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Foehn-cold pool interactions in the Inn Valley during PIANO IOP2.
Q J R Meteorol Soc. 2020 Apr; 146(728):1232-1263.QJ

Abstract

A case-study is presented of a south foehn emanating from the Wipp Valley, Austria, which encountered a cold-air pool (CAP) in the Inn Valley near the city of Innsbruck. The analysis is based on data collected during the second Intensive Observation Period of the Penetration and Interruption of Alpine Foehn (PIANO) field experiment. Foehn was initiated on 3 November 2017 by an eastward moving trough and terminated in the afternoon of 5 November 2017 by a cold front passage. On two occasions, reversed foehn flow deflected at the mountain ridge north of Innsbruck penetrated to the bottom of the Inn Valley. The first breakthrough occurred in the afternoon of 4 November 2017. It was transient and locally limited to the northwest of the city. The second (final) breakthrough occurred in the morning of 5 November 2017 and was recorded by all surface stations in the vicinity of Innsbruck. It started with a foehn air intrusion to the northeast of Innsbruck and continued with the westward propagation of the foehn-CAP boundary along the valley. Subsequently observed northerly winds above the city were caused by an atmospheric rotor. A few hours later and prior to the cold front passage, the CAP pushed back and lifted the foehn air from the ground. During both nights, shear flow instabilities formed at the foehn-CAP interface, which resulted in turbulent heating of the CAP and cooling of the foehn. However, this turbulent heating/cooling was partly compensated by other mechanisms. Especially in the presence of strong spatial CAP heterogeneity during the second night, heating in the CAP was most likely overcompensated by negative horizontal temperature advection.

Authors+Show Affiliations

Department of Atmospheric and Cryospheric Sciences University of Innsbruck Innsbruck Austria.Department of Atmospheric and Cryospheric Sciences University of Innsbruck Innsbruck Austria.Department of Atmospheric and Cryospheric Sciences University of Innsbruck Innsbruck Austria.Department of Atmospheric and Cryospheric Sciences University of Innsbruck Innsbruck Austria.Department of Atmospheric and Cryospheric Sciences University of Innsbruck Innsbruck Austria.Department of Atmospheric and Cryospheric Sciences University of Innsbruck Innsbruck Austria.Department of Atmospheric and Cryospheric Sciences University of Innsbruck Innsbruck Austria.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32612310

Citation

Haid, M, et al. "Foehn-cold Pool Interactions in the Inn Valley During PIANO IOP2." Quarterly Journal of the Royal Meteorological Society. Royal Meteorological Society (Great Britain), vol. 146, no. 728, 2020, pp. 1232-1263.
Haid M, Gohm A, Umek L, et al. Foehn-cold pool interactions in the Inn Valley during PIANO IOP2. Q J R Meteorol Soc. 2020;146(728):1232-1263.
Haid, M., Gohm, A., Umek, L., Ward, H. C., Muschinski, T., Lehner, L., & Rotach, M. W. (2020). Foehn-cold pool interactions in the Inn Valley during PIANO IOP2. Quarterly Journal of the Royal Meteorological Society. Royal Meteorological Society (Great Britain), 146(728), 1232-1263. https://doi.org/10.1002/qj.3735
Haid M, et al. Foehn-cold Pool Interactions in the Inn Valley During PIANO IOP2. Q J R Meteorol Soc. 2020;146(728):1232-1263. PubMed PMID: 32612310.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Foehn-cold pool interactions in the Inn Valley during PIANO IOP2. AU - Haid,M, AU - Gohm,A, AU - Umek,L, AU - Ward,H C, AU - Muschinski,T, AU - Lehner,L, AU - Rotach,M W, Y1 - 2020/01/29/ PY - 2019/10/01/received PY - 2019/12/20/revised PY - 2019/12/23/accepted PY - 2020/7/3/entrez PY - 2020/7/3/pubmed PY - 2020/7/3/medline KW - cold‐air pool KW - foehn KW - heat budget KW - multiple Doppler wind lidars KW - shear flow instabilties KW - turbulent erosion SP - 1232 EP - 1263 JF - Quarterly journal of the Royal Meteorological Society. Royal Meteorological Society (Great Britain) JO - Q J R Meteorol Soc VL - 146 IS - 728 N2 - A case-study is presented of a south foehn emanating from the Wipp Valley, Austria, which encountered a cold-air pool (CAP) in the Inn Valley near the city of Innsbruck. The analysis is based on data collected during the second Intensive Observation Period of the Penetration and Interruption of Alpine Foehn (PIANO) field experiment. Foehn was initiated on 3 November 2017 by an eastward moving trough and terminated in the afternoon of 5 November 2017 by a cold front passage. On two occasions, reversed foehn flow deflected at the mountain ridge north of Innsbruck penetrated to the bottom of the Inn Valley. The first breakthrough occurred in the afternoon of 4 November 2017. It was transient and locally limited to the northwest of the city. The second (final) breakthrough occurred in the morning of 5 November 2017 and was recorded by all surface stations in the vicinity of Innsbruck. It started with a foehn air intrusion to the northeast of Innsbruck and continued with the westward propagation of the foehn-CAP boundary along the valley. Subsequently observed northerly winds above the city were caused by an atmospheric rotor. A few hours later and prior to the cold front passage, the CAP pushed back and lifted the foehn air from the ground. During both nights, shear flow instabilities formed at the foehn-CAP interface, which resulted in turbulent heating of the CAP and cooling of the foehn. However, this turbulent heating/cooling was partly compensated by other mechanisms. Especially in the presence of strong spatial CAP heterogeneity during the second night, heating in the CAP was most likely overcompensated by negative horizontal temperature advection. SN - 0035-9009 UR - https://www.unboundmedicine.com/medline/citation/32612310/Foehn-cold_pool_interactions_in_the_Inn_Valley_during_PIANO_IOP2 L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32612310/ DB - PRIME DP - Unbound Medicine ER -
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