ASDC | POLARIS_jValue_AircraftInSitu_ER2_Data

POLARIS Level 2

Entry Title: POLARIS Photolysis Frequencies (J-Values)

Entry ID: POLARIS_jValue_AircraftInSitu_ER2_Data_1

Clouds

Description

POLARIS_jValue_AircraftInSitu_ER2_Data is the photolysis frequencies (j-values) collected during the Photochemistry of Ozone Loss in the Arctic Region in Summer (POLARIS) campaign. Data from the the Composition and Photo-Dissociative Flux Measurement (CPFM) is featured in this collection. Data collection for this product is complete.

The POLARIS mission was a joint effort of NASA and NOAA that occurred in 1997 and was designed to expand on the photochemical and transport processes that cause the summer polar decreases in the stratospheric ozone. The POLARIS campaign had the overarching goal of better understanding the change of stratospheric ozone levels from very high concentrations in the spring to very low concentrations in the autumn. The NASA ER-2 high-altitude aircraft was the primary platform deployed along with balloons, satellites, and ground-sites. The POLARIS campaign was based in Fairbanks, Alaska with some flights being conducted from California and Hawaii. Flights were conducted between the summer solstice and fall equinox at mid- to high latitudes. The data collected included meteorological variables; long-lived tracers in reference to summertime transport questions; select species with reactive nitrogen (NOy), halogen (Cly), and hydrogen (HOx) reservoirs; and aerosols. More specifically, the ER-2 utilized various techniques/instruments including Laser Absorption, Gas Chromatography, Non-dispersive IR, UV Photometry, Catalysis, and IR Absorption. These techniques/instruments were used to collect data including N2O, CH4, CH3CCl3, CO2, O3, H2O, and NOy. Ground stations were responsible for collecting SO2 and O3, while balloons recorded pressure, temperature, wind speed, and wind directions. Satellites partnered with these platforms collected meteorological data and Lidar imagery. The observations were used to constrain stratospheric computer models to evaluate ozone changes due to chemistry and transport.

DOI

10.5067/ASDC/SUBORBITAL/POLARIS_jValue_AircraftInSitu_ER2_Data_1

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PUBLICATIONS

Preface [to special section on Photochemistry of Ozone Loss in the Arctic Region in Summer (POLARIS)]

From GCMD Science Keywords:

CLOUD FRACTION > CLOUD PROPERTIES
STATIC TEMPERATURE > SURFACE TEMPERATURE
OZONE PROFILES > ATMOSPHERIC OZONE > OXYGEN COMPOUNDS
CLOUD HEIGHT > CLOUD PROPERTIES
PHOTOLYSIS RATES > PHOTOCHEMISTRY
ATMOSPHERIC OZONE > OXYGEN COMPOUNDS
TERRAIN ELEVATION
CLOUD TOP PRESSURE > CLOUD PROPERTIES

Data Distribution

File Format(s):

AMES

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Spatial Information

Spatial Coverage: (S: -3.37, N: 90), (W: -180, E: 180)
Spatial Coverage Type: Horizontal Vertical
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

ARCTIC NORTHERN HEMISPHERE ALASKA

Temporal Information

Temporal Coverage: 1997-01-06 - 1997-09-26

Platforms

Jet

NASA ER-2

NASA Earth Resources-2

CPFM

Composition and Photodissociative Flux Measurement

Metadata Dates

Created on 2023-06-16

Last updated on 2024-09-03