TY - JOUR
T1 - Possible effects of collisional breakup on mixed-phase deep convection simulated by a spectral (bin) cloud model
AU - Seifert, Axel
AU - Khain, Alexander
AU - Blahak, Ulrich
AU - Beheng, Klaus D.
PY - 2005/6
Y1 - 2005/6
N2 - The effects of the collisional breakup of raindrops are investigated using the Hebrew University Cloud Model (HUCM). The parameterizations, which are combined in the new breakup scheme, are those of Low and List, Beard and Ochs, as well as Brown. A sensitivity study reveals strong effects of collisional breakup on the precipitation formation in mixed-phase deep convective clouds for strong as well as for weak precipitation events. Collisional breakup reduces the number of large raindrops, increases the number of small raindrops, and, as a consequence, decreases surface rain rates and considerably reduces the speed of rain formation. In addition, it was found that including breakup can lead to a more intense triggering of secondary convective cells. But a statistical comparison with observed raindrop size distributions shows that the parameterizations might systematically overestimate collisional breakup.
AB - The effects of the collisional breakup of raindrops are investigated using the Hebrew University Cloud Model (HUCM). The parameterizations, which are combined in the new breakup scheme, are those of Low and List, Beard and Ochs, as well as Brown. A sensitivity study reveals strong effects of collisional breakup on the precipitation formation in mixed-phase deep convective clouds for strong as well as for weak precipitation events. Collisional breakup reduces the number of large raindrops, increases the number of small raindrops, and, as a consequence, decreases surface rain rates and considerably reduces the speed of rain formation. In addition, it was found that including breakup can lead to a more intense triggering of secondary convective cells. But a statistical comparison with observed raindrop size distributions shows that the parameterizations might systematically overestimate collisional breakup.
UR - http://www.scopus.com/inward/record.url?scp=12144262133&partnerID=8YFLogxK
U2 - 10.1175/JAS3432.1
DO - 10.1175/JAS3432.1
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AN - SCOPUS:12144262133
SN - 0022-4928
VL - 62
SP - 1917
EP - 1931
JO - Journal of the Atmospheric Sciences
JF - Journal of the Atmospheric Sciences
IS - 6
ER -