Identification

Title

Gerber scientific (GSI) 1000-hz PVM

Alternative title(s)

87.129

Abstract

This data set includes airborne measurements obtained from the NSF/NCAR C-130 aircraft during the "Rain in Cumulus Over the Ocean" (RICO) project. This data set contains 1000 hertz PVM data. The files are in netCDF format. Two hot-wire liquid water sensors and a PVM-100 laser-based liquid water sensor were mounted on the C-130 for the program. While all systems performed well, accumulation of salt on the hot-wire elements tended to increase the baseline drift in the raw output. RAF employed a loose-couple processing method to remove the excess drift. Both techniques, hot wire and PVM-100, have a tendency to underestimate the total liquid water in large drops or mixed phase clouds. The effective radius Re of the cloud droplets (XGRFF) is given by Re(um) = 30,000 x XGLWC(g/m^3)/XGSFC(cm^2/m^3). As the values of XGLWC and XGSFC approach zero the noise in the calculated values for Re will approach infinity given Re is the ratio of the two quantities. Thus to get all meaningful values of Re, a conditional statement should be applied to the ratio to avoid excessive noise. The recommended approach is to chose a limiting value of XGLWC below which no value of Re is calculated. With additional care in removing any remaining small offsets in the XGLWC and XGSFC data, the limiting value of XGLWC can be chosen as small as 0.010 g/m^3 for this data set. XGRFF was calculated with an XGLWC threshold of 0.05 and the additional condition that XGSFC>0 to avoid negative radius value.

Resource type

dataset

Resource locator

https://data.eol.ucar.edu/dataset/87.129

protocol: https

name: Gerber scientific (GSI) 1000-hz PVM homepage

description: Dataset homepage

https://data.eol.ucar.edu/cgi-bin/codiac/fgr_form/id=87.129

protocol: https

name: Gerber scientific (GSI) 1000-hz PVM Data Order Form

description: Dataset order request form. Data files are made available via FTP.

function: order

Unique resource identifier

code

87.129

codeSpace

Dataset language

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

climatologyMeteorologyAtmosphere

Keywords

Keyword set

keyword value

dataset

originating controlled vocabulary

title

Resource Type

reference date

date type

revision

effective date

2014-10-16

Keyword set

keyword value

NSF NCAR C-130

Keyword set

keyword value

Aircraft

Keyword set

keyword value

EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD MICROPHYSICS > CLOUD LIQUID WATER/ICE

EARTH SCIENCE > ATMOSPHERE > AEROSOLS > AEROSOL PARTICLE PROPERTIES

EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD MICROPHYSICS > CLOUD DROPLET CONCENTRATION/SIZE

originating controlled vocabulary

title

Global Change Master Directory (GCMD)

reference date

date type

revision

effective date

2018-02-27

Geographic location

West bounding longitude

-72.00000

East bounding longitude

-57.00000

North bounding latitude

21.00000

South bounding latitude

15.00000

Temporal reference

Temporal extent

Begin position

2004-11-24T00:00:00Z

End position

2005-01-24T23:59:00Z

Dataset reference date

date type

publication

effective date

2024-03-13T16:16:06Z

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

none

Limitations on public access

none

Responsible organisations

Responsible party

contact position

EOL Data Support

organisation name

UCAR/NCAR - Earth Observing Laboratory

full postal address

PO Box 3000

Boulder

80307-3000

email address

datahelp@eol.ucar.edu

web address

https://data.eol.ucar.edu/

name: homepage

responsible party role

pointOfContact

Responsible party

contact position

EOL Data Support

organisation name

UCAR/NCAR - Earth Observing Laboratory

full postal address

PO Box 3000

Boulder

80307-3000

email address

datahelp@eol.ucar.edu

web address

https://data.eol.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

contact position

EOL Data Support

organisation name

UCAR/NCAR - Earth Observing Laboratory

full postal address

PO Box 3000

Boulder

80307-3000

email address

datahelp@eol.ucar.edu

web address

https://data.eol.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata date

2024-12-26T23:52:07Z

Metadata language

eng; USA