Fine Scale Meteorology & Air Quality Models - School of Architecture ...

More documents

Recommendations

Info

ASI2_Lecture 3_7/12/2011 Model study of Vortices in high-resolution WRF Courtesy of E. Gutierrez, J. Gonzalez, CCNY, & R. Bornstein, SJSU Simulations of a 2010 NYC Heat Wave: Real or Noise z=12 m, 18 EST; coarse domain, ∆x=9 km, ∆t = 1 s: Temperature (12m) W velocity (12m) Reasonable results, but not much detail ASI 2: URBAN CLIMATE AND AIR POLLUTION School of Architecture, The Chinese University of Hong Kong, Hong Kong, 7-8 Dec 2011 Sensitivity to ∆x Temperature (12m) ∆t fixed at 1 s Vertical velocity (12m) ∆X=1 km ∆X=333 m ∆X=1 km ∆X=333 m W (12m) X-section thru Manhattan ∆X=1 km ∆X=333 m ASI 2: URBAN CLIMATE AND AIR POLLUTION School of Architecture, The Chinese University of Hong Kong, Hong Kong, 7-8 Dec 2011 24
ASI2_Lecture 3_7/12/2011 Sensitivity to ∆t; ∆x = 1 km Vertical Velocity x-section through Manhattan ∆t=6 s ∆t=1 s ∆t=0.66 s ∆t=0.11 s ASI 2: URBAN CLIMATE AND AIR POLLUTION School of Architecture, The Chinese University of Hong Kong, Hong Kong, 7-8 Dec 2011 Terra Incognita LES and mesoscale limits From Wyngaard •If the (integral) scale of the turbulence is l, then in the LES limit, i.e., ∆ ≪ l, the numerical grid resolves all of the energy-containing turbulence. •The subgrid model is responsible only for energy transfer from the resolved scales. The standard Smagorinsky (or Lilly) subgrid model produces this transfer at the correct mean rate. •In the mesoscale limit, ∆ ≫ l, no turbulence is resolved. Turbulence effects are represented through a subgrid model, typically of the ensemble-mean type. In principle the subgrid model can be adjusted to perform well in this limit. •Between these two limits lies the Terra Incognita where the subgrid model carries significant fluxes and transfers energy. In principle neither ensemble mean nor the traditional LES closures are appropriate there. ASI 2: URBAN CLIMATE AND AIR POLLUTION School of Architecture, The Chinese University of Hong Kong, Hong Kong, 7-8 Dec 2011 25
Page 1 and 2: ASI2_Lecture 3_7/12/2011 Croucher A
Page 3 and 4: ASI2_Lecture 3_7/12/2011 Multi-Scal
Page 5 and 6: ASI2_Lecture 3_7/12/2011 PBL scheme
Page 7 and 8: ASI2_Lecture 3_7/12/2011 Part 2b: U
Page 9 and 10: ASI2_Lecture 3_7/12/2011 Sources of
Page 11 and 12: ASI2_Lecture 3_7/12/2011 HYPOTHESIS
Page 13 and 14: ASI2_Lecture 3_7/12/2011 Geo‐Refe
Page 15 and 16: ASI2_Lecture 3_7/12/2011 Cooling Ca
Page 17 and 18: ASI2_Lecture 3_7/12/2011 Crossroads
Page 19 and 20: ASI2_Lecture 3_7/12/2011 ACM-2 BouL
Page 21 and 22: ASI2_Lecture 3_7/12/2011 erturbatio
Page 23: ASI2_Lecture 3_7/12/2011 Suggested
Page 27 and 28: ASI2_Lecture 3_7/12/2011 Dependence
Page 29 and 30: ASI2_Lecture 3_7/12/2011 HCHO Histo
Page 31 and 32: ASI2_Lecture 3_7/12/2011 SGV parame

Fine Scale Meteorology & Air Quality Models - School of Architecture ...

Create successful ePaper yourself

Delete template?

Save as template?