Evaporation of stratiform precipitation and its temperature response in idealized WRF simulations

Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinen


Atmospheric deep convection produces most of the precipitation on Earth and is the main mechanism for precipitation in the tropics. Moreover, convection in the tropics can a↵ect large-scale weather patterns in Europe (Harnik et al. 2014) and a link exists between weather conditions over Europe simulated by the Integrated Forecast System and the representation of convection in the tropics (Vitart and Molteni, 2010).

Deep convection often occurs as single cells on horizontal scale of less than 10 km, but the anvils of individual deep convective cells frequently merge and form large mesoscale convective systems (MCS) with areas sometimes exceeding 40 000 km2 (Mohr and Zipser, 1996). In addition to MCSs producing intense deep convective precipitation, stratiform precipitation from the anvils of deep convection contributes to roughly 30-50 percent of the total rain amount associated with MCSs (see e.g. Tokay and Short, 1996, and references therein).

Humidity just above the boundary layer is known to control atmospheric deep convection, especially in the tropics (e.g. Bretherton et al. 2004; Sobel et al. 2004). Entrainment of environmental air into the cloudy updrafts is often suggested as the reason for this sensitivity (Holloway and Neelin, 2009; Schiro et al. 2016). However, Virman et al. (2018) propose a new mechanism to explain why moist air just above the boundary layer favours deep convection. Based on an analysis of radiosonde observations over tropical oceans, they suggest that evaporation of stratiform precipitation associated with MCSs can produce warm anomalies just above the boundary layer, thus inhibiting subsequent deep convection.

Modeling studies are needed as then it is possible to isolate the e↵ects of evaporation of stratiform precipitation among the many other physical processes occurring with MCSs. As a first step to quantify how evaporation of stratiform precipitation a↵ects the vertical profile of temperature, we have conducted high resolution simulations of stratiform precipitation.
OtsikkoProceedings of ‘The Centre of Excellence in Atmospheric Science (CoE ATM) : 'From Molecular and Biological processes to The Global Climate’, Annual Meeting 2018
ToimittajatPäivi Haapanala, Anna Lintunen, Joonas Enroth, Markku Kulmala
KustantajaAerosolitutkimusseura ry – Finnish Association for Aerosol Research FAAR
ISBN (painettu)978-952-7276-11-2
TilaJulkaistu - 2018
OKM-julkaisutyyppiB3 Vertaisarvioimaton artikkeli konferenssijulkaisussa
TapahtumaThe Centre of Excellence in Atmospheric Science (CoE ATM) – From Molecular and Biological processes to The Global Climate’ Annual Meeting - Kuopio, Kuopio, Suomi
Kesto: 27 marraskuuta 201829 marraskuuta 2018


NimiReport Series in Aerosol Science
KustantajaAerosolitutkimusseura ry
ISSN (painettu)0784-3496


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