Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective
Publisher's version (útgefin grein) The dynamical context and moisture transport pathways embedded in large-scale flow and associated with a heavy precipitation event (HPE) in southern Italy (SI) are investigated with the help of stable water isotopes (SWIs) based on a purely numerical framewor...
Published in: | Atmospheric Chemistry and Physics |
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Online Access: | https://hdl.handle.net/20.500.11815/1695 https://doi.org/10.5194/acp-19-7487-2019 |
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ftopinvisindi:oai:opinvisindi.is:20.500.11815/1695 2023-05-15T17:36:34+02:00 Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective Lee, Keun-Ok Aemisegger, Franziska Pfahl, Stephan Flamant, Cyrille Lacour, Jean-Lionel Chaboureau, Jean-Pierre Jarðvísindastofnun (HÍ) Institute of Earth Sciences (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland 2019-06-05 7487-7506 https://hdl.handle.net/20.500.11815/1695 https://doi.org/10.5194/acp-19-7487-2019 en eng Copernicus GmbH Atmospheric Chemistry and Physics;19(11) https://www.atmos-chem-phys.net/19/7487/2019/acp-19-7487-2019.pdf Lee, K.-O., Aemisegger, F., Pfahl, S., Flamant, C., Lacour, J.-L., and Chaboureau, J.-P.: Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective, Atmos. Chem. Phys., 19, 7487–7506, https://doi.org/10.5194/acp-19-7487-2019, 2019. 1680-7324 https://hdl.handle.net/20.500.11815/1695 Atmospheric Chemistry and Physics doi:10.5194/acp-19-7487-2019 info:eu-repo/semantics/openAccess Hafsvæði Samsætur Flóð info:eu-repo/semantics/article 2019 ftopinvisindi https://doi.org/20.500.11815/1695 https://doi.org/10.5194/acp-19-7487-2019 2022-11-18T06:51:54Z Publisher's version (útgefin grein) The dynamical context and moisture transport pathways embedded in large-scale flow and associated with a heavy precipitation event (HPE) in southern Italy (SI) are investigated with the help of stable water isotopes (SWIs) based on a purely numerical framework. The event occurred during the Intensive Observation Period (IOP) 13 of the field campaign of the Hydrological Cycle in the Mediterranean Experiment (HyMeX) on 15 and 16 October 2012, and SI experienced intense rainfall of 62.4 mm over 27 h with two precipitation phases during this event. The first one (P1) was induced by convective precipitation ahead of a cold front, while the second one (P2) was mainly associated with precipitation induced by large-scale uplift. The moisture transport and processes responsible for the HPE are analysed using a simulation with the isotope-enabled regional numerical model COSMOiso. The simulation at a horizontal grid spacing of about 7 km over a large domain (about 4300 km × 3500 km) allows the isotopes signal to be distinguished due to local processes or large-scale advection. Backward trajectory analyses based on this simulation show that the air parcels arriving in SI during P1 originate from the North Atlantic and descend within an upper-level trough over the north-western Mediterranean. The descending air parcels reach elevations below 1 km over the sea and bring dry and isotopically depleted air (median d18O =-25 ‰, water vapour mixing ratio q = 2 g kg-1) close to the surface, which induces strong surface evaporation. These air parcels are rapidly enriched in SWIs (d18O =-14 ‰) and moistened (q = 8 g kg-1) over the Tyrrhenian Sea by taking up moisture from surface evaporation and potentially from evaporation of frontal precipitation. Thereafter, the SWI-enriched low-level air masses arriving upstream of SI are convectively pumped to higher altitudes, and the SWI-depleted moisture from higher levels is transported towards the surface within the downdrafts ahead of the cold front ... Article in Journal/Newspaper North Atlantic Opin vísindi (Iceland) Atmospheric Chemistry and Physics 19 11 7487 7506 |
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ftopinvisindi |
language |
English |
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Hafsvæði Samsætur Flóð |
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Hafsvæði Samsætur Flóð Lee, Keun-Ok Aemisegger, Franziska Pfahl, Stephan Flamant, Cyrille Lacour, Jean-Lionel Chaboureau, Jean-Pierre Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective |
topic_facet |
Hafsvæði Samsætur Flóð |
description |
Publisher's version (útgefin grein) The dynamical context and moisture transport pathways embedded in large-scale flow and associated with a heavy precipitation event (HPE) in southern Italy (SI) are investigated with the help of stable water isotopes (SWIs) based on a purely numerical framework. The event occurred during the Intensive Observation Period (IOP) 13 of the field campaign of the Hydrological Cycle in the Mediterranean Experiment (HyMeX) on 15 and 16 October 2012, and SI experienced intense rainfall of 62.4 mm over 27 h with two precipitation phases during this event. The first one (P1) was induced by convective precipitation ahead of a cold front, while the second one (P2) was mainly associated with precipitation induced by large-scale uplift. The moisture transport and processes responsible for the HPE are analysed using a simulation with the isotope-enabled regional numerical model COSMOiso. The simulation at a horizontal grid spacing of about 7 km over a large domain (about 4300 km × 3500 km) allows the isotopes signal to be distinguished due to local processes or large-scale advection. Backward trajectory analyses based on this simulation show that the air parcels arriving in SI during P1 originate from the North Atlantic and descend within an upper-level trough over the north-western Mediterranean. The descending air parcels reach elevations below 1 km over the sea and bring dry and isotopically depleted air (median d18O =-25 ‰, water vapour mixing ratio q = 2 g kg-1) close to the surface, which induces strong surface evaporation. These air parcels are rapidly enriched in SWIs (d18O =-14 ‰) and moistened (q = 8 g kg-1) over the Tyrrhenian Sea by taking up moisture from surface evaporation and potentially from evaporation of frontal precipitation. Thereafter, the SWI-enriched low-level air masses arriving upstream of SI are convectively pumped to higher altitudes, and the SWI-depleted moisture from higher levels is transported towards the surface within the downdrafts ahead of the cold front ... |
author2 |
Jarðvísindastofnun (HÍ) Institute of Earth Sciences (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland |
format |
Article in Journal/Newspaper |
author |
Lee, Keun-Ok Aemisegger, Franziska Pfahl, Stephan Flamant, Cyrille Lacour, Jean-Lionel Chaboureau, Jean-Pierre |
author_facet |
Lee, Keun-Ok Aemisegger, Franziska Pfahl, Stephan Flamant, Cyrille Lacour, Jean-Lionel Chaboureau, Jean-Pierre |
author_sort |
Lee, Keun-Ok |
title |
Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective |
title_short |
Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective |
title_full |
Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective |
title_fullStr |
Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective |
title_full_unstemmed |
Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective |
title_sort |
contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern italy during hymex iop 13: a modelling perspective |
publisher |
Copernicus GmbH |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11815/1695 https://doi.org/10.5194/acp-19-7487-2019 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Atmospheric Chemistry and Physics;19(11) https://www.atmos-chem-phys.net/19/7487/2019/acp-19-7487-2019.pdf Lee, K.-O., Aemisegger, F., Pfahl, S., Flamant, C., Lacour, J.-L., and Chaboureau, J.-P.: Contrasting stable water isotope signals from convective and large-scale precipitation phases of a heavy precipitation event in southern Italy during HyMeX IOP 13: a modelling perspective, Atmos. Chem. Phys., 19, 7487–7506, https://doi.org/10.5194/acp-19-7487-2019, 2019. 1680-7324 https://hdl.handle.net/20.500.11815/1695 Atmospheric Chemistry and Physics doi:10.5194/acp-19-7487-2019 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/20.500.11815/1695 https://doi.org/10.5194/acp-19-7487-2019 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
19 |
container_issue |
11 |
container_start_page |
7487 |
op_container_end_page |
7506 |
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1766136088609423360 |