The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners.
As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.
i
New modified and extended stability functions for the stable boundary layer based on SHEBA and parametrizations of bulk transfer coefficients for climate models
-
2020
-
-
Source: Journal of the Atmospheric Sciences, 77(8), 2687-2716.
Details:
-
Journal Title:Journal of the Atmospheric Sciences
-
Personal Author:
-
NOAA Program & Office:
-
Description:Climate models still have deficits in reproducing the surface energy and momentum budgets in Arctic regions. One of the reasons is that currently used transfer coefficients occurring in parametrizations of the turbulent fluxes are based on stability functions derived from measurements over land and not over sea ice. An improved parametrization is developed using the Monin Obukhov Similarity Theory (MOST) and corresponding stability functions that reproduce measurements over sea ice obtained during the Surface Heat Budget over the Arctic Ocean campaign (SHEBA). The new stability functions for the stable boundary layer represent a modification of earlier ones also based on SHEBA measurements. It is shown that the new functions are superior to the former ones with respect to the representation of the measured relationship between the Obukhov length and the bulk Richardson number. Nevertheless, the functions fulfill the same criteria of applicability as the earlier functions and contain, as an extension, a dependence on the Prandtl number. Applying the new functions we develop an efficient non-iterative parametrization of the near-surface turbulent fluxes of momentum and heat with transfer coefficients as a function of the bulk Richardson number (Rib) and roughness parameters. A hierarchy of transfer coefficients is recommended for weather and climate models. They agree better with SHEBA data for strong stability (Rib > 0.1) than previous parametrizations and they agree well with those based on the Dyer-Businger functions in the range Rib ≤ 0.1.
-
Keywords:
-
Source:Journal of the Atmospheric Sciences, 77(8), 2687-2716.
-
DOI:
-
Document Type:
-
Rights Information:CC BY
-
Compliance:Submitted
-
Main Document Checksum:
-
Download URL:
-
File Type: