Numerical simulation of cloud plumes emanating from Arctic leads

Burk, Stephen D.; Fett, Robert W.; Englebretson, Ronald E

doi:10.1029/97jd00339

Cited by 26 publications

(47 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Large heat fluxes for individual leads were observed in the lowest 30 m [54]. The vertical extent of plumes above leads depends on the thermal structure of the atmosphere, with stable stratifications prohibiting the development of large plumes above leads, and neutral stratification, e.g., after a front, allowing deeper plume penetration [22,47].…”

Section: Meteorologymentioning

confidence: 99%

“…There was a wider thin-ice region of 4-6 km width between dropsondes C6 and C7. As some studies have shown [47], the width of the open leads (or in this case the thin-ice lead with warmer skin temperature and greater heat flux) plays an important role for the amount of heat that actually gets into the atmosphere. Hence, the multi-km wide thin ice of case B will likely produce larger impacts than will the more numerous smaller leads of case C. Above regions of thin ice cover (e.g., dropsondes B3 and B4), the AABL height was enhanced compared to sondes above thick ice (B1 and B2) However, no clear correlation between surface skin temperature and the temperature recorded onboard the POLAR-5 at 100 m altitude was observed (Figure 10(a,b)).…”

Section: Meteorologymentioning

confidence: 99%

See 1 more Smart Citation

The Spring-Time Boundary Layer in the Central Arctic Observed during PAMARCMiP 2009

et al. 2012

View full text Add to dashboard Cite

Abstract:The Arctic atmospheric boundary layer (AABL) in the central Arctic was characterized by dropsonde, lidar, ice thickness and airborne in situ measurements during Above sea ice, a low AABL top, low near-surface temperatures, strong surface-based temperature inversions and an increase of moisture with altitude were observed. AABL properties and particle concentrations were modified by a frontal system, allowing vertical mixing with the free atmosphere. Above areas with many leads, the potential temperature decreased with height in the lowest 50 m and was nearly constant above, up to an altitude of 100-200 m, indicating vertical mixing. The increase of the backscatter coefficient towards the surface was high. Above sea ice with few refrozen leads, the stably stratified boundary layer extended up to 200-300 m altitude. It was characterized by low specific humidity and a smaller increase of the backscatter coefficient towards the surface.

show abstract

Section: Meteorologymentioning

confidence: 99%

Section: Meteorologymentioning

confidence: 99%

The Spring-Time Boundary Layer in the Central Arctic Observed during PAMARCMiP 2009

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The mentioned features of S D make the flux correction to a standard domain size unreasonable. It is worth mentioning that earlier LES [Glendening and Burk, 1992;Glendening, 1995;Shen and Leclerc, 1995;Burk et al, 1997;Weinbrecht and Raasch, 2001;Raasch and Harbusch, 2001] were conducted in domains with horizontal dimensions less than 2.5 km. The present sensitivity analysis suggests that such a small domain should seriously damage the turbulence statistics.…”

Section: Resolved Surface Temperature Flux and Convective Layer Depthmentioning

confidence: 99%

“…The ordinate is linear in (a) and logarithmic in (b). Runs from Table 1 (solid grey circles); runs from Table 2 (solid black circles); Zulauf and Krueger [2003] simulations (open squares); and Burk et al [1997] simulations (open triangles). Theoretical curves are solid: after equation (14); dotted: after equation (15) …”

Section: Convective Layer Depthmentioning

confidence: 99%

Amplification of turbulent exchange over wide Arctic leads: Large‐eddy simulation study

Esau¹

2007

J. Geophys. Res.

View full text Add to dashboard Cite

[1] Leads (narrow openings in the sea ice cover) are perhaps the most pronounced examples of heat islands naturally occurring on Earth. Large air-water temperature differences induce strong turbulent convection. In addition, large ice-water temperature differences induce more regular, breeze-like circulation at ice edges. Both the turbulent convection and the breeze result in intensive turbulent heat exchange between the ocean and the atmosphere. This study describes a series of turbulence-resolving experiments with the Large Eddy Simulation Nansen Center Improved Code (LESNIC). The numerical experiments quantify the turbulent heat exchange over leads of different widths. Contrary to the expected gradual decrease of the surface heat flux per unit area of open water, a strong amplification of the heat flux has been discovered for certain leads. This amplification results from a positive feedback between the horizontal entrainment of cool air in breeze and the turbulent heat exchange. Gradual reduction of the turbulent exchange for wider leads is thought to be due to development of self-organized structures in the convection. Pressure anomalies induced by the convective overturning could be comparable with the pressure anomalies due to the surface temperature difference. Their superposition limits the penetration of the cold breeze into the lead area. Without the horizontal entrainment, the near-surface temperature rises, reducing the average turbulent fluxes. In addition, the structures use the available kinetic energy to drive convective overturning. It also reduces the near-surface velocity and therefore fluxes. The maximum heat flux over open water was obtained for 2 km to 4 km leads. The maximum flux exceeds five-fold the flux in the homogeneous convection case. The revealed flux enhancement may have significant impact on the Arctic climate and more generally on the climate of urban areas and other heat islands. Therefore direct confirmation of the results from observational campaigns is urgently needed.

show abstract

“…Burk et al (1997) used a twodimensional steady state boundary layer model to investigate the formation of cloud plumes over leads. During April 1992, over the Beaufort Sea, they found that increasing wind speed resulted in an increase in lead fluxes, and that less stability caused lead-cloud formation on the downwind side.…”

Section: Introductionmentioning

confidence: 99%

Turbulent heat fluxes over leads and polynyas, and their effects on arctic clouds during FIRE.ACE: Aircraft observations for April 1998

Gültepe¹,

Isaac²,

Williams

et al. 2003

Atmosphere-Ocean

View full text Add to dashboard Cite

ACE) du Projet international d'établissement d'une climatologie des nuages à l'aide de données satellitaires (ISCCP) ont servi au calcul des flux de chaleur latente et de chaleur sensible au-dessus de chenaux et de polynies. L'étude a pour objet d'analyser les flux de chaleur turbulents associés aux caractéristiques de la surface de l'océan et d'en étudier les répercus-sions sur la formation des nuages dans l'Arctique. L'aéronef a survolé les chenaux et les polynies à une altitude d'environ 100 m. Des mesures prises à l'aide d'un simulateur LANDSAT (satellite des ressources terrestres), d'un radiomètre infrarouge PRT-5 aéroporté et d'un lidar de longueur d'onde de 1,064 m ont permis de préciser les caractéristiques de la surface de l'océan. Des mesures de la température de l'air, de la vitesse verticale de l'air et de la densité de la vapeur d'eau ont servi au calcul des flux. Les paramètres microphysiques des nuages (p. ex. concentration des gouttelettes, concentration des cristaux de glace et teneur en eau) ont été obtenus à l'aide de sondes optiques et de sondes à fil chaud. Les résultats indiquent qu'un chenal de

show abstract

Numerical simulation of cloud plumes emanating from Arctic leads

Cited by 26 publications

References 33 publications

The Spring-Time Boundary Layer in the Central Arctic Observed during PAMARCMiP 2009

The Spring-Time Boundary Layer in the Central Arctic Observed during PAMARCMiP 2009

Amplification of turbulent exchange over wide Arctic leads: Large‐eddy simulation study

Turbulent heat fluxes over leads and polynyas, and their effects on arctic clouds during FIRE.ACE: Aircraft observations for April 1998

Contact Info

Product

Resources

About