Heatwaves

Testbed course 16.2.2007

Niina Niinimäki Reija Ruuhela

28.4.2020

• •

Temperature distribution during heat waves

Motivation:

• Need to determine criteria for heat wave warnings • How well HKI-Kaisaniemi and HKI-Vantaa FMI stations represent capital area on hot days?

• Pilot for more detailed study

Case studies of 2 to 5 hot days

• 1 to 3 measurement days of Lämsä-project (in June) • 1 to 2 hot days in July, temp > 30 o C in HKI-Vantaa 28.4.2020

2

Daily max and min temperature in Kaisaniemi 15.06-15.07.2006

28.4.2020

3

19.06.2006 klo 12 utc 28.4.2020

4

20.06.2006 12 utc 28.4.2020

5

21.06.2006 12 utc 28.4.2020

6

07.07.2006 12 utc 28.4.2020

7

08.07.2006 12 utc 28.4.2020

8

• • •

Digging data

FMI stations HKI-Kaisaniemi, HKI-Vantaa Testbed-stations covering Helsinki and partly Espoo and Vantaa Helsinki Metropolitan network

• •

Parameters: Daily Tmax, Tmin Selected stations: temperature time series

•

Heat stress of roof workers

28.4.2020

9

July 2006 temperatures in Helsinki

Asema

Harmaja Kaivopuisto ¹ Bulevardi Mannerheimintie 7

Kaisaniemi

Hietaniemi Sörnäinen Roihupelto

T

17,0 18,7 19,3 19,9 18,9 18,7 19,9 -

T-min T-max *T-min* *T-max* Hellevrk

12,2 12,0 12,5 24,5 26,8 29,5 14,6 14,8 16,0 20,2 22,0 22,9 0 4 7 12,3 9,6 10,1 12,3 - 30,6 29,2 29,4 29,4 - 16,0 14,0 14,0 15,7 - 24,5 23,3 23,5 24,0 - 10 7 7 10 - Juho-Pekka Kaukoranta, 2006 28.4.2020

10

Expected findings

• •

Kaisaniemi is relatively cool station in Helsinki urban area HKI-Vantaa: airport, 30 km from the centre, not representative for urban area

• •

-> Testbed data very useful Spatial temperature distribution and Heat stress experienced by risks groups (e.g. outdoor workers) should be considered while determining the heat warning threshold values

•

Experience of using Testbed-data

• Data digging very hard • Need for some new tools for the interface 28.4.2020

11