A survey of precipitation-induced atmospheric cold pools over oceans and their interactions with the larger-scale environment

Zuidema P, Torri G, MULLER CJ, Chandra A. 2017. A survey of precipitation-induced atmospheric cold pools over oceans and their interactions with the larger-scale environment. Surveys in Geophysics. 38(6), 1283–1305.


Journal Article | Published | English
Author
Zuidema, Paquita; Torri, Giuseppe; MULLER, Caroline JIST Austria; Chandra, Arunchandra
Abstract
Pools of air cooled by partial rain evaporation span up to several hundreds of kilometers in nature and typically last less than 1 day, ultimately losing their identity to the large-scale flow. These fundamentally differ in character from the radiatively-driven dry pools defining convective aggregation. Advancement in remote sensing and in computer capabilities has promoted exploration of how precipitation-induced cold pool processes modify the convective spectrum and life cycle. This contribution surveys current understanding of such cold pools over the tropical and subtropical oceans. In shallow convection with low rain rates, the cold pools moisten, preserving the near-surface equivalent potential temperature or increasing it if the surface moisture fluxes cannot ventilate beyond the new surface layer; both conditions indicate downdraft origin air from within the boundary layer. When rain rates exceed ∼ 2 mm h−1, convective-scale downdrafts can bring down drier air of lower equivalent potential temperature from above the boundary layer. The resulting density currents facilitate the lifting of locally thermodynamically favorable air and can impose an arc-shaped mesoscale cloud organization. This organization allows clouds capable of reaching 4–5 km within otherwise dry environments. These are more commonly observed in the northern hemisphere trade wind regime, where the flow to the intertropical convergence zone is unimpeded by the equator. Their near-surface air properties share much with those shown from cold pools sampled in the equatorial Indian Ocean. Cold pools are most effective at influencing the mesoscale organization when the atmosphere is moist in the lower free troposphere and dry above, suggesting an optimal range of water vapor paths. Outstanding questions on the relationship between cold pools, their accompanying moisture distribution and cloud cover are detailed further. Near-surface water vapor rings are documented in one model inside but near the cold pool edge; these are not consistent with observations, but do improve with smaller horizontal grid spacings.
Publishing Year
Date Published
2017-11-14
Journal Title
Surveys in Geophysics
Volume
38
Issue
6
Page
1283-1305
IST-REx-ID

Cite this

Zuidema P, Torri G, MULLER CJ, Chandra A. A survey of precipitation-induced atmospheric cold pools over oceans and their interactions with the larger-scale environment. Surveys in Geophysics. 2017;38(6):1283-1305. doi:10.1007/s10712-017-9447-x
Zuidema, P., Torri, G., MULLER, C. J., & Chandra, A. (2017). A survey of precipitation-induced atmospheric cold pools over oceans and their interactions with the larger-scale environment. Surveys in Geophysics. Springer Nature. https://doi.org/10.1007/s10712-017-9447-x
Zuidema, Paquita, Giuseppe Torri, Caroline J MULLER, and Arunchandra Chandra. “A Survey of Precipitation-Induced Atmospheric Cold Pools over Oceans and Their Interactions with the Larger-Scale Environment.” Surveys in Geophysics. Springer Nature, 2017. https://doi.org/10.1007/s10712-017-9447-x.
P. Zuidema, G. Torri, C. J. MULLER, and A. Chandra, “A survey of precipitation-induced atmospheric cold pools over oceans and their interactions with the larger-scale environment,” Surveys in Geophysics, vol. 38, no. 6. Springer Nature, pp. 1283–1305, 2017.
Zuidema P, Torri G, MULLER CJ, Chandra A. 2017. A survey of precipitation-induced atmospheric cold pools over oceans and their interactions with the larger-scale environment. Surveys in Geophysics. 38(6), 1283–1305.
Zuidema, Paquita, et al. “A Survey of Precipitation-Induced Atmospheric Cold Pools over Oceans and Their Interactions with the Larger-Scale Environment.” Surveys in Geophysics, vol. 38, no. 6, Springer Nature, 2017, pp. 1283–305, doi:10.1007/s10712-017-9447-x.
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