Representing interactions between radiation and Earth's surface in large-scale models

Transcription

1 Reeenting intection between dition nd Eth ufce in lge-cle model Bend Pinty EC-JRC ntitute fo Envionment nd Sutinbility tly Seconded to the Eth Obevtion Diece ESA-ESRN Fcti tly 4 th ESA EO Summe School on Eth Sytem Monitoing nd Modelling Augut ESRN Fcti tly JRC

2 Sufce Albedo - the couled lndtmohee iue nd the ocited jgon Bend Pinty EC-JRC ntitute fo Envionment nd Sutinbility tly Seconded to the Eth Obevtion Diece ESA-ESRN Fcti tly 4 th ESA EO Summe School on Eth Sytem Monitoing nd Modelling Augut ESRN Fcti tly JRC

3 Lnd-ufce couling Sufce dition budget Atmoheic het fluxe E E Albedo i motly equied fo etimting how much dition i bobed in the lnd ufce ytem Ref: Selle et l Science

4 Need of Atmoheic Model with eect to Sufce lbedo oduct To eeent the tio of uwd to downwd dint fluxe i.e. Albedo integted ove ome ectl domin e.g. [.3-.7] nd [.7-3.] : Fo ny given Sun oition tht i ny model gid cell t ny time of the dy nd eon Fo ny bity tte nd comoition of the ovelying tmohee tht i ny ticul idince field eulting fom the ditibution of cloud nd eool geneted by the model

5 Atmohee δ to diff B di + to to Ce of blck-ufce : the tivil couling oblem All quntitie e monochomtic

6 Atmohee δ to diff m diff B di d μ to to Lnd-ufce couling oblem All quntitie e monochomtic

7 2 d HDRF μ The Hemiheicl-Diectionl Reflectnce Fcto HDRF The HDRF cn be meued loclly in itu nd it deend on numbe of tmoheic nd ufce ttibute All quntitie e monochomtic

8 2 2 + d d BHR μ μ The Albedo o the Bi-Hemiheicl Reflectnce Fcto BHR The lbedo o BHR cn be meued loclly in itu but it deend on numbe of tmoheic nd ufce ttibute All quntitie e monochomtic

9 Uul imlifiction nd oxie 1 - Aume tht the ufce i Lmbetin with eect to ll ouce of illumintion 2 d μ E E E All quntitie e monochomtic iotoic illumintion ouce t the bottom of the tmohee

10 d d BRF diff di μ μ Uul imlifiction nd oxie 2 - Aume tht ufce i Lmbetin with eect to the diffue umed iotoic illumintion ex 1 2 μ μ δ diff E d BRF + ex μ μ diff E BRF BRF + All quntitie e monochomtic umed iotoic t the bottom of the tmohee

11 Uul imlifiction nd oxie 3 All quntitie e monochomtic ex μ μ di BRF BRF The BRF cnnot be meued in itu but in the lbotoy diff diff E The lbedo unde iotoic diffue illumintion lo clled the White Sky Albedo cn obbly be oximted in itu unde ovect condition

12 The RPV metic model The RPV metic model BRF ρ Mk FHGΘ H ρc ρ - contol mlitude level k - contol bowl/bell he Θ - contol fowd/bckwd ctteing ρc - contol hot ot ek Ref: Rhmn et l JGR

13 2 2 + d d BHR μ μ The Albedo o the Bi-Hemiheicl Reflectnce Fcto BHR The lbedo o BHR cn be meued loclly in itu but it deend on numbe of tmoheic nd ufce ttibute All quntitie e monochomtic

14 All quntitie e monochomtic diff di f f DHR BHR + Bck to the Albedo o BHR vi the DHR1 Pinty etl. 25: Jounl of the Atmoheic Science - Aume tht ufce i Lmbetin with eect to the umed diffue iotoic illumintion ex di E f μ μ diff diff E E f d BRF DHR μ The Diectionl Hemiheicl Reflectnce fcto DHR o Blck Sky lbedo deend on ufce oetie only but it cnnot be meued in itu

15 All quntitie e monochomtic The Blue ky lbedo diff di f f DHR BHR + Pinty etl. 25: Jounl of the Atmoheic Science - Coneving ome level of diectionlity in the incoming diffue illumintion The couled contibution The decouled contibution diff di f f DHR BHR ζ + +

16 BRF Bowl-he 1-D BRF Bell-he 3-D Pinty etl. 25: Jounl of the Atmoheic Science

17 Adoting the Blue ky Albedo meteition? Geneting ectlly integted bodbnd viible nd ne-infed Blck o DHR nd White BHR io ky lbedo equie olving eie of comlicted oblem: A couled lnd-tmohee dition tnfe invee oblem: mke the bet oible ue of intument cbilitie to incee the contint on the oible olution Angul integtion ove viou hemihee: equie uing metic BRF model Conveion fom noly of now bnd meuement to bodbnd etimte: equie uing exiting in itu eflectnce meuement nd/o model imulted cenio

18 Otiml Retievl of Sufce Poetie Uing Oetionl Sufce Albedo Poduct Bend Pinty EC-JRC ntitute fo Envionment nd Sutinbility tly Seconded to the Eth Obevtion Diece ESA-ESRN Fcti tly 4 th ESA EO Summe School on Eth Sytem Monitoing nd Modelling Augut ESRN Fcti tly JRC

19 How doe dition editibute enegy between the tmohee nd the biohee? Sctteed Fluxe by the ufce Abobed Fluxe in Vegettion Abobed Fluxe in Soil

20 Wht do we meue t globl cle tht we hould model well? Albedo of the ufce in the VS nd NR MODS nd MSR Abobed Flux by geen Vegettion in the VS FAPAR

21 How do we model the bobed fluxe in vegettion nd oil? Coect titioning between the flux tht i bobed : 1- in the vegettion lye VS A veg VS+NR 1 ALB fc A gound 2- in the bckgound A gound T veg 1 gound Aement of the fction of ol dint flux tht i ctteed lbedo by tnmitted though nd bobed in the vegettion lye Pinty etl. 26: Jounl of Geohyicl Reech doi:1.129/25jd5952

22 Wht e the need? Udte/imove the cuent Lnd Sufce cheme decibing the dition tnfe ocee in vegettion cnoie ee 2-tem model by Pinty et l. JGR 26.

23 Requiement fom 2-tem model 3 effective tte vible: 1. Oticl deth: LA 2. ingle ctteing lbedo : Lef eflectnce+ Lef tnmittnce 3. ymmety of the he function Lef eflectnce/tnmittnce 2 boundy condition: 1. To: Diect nd Diffue tmoheic fluxe known 2. Bottom : Flux fom bckgound Albedo unknown Pinty etl. 26: Jounl of Geohyicl Reech doi:1.129/25jd5952

24 Decomoe the comlex oblem into imle oblem to olve DHR μ ρ DHR Collided μ ρ fc vegettion ρ [ ] DHR Uncollided bckgound μ fc fc [ + ] + Collided ρ DHRbckgound μ ρ fc fc Blck Bckgound Blck Cnoy Cnoy -Bckgound Regulte the botion ocee ocited with vegettion hotoynthei Stongly deend on the denity of geen vegettion No botion oce by vegettion ocited with thi wvelengthindeendent contibution Stongly contolled by 3-D ditibution of vegettion chitectue Contolled by multile ctteing event between the bckgound nd the cnoy Motly negligible contibution in the viible domin of the ol ectum Ref: Pinty et l. 24 Jounl Geohyicl Reech doi:1129/24jd5214

25 The concet of effective LA Tue <LA> 2. Tue <LA> 2. 3-D heteogeneou ytem Diect tnmiion t 3 degee Sun enith ngle T diect < LA > 3 D.596 T diect 1 D 1-D ytem eeenttion Diect tnmiion t 3 degee Sun enith ngle < LA > < LA > ex μ Effect induced by intenl vibility of LA

26 Wht e the need? Udte/imove the cuent Lnd Sufce cheme decibing the dition tnfe ocee in vegettion cnoie ee 2-tem model by Pinty et l. JGR 26. Pee fo the ingetion/imiltion of RS flux oduct into Lnd Sufce cheme Retieve 2-tem model mete fom RS flux oduct

27 The me RT model mut be ued in invee mode nd in fowd mode to enue conitency between RS oduct nd lge cle model imultion

28 Retievl of model Pmete fo Lnd ufce cheme The invee oblem cn be fomulted in ode to find olution otimiing ll the vilble infomtion i.e. infeing ttiticlly the tte of the ytem Towd n integted ytem fo the otiml ue of emote ening flux oduct

29 JRC-Two-tem nveion Pckge: JRC-TP RS flux oduct fom viou ouce + uncetintie Pio knowledge on model mete + uncetintie Ancilly infomtion e.g. occuence of now nd wte Re-nlyi geneting conitent dtet Time-indeendent oeting mode Rdition tnfe model Dignotic fluxe + uncetintie Poteio model mete + uncetintie

30 NPUTS : io knowledge RS Flux oduct e.g. Albedo Vi/NR nd/o FAPAR noted d Udted/benchmked 2-tem model fom Pinty et l. JGR 26 noted M X A ioi knowldege/gue on model mete noted X io uncetinty on the RS oduct i ecified in the meuement et covince mtix C d uncetinty ocited the model mete i ecified vi covince mtix C X io

31 J X 1 2 The coe of the JRC-TP [ ] T 1 T 1 M X d C M X d + X X C X X d io X io io Model mete 2-tem model meuement Pmete knowledge Uncetinty meuement Uncetinty mete Comute otimied Adjoint nd Hein model of cot function fom utomtic diffeentition technique Aume Guin theoy Poteio uncetintie on etieved mete e etimted fom the cuvtue of J X Pinty etl. 27: Jounl of Geohyicl Reech in e

32 OUTPUTS: oteio knowledge PDF of ll 2-tem model mete: PDF X ex 1 2 Flux ot X X C GC ot X T C 1 X ot G ot T X X Aeement of ll fluxe edicted by the 2-tem model nd thei ocited uncetinty: ot oteioi uncetinty covince mtix Pinty etl. 27: Jounl of Geohyicl Reech in e

33 Aliction eult gint model-bed tndd cenio

34 ioi knowledge on model mete 1. A-ioi PDF on Sectl Pmete.8 Reflectnce [.7μm - 2.5μm] leve oil now σ io LA io LA Reflectnce [.4μm -.7μm] Pinty etl. 27: Jounl of Geohyicl Reech in e

35 Aliction eult gint modelbed tndd cenio Aliction with meuement et d including viou combintion of viible nd ne-infed bodbnd dint fluxe i. e. Albedo R Tnmiion T nd Abotion A PDF fo 7 model mete to be etimted: LA Lef nd bckgound oetie in the two ectl domin

36 ioi covince mtix LA ω l λ 1 d l λ 1 g λ 1 ω l λ 2 d l λ 2 g λ 2 LA ω l λ 1 d l λ 1 g λ 1 Pioi ω l λ 2 d l λ 2 g λ 2 Coeltion

37 Retievl of LA model-bed ce 1 8 σ io LA LA ot 6 4 σ ot LA LA tue σ LA LA tue ot LA ot

38 Single ctteing lbedo LA<4 LA>4 Bckgound lbedo Retievl in Viible domin g λ 1 ot ω l λ 1 ot σ io LA ω l λ 1 tue σ io LA σ ot ω l λ 1 σ ot g λ σ io LA ω l λ 1 tue.2 σ io LA RA g λ 1 tue g λ 1 tue

39 oteioi covince mtice LA ω l λ 1 d l λ 1 g λ 1 ω l λ 2 d l λ 2 g λ 2 Lef Ae ndex LA VSBLE Ne-nfRed Single ctteing lbedo Aymmety he function Bckgound lbedo Single ctteing lbedo Aymmety he function Bckgound lbedo ω l λ 1 d l λ 1 g λ 1 ω l λ 2 d l λ 2 g λ 2 RRA Uing the bobed nd ctteed flux only Coeltion

40 Concluding emk 1. Sufce lbedo cove diffeent hyicl quntitie: get ce i ecommended when uing uch vlue fom viou ovide 2. Comute efficient inveion ckge h been deigned nd teted : etimte of uncetinty on ll etievl including coeltion 3. Thi integted ckge cn be ued fo viou uoe : etievl of mete fom RS oduct vlidtion of RS oduct imiltion of RS oduct into Lnd ufce cheme.

41