Identification

Title

The tropical marine boundary layer under a deep convection system: A large-eddy simulation study

Abstract

The tropical marine PBL under the influence of a deep convection system is investigated using a largedomain LES that resolves a wide range of scales, from mesoscale cloud clusters down to energy-containing turbulence. The simulated PBL is dominated by both turbulence and cloud-induced cold-pools. The variance of vertical velocity in the PBL resides mostly in the turbulence scales while that of water vapor mixing ratio resides mostly at the cold-pool scales; however, both turbulence and cold-pool scales contribute about equally to their covariance. The broad scale range of the LES flow field is decomposed into the filtered (i.e., cloud system) and the subfilter (i.e., small convection and turbulence) components using a Gaussian filter with various filter widths. Such decomposed flow fields are used to retrieve information of spatial distribution of the subfilter-scale fluxes and their relationship to the filtered field. This information is then used to evaluate the performance of an eddy-viscosity model commonly used in cloud-resolving models. The subfilter-scale fluxes computed from the eddy-viscosity model correlate reasonably with those retrieved from the LES in the lower cloud layer but not in the PBL; the correlation coefficients between the modeled and the retrieved fluxes are about 0.5 in the lower cloud layer but smaller than 0.2 in the PBL.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7319x57

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2009-12-01T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact