ASDC | CAL_LID_L3_Tropospheric_APro

CALIPSO Level 3

Entry Title: CALIPSO Lidar Level 3 Tropospheric Aerosol Profiles, All Sky Data, Standard V4-20

Entry ID: CAL_LID_L3_Tropospheric_APro_AllSky-Standard-V4-20

Aerosols

Description

CAL_LID_L3_Tropospheric_APro_AllSky-Standard-V4-20 is the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Lidar Level 3 Tropospheric Aerosol Profiles, All Sky Data, Standard Version 4-20 data product. This data product was collected using the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument. Data generation and distribution of this V4.20 product ended on July 1, 2020, to support a change in the operating system of the CALIPSO production clusters. The V4.21 data product covers July 1, 2020, to current.

The CALIPSO lidar level 3 aerosol data product reports monthly mean profiles of aerosol optical properties on a uniform spatial grid. It is intended to be a tropospheric product, so data are only reported below altitudes of 12 km. All level 3 parameters are derived from the version 4.20 CALIOP level 2 aerosol profile product and have been quality screened before averaging. The primary quantities reported are vertical profiles of the aerosol extinction coefficient at 532 nm and its vertical integral, the aerosol optical depth (AOD). Aerosol type and spatial distribution information are also included. Averaged profile data is reported for all aerosols, regardless of type, and for mineral dust aerosols only. Classification of dust is based on the aerosol-type flags in the level 2 profile product. To keep level 3 file sizes manageable, four different types of level 3 files are produced, depending on the sky condition and the temporal coverage of the data prior to averaging.

Description of the Four Sky Conditions (Day, Night):

1) All Sky: All level 2 columns are averaged, regardless of cloud occurrence,

2) Cloud-Free: Only cloud-free level 2 columns are averaged,

3) Cloudy-Sky, Transparent: Only level 2 columns containing transparent clouds are averaged, and

4) Cloud-Sky, Opaque: Only level 2 columns containing opaque clouds are averaged

CALIPSO was launched on April 28, 2006, and continues to collect data necessary to study the impact of clouds and aerosols on the Earth's radiation budget and climate. It flies in the international A-Train constellation for coincident Earth observations. The CALIPSO satellite comprises three instruments: CALIOP, Imaging Infrared Radiometer (IIR), and Wide Field Camera (WFC). CALIPSO is a joint satellite mission between NASA and the French Agency CNES (Centre national d'études spatiales).

DOI

10.5067/CALIOP/CALIPSO/CAL_LID_L3_Tropospheric_APro_AllSky-Standard-V4-20

Citation Styles for this Dataset

Publications

Smith, Sarah Elise; Ting, Mingfang; Wu, Yutian; Zheng, Cheng (2022). Beyond the lockdowns: satellite observations of aerosol optical depth through 2020, the first year of the COVID-19 pandemic.

VIEW RELATED INFORMATION

ANOMALIES

CALIPSO Tilt Mode Geometry Anomaly

DATA CITATION POLICY

How to cite ASDC data

GENERAL DOCUMENTATION

HOW-TO

CALIPSO - Data User's Guide - Browse Image Tutorial

PROCESSING HISTORY

CALIPSO - Data Availability Site

PRODUCT USAGE

Overview of CALIPSO Data Product Maturity

PRODUCTION HISTORY

CALIPSO - Data Management System - Data Products Catalog - Release 2.4
CALIPSO Products Overview

PUBLICATIONS

CALIPSO: Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations Fact Sheet

USER FEEDBACK PAGE

CALIPSO Data User’s Guide - Frequently Asked Questions

USER'S GUIDE

CALIPSO Data User’s Guide

From GCMD Science Keywords:

AEROSOL EXTINCTION
AEROSOL OPTICAL DEPTH/THICKNESS

Column Aerosol Optical Depth
Aerosol Layer Properties
532nm Extinction Coefficient

Data Distribution

File Format(s):

HDF4

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Spatial Information

Spatial Coverage: (S: -90, N: 90), (W: -180, E: 180)
Spatial Coverage Type: Horizontal
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

GLOBAL TROPOSPHERE

Temporal Information

Temporal Coverage: 2006-06-01 - 2020-08-01

Platforms

Earth Observation Satellites

CALIPSO

Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations

CALIOP

Cloud-Aerosol Lidar with Orthogonal Polarization

Metadata Dates

Created on 2019-07-18

Last updated on 2023-09-27