Climate and Catastrophe Risk Assessment - Asia
Difference (m/s)
Difference (hPa)
Met Office
cass
Data Resolution 2
1.0
0.5.
0.0-
(a) Gust Speed (1hr max)
-0.5
-1.0
1001
75
50
45
25
0
(b) MSLP (1hr min)
15 10 20
30 40 50 60 70
80
90 95 99
1.5km percentiles
www.metoffice.gov.uk
Federal Ministry
for the Environment, Nature Conservation
and Nuclear Safety
part of the Oasis Platform for Climate and Catastrophe Risk Assessment -
Asia, a project funded by the International Climate Initiative (IKI)
1.5km
faster
1.5km
slower
All subsequent analysis presented here focuses on 4.4km data - mainly for
computational reasons (further discussion of this later). But we also
examine the difference between the two resolutions for two key variables:
maximum gust speed and minimum mean sea-level pressure.
Differences in maximum gust speed footprints, for the 1st to 80th
Key Point (c) ► percentiles, of the 1.5km data are roughly O(0.5 m/s) faster than the 4.4km
data. For the very highest gust speeds (90th, 95th and 99th percentiles of
the 1.5km data) the differences with the 4.4km data shows much greater
variability. We suspect that the minimal difference seen in the upper
extreme percentiles results from under sampling rather than a systematic
difference.
1.5km
shallower
1.5km
deeper
Key Point (d) ▼
For minimum MSLP footprints, extreme lows of the 1.5km data are [50, 87]
hPa and [10, 37] hPa shallower for the 1st and 5th percentiles respectively
(90% HDI). Given the relationship between central pressure deficit (i.e. the
difference between the tropical cyclone central pressure and the
environmental pressure outside the tropical cyclone), peak wind speed and
tropical cyclone size, this comparisons suggests that 1.5km storms must
also be smaller in size than the 4.4km storms.
Key Point (e) ▲
7
B
CC
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