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Title: On the Need to Modify the Sea Surface Roughness Formulation over Shallow Waters

Abstract

The wind stress formulation in an atmospheric model over shallow waters is investigated using year-long observations of the wind profile within the first 100 m of the atmosphere and mesoscale simulations. The model experiments use a range of planetary boundary layer parameterizations to quantify the uncertainty related to the turbulent closure assumptions and thus to isolate the dominant influence of the surface roughness formulation. Results indicate that a positive wind speed bias exists when common open-ocean formulations for roughness are adopted for a region with a water depth of 30 m. Imposition of a wind stress formulation that is consistent with previous shallow-water estimates is necessary to reconcile model wind speeds with observations, providing modeling evidence that supports the increase of surface drag over shallow waters. Finally, the possibility of including water depth in the parameterization of roughness length is examined.

Authors:
 [1];  [2]
  1. Research Applications Laboratory, National Center for Atmospheric Research, Boulder, Colorado
  2. Mesoscale and Microscale Meteorology Laboratory, National Center for Atmospheric Research, Boulder, Colorado
Publication Date:
Research Org.:
Univ. Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1580184
Alternate Identifier(s):
OSTI ID: 1541813
Grant/Contract Number:  
[EE0005373]
Resource Type:
Published Article
Journal Name:
Journal of Applied Meteorology and Climatology
Additional Journal Information:
[Journal Name: Journal of Applied Meteorology and Climatology Journal Volume: 57 Journal Issue: 5]; Journal ID: ISSN 1558-8424
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; meteorology & atmospheric sciences; wind; mesoscale models; model evaluation/performance; parameterization

Citation Formats

Jiménez, Pedro A., and Dudhia, Jimy. On the Need to Modify the Sea Surface Roughness Formulation over Shallow Waters. United States: N. p., 2018. Web. doi:10.1175/JAMC-D-17-0137.1.
Jiménez, Pedro A., & Dudhia, Jimy. On the Need to Modify the Sea Surface Roughness Formulation over Shallow Waters. United States. doi:10.1175/JAMC-D-17-0137.1.
Jiménez, Pedro A., and Dudhia, Jimy. Tue . "On the Need to Modify the Sea Surface Roughness Formulation over Shallow Waters". United States. doi:10.1175/JAMC-D-17-0137.1.
@article{osti_1580184,
title = {On the Need to Modify the Sea Surface Roughness Formulation over Shallow Waters},
author = {Jiménez, Pedro A. and Dudhia, Jimy},
abstractNote = {The wind stress formulation in an atmospheric model over shallow waters is investigated using year-long observations of the wind profile within the first 100 m of the atmosphere and mesoscale simulations. The model experiments use a range of planetary boundary layer parameterizations to quantify the uncertainty related to the turbulent closure assumptions and thus to isolate the dominant influence of the surface roughness formulation. Results indicate that a positive wind speed bias exists when common open-ocean formulations for roughness are adopted for a region with a water depth of 30 m. Imposition of a wind stress formulation that is consistent with previous shallow-water estimates is necessary to reconcile model wind speeds with observations, providing modeling evidence that supports the increase of surface drag over shallow waters. Finally, the possibility of including water depth in the parameterization of roughness length is examined.},
doi = {10.1175/JAMC-D-17-0137.1},
journal = {Journal of Applied Meteorology and Climatology},
number = [5],
volume = [57],
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1175/JAMC-D-17-0137.1

Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1 FIG. 1: The three domains of 27-, 9-, and 3-km horizontal resolution and the location of FINO1 (star). The vertical distribution of the levels closer to the surface is also shown (inset).

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.