planetary boundary layer - fenix.ciencias.ulisboa.pt
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Planetary boundary layerLecture 7
Chap 6.1-6.4
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Homework
7.3 – Mariana
7.5 – Sara
7.6 – Cátia
7.7 – Diogo
7.12 – Florian
7.15 – Jason
7.18 – Maria
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From molecular processes to turbulence…
Effective turbulent flux includes molecular diffusion
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Micro layer (1 mm) (Fourier/Fick law)
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Effective flux is almost constant in the surface layer (z<50m)
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Surface energy balance
𝑄𝐻 − 𝑆𝑒𝑛𝑠𝑖𝑏𝑙𝑒 ℎ𝑒𝑎𝑡𝑄𝐸 − 𝐿𝑎𝑡𝑒𝑛𝑡 ℎ𝑒𝑎𝑡𝑄𝑆∗ −𝑁𝑒𝑡 𝑟𝑎𝑑𝑖𝑎𝑡𝑖𝑜𝑛
𝑄𝐺 − 𝑆𝑜𝑖𝑙 ℎ𝑒𝑎𝑡 𝑓𝑙𝑢𝑥
Upward >0
The external forcing is 𝑄𝑆∗ and all the other terms are response terms.
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Thin surface layer
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Typical fluxes
Daytime land Nightime land
Oasis: warm air over wet surface
Daytime sea
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Diurnal cycle over irrigated land (clear sky)
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𝑄∗- net radiation
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Radiation diurnal cycle (clear sky)
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Shortwave Radiation
Ψ 𝑡 = 𝑠𝑜𝑙𝑎𝑟 𝑒𝑙𝑒𝑣𝑎𝑡𝑖𝑜𝑛; 𝜎𝑋 represents the cloud-cover fraction
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Ψ 𝑡 = 𝑠𝑜𝑙𝑎𝑟 𝑒𝑙𝑒𝑣𝑎𝑡𝑖𝑜𝑛 = 90 − 𝜈
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albedo
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Longwave
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Fluxes at Interfaces (transport velocity)
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Surface Fluxes - Drag and Bulk Transfer Methods
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Heat and moisture
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Surface roughness is relevant
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Small scale
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Atmospheric PBL over oceans
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Stability
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Partitioning of Flux into Sensible and Latent Portions
Bowen
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Bowen ratio
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Penman-Monteith
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Ground heat flux
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Previous Homework
6.5 – Maria
6.7 – Mariana
6.10 – Sara
6.14 – Cátia
6.16– Diogo
6.17 – Florian
6.27 – Jason