scholarly journals Beijing aerosol: Atmospheric interactions and new trends

2007 ◽  
Vol 112 (D14) ◽  
Author(s):  
Benjamin Guinot ◽  
Hélène Cachier ◽  
Jean Sciare ◽  
Yu Tong ◽  
Wang Xin ◽  
...  
Keyword(s):  
Atmospheric Interactions

scholarly journals Observed Key Surface Parameters for Characterizing Land–Atmospheric Interactions in the Northern Marginal Zone of the Taklimakan Desert, China

Atmosphere ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 458 ◽  
Author(s):  
Lili Jin ◽  
Zhenjie Li ◽  
Qing He ◽  
Yongqiang Liu ◽  
Ali Mamtimin ◽  
...  
Keyword(s):  
Wind Speed ◽  
Marginal Zone ◽  
Peak Frequency ◽  
Estimation Methods ◽  
Taklimakan Desert ◽  
Prevailing Wind ◽  
Surface Parameters ◽  
The Taklimakan Desert ◽  
The Mean ◽  
Atmospheric Interactions

An observational data set of the year 2010 at a site in the northern marginal zone of the Taklimakan Desert (TD) was used to analyse the key surface parameters in land–atmospheric interactions in the desert climate of northwest China. We found that the surface albedo (α) and emissivity (ε) were 0.27 and 0.91, respectively, which were consistent with the values obtained based on observations in the hinterland of the TD as well as being similar to the dry parts of the Great Basin desert in North America, where they were comparable to the α and ε values retrieved from remote sensing products. Peak frequency value of z0m was 5.858 × 10−3 m, which was similar to the Mojave Desert, Peruvian desert, Sonoran Desert, HEIFE (Heihe region) Desert, and Badain Jaran Desert. The peak frequency value of z0h was 1.965 × 10−4 m, which was different from those obtained in the hinterland of the TD. The average annual value of excess resistance to heat transfer (kB−1) was 2.5, which was different from those obtained in the HEIFE Gobi and desert, but they were similar to those determined for the Qinghai–Tibetan Plateau and HAPEX-Sahel. Both z0m and z0h varied less diurnally but notably seasonally, and kB−1 exhibited weak diurnal and seasonal variations. We also found that z0m was strongly influenced by the local wind direction. There were many undulating sand dunes in the prevailing wind and opposite to the prevailing wind, which were consistent with the directions of the peak z0m value. The mean values calculated over 24 h for Cd and Ch were 6.34 × 10−3 and 5.96 × 10−3, respectively, which were larger than in the Gobi area, hinterland of the TD and semiarid areas, but similar to HEIFE desert. Under the normal prevailing (NNE–ESE) wind, the mean bulk transfer coefficient Cd and Ch were of the same order of magnitude as expected based on similarity theory. Using the data obtained under different wind directions, we determined the relationships between Cd, Ch, the wind speed U, and stability parameter z/L, and the results were different. Cd and Ch decreased rapidly as the wind speed dropped below 3.0 m s−1 and their minimum values reached around 1–2 m s−1. It should also be noted that the ε values estimated using the sensible heat flux (H) were better compared with those produced using other estimation methods.

Atmospheric interactions with wildland fire behaviour - I. Basic surface interactions, vertical profiles and synoptic structures

2012 ◽  
Vol 21 (7) ◽  
pp. 779 ◽  
Author(s):  
Brian E. Potter
Keyword(s):  
Scientific Literature ◽  
Wildland Fire ◽  
Companion Paper ◽  
Surface Interactions ◽  
Future Research ◽  
Vertical Profiles ◽  
Fire Behaviour ◽  
Plume Dynamics ◽  
Atmospheric Profiles ◽  
Atmospheric Interactions

This paper is the first of two reviewing scientific literature from 100 years of research addressing interactions between the atmosphere and fire behaviour. These papers consider research on the interactions between the fuels burning at any instant and the atmosphere, and the interactions between the atmosphere and those fuels that will eventually burn in a given fire. This first paper reviews the progression from the surface atmospheric properties of temperature, humidity and wind to horizontal and vertical synoptic structures and ends with vertical atmospheric profiles. (The companion paper addresses plume dynamics and vortices.) The review reveals several unanswered questions, as well as findings from previous studies that appear forgotten in current research and concludes with suggestions for areas of future research.

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