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2013 ; 118
(10
): 4385-4400
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The role of deep convection and nocturnal low-level jets for dust emission in
summertime West Africa: Estimates from convection-permitting simulations
#MMPMID25893153
Heinold B
; Knippertz P
; Marsham JH
; Fiedler S
; Dixon NS
; Schepanski K
; Laurent B
; Tegen I
J Geophys Res Atmos
2013[May]; 118
(10
): 4385-4400
PMID25893153
show ga
[1] Convective cold pools and the breakdown of nocturnal low-level jets (NLLJs)
are key meteorological drivers of dust emission over summertime West Africa, the
world's largest dust source. This study is the first to quantify their relative
contributions and physical interrelations using objective detection algorithms
and an off-line dust emission model applied to convection-permitting simulations
from the Met Office Unified Model. The study period covers 25 July to 02
September 2006. All estimates may therefore vary on an interannual basis. The
main conclusions are as follows: (a) approximately 40% of the dust emissions are
from NLLJs, 40% from cold pools, and 20% from unidentified processes (dry
convection, land-sea and mountain circulations); (b) more than half of the
cold-pool emissions are linked to a newly identified mechanism where aged cold
pools form a jet above the nocturnal stable layer; (c) 50% of the dust emissions
occur from 1500 to 0200 LT with a minimum around sunrise and after midday, and
60% of the morning-to-noon emissions occur under clear skies, but only 10% of the
afternoon-to-nighttime emissions, suggesting large biases in satellite
retrievals; (d) considering precipitation and soil moisture effects, cold-pool
emissions are reduced by 15%; and (e) models with parameterized convection show
substantially less cold-pool emissions but have larger NLLJ contributions. The
results are much more sensitive to whether convection is parameterized or
explicit than to the choice of the land-surface characterization, which generally
is a large source of uncertainty. This study demonstrates the need of
realistically representing moist convection and stable nighttime conditions for
dust modeling. Citation: Heinold, B., P. Knippertz, J. H. Marsham, S. Fiedler, N.
S. Dixon, K. Schepanski, B. Laurent, and I. Tegen (2013), The role of deep
convection and nocturnal low-level jets for dust emission in summertime West
Africa: Estimates from convection-permitting simulations, J. Geophys. Res.
Atmos., 118, 4385-4400, doi:10.1002/jgrd.50402.