Modeling the atmospheric life cycle and radiative impact of mineral dust in the Hadley Centre climate model

被引:231
作者
Woodward, S [1 ]
机构
[1] Hadley Ctr Climate Predict & Res, Meteorol Off, Bracknell RG12 2SY, Berks, England
关键词
D O I
10.1029/2000JD900795
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
A parameterization of mineral dust within the Hadley Centre atmospheric general circulation model (AGCM) is described, modeled dust distributions are compared with observations, and estimates of the radiative forcing due to the inclusion of dust in the model are obtained. The parameterization uses six particle size divisions in the range 0.3-30 mum radius, and all calculations are performed on each division independently, using the GCM's prognostic variables. The dust production scheme works within the GCM and includes dependencies on particle size distribution, soil moisture, vegetation, and friction velocity. Dust transport is carried out by the GCM's tracer advection scheme and includes vertical motion due to convection, gravitational settling, and turbulent mixing in the boundary layer. Wet and dry deposition processes are included within the GCM's precipitation schemes. Representative dust radiative parameters are incorporated into the GCM's two stream radiation code. Modeled monthly average near-surface dust concentrations are compared with observations: good agreement is seen in most locations, though the dust scheme tends to produce too little dust from China and too much from Australia in the southern spring. Global annual mean direct forcing due to the inclusion of dust in the GCM is +0.07 W m(-2) at the top of the atmosphere (TOA) and -0.82 W m(-2) at the surface. The geographical distributions of annual mean forcings are very inhomogeneous, with peak values exceeding the global means by a factor of approximately 2 orders of magnitude.
引用
收藏
页码:18155 / 18166
页数:12
相关论文
共 53 条
[21]  
GREGORY D, 1990, MON WEATHER REV, V118, P1483, DOI 10.1175/1520-0493(1990)118<1483:AMFCSW>2.0.CO
[22]  
2
[23]  
GREGORY D, 1991, 9 C NUM WEATH PRED
[24]  
HOTTA S, 1984, 19 COAST ENG C COAST
[25]  
JOSEPH JH, 1977, P S RAD ATM
[27]   Variations in the size distribution of non-sea-salt sulfate aerosol in the marine boundary layer at Barbados: Impact of African dust [J].
Li-Jones, X ;
Prospero, JM .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1998, 103 (D13) :16073-16084
[28]   Prediction of the number of cloud droplets in the ECHAM GCM [J].
Lohmann, U ;
Feichter, J ;
Chuang, CC ;
Penner, JE .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1999, 104 (D8) :9169-9198
[29]   The IGBP-DIS global 1 km land cover data set, DISCover: first results [J].
Loveland, TR ;
Belward, AS .
INTERNATIONAL JOURNAL OF REMOTE SENSING, 1997, 18 (15) :3291-3295
[30]   Dust sources and deposition during the last glacial maximum and current climate: A comparison of model results with paleodata from ice cores and marine sediments [J].
Mahowald, N ;
Kohfeld, K ;
Hansson, M ;
Balkanski, Y ;
Harrison, SP ;
Prentice, IC ;
Schulz, M ;
Rodhe, H .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1999, 104 (D13) :15895-15916