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Geophysical Turbulence Research: Collaborations and Technological Requirements

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johnda
16 diapositives · 362 Views · Oct 30, 2013

The crucial collaboration among numerical modelers, laboratory simulators, and observational scientists in the study of geophysical turbulence. It highlights the scientific challenges that require advancements in large-eddy simulation models, particularly in complex flow regimes and planetary boundary layers. The necessity for improved measurement technologies such as lidar and radar, with better spatial and temporal resolutions, is emphasized. Additionally, it discusses potential sensor developments and new platforms for enhanced observational capabilities in atmospheric studies.

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  1. GEOPHYSICAL TURBULENCE Geophysics − The physics of the earth and its environment, that is, earth, air, and (by extension) space. Scientific and observational needs Lenschow - ATD retreat - 23 Jan 04

  2. PHILOSOPHICAL CONSIDERATIONS • Close collaboration is essential between numerical modelers, laboratory simulators and observers. • Progress in one area depends on progress in the others. Lenschow - ATD retreat - 23 Jan 04

  3. SCIENTIFIC PROBLEMS • Improve sub-filter scale parameterizations in large-eddy simulation models • Investigate complex flow regimes • heterogeneous terrain • stable planetary boundary layer • turbulent layers in stably-stratified regions from the PBL to the stratosphere • “wall” flow regimes • Study structures in turbulent flow • vortices • microfronts • rolls and cells Lenschow - ATD retreat - 23 Jan 04

  4. Shallow Drainage Flows – Mahrt, Vickers, Nakamura, Soler, Sun, Burns, & Lenschow – BLM, 101, 2001. Schematic cross-section of prevailing southerly synoptic flow, northerly surface flow down The gully, and easterly flow likely drainage flow from Flint Hills. Numbers identify the Sonic anemometers on the E-W transect. E is to the right and N into the paper. Lenschow - ATD retreat - 23 Jan 04

  5. Two RHI lidar scans from HRDL in CASES-99 illustrating the time de- pendence of waves. (a) at 05:30:49 UTC; (b) at 05:34:24 UTC. Note that the vertical scale is 7.5 times the hori- Zontal scale. Lidar Resolution 30 m. (From Blumen et al., Dynamics of Atmospheres and Oceans, 2001, Fig. 4, p. 197). Lenschow - ATD retreat - 23 Jan 04

  6. Lenschow - ATD retreat - 23 Jan 04

  7. NEW TECHNOLOGY REQUIREMENTS • Better spatial and temporal resolution for both in situ and remote (e.g. lidar and radar) measurements, including both scalars and velocity components • Greater coverage of observational domain (i.e. larger ratio of largest resolved scale to smallest resolved scale) and better integration of measurements from instrument arrays (e.g. Intelligent Sensor Array) • More accurate measurements of flow structures - from smallest scales (e.g. surface-layer eddies of 10’s of cms) to largest scales (e.g. pockets of cells, or lines of rolls of 10’s of kms) Lenschow - ATD retreat - 23 Jan 04

  8. POSSIBLE SENSOR DEVELOPMENTS • Ground-based in situ sensors • IR humidity • Tsinober turbulence probe • Larger instrument arrays for • hetereogeneous terrain studies • subfilter-scale parameterization studies • Faster, smaller, cheaper (and more robust) sensors • Laser Doppler anemometer (smaller scale & higher resolution?) • …………. Lenschow - ATD retreat - 23 Jan 04

  9. Tsinober Probe Measures , 3 components of , 9 components of and , and , 3 components of Lenschow - ATD retreat - 23 Jan 04

  10. zs = 6.90m, dys = 6.70m zd = 3.45m, dyd = 3.35m ARRAY-1 Lenschow - ATD retreat - 23 Jan 04

  11. ARRAY-4 zs = 5.15m dys = 0.63m zd = 4.15m dyd = 0.50m Lenschow - ATD retreat - 23 Jan 04

  12. IMPORTANT SCIENCE ISSUES • Reconstructing atmospheric data from laboratory templates • Comparing remote (e.g. lidar or radar) measurements with in situ measurements (e.g. velocity or trace constituents) • …... • …... Lenschow - ATD retreat - 23 Jan 04

  13. Lenschow - ATD retreat - 23 Jan 04

  14. POSSIBLE SENSOR DEVELOPMENTS • Remote • trace constituent and air velocity lidars with fine-scale resolution for ground and mobile platforms • millimeter Doppler radar • portable VHF wind profiler • ….. • ….. Lenschow - ATD retreat - 23 Jan 04

  15. POSSIBLE SENSOR DEVELOPMENTS • Aircraft • fine-scale temperature in cloud • fine-scale humidity measurement • fine-scale trace constituent measurement • laser velocity measurement (3-D) • velocity difference measurements (via pressure differences) • fine-scale ocean waves via lidar or radar • ….. • ….. Lenschow - ATD retreat - 23 Jan 04

  16. NEW PLATFORMS • Unmanned Aerial Vehicles (UAV) • TRAnsect Measurement (TRAM) • Balloon- and kite-borne sensor packages • ….. • ….. Lenschow - ATD retreat - 23 Jan 04