Identification

Title

Clear-sky column water vapor retrievals using the Airborne Imaging Microwave Radiometer (AIMR)

Abstract

The brightness temperature measurements from the Airborne Imaging Microwave Radiometer ( AIMR) microwave radiometer 37 GHz and 90 GHz channels are used to determine the column water vapor amount under clear-sky conditions during the Indian Ocean Experiment ( INDOEX) campaign in 1999. The retrieval algorithm is based on the integrated relative humidity profiles measured by numerous dropsondes released from the National Center for Atmospheric Research ( NCAR) C-130 aircraft that operated during the 2 month Intensive Field Phase ( IFP) of INDOEX. The highest correlations of the linear relationship between the AIMR brightness temperature measurements and the dropsonde column water vapor values are for the nadir brightness temperatures of the 37 GHz and 90 GHz AIMR channels. The column water vapor, w, given with units of kg m(-2), may be expressed in terms of the 90 GHz nadir brightness temperature, T-B, via the expression, w = -209.4 + 1.025 T-B, whereas in terms of the 37 GHz AIMR nadir brightness temperature, w = -277.8 + 1.835 T-B. These expressions are valid when AIMR brightness temperature measurements about the NCAR C-130 are made at high altitudes ( above 5 km) and when the atmospheric column is cloud-free below the aircraft. Other relationships between the polarized components of the AIMR brightness temperature measurements as well as various combinations ( differences) of these polarized components with the column water vapor did not identify any parameterizations to the algorithm better than that seen with the mean of the raw brightness temperature components.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7319wjr

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

2007-10-30T00:00:00Z

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