Identification

Title

Estimation of the equivalent Rayleigh friction in mesosphere/lower thermosphere region from the migrating diurnal tides observed by TIMED

Abstract

We use Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED) global temperature and wind data from 2002 to 2007 to investigate the damping of the diurnal tide. Horizontal winds are measured by TIDI and are calculated from SABER temperature measurements. The determination of tidal winds from SABER temperature depends on the damping and, therefore, the discrepancy between TIDI and SABER determinations of the wind tides can be used to calculate the tidal damping. This damping is approximated here by an equivalent Rayleigh friction (ERF), and it is adjusted to minimize the difference in winds derived from SABER and TIDI data. The results show that during some periods the ERF coefficient can be very large over narrow vertical regions of about 5 km (∼10−5 s−1 in low latitudes and about 10−4 s−1 in midlatitudes). The magnitude and shape of the vertical profiles change with latitude and season. The peak in the vertical profile of ERF is larger and located at a higher altitude in summer than in winter and the ERF coefficients at 40° are stronger than at 20° in both hemispheres. The ERF deduced in this study, without a priori assumption about the mechanism of the damping, shows a seasonal variation that is clearly consistent with the seasonal variation of the zonal mean wind; the maximum ERF generally coincides with the altitudes of strongest wind reversal in the mesopause region.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7d21zmk

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

2009-12-04T00:00:00Z

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

Copyright 2010 American Geophysical Union.

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

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 date

2023-08-18T18:56:57.818248

Metadata language

eng; USA