دورية أكاديمية
Counter-Gradient Momentum Transport Through Subtropical Shallow Convection in ICON-LEM Simulations.
| العنوان: | Counter-Gradient Momentum Transport Through Subtropical Shallow Convection in ICON-LEM Simulations. |
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| المؤلفون: | Dixit V; Department of Remote Sensing and Geosciences TU Delft Delft the Netherlands., Nuijens L; Department of Remote Sensing and Geosciences TU Delft Delft the Netherlands., Helfer KC; Department of Remote Sensing and Geosciences TU Delft Delft the Netherlands. |
| المصدر: | Journal of advances in modeling earth systems [J Adv Model Earth Syst] 2021 Jun; Vol. 13 (6), pp. e2020MS002352. Date of Electronic Publication: 2021 Jun 04. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Wiley-Blackwell Country of Publication: United States NLM ID: 101691496 Publication Model: Print-Electronic Cited Medium: Print ISSN: 1942-2466 (Print) Linking ISSN: 19422466 NLM ISO Abbreviation: J Adv Model Earth Syst Subsets: PubMed not MEDLINE |
| أسماء مطبوعة: | Publication: 2013- : Malden, MA : Wiley-Blackwell Original Publication: Calverton, MD : Institute of Global Environment and Society, 2009- |
| مستخلص: | It is well known that subtropical shallow convection transports heat and water vapor upwards from the surface. It is less clear if it also transports horizontal momentum upwards to significantly affect the trade winds in which it is embedded. We utilize unique multiday large-eddy simulations run over the tropical Atlantic with ICON-LEM to investigate the character of shallow convective momentum transport (CMT). For a typical trade-wind profile during boreal winter, CMT acts as an apparent friction to decelerate the north-easterly flow. This effect maximizes below the cloud base while in the cloud layer, friction is very small, although present over a relatively deep layer. In the cloud layer, the zonal component of the momentum flux is counter-gradient and penetrates deeper than reported in traditional shallow cumulus LES cases. The transport through conditionally sampled convective updrafts and downdrafts explains a weak friction effect, but not the counter-gradient flux near the cloud tops. The analysis of the momentum flux budget reveals that, in the cloud layer, the counter-gradient flux is driven by convectively triggered nonhydrostatic pressure-gradients and horizontal circulations surrounding the clouds. A model set-up with large domain size and realistic boundary conditions is necessary to resolve these effects. (© 2021. The Authors. Journal of Advances in Modeling Earth Systems published by Wiley Periodicals LLC on behalf of American Geophysical Union.) |
| References: | Geophys Res Lett. 2020 Apr 16;47(7):e2019GL085988. (PMID: 32713982) J Adv Model Earth Syst. 2020 Dec;12(12):e2020MS002183. (PMID: 33381277) J Adv Model Earth Syst. 2021 Jun;13(6):e2020MS002352. (PMID: 34221242) |
| فهرسة مساهمة: | Keywords: convective momentum transport; counter‐gradient flux; cumulus friction; large‐eddy simulations; momentum flux budget; shallow cumulus clouds |
| تواريخ الأحداث: | Date Created: 20210705 Latest Revision: 20240402 |
| رمز التحديث: | 20240402 |
| مُعرف محوري في PubMed: | PMC8244060 |
| DOI: | 10.1029/2020MS002352 |
| PMID: | 34221242 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1942-2466 |
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| DOI: | 10.1029/2020MS002352 |