🗊Презентация Lake ice climatology

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Lake ice climatology, слайд №1Lake ice climatology, слайд №2Lake ice climatology, слайд №3Lake ice climatology, слайд №4Lake ice climatology, слайд №5Lake ice climatology, слайд №6Lake ice climatology, слайд №7Lake ice climatology, слайд №8Lake ice climatology, слайд №9Lake ice climatology, слайд №10Lake ice climatology, слайд №11Lake ice climatology, слайд №12Lake ice climatology, слайд №13Lake ice climatology, слайд №14Lake ice climatology, слайд №15Lake ice climatology, слайд №16Lake ice climatology, слайд №17Lake ice climatology, слайд №18Lake ice climatology, слайд №19Lake ice climatology, слайд №20Lake ice climatology, слайд №21Lake ice climatology, слайд №22
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Слайды и текст этой презентации

Слайд 1


Lake ice climatology, слайд №1
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Lake ice season
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Lake ice season

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Warming climate  ? Will the lake freeze in future ? How much are freezing date and break-up date affected ? How much is ice thickness affected ? And ice quality? Ice cover stability ? Ice coverage ?
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Warming climate  ? Will the lake freeze in future ? How much are freezing date and break-up date affected ? How much is ice thickness affected ? And ice quality? Ice cover stability ? Ice coverage ?

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Ice phenology Freezing date Strongly connected to air temperature (long-wave radiation, turbulent fluxes) Connection depends on lake depth Freezing after 0oC downcrossing Air temperature falling rate major factor
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Ice phenology Freezing date Strongly connected to air temperature (long-wave radiation, turbulent fluxes) Connection depends on lake depth Freezing after 0oC downcrossing Air temperature falling rate major factor

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Freezing and breakup
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Freezing and breakup

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Lake ice time series Ice phenology freezing date breakup date How to define? Ice cover properties Ice thickness – max annual value Ice concentration (large lakes)
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Lake ice time series Ice phenology freezing date breakup date How to define? Ice cover properties Ice thickness – max annual value Ice concentration (large lakes)

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Lake Kallavesi, Finland 1830 – 2014
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Lake Kallavesi, Finland 1830 – 2014

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Lake ice climatology, слайд №8
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Lake ice climatology, слайд №9
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Lake ice climatology, слайд №10
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Lake ice climatology, слайд №11
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1st order: climate change impact Freezing date ~ 5 day/°C Ice thickness 5–10 cm/°C Breakup date ~ n days after zero upcrossing of heating
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1st order: climate change impact Freezing date ~ 5 day/°C Ice thickness 5–10 cm/°C Breakup date ~ n days after zero upcrossing of heating

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Lake Vanajavesi: model for climate change impact
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Lake Vanajavesi: model for climate change impact

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Ice thickness cycle – albedo sensitivity, Prydz Bay
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Ice thickness cycle – albedo sensitivity, Prydz Bay

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Lake Ladoga: Finnish – Soviet – Russian data
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Lake Ladoga: Finnish – Soviet – Russian data

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Ice concentration A A = relative area of ice in the lake Freezing  depth: t = F(h) Hypsographic curve = G(h) Formally: A(t) = G[F-1(t)/max(h)
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Ice concentration A A = relative area of ice in the lake Freezing  depth: t = F(h) Hypsographic curve = G(h) Formally: A(t) = G[F-1(t)/max(h)

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Lake ice climatology, слайд №17
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Lake ice climatology, слайд №18
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Summary: warming (?)  Freezing day delays Max annual ice thickness likely decreases Ice quality (congelation ice/snow ice) ? Period of stable ice cover shortens Transient open water periods in smaller lakes than presently Ice breakup date likely earlier
Описание слайда:
Summary: warming (?)  Freezing day delays Max annual ice thickness likely decreases Ice quality (congelation ice/snow ice) ? Period of stable ice cover shortens Transient open water periods in smaller lakes than presently Ice breakup date likely earlier

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… consequences to water body Shorter ice season AND More sunlight More transient open water periods Improved oxygen level How winter ecology will be adapted?
Описание слайда:
… consequences to water body Shorter ice season AND More sunlight More transient open water periods Improved oxygen level How winter ecology will be adapted?

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Climate warming  Lake seasons
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Climate warming  Lake seasons

Слайд 22


Lake ice and society: climate change impact Lake ecology (+/- ?) Traffic on-ice Recreation: sport, fishing ice-water bathing Local weather changes warmer surfaces Open areas may persist  moisture fluxes, frazil ice Snow is main question!
Описание слайда:
Lake ice and society: climate change impact Lake ecology (+/- ?) Traffic on-ice Recreation: sport, fishing ice-water bathing Local weather changes warmer surfaces Open areas may persist  moisture fluxes, frazil ice Snow is main question!

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Теги Lake ice climatology
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