Summary
An experimental study focused on the urban-breeze circulation observed in Toulouse, South-West of France, during the Intensive Observation Period number 5 (IOP5, 3rd and 4th July 2004) of the CAPITOUL experiment (Feb. 2004 to Feb. 2005) is presented. The influence of the urban breeze circulation on the structure and the dynamics of the Atmospheric Boundary Layer is analysed by using ground stations, wind profilers (UHF radar), radio soundings and aircraft data. The IOP5 is a summertime anticyclonic situation with low wind, strong insulation and a deep boundary layer with a sheared wind profile.
The temporal and spatial relationship between the Surface Energy Balance (SEB), the diurnal evolution of the surface temperature and the dynamics of the airflow within the mixed layer are studied for urban and rural sites. The vertical and horizontal structure of the urban heat island are analysed from both surface stations and aircraft data. The nocturnal urban heat island reaches 5 °C. In the early morning, the city air becomes 1 °C cooler than in the countryside (due to efficient heat storage and building shade on the city urban canopy), then warmer again (1 °C) in the afternoon, due to negligible evaporation and strong sensible heat flux in the city. The daytime heat island is also present in altitude, being localized above the city centre at 350 m of height (1 °C) and advected to leeward at 1100 m of height (0.5 °C).
This diurnal heat island is associated to an urban-breeze circulation characterized by a surface convergence towards the city at low levels and a divergence in upper boundary layer. The urban breeze grows in intensity from 2 m s−1 (at 12.00 UTC) to 5–6 m s−1 (at 18.00 UTC). Aircraft measurements show that the urban breeze horizontal extension is 2 to 3 times larger than the city size.
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References
Atkinson BW (1981) Meso-scale atmospheric circulations. Academic Press, 195 pp
P Augustin H Delbarre F Lohou B Campistron V Puygrenier H Cachier T Lombardo (2006) ArticleTitleInvestigation of local meteorological events and their relationship with ozone and aerosols during an ESCOMPTE photochemical episode Ann Geophys 24 2809–2822 Occurrence Handle10.5194/angeo-24-2809-2006
SA Changnon (1981) METROMEX: a review summary. Monograph, No. 40 NumberInSeries18 American Meteorlogical Society Boston, USA
A Christen R Vogt (2004) ArticleTitleEnergy and radiation balance of a central European city Int J Climatol 24 1395–1421 Occurrence Handle10.1002/joc.1074
I Eliasson M Svensson (2003) ArticleTitleSpatial air temperatures, street geometry and land use Atmos Environ 30 379–392 Occurrence Handle10.1016/1352-2310(95)00033-X
Y Feliks (1994) ArticleTitleAn analytical model of the diurnal oscillation of the inversion base due to the sea-breeze J Atmos Sci 51 991–998 Occurrence Handle10.1175/1520-0469(1994)051<0991:AAMOTD>2.0.CO;2
K Finkele JM Hacker H Krauss RA Scott (1995) ArticleTitleA complete sea breeze circulation cell derived from aircraft observations Bound Layer Meteorol 73 299–317 Occurrence Handle10.1007/BF00711261
E Fisher (1960) ArticleTitleAn observational study of the sea breeze J Meteorol 17 645–660
CSB Grimmond TR Oke (1999) ArticleTitleHeat storage in urban areas: local-scale observations and evaluation of a simple model J Appl Meteorol 38 922–940 Occurrence Handle10.1175/1520-0450(1999)038<0922:HSIUAL>2.0.CO;2
Hidalgo J, Masson V, Pigeon G (2008) Urban-breeze circulation during the CAPITOUL experiment: numerical approach. Meteorol Atmos Phys (submitted)
JP Lafore et al. (1998) ArticleTitleThe Meso-NH atmospheric simulation system. Part I: adiabatic formulation and control simulations Ann Geophys 16 90–109 Occurrence Handle10.1007/s00585-997-0090-6
A Lemonsu V Masson (2002) ArticleTitleSimulation of a summer urban breeze over Paris Bound Layer Meteor 104 463–490 Occurrence Handle10.1023/A:1016509614936
A Lemonsu CSB Grimmond V Masson (2004) ArticleTitleModelling the surface energy balance of an old Mediterranean city core J Appl Meteorol 43 312–327 Occurrence Handle10.1175/1520-0450(2004)043<0312:MTSEBO>2.0.CO;2
A Lemonsu S Bastin V Masson P Drobinski (2006) ArticleTitleStratification of the urban boundary layer of marseille under sea-breeze condition: joint analysis of Doppler lidar and numerical simulations Bound Layer Meteor 118 477–501 Occurrence Handle10.1007/s10546-005-7772-y
A Lemonsu V Masson G Pigeon C Moppert (2006b) ArticleTitleSea-town interactions over marseille: 3d urban boundary layer and thermodinamical field near the surface Theor Appl Climatol 84 171–178 Occurrence Handle10.1007/s00704-005-0155-y
V Masson L Gomes G Pigeon C Liousse V Pont J-P Lagouarde J Voogt J Salmond TR Oke J Hidalgo D Legain O Garrouste C Lac O Connan X Briottet S Lachérade P Tulet (2008) ArticleTitleThe Canopy and Aerosol Particles Interactions in TOulouse Urban Layer (CAPITOUL) experiment Meteorol Appl Phys 102 135–157 Occurrence Handle10.1007/s00703-008-0289-4
H Nakane Y Sasano (1986) ArticleTitleStructure of a sea breeze front revealed by scanning lidar observation J Meteorol Soc Jpn 64 787–792
H Niino (1987) ArticleTitleThe linear theory of land and sea breeze circulation J Meteorol Soc Jpn 65 901–920
T Oke (2005) ArticleTitleTowards better scientific communication in urban climate Theor Appl Climatol 84 179–190 Occurrence Handle10.1007/s00704-005-0153-0
TR Oke (1981) ArticleTitleCanyon geometry and the nocturnal urban heat island: comparison of scale model and field observations Int J Climatol 1 237–254 Occurrence Handle10.1002/joc.3370010304
Oke TR (ed) (1987) Boundary layer climates. Methuen, London & York
TR Oke (1988) ArticleTitleThe urban energy balance Prog Phys Geogr 12 471–508 Occurrence Handle10.1177/030913338801200401
TR Oke R Sproken-Smith E Jàuregu S Grimmond (1999) ArticleTitleThe energy balance of centrel Mexico City during the dry season Atmos Environ 33 3919–3930 Occurrence Handle10.1016/S1352-2310(99)00134-X
G Pigeon A Lemonsu J Barrié P Durand V Masson (2006) ArticleTitleUrban thermodynamic island in a Coastal City analised from an optimized surface network Bound Layer Meteor 232 1–37
G Pigeon A Lemonsu CSB Grimmond P Durand O Thouron V Masson (2007a) ArticleTitleDivergence of turbulent fluxes in the surface layer: case of a coastal city Bound Layer Meteor 124 269–290 Occurrence Handle10.1007/s10546-007-9160-2
G Pigeon D Legain P Durand V Masson (2007b) ArticleTitleAnthropogenic heat release in an old European city (Toulouse, France) Int J Climatol 27 1969–1981 Occurrence Handle10.1002/joc.1530
R Rotunno (1983) ArticleTitleOn the linear theory of the land sea breeze J Atmos Sci 40 1999–2009 Occurrence Handle10.1175/1520-0469(1983)040<1999:OTLTOT>2.0.CO;2
JM Shepherd (2005) ArticleTitleA review of current investigations of urban-induced rainfall and recommendations for the future Earth Interactions 9 1–27 Occurrence Handle10.1175/EI156.1
J Unger Z Sümeghy A Gulyás Z Bottayán L Mucsi (2001) ArticleTitleLand-use and meteorological aspects of the urban heat island Meteorol Appl 8 189–194 Occurrence Handle10.1017/S1350482701002067
J Walsh (1974) ArticleTitleSea breeze theory and application J Atmos Sci 31 2012–2026 Occurrence Handle10.1175/1520-0469(1974)031<2012:SBTAA>2.0.CO;2
J White F Eaton A Auer (1978) ArticleTitleThe net radiation budget of the St. Louis metropolitan area J Appl Meteorol 17 593–599 Occurrence Handle10.1175/1520-0450(1978)017<0593:TNRBOT>2.0.CO;2
K Wilson A Goldstein E Falge M Aubinet D Baldocchi P Berbigier C Bernhofer R Ceulemans H Dolman C Field A Grelle A Ibrom B Law A Kowalski T Meyers J Moncrieff R Monson W Oechel J Tenhunen R Valentini S Verma (2002) ArticleTitleEnergy balance closure at FLUXNET sites Agric Forest Meteorol 113 223–243 Occurrence Handle10.1016/S0168-1923(02)00109-0
KK Wong RA Dirks (1978) ArticleTitleMesoscale perturbations on airflow in the urban mixing layer Amer Meteorol Soc 17 677–688
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Correspondence: Julia Hidalgo, FT2DC, Atmospheric Physics Area, University of Vigo, Ed. de Fisicas, As Lagoas, 32004 Ourense, Spain
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Hidalgo, J., Pigeon, G. & Masson, V. Urban-breeze circulation during the CAPITOUL experiment: observational data analysis approach. Meteorol Atmos Phys 102, 223–241 (2008). https://doi.org/10.1007/s00703-008-0329-0
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DOI: https://doi.org/10.1007/s00703-008-0329-0