Quantitative study of net radiation from MODIS data in the lower boundary layer in Poyang Lake area of Jiangxi Province, China

2007 ◽  
Vol 28 (19) ◽  
pp. 4381-4389 ◽  
Author(s):  
G. Cai ◽  
Y. Xue ◽  
Y. Hu ◽  
J. Guo ◽  
Y. Wang ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Quantitative Study ◽  
Poyang Lake ◽  
Lower Boundary ◽  
Jiangxi Province ◽  
Lake Area ◽  
Net Radiation ◽  
Modis Data ◽  
Poyang Lake Area ◽  
Lower Boundary Layer

Physiological and Biochemical Characteristics and Desilication Ability of Bacillus Mucilaginosus Screened from Poyang Lake Area of Jiangxi Province

2011 ◽  
Vol 308-310 ◽  
pp. 1604-1608
Author(s):  
Li Ming Zhang ◽  
De Si Sun ◽  
Yang Bo
Keyword(s):  
Nitrogen Source ◽  
Poyang Lake ◽  
Jiangxi Province ◽  
Lake Area ◽  
Free Medium ◽  
Bacillus Mucilaginosus ◽  
Biochemical Characteristics ◽  
Physiological And Biochemical Characteristics ◽  
Poyang Lake Area ◽  
Physiological And Biochemical

18 strains of Bacillus mucilaginosus were sampled from Poyang Lake area of Jiangxi province in China . Morphology and physio-biochemical characteristics and desilication ability on bauxite were studied. The results showed that all strains are rods and produced spores from elliptical to circular， while strains of P8、P11、P15 are short rod. Gram reaction of 18 strains are negative.The strains can use nitrites and ammonium salt as nitrogen source, and survived in the nitrogen free medium. P4、P3 showed strong desilication ability, compared to blank control the content of soluble SiO2 increased to 4.57、4.13 times respectively; P2、 P7、P9 could tolerate 4% NaCl and were growing well at the temperature ranging from 25~35 °C.

Screening of KSB in Red Soil of Poyang Lake Area and Potassium Solubilizing Study

2013 ◽  
Vol 838-841 ◽  
pp. 2552-2555
Author(s):  
Li Ming Zhang ◽  
Juan Juan Liu ◽  
Hai Yan Hu
Keyword(s):  
Low Temperature ◽  
Poyang Lake ◽  
Low Ph ◽  
Red Soil ◽  
Jiangxi Province ◽  
Lake Area ◽  
Soil Medium ◽  
Poyang Lake Area ◽  
Potassium Solubilizing Bacteria

29 strains of KSB(potassium solubilizing bacteria) were sampled from red soil of Poyang Lake area of Jiangxi province in China. Potassium solubilizing screening and temperature and pH tolerate experiments were conducted in red soil medium: 5 strains include K10, K12, K14, K16,K29 with better potassium solubilizing ability were screened. Further study shows K16 performs better at low temperature of 15-25°C, while K12 keeps active at a temperature of 40°C, All strains show biggest potassium solubilizing ability at pH6.5 except K10 at pH5.5. And K10 stays active at a low pH of 3.5-5.5.

Poyang Lake Region Precipitation Singular Spectrum Analysis

2014 ◽  
Vol 955-959 ◽  
pp. 3006-3010 ◽  
Author(s):  
Jian Ying Wang ◽  
Pan Pan Zhang ◽  
Shu Sen Pang
Keyword(s):  
Time Series ◽  
Spectrum Analysis ◽  
Poyang Lake ◽  
Singular Spectrum Analysis ◽  
Periodic Oscillation ◽  
Jiangxi Province ◽  
Rainfall Time Series ◽  
Lake Area ◽  
Singular Spectrum ◽  
Poyang Lake Area

Poyang Lake is located in the northern part of Jiangxi Province, is one of the important Yangtze River flood storage lakes. Use Mann-Kendall test the trends and mutation of the Poyang Lake area rainfall time series, and use singular spectrum analysis (SSA) method to analyze the time series of periodic oscillation characteristics. The results showed that, the Poyang Lake area rainfall time series no significant upward or downward trend, there are quasi 4-5 years, 8-11 years, 20-year periodicity.

Hydrodynamics and behaviour of Simuliidae larvae (Diptera)

1986 ◽  
Vol 64 (6) ◽  
pp. 1295-1309 ◽  
Author(s):  
M. M. Chance ◽  
D. A. Craig
Keyword(s):  
Boundary Layer ◽  
Lower Boundary ◽  
The Body ◽  
The Other ◽  
Avoidance Reaction ◽  
Larval Body ◽  
Video Recordings ◽  
Von Karman ◽  
Von Kármán ◽  
Lower Boundary Layer

Detailed water flow around larvae of Simulium vittatum Zett. (sibling IS-7) was investigated using flow tanks, aluminium flakes, pigment, still photography, cinematography, and video recordings. Angle of deflection of a larva from the vertical has a hyperbolic relationship to water velocity. Velocity profiles around larvae show that the body is in the boundary layer. Frontal area of the body decreases as velocity increases. Disturbed larvae exhibit "avoidance reaction" and pull the body into the lower boundary layer. Longitudinal twisting and yawing of the larval body places one labral fan closer to the substrate, the other near the top of the boundary layer. Models and live larvae were used to demonstrate the basic hydrodynamic phenomenon of downstream paired vortices. Body shape and feeding stance result in one of the vortices remaining in the lower boundary layer. The other rises up the downstream side of the body, passes through the lower fan, then forms a von Karman trail of detaching vortices. This vortex entrains particulate matter from the substrate, which larvae then filter. Discharge of water into this upper vortex remains constant at various velocities and only water between the substrate and top of the posterior abdomen is incorporated into it. The upper fan filters water only from the top of the boundary layer. Formation of vortices probably influences larval microdistribution and filter feeding. Larvae positioned side by side across the flow mutually influence flow between them, thus enhancing feeding. Larvae downstream of one another may use information from the von Karman trail of vortices to position themselves advantageously.

scholarly journals Evaluation of simulated aerosol properties with the aerosol-climate model ECHAM5-HAM using observations from the IMPACT field campaign

2010 ◽  
Vol 10 (16) ◽  
pp. 7709-7722 ◽  
Author(s):  
G.-J. Roelofs ◽  
H. ten Brink ◽  
A. Kiendler-Scharr ◽  
G. de Leeuw ◽  
A. Mensah ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Climate Model ◽  
Lower Boundary ◽  
Synoptic Scale ◽  
Concentration Gradients ◽  
Cloud Properties ◽  
Dry Conditions ◽  
Strong Exchange ◽  
The Impact ◽  
Lower Boundary Layer

Abstract. In May 2008, the measurement campaign IMPACT for observation of atmospheric aerosol and cloud properties was conducted in Cabauw, The Netherlands. With a nudged version of the coupled aerosol-climate model ECHAM5-HAM we simulate the size distribution and chemical composition of the aerosol and the associated aerosol optical thickness (AOT) for the campaign period. Synoptic scale meteorology is represented realistically through nudging of the vorticity, the divergence, the temperature and the surface pressure. Simulated concentrations of aerosol sulfate and organics at the surface are generally within a factor of two from observed values. The monthly averaged AOT from the model is 0.33, about 20% larger than observed. For selected periods of the month with relatively dry and moist conditions discrepancies are approximately −30% and +15%, respectively. Discrepancies during the dry period are partly caused by inaccurate representation of boundary layer (BL) dynamics by the model affecting the simulated AOT. The model simulates too strong exchange between the BL and the free troposphere, resulting in weaker concentration gradients at the BL top than observed for aerosol and humidity, while upward mixing from the surface layers into the BL appears to be underestimated. The results indicate that beside aerosol sulfate and organics also aerosol ammonium and nitrate significantly contribute to aerosol water uptake. The simulated day-to-day variability of AOT follows synoptic scale advection of humidity rather than particle concentration. Even for relatively dry conditions AOT appears to be strongly influenced by the diurnal cycle of RH in the lower boundary layer, further enhanced by uptake and release of nitric acid and ammonia by aerosol water.

scholarly journals Resolution Dependence of Turbulent Structures in Convective Boundary Layer Simulations

Atmosphere ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 986 ◽  
Author(s):  
Mary-Jane M. Bopape ◽  
Robert S. Plant ◽  
Omduth Coceal
Keyword(s):  
Boundary Layer ◽  
Heat Flux ◽  
Convective Boundary Layer ◽  
Inversion Layer ◽  
Lower Boundary ◽  
Quadrant Analysis ◽  
Turbulent Structures ◽  
Convective Boundary ◽  
Large Eddy ◽  
Lower Boundary Layer

Large-eddy simulations are performed using the U.K. Met Office Large Eddy Model to study the effects of resolution on turbulent structures in a convective boundary layer. A standard Smagorinsky subgrid scheme is used. As the grid length is increased, the diagnosed height of the boundary layer increases, and the horizontally- and temporally-averaged temperature near the surface and in the inversion layer increase. At the highest resolution, quadrant analysis shows that the majority of events in the lower boundary layer are associated with cold descending air, followed by warm ascending air. The largest contribution to the total heat flux is made by warm ascending air, with associated strong thermals. At lower resolutions, the contribution to the heat flux from cold descending air is increased, and that from cold ascending air is reduced in the lower boundary layer; around the inversion layer, however, the contribution from cold ascending air is increased. Calculations of the heating rate show that the differences in cold ascending air are responsible for the warm bias below the boundary layer top in the low resolution simulations. Correlation length and time scales for coherent resolved structures increase with increasing grid coarseness. The results overall suggest that differences in the simulations are due to weaker mixing between thermals and their environment at lower resolutions. Some simple numerical experiments are performed to increase the mixing in the lower resolution simulations and to investigate backscatter. Such simulations are successful at reducing the contribution of cold ascending air to the heat flux just below the inversion, although the effects in the lower boundary layer are weaker.

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