Climatology of Wet-Bulb Globe Temperature In Australia · 2019-06-20 · Climatology of Wet-Bulb...
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Weather Intelligence, a Katestone company, is a national leader in providing accurate, relevant and meaningful weather intelligence data to solve industry problems. Located in Brisbane, our team of highly skilled scientists, meteorologists and engineers have more than 20 years experience solving climate-related business problems. o The highest daily maximum WBGT occur in the tropical north, especially in coastal areas, whereas the highest values of (dry-bulb) temperature are in central interior and northwestern Australia. o More than half of year, the daily maximum of WBGT > 28˚C across much of the tropics (check “Sports” and “Work” tables to see the consequences) o Weak daily amplitude of WBGT in tropical areas. Esteban Abellán P (07) 3369 3699 weatherintelligence.global [email protected] Climatology of Wet-Bulb Globe Temperature In Australia Key Results When the temperature alone does not explain the whole picture… o WBGT values are often confused with air temperature and misinterpreted by workers, managers, and even some occupational health practitioners. o WBGT is not an index of “perceived temperature.” o Insufficient consideration of physiological parameters (clothing, activity, sweating in humans, etc.). o Large forecast uncertainty of WBGT due to solar radiation (cloud cover) and wind speed. WGBT Limitations Motivation Climatology Dataset: ERA5 Reanalysis Spatial Resolution: 30 km approx. Temporal Resolution: hourly Period Analysed: 2001-2015 o (Dry-Bulb) Air temperature alone is not necessarily the best indicator of environmental conditions conductive to heat stress on human health. o Hot temperatures with high humidity reduce the ability of the human body to dissipate metabolic heat, leading to increased body core temperature. o Wet-Bulb Globe Temperature estimates the effect of temperature, humidity, wind speed and solar radiation on humans. o WBGT is one of the most widely used and validated index for assessing the occupational heat stress. o However, a detailed WBGT climatology in Australia has not been carried out Hourly Climatology Average number of days with several thresholds Air Temperature Comparison Climatology during the Hot Season Wet-Bulb Globe Temperature (WBGT) Temperature Humidity Wet-Bulb Temperature (WBT) Black-Globe Temperature (BGT) Temperature, Solar Radiation Wind Speed WBGT = 0.7 WBT + 0.2 BGT + 0.1 T Application Examples Sports Medicine Australia (SMA) heat policy 2 WBGT Risk of heat illness Recommendations <20˚C Low Heat illness can occur in distance running. 21-25˚C Moderate Increase vigilance and take more breaks. 26-29˚C High Limit intensity and duration. >= 30˚C Extreme Cancellation (allow swimming). WBGT TLVs for Worker Heat Stress Exposure 1 Rest/work ratios Light work Medium work Heavy work Very heavy work Continuous work 31.0 28.0 27.0 25.5 25% rest/hour 31.5 29.0 27.5 26.5 50% rest/hour 32.0 30.5 29.5 28.0 75% rest/hour 32.5 32.0 31.5 31.0 No work at all 39.0 37.0 36 34.0 WBGT dependence Definition WGBT Limitations 1. Threshold Limit Values for chemical substances and physical agents and biological exposure indices, American Conference of Governmental Industrial Hygienists, 2013 2. Hot Weather Guidelines for Sporting clubs and associations and the physically active, Sports Medicine Australia 2007 (web site: https://sma.org.au/ accessed 31 May 2019) 3. Chalmers, S. and O. Jay, 2018: “Australian community sport extreme heat policies: Limitations and opportunities for improvement” J. Science and Medicine in Sport, 21, 544-548 4. Liljegren, J. et al., 2008: “Modeling the WBGT using standard meteorological measurements” J. Occupational and Environmental Hygiene, 5, 645-655 References Esteban Abellán, Christine Killip, Frank Quintarelli
Transcript of Climatology of Wet-Bulb Globe Temperature In Australia · 2019-06-20 · Climatology of Wet-Bulb...
Weather Intelligence, a Katestone company, is a national leader in providing accurate, relevant and meaningful weather intelligence data to solve industry problems. Located in Brisbane, our team of highly skilled scientists, meteorologists and engineers have more than 20 years experience solving climate-related business problems.
o The highest daily maximum WBGT occur in the tropical north, especially in coastal areas, whereas the highest values of (dry-bulb) temperature are in central interior and northwestern Australia.
o More than half of year, the daily maximum of WBGT > 28˚C across much of the tropics (check “Sports” and “Work” tables to see the consequences)
o Weak daily amplitude of WBGT in tropical areas.
Esteban Abellán
P (07) 3369 3699weatherintelligence.global
Climatology of Wet-Bulb Globe Temperature In Australia
Key Results
When the temperature alone does not explain the whole picture…
o WBGT values are often confused with air temperature and misinterpreted by workers, managers, and even some occupational health practitioners.
o WBGT is not an index of “perceived temperature.”o Insufficient consideration of physiological parameters (clothing, activity,
sweating in humans, etc.).o Large forecast uncertainty of WBGT due to solar radiation (cloud cover) and
wind speed.
WGBT Limitations
Motivation
Climatology Dataset: ERA5 ReanalysisSpatial Resolution: 30 km approx.
Temporal Resolution: hourlyPeriod Analysed: 2001-2015
o (Dry-Bulb) Air temperature alone is not necessarily the best indicator of environmental conditions conductive to heat stress on human health.
oHot temperatures with high humidity reduce the ability of the human body to dissipate metabolic heat, leading to increased body core temperature.
oWet-Bulb Globe Temperature estimates the effect of temperature, humidity, wind speed and solar radiation on humans.
oWBGT is one of the most widely used and validated index for assessing the occupational heat stress.
oHowever, a detailed WBGT climatology in Australia has not been carried out
Hourly Climatology
Average number of days with several thresholds
Air Temperature Comparison
Climatology during the Hot Season
Wet-Bulb Globe Temperature (WBGT)
TemperatureHumidity
Wet-Bulb Temperature (WBT) Black-Globe Temperature (BGT)Temperature, Solar Radiation
Wind Speed
WBGT = 0.7 WBT + 0.2 BGT + 0.1 T
Application ExamplesSports Medicine Australia (SMA) heat policy 2
WBGT Risk of heat illness Recommendations
<20˚C Low Heat illness can occur in distance running.
21-25˚C Moderate Increase vigilance and take more breaks.
26-29˚C High Limit intensity and duration.
>= 30˚C Extreme Cancellation (allow swimming).
WBGT TLVs for Worker Heat Stress Exposure 1
Rest/work ratios Light work Medium work Heavy work
Very heavy work
Continuous work 31.0 28.0 27.0 25.5
25% rest/hour 31.5 29.0 27.5 26.5
50% rest/hour 32.0 30.5 29.5 28.0
75% rest/hour 32.5 32.0 31.5 31.0
No work at all 39.0 37.0 36 34.0
WBGT dependence
Definition
WGBT Limitations
1. Threshold Limit Values for chemical substances and physical agents and biological exposure indices, American Conference of Governmental Industrial Hygienists, 2013
2. Hot Weather Guidelines for Sporting clubs and associations and the physically active, Sports Medicine Australia 2007 (web site: https://sma.org.au/ accessed 31 May 2019)
3. Chalmers, S. and O. Jay, 2018: “Australian community sport extreme heat policies: Limitations and opportunities for improvement” J. Science and Medicine in Sport, 21, 544-548
4. Liljegren, J. et al., 2008: “Modeling the WBGT using standard meteorological measurements” J. Occupational and Environmental Hygiene, 5, 645-655
References
Esteban Abellán, Christine Killip, Frank Quintarelli
![EE33-M Humidity and Temperature Transmitter for · Relative humidity RH [%] A Temperature T [°C] B Dew point temperature Td [°C] C Frost point temperature Tf [°C] D Wet bulb temperature](https://static.fdocuments.in/doc/165x107/60043f7a53ede430360b8281/ee33-m-humidity-and-temperature-transmitter-for-relative-humidity-rh-a-temperature.jpg)
