COnstraining ORographic Drag Effects (COORDE): A Model Comparison of Resolved and Parametrized Orographic Drag

Niekerk, Annelize; Sandu, Irina; Zadra, Ayrton; Bazile, Eric; Kanehama, Takafumi; Köhler, Martin; Koo, Myung‐Seo; Choi, Hyun‐Joo; Kuroki, Yukihiro; Toy, Michael D.; Vosper, Simon B.; Yudin, Valery

doi:10.1029/2020MS002160

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COnstraining ORographic Drag Effects (COORDE): A Model Comparison of Resolved and Parametrized Orographic Drag

2020
By Niekerk, Annelize ; Sandu, Irina ; Zadra, Ayrton ; ...
Source: Journal of Advances in Modeling Earth Systems, 12(11)

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Journal Title:

Journal of Advances in Modeling Earth Systems
Personal Author:

Niekerk, Annelize ; Sandu, Irina ; Zadra, Ayrton ; Bazile, Eric ; Kanehama, Takafumi ; ... More +

Niekerk, Annelize ; Sandu, Irina ; Zadra, Ayrton ; Bazile, Eric ; Kanehama, Takafumi ; Köhler, Martin ; Koo, Myung‐Seo ; Choi, Hyun‐Joo ; Kuroki, Yukihiro ; Toy, Michael D. ; Vosper, Simon B. ; Yudin, Valery Less -
NOAA Program & Office:

CIRES (Cooperative Institute for Research in Environmental Sciences) ; NWS (National Weather Service)

CIRES (Cooperative Institute for Research in Environmental Sciences) ; NWS (National Weather Service) Less -
Description:

The parametrization of orographic drag processes is a major source of circulation uncertainty in models. The COnstraining ORographic Drag Effects (COORDE) project makes a coordinated effort to narrow this uncertainty by bringing together the modeling community to: explore the variety of orographic drag parametrizations employed in current operational models; assess the resolution sensitivity of resolved and parametrized orographic drag across models; and to validate the parametrized orographic drag in low-resolution simulations using explicitly resolved orographic drag from high-resolution simulations. Eleven models from eight major modeling centers are used to estimate resolved orographic drag from high-resolution (km-scale) simulations and parametrized orographic drag from low-resolution simulations, typically used for seasonal forecasting (∼40 km) and climate projections (∼100 km). In most models, at both seasonal and climate resolutions, the total (resolved plus parametrized) orographic gravity wave drag over land is shown to be underestimated by a considerable amount (up to 50%) over the Northern and Southern Hemisphere and by more than 60% over the Middle East region, with respect to the resolved gravity wave drag estimated from km-scale simulations. The km-scale simulations also provide evidence that the parametrized surface stress and the parametrized low-level orographic drag throughout the troposphere are overestimated in most models over the Middle East region, particularly at climate resolutions. Through this process-based evaluation, COORDE provides model developers new valuable information on the current representation of orographic drag at seasonal and climate resolutions and the vertical partitioning of orographic low-level and gravity wave drag.
Keywords:

[+]

Orographic drag; Gravity wave drag; Numerical weather prediction; Boundary layer meteorology; Stratospheric dynamics; Atmospheric modelling
Source:

Journal of Advances in Modeling Earth Systems, 12(11)
DOI:

https://doi.org/10.1029/2020MS002160
Document Type:

Journal Article
Funding:

Grant no. NA18NWS4680050
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CC BY
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Submitted
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urn:sha256:92b2c770314fde4ed0be2685de9cfb5d2ab8cb463c27a08ed031a5d75fe534f8
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https://repository.library.noaa.gov/view/noaa/31970/noaa_31970_DS1.pdf
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COnstraining ORographic Drag Effects (COORDE): A Model Comparison of Resolved and Parametrized Orographic Drag

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