ASDC | NVAP_WEATHER_Layered-Precipitable-Water

NVAP-M Level 3

Entry Title: NASA Water Vapor Project MEaSUREs (NVAP-M) WEATHER Layered Precipitable Water

Entry ID: NVAP_WEATHER_Layered-Precipitable-Water_1

Clouds MEaSUREs

Description

NVAP_WEATHER_Layered-Precipitable-Water data set is designed to provide higher spatial and temporal resolution products for use in studies on shorter time scales as well as weather case studies. Land GPS sites were added beginning in 1997. The new NVAP data sets are produced under the NASA Making Earth Science Data Records for Use in Research Environments (MEaSUREs) program and is named NVAP-M.

It supersedes the previous NVAP data set. NVAP-M continues the legacy of providing high-quality, model-independent global estimates of total column and layered water vapor. The use of improved, intercalibrated data sets and algorithms that were not available for the heritage NVAP data set results in an improved and extended water vapor data set that is stable enough for climate research and of a resolution appropriate for studies on smaller spatial and temporal scales. The true value of NVAP-M will be seen in outcomes from applied and research users of the data set in various fields. Some initial NVAP-M findings are presented in Vonder Haar et al. (2012). In addition to the time-dependent artifacts present in the previous NVAP data set, a wealth of new data has become available since the last NVAP processing in 2003. These include an additional SSM/I instrument, additional NOAA satellites, the NASA Earth Observing System (EOS)-Aqua Satellite, which carries the Atmospheric Infrared Sounder (AIRS), as well as water vapor information from Global Positioning System (GPS) satellites. This extension and reprocessing effort increases the temporal coverage from 14 to 22 (1988-2009) years, making the data set more useful and consistent for investigation of the long-term trends which are hypothesized to occur as Earth warms. In addition to the long-standing daily, 1-degree gridded Total Precipitable Water (TPW) and layered Precipitable Water (PW) products, NVAP-M includes additional products geared towards different scientific needs. Three separate processing streams produced products directed towards specific research goals. These are NVAP-M Climate, designed to provide the most stable water vapor data set over time for use in climate applications, and NVAP-M Weather, designed to provide higher spatial and temporal resolution products for use in studies on shorter time scales as well as weather case studies. Additionally, an ocean-only (NVAP-M Ocean) version includes only data from the SSM/I and is intended to mirror other available SSM/I-only water vapor data sets.

DOI

10.5067/NVAP-M/NVAP_WEATHER_LAYERED-PRECIPITABLE-WATER_L3.001

View Citations

Resources and Documentation

Earthdata Forum

VIEW RELATED INFORMATION

ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)

NASA Water Vapor Project – MEaSUREs (NVAP-M) Algorithm Theoretical Basis Document

DATA CITATION POLICY

How to cite ASDC data

GENERAL DOCUMENTATION

ASDC Data and Information for NVAP-M

HOW-TO

Readme to open and read NVAP-M data files

READ-ME

NVAP-MEaSUREs (NVAP-M) ReadMe

From GCMD Science Keywords:

WATER VAPOR INDICATORS
ATMOSPHERIC WATER VAPOR
LAYERED PRECIPITABLE WATER > WATER VAPOR INDICATORS

Daily Data
Grid Data
Number Size Distribution
Precipitable Water

Data Distribution

File Format(s):

NetCDF-3

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Spatial Information

Spatial Coverage: (-90, 90), (-179.9, 180)
Spatial Coverage Type: Not provided
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

GLOBAL

Temporal Information

Temporal Coverage: 1988-01-01 - 2009-12-01
Temporal Resolution: 6-Hourly

Platforms

Earth Observation Satellites

AQUA

Earth Observing System, AQUA

AIRS

Atmospheric Infrared Sounder

National Oceanic & Atmospheric Administration-17

HIRS

High Resolution Infrared Radiation Sounder

HIRS

High Resolution Infrared Radiation Sounder

HIRS

High Resolution Infrared Radiation Sounder

HIRS

High Resolution Infrared Radiation Sounder

HIRS

High Resolution Infrared Radiation Sounder

HIRS

High Resolution Infrared Radiation Sounder

HIRS

High Resolution Infrared Radiation Sounder

HIRS

High Resolution Infrared Radiation Sounder

In Situ Land-based Platforms

GROUND STATIONS

RADIOSONDES

IGRA radiosondes

Metadata Dates

Created on 2013-10-30

Last updated on 2019-11-18