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SURFACE TURBULENT FLUX MEASUREMENTS AT SEARCH OBSERVATORY SITES

SURFACE TURBULENT FLUX MEASUREMENTS AT SEARCH OBSERVATORY SITES. P. O. G. Persson 1 , D. Costa 1 , A. Halevi 2 1 CIRES/NOAA/ETL, Boulder, Colorado 2 Summer Student Intern, Boulder, Colorado. OUTLINE Alert - sonic deployment: purpose, location, status

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SURFACE TURBULENT FLUX MEASUREMENTS AT SEARCH OBSERVATORY SITES

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  1. SURFACE TURBULENT FLUX MEASUREMENTS AT SEARCH OBSERVATORY SITES P. O. G. Persson1, D. Costa1, A. Halevi2 1CIRES/NOAA/ETL, Boulder, Colorado 2Summer Student Intern, Boulder, Colorado • OUTLINE • Alert • - sonic deployment: purpose, location, status • - analyses: R. Staebler data, 6 yrs of soundings/1 yr CMDL data, GFS validation, spatial variability (OSU/PSD simulations) • 2) Eureka • - instrument/tower deployment plans: purpose, siting • - deployment status: equipment purchases, deployment plans • - analyses: 6 years of soundings analyzed from fjord site • 3) Tiksi • - preliminary siting based on wind roses, preliminary instrument list

  2. Purpose: obtain turbulent sensible (& latent) heat fluxes to complement CMDL radiation measurements - validate/improve Arctic bulk flux parameterizations - complete SEB 2 ATI sonics with heaters & heater controllers delivered 11/3/05 DAS being finalized with heater control Sonics, DAS, mounting to be tested at BAO/Niwot Ridge during Nov-Dec Deployment to Alert ASAP after testing (January?) Alert Sonic Deployment CMDL Main Platform

  3. Alert Fluxes

  4. 1) analyze previous turbulent flux measurements (R. Staebler) 2) physical processes given by CMDL measurements (since 8/04) & sounding data (have 1/99-12/04 – hope to get 2005). 3) do 1 year SEB estimates from CMDL measurements with bulk flux parameterizations 4) GFS (NCEPs global model) validation 5) spatial variability of airflow, clouds, SEB using a) 2 years of MM5 simulations (D=54,18, 6 km; nz=32; I.C. 00 UTC AVN; 36-h fcst) by OSU (R. Samuelson) and b) own MM5/WRF simulation at D=1 km Alert Analyses

  5. Alert Analysis - GFS Validation Tair, Wind Speed, Psfc 12/18/04 – 5/3/05 BIAS RMSE CORR

  6. Alert Analysis - GFS Validation 12/18/04 – 5/3/05 LWd, LWup RMSE BIAS CORR

  7. Alert Analysis – Spatial Variability with MM5 54 km COAS at Oregon State Univ. P. Barbour and R. Samuelson D=54,18, 6 (151X88), 2 km; nz=32; I.C. 00 UTC AVN; 36-h fcst 18 km 6 km 2 km http://www-hce.coas.oregonstate.edu/~cmet/nares/

  8. Alert Analysis – Spatial Variability with MM5 D=6 km D=18 km IC: 00Z Nov3_05 D=54 km A A t = 0 h E t = 36 h

  9. Alert Analysis – Spatial Variability with MM5 D=54 km IC: 00Z Nov6_05 D=6 km D=18 km t = 0 h A A E t = 36 h

  10. Alert Analysis – Spatial Variability with MM5 D=54 km IC: 00Z Nov7_05 D=6 km D=18 km t = 0 h A A E t = 36 h

  11. Alert Analysis – Spatial Variability with MM5 D=54 km IC: 00Z Nov8_05 D=6 km D=18 km t = 0 h A A E t = 36 h

  12. Alert Analysis – Spatial Variability with MM5 . . MM5 Monthly Mean 10-m Winds 01/2005 08/2004

  13. Eureka (Ellsemere Island, Canada) Area Note possibility of unobstructed NNW-S airflow between 1-2 km along Eureka Sound & Nansen Sound • Eureka is in: • Polar region (80° N, 86° W) • a small fjord branching from larger fjords, 200 km from Arctic Ocean • c) region of complex terrain (terrain elevation > 1500 m within 150 km to W and NNE through SSE)

  14. 1) town site at river mouth to fjord at 10 m elevation 2) airstrip 2 km away at 80 m elevation 3) Slidre Fjord is oriented 110°-290° 4) An 8 km-wide valley is to the NNE with valley floor at 150-200 m 5) Ridges to NW and ENE reach 600-800 m at 8-10 km distance N Eureka Area- small scale

  15. Preferred Site

  16. Measurements: Motivations/Objectives • Surface Energy Budget • integrates effects of processes crucial for determining exchange between • surface and atmosphere • - e.g., net effects of clouds on surface • monitor effects of long-term (climate) changes in atmosphere • includes radiative, turbulent, and conductive fluxes Surface Energy Budget (SEB) : Ftot = Qsi - Qso + Qli - Qlo- Hs - Hl + C Ftot= net surface energy flux Qsi, Qso, Qli,and Qlo - incoming/outgoing shortwave/longwave radiative fluxes Hs, Hl - turbulent sensible/ latent heat fluxes C - conductive flux • Turbulent Fluxes (Hs, Hl) • - important component of SEB • bulk flux algorithms used in climate models need to be tested with data in • representative but poorly-sampled environments

  17. Alert/Eureka Instrument List

  18. INSTRUMENTATION

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