Identification

Title

Day‐to‐day variability of diurnal tide in the mesosphere and lower thermosphere driven from below

Abstract

The migrating diurnal tide (DW1) is one of the dominant wave motions in the mesosphere and lower thermosphere. It plays a crucial role in neutral atmosphere and ionosphere coupling. The DW1 can vary over a range of time scales from days to years. While the long-term variability of the DW1 is mainly attributed to the source and background atmosphere variability, the driving mechanism of short-term DW1 variability is still openly debated. Herein the daily structure of the DW1 is extracted from observations using a novel multi-satellite estimation technique and compared with model simulations (NOGAPS-ALPHA and WACCM-X). Both the observations and the models show that the day-to-day variability of the DW1 is a persistent and ubiquitous feature. The standard deviation peak of DW1 amplitudes, which is used to measure the maximum variability, is generally aligned with the DW1 amplitude peak. This result indicates that the day-to-day variability of the DW1 reflects global-scale changes rather than local excitation of diurnal oscillation. The spatial lag-correlation analysis of the diurnal (1,1) and (1,2) Hough modes suggests that the day-to-day variability of the diurnal (1,1) Hough mode is likely driven by variability in the lower atmosphere and the source of day-to-day variability of the (1,2) mode is uncertain. The significant correlation of the DW1 day-to-day variability between the NOGAPS-ALPHA and the multi-satellite estimation techniques also indicates that the model is capable of reproducing the DW1 structure on a daily basis.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7hq438c

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

2021-02-01T00:00:00Z

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