ASDC | PACE-PAX_CIRPAS-Facility_AircraftInSitu_CIRPAS-TO_Data

PACE-PAX Level 2

Entry Title: PACE-PAX CIRPAS Twin Otter Facility Instrument Data

Entry ID: PACE-PAX_CIRPAS-Facility_AircraftInSitu_CIRPAS-TO_Data_1

Aerosols

Description

PACE-PAX_CIRPAS-Facility_AircraftInSitu_CIRPAS-TO_Data is the facility instrument data collected onboard the Twin Otter aircraft flying the CIRPAS suite of instruments during the Plankton, Aerosol, Cloud, ocean Ecosystem Postlaunch Airborne eXperiment (PACE-PAX) campaign. Data from the Cloud and Aerosol Spectrometer (CAS), Cloud Imaging Probe (CIP), and the Passive-Cavity Aerosol Spectrometer Probe (PCASP) instruments are featured in this collection. Data collection for this product is complete.

The PACE-PAX campaign was conducted in September 2024 to gather data for the validation and refinement of data products generated by the PACE satellite mission. PACE-PAX obtained measurements over Southern and Central California and nearby coastal regions. Scheduled for roughly 9 months after the launch of PACE, sixty flight hours were planned for each of the two aircraft, NASA’s ER-2 high-altitude aircraft, and the CIRPAS Twin Otter aircraft (in situ sampling). Based out of their respective home airports (NASA Armstrong Flight Research Center for the ER-2 and Marina Municipal Airport for the Twin Otter), flights were coordinated between the two aircraft, PACE satellite overpasses, and ground and ocean-based observations. With a robust suite of in situ and remote sensing instruments, and ground-based observations, PACE-PAX validated and refined PACE data products and identified any potential errors or biases in the measurements, which is essential for ensuring the accuracy and reliability of the PACE data products and maximizing the scientific value of the mission. The following were validation objectives for PACE-PAX: Validate new retrieval parameters; Assess spatial and temporal scale impact on validation; Validate within the instrument swath of all PACE instruments; Validate radiometric and polarimetric properties; Target specific geometries, season, and time of day; and focus on specific processes or phenomena (e.g., high-aerosol loads over land and ocean, multiple aerosol layers).

DOI

10.5067/ASDC/SUBORBITAL/PACE-PAX/CIRPAS-TO/CIRPAS-Facility_AircraftInsitu_1

Citation Styles for this Dataset

Resources and Documentation

Earthdata Forum

PROJECT HOME PAGE

PACE-PAX Project Home Page

PACE-PAX Home Page

PACE-PAX ESPO Home Page

PACE-PAX PICARD Data Access (LAADS)

VIEW RELATED INFORMATION

DATA CITATION GUIDELINES

How to Cite ASDC Data

PI DOCUMENTATION

PACE-PAX Meteorological Support

PUBLICATIONS

PACE-PAX White Paper

From GCMD Science Keywords:

AEROSOL PARTICLE PROPERTIES
WIND DIRECTION > SURFACE WINDS
POTENTIAL TEMPERATURE > SURFACE TEMPERATURE
WIND SPEED > SURFACE WINDS
WATER VAPOR MIXING RATIO PROFILES > WATER VAPOR PROFILES
AIRSPEED/GROUND SPEED
FLIGHT DATA LOGS
AEROSOL SIZE DISTRIBUTION > AEROSOL PARTICLE PROPERTIES
STATIC TEMPERATURE > SURFACE TEMPERATURE
RELATIVE HUMIDITY > HUMIDITY > WATER VAPOR INDICATORS

Data Distribution

File Format(s):

ICARTT

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Spatial Information

Spatial Coverage: (S: 33.49, N: 38.11), (W: -125.33, E: -116.98)
Spatial Coverage Type: Horizontal Vertical
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

CALIFORNIA NORTHERN HEMISPHERE WESTERN HEMISPHERE TROPOSPHERE

Temporal Information

Temporal Coverage: 2024-08-29 - 2024-09-28

Platforms

Propeller

TWIN OTTER CIRPAS NPS

CAS

Cloud and Aerosol Spectrometer

CIP

Cloud Imaging Probe

PCASP

Passive-Cavity Aerosol Spectrometer Probe

Metadata Dates

Last updated on 2025-09-08