2018
DOI: 10.5194/acp-18-1997-2018
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Tropical continental downdraft characteristics: mesoscale systems versus unorganized convection

Abstract: Abstract. Downdrafts and cold pool characteristics for strong mesoscale convective systems (MCSs) and isolated, unorganized deep precipitating convection are analyzed using multi-instrument data from the DOE Atmospheric Radiation Measurement (ARM) GoAmazon2014/5 campaign. Increases in column water vapor (CWV) are observed leading convection, with higher CWV preceding MCSs than for isolated cells. For both MCSs and isolated cells, increases in wind speed, decreases in surface moisture and temperature, and incre… Show more

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Cited by 32 publications
(48 citation statements)
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“…In total, 45 MCS events were identified for this deployment, with 24 “Wet” season (December through April), 10 “Dry” season (June through September), and 11 “Transitional” season (March, October, and November) examples (Table S1 in the supporting information). Amazon events also satisfy MCS criteria outlined in the complementary work by Schiro and Neelin (). These criteria include that MCS events have a surface equivalent potential temperature ( θ e ) drop greater than 5 K within 30 min of line passage and a maximum precipitation rate exceeding 10 mm/hr within the convective line.…”
Section: Methodsmentioning
confidence: 99%
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“…In total, 45 MCS events were identified for this deployment, with 24 “Wet” season (December through April), 10 “Dry” season (June through September), and 11 “Transitional” season (March, October, and November) examples (Table S1 in the supporting information). Amazon events also satisfy MCS criteria outlined in the complementary work by Schiro and Neelin (). These criteria include that MCS events have a surface equivalent potential temperature ( θ e ) drop greater than 5 K within 30 min of line passage and a maximum precipitation rate exceeding 10 mm/hr within the convective line.…”
Section: Methodsmentioning
confidence: 99%
“…These criteria include that MCS events have a surface equivalent potential temperature ( θ e ) drop greater than 5 K within 30 min of line passage and a maximum precipitation rate exceeding 10 mm/hr within the convective line. The representativeness of thermodynamic profiles has been modified from the requirements used by Schiro and Neelin () to selecting events having radiosonde launches in advance of the convective line/cold pool that are launched less than 4 hr prior to line passage over the RWP.…”
Section: Methodsmentioning
confidence: 99%
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“…The downward transport of particles from the lower free troposphere to the BL can occur either through convective downdrafts , typically observed in Amazonia (Machado et al, 2004;Nunes et al, 2016), or through continuous entrainment. Previous studies reported heights of 1500 to 2500 km as the probable level of the origin of convective downdraft events in Amazonia (Betts et al, 2002;Schiro and Neelin, 2018). In this way, convective downdrafts could explain the transport of particles from the lower free troposphere into the BL; however the downward transport of particles from outflow regions of deep convective clouds is still uncertain, and requires more investigation.…”
Section: Introductionmentioning
confidence: 96%
“…The program collected diverse data during 2014-2015 on the distributions of pollutants, surface fluxes, and surface and upper-air meteorological conditions (detailed information can be found in Martin et al, 2016). The data availability motivated several studies Cecchini et al, 2016;Collow et al, 2016;Kuo et al, 2017;Marengo et al, 2017;Cecchini et al, 2017;Schiro and Neelin, 2018;Wang et al, 2018;Chakraborty et al, 2018; among many others). In particular, Schiro and Neelin (2018) found that the downdrafts associated with MCSs and isolated F I G U R E 1 (a) Amazon basin (green area) and GoAmazon2014/5 region (black box) locations; and (b) GoAmazon2014/5 sites locations (white circles; see also convection had similar magnitudes and probabilities with height.…”
Section: Introductionmentioning
confidence: 99%