
forecast/), regulation planning and research purposes
(Vehviläinen and Huttunen, 1997
/media/ces/Journal_of_Hydrology_Veijalainen_etal.pdf
by the
inhabitants on a daily basis for driving between towns and villages
for work, school, hobbies or di?erent services. Public avalanche
bulletins are also published for selected areas, aimed towards the
increasing number of backcountry travellers in Iceland during
winter time. The number of human-triggered avalanches recorded
by the Meteorological O>ce has increased substantially over
/media/vedurstofan/utgafa/arsskyrslur/VI_Arsskyrsla_2018_vef.pdf