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Enhanced capability to monitor drought using citizen weather stations

Irene
May 05, 2021

Enhanced capability to monitor drought using citizen weather stations

Slides used during our presentation at the EGU 2021 conference, in the session "HS4.2 - Drought and water scarcity: monitoring, modelling and forecasting to improve hydro-meteorological risk management ". You can check the information of the session in this link: https://meetingorganizer.copernicus.org/EGU21/session/39888#

Irene

May 05, 2021
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  1. Enhanced capability to
    monitor drought using
    citizen weather stations
    I. Garcia-Marti, M. de Haij, H. Leijnse,
    JW. Noteboom, A. Overeem, G vd Schrier
    vEGU21, Session HS4.2
    Drought and water scarcity: monitoring, modelling
    and forecasting to improve hydro-meteorological
    risk management
    30th April 2021

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  2. Background
    › Global warming: triggers or expands
    drought conditions at our planet
    › Netherlands: past several years we
    experienced drought conditions not
    measured since 1976.
    › KNMI: developed a cloud-based
    product showing the daily drought
    levels across country (2019):
    – Standard Precipitation Index (SPI)
    (McKee et al., 1993)
    – ~70 years of rainfall (1951-2010)
    › Present: Help decision-makers to
    assess meteorological drought and
    enable preventive measures

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  3. Background
    › Third-party data: weather observations
    measured by citizens! European met offices
    are interested in 3PD observations.
    › Citizen weather stations: citizens monitoring
    weather in private spaces (e.g. home,
    schools) using semi-professional devices
    › KNMI: Partner of WOW initiative (UK) since
    2015, 900+ CWS in the network, 150+ M
    observations (2015 -2020)
    › Present: we studied the quality of
    temperature, wind speed and rainfall
    observations
    WOW-NL
    KNMI

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  4. Research questions
    What if we combine the SPI with WOW observations?
    › What is the added value of 3PD
    observations (e.g. research, operational,
    economic) provide wrt official networks?
    › Assessing the possibility of providing
    higher resolution drought maps including
    WOW-NL data
    › Enable the possibility for underrepresented
    regions to obtain local drought metrics
    WOW-NL
    rainfall
    (2018-2019)
    daily gridded
    precipitation
    (1951-2011)
    SPI
    Calculations
    Calibrated
    model
    5-min
    interval
    aggregation
    Quality
    control
    QC’d WOW-
    NL rainfall
    Radar data at
    5-min interval
    SPI-WOW
    KNMI’s SPI DROUGHT INDEX
    SPI-WOW DROUGHT INDEX

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  5. 5
    After QC, results show moderate positive correlation ☺
    But who are these dry stations?

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  6. 6
    Random distribution suggests “faulty
    stations”… that do pass the QC

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  7. 7
    Overlay official SPI vs WOW SPI Difference between two networks
    Visualizing skill
    (GIF animation, should move ☺)
    (colors should blend) (difference should be grey)

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  8. 8
    Visualizing skill
    ~30km
    Good agreement between
    official and WOW SPI
    Is it a glitch of the WOW network, or
    is it that the official SPI is underestimating
    local drought conditions?

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  9. Recap
    WOW-NL picks drought signal
    Pinpoint local drought conditions
    A thorough comparison is needed
    Value
    3PD might contribute to official products!
    Research: Hi-resolution indicators of drought risk
    Operations: underrepresented areas -> local drought
    Big picture
    Multi-Hazard Early Warning Systems
    Hi-res weather warnings and forecast
    Climate Services
    Wrapping up

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